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libopenshot/src/FFmpegWriter.cpp
Frank Dana d78ac099d6 CodeQL fixes, take 2 (#745) 
* Protect values against integer overflow

When the code multiplies integer values in an rvalue context before
it's stored in a larger type, the on-the-fly math is stored as int.
The value can overflow before it reaches the wider memory space.

To prevent this, we explicitly cast the result of the arithmetic
to the destination type.

Issues flagged by GitHub CodeQL.

* Apply these fixes correctly
2021-10-03 07:01:56 -04:00

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/**
* @file
* @brief Source file for FFmpegWriter class
* @author Jonathan Thomas <jonathan@openshot.org>, Fabrice Bellard
*
* @ref License
*/
/* LICENSE
*
* Copyright (c) 2008-2019 OpenShot Studios, LLC, Fabrice Bellard
* (http://www.openshotstudios.com). This file is part of
* OpenShot Library (http://www.openshot.org), an open-source project
* dedicated to delivering high quality video editing and animation solutions
* to the world.
*
* This file is originally based on the Libavformat API example, and then modified
* by the libopenshot project.
*
* OpenShot Library (libopenshot) is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* OpenShot Library (libopenshot) is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "FFmpegWriter.h"
#include "Exceptions.h"
#include <iostream>
using namespace openshot;
// Multiplexer parameters temporary storage
AVDictionary *mux_dict = NULL;
#if USE_HW_ACCEL
int hw_en_on = 1; // Is set in UI
int hw_en_supported = 0; // Is set by FFmpegWriter
AVPixelFormat hw_en_av_pix_fmt = AV_PIX_FMT_NONE;
AVHWDeviceType hw_en_av_device_type = AV_HWDEVICE_TYPE_VAAPI;
static AVBufferRef *hw_device_ctx = NULL;
AVFrame *hw_frame = NULL;
static int set_hwframe_ctx(AVCodecContext *ctx, AVBufferRef *hw_device_ctx, int64_t width, int64_t height)
{
AVBufferRef *hw_frames_ref;
AVHWFramesContext *frames_ctx = NULL;
int err = 0;
if (!(hw_frames_ref = av_hwframe_ctx_alloc(hw_device_ctx))) {
std::clog << "Failed to create HW frame context.\n";
return -1;
}
frames_ctx = (AVHWFramesContext *)(hw_frames_ref->data);
frames_ctx->format = hw_en_av_pix_fmt;
frames_ctx->sw_format = AV_PIX_FMT_NV12;
frames_ctx->width = width;
frames_ctx->height = height;
frames_ctx->initial_pool_size = 20;
if ((err = av_hwframe_ctx_init(hw_frames_ref)) < 0) {
std::clog << "Failed to initialize HW frame context. " <<
"Error code: " << av_err2string(err) << "\n";
av_buffer_unref(&hw_frames_ref);
return err;
}
ctx->hw_frames_ctx = av_buffer_ref(hw_frames_ref);
if (!ctx->hw_frames_ctx)
err = AVERROR(ENOMEM);
av_buffer_unref(&hw_frames_ref);
return err;
}
#endif // USE_HW_ACCEL
FFmpegWriter::FFmpegWriter(const std::string& path) :
path(path), fmt(NULL), oc(NULL), audio_st(NULL), video_st(NULL), samples(NULL),
audio_outbuf(NULL), audio_outbuf_size(0), audio_input_frame_size(0), audio_input_position(0),
initial_audio_input_frame_size(0), img_convert_ctx(NULL), cache_size(8), num_of_rescalers(32),
rescaler_position(0), video_codec_ctx(NULL), audio_codec_ctx(NULL), is_writing(false), video_timestamp(0), audio_timestamp(0),
original_sample_rate(0), original_channels(0), avr(NULL), avr_planar(NULL), is_open(false), prepare_streams(false),
write_header(false), write_trailer(false), audio_encoder_buffer_size(0), audio_encoder_buffer(NULL) {
// Disable audio & video (so they can be independently enabled)
info.has_audio = false;
info.has_video = false;
// Initialize FFMpeg, and register all formats and codecs
AV_REGISTER_ALL
// auto detect format
auto_detect_format();
}
// Open the writer
void FFmpegWriter::Open() {
if (!is_open) {
// Open the writer
is_open = true;
// Prepare streams (if needed)
if (!prepare_streams)
PrepareStreams();
// Now that all the parameters are set, we can open the audio and video codecs and allocate the necessary encode buffers
if (info.has_video && video_st)
open_video(oc, video_st);
if (info.has_audio && audio_st)
open_audio(oc, audio_st);
// Write header (if needed)
if (!write_header)
WriteHeader();
}
}
// auto detect format (from path)
void FFmpegWriter::auto_detect_format() {
// Auto detect the output format from the name. default is mpeg.
fmt = av_guess_format(NULL, path.c_str(), NULL);
if (!fmt)
throw InvalidFormat("Could not deduce output format from file extension.", path);
// Allocate the output media context
AV_OUTPUT_CONTEXT(&oc, path.c_str());
if (!oc)
throw OutOfMemory("Could not allocate memory for AVFormatContext.", path);
// Set the AVOutputFormat for the current AVFormatContext
oc->oformat = fmt;
// Update codec names
if (fmt->video_codec != AV_CODEC_ID_NONE && info.has_video)
// Update video codec name
info.vcodec = avcodec_find_encoder(fmt->video_codec)->name;
if (fmt->audio_codec != AV_CODEC_ID_NONE && info.has_audio)
// Update audio codec name
info.acodec = avcodec_find_encoder(fmt->audio_codec)->name;
}
// initialize streams
void FFmpegWriter::initialize_streams() {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::initialize_streams", "fmt->video_codec", fmt->video_codec, "fmt->audio_codec", fmt->audio_codec, "AV_CODEC_ID_NONE", AV_CODEC_ID_NONE);
// Add the audio and video streams using the default format codecs and initialize the codecs
video_st = NULL;
audio_st = NULL;
if (fmt->video_codec != AV_CODEC_ID_NONE && info.has_video)
// Add video stream
video_st = add_video_stream();
if (fmt->audio_codec != AV_CODEC_ID_NONE && info.has_audio)
// Add audio stream
audio_st = add_audio_stream();
}
// Set video export options
void FFmpegWriter::SetVideoOptions(bool has_video, std::string codec, Fraction fps, int width, int height, Fraction pixel_ratio, bool interlaced, bool top_field_first, int bit_rate) {
// Set the video options
if (codec.length() > 0) {
AVCodec *new_codec;
// Check if the codec selected is a hardware accelerated codec
#if USE_HW_ACCEL
#if defined(__linux__)
if (strstr(codec.c_str(), "_vaapi") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_VAAPI;
hw_en_av_device_type = AV_HWDEVICE_TYPE_VAAPI;
} else if (strstr(codec.c_str(), "_nvenc") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_CUDA;
hw_en_av_device_type = AV_HWDEVICE_TYPE_CUDA;
} else {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 0;
hw_en_supported = 0;
}
#elif defined(_WIN32)
if (strstr(codec.c_str(), "_dxva2") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_DXVA2_VLD;
hw_en_av_device_type = AV_HWDEVICE_TYPE_DXVA2;
} else if (strstr(codec.c_str(), "_nvenc") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_CUDA;
hw_en_av_device_type = AV_HWDEVICE_TYPE_CUDA;
} else {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 0;
hw_en_supported = 0;
}
#elif defined(__APPLE__)
if (strstr(codec.c_str(), "_videotoolbox") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_VIDEOTOOLBOX;
hw_en_av_device_type = AV_HWDEVICE_TYPE_VIDEOTOOLBOX;
} else {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 0;
hw_en_supported = 0;
}
#else // unknown OS
new_codec = avcodec_find_encoder_by_name(codec.c_str());
#endif //__linux__/_WIN32/__APPLE__
#else // USE_HW_ACCEL
new_codec = avcodec_find_encoder_by_name(codec.c_str());
#endif // USE_HW_ACCEL
if (new_codec == NULL)
throw InvalidCodec("A valid video codec could not be found for this file.", path);
else {
// Set video codec
info.vcodec = new_codec->name;
// Update video codec in fmt
fmt->video_codec = new_codec->id;
}
}
if (fps.num > 0) {
// Set frames per second (if provided)
info.fps.num = fps.num;
info.fps.den = fps.den;
// Set the timebase (inverse of fps)
info.video_timebase.num = info.fps.den;
info.video_timebase.den = info.fps.num;
}
if (width >= 1)
info.width = width;
if (height >= 1)
info.height = height;
if (pixel_ratio.num > 0) {
info.pixel_ratio.num = pixel_ratio.num;
info.pixel_ratio.den = pixel_ratio.den;
}
if (bit_rate >= 1000) // bit_rate is the bitrate in b/s
info.video_bit_rate = bit_rate;
if ((bit_rate >= 0) && (bit_rate < 256)) // bit_rate is the bitrate in crf
info.video_bit_rate = bit_rate;
info.interlaced_frame = interlaced;
info.top_field_first = top_field_first;
// Calculate the DAR (display aspect ratio)
Fraction size(info.width * info.pixel_ratio.num, info.height * info.pixel_ratio.den);
// Reduce size fraction
size.Reduce();
// Set the ratio based on the reduced fraction
info.display_ratio.num = size.num;
info.display_ratio.den = size.den;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::SetVideoOptions (" + codec + ")", "width", width, "height", height, "size.num", size.num, "size.den", size.den, "fps.num", fps.num, "fps.den", fps.den);
// Enable / Disable video
info.has_video = has_video;
}
// Set video export options (overloaded function)
void FFmpegWriter::SetVideoOptions(std::string codec, int width, int height, Fraction fps, int bit_rate) {
// Call full signature with some default parameters
FFmpegWriter::SetVideoOptions(
true, codec, fps, width, height,
openshot::Fraction(1, 1), false, true, bit_rate
);
}
// Set audio export options
void FFmpegWriter::SetAudioOptions(bool has_audio, std::string codec, int sample_rate, int channels, ChannelLayout channel_layout, int bit_rate) {
// Set audio options
if (codec.length() > 0) {
AVCodec *new_codec = avcodec_find_encoder_by_name(codec.c_str());
if (new_codec == NULL)
throw InvalidCodec("A valid audio codec could not be found for this file.", path);
else {
// Set audio codec
info.acodec = new_codec->name;
// Update audio codec in fmt
fmt->audio_codec = new_codec->id;
}
}
if (sample_rate > 7999)
info.sample_rate = sample_rate;
if (channels > 0)
info.channels = channels;
if (bit_rate > 999)
info.audio_bit_rate = bit_rate;
info.channel_layout = channel_layout;
// init resample options (if zero)
if (original_sample_rate == 0)
original_sample_rate = info.sample_rate;
if (original_channels == 0)
original_channels = info.channels;
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::SetAudioOptions (" + codec + ")",
"sample_rate", sample_rate,
"channels", channels,
"bit_rate", bit_rate);
// Enable / Disable audio
info.has_audio = has_audio;
}
// Set audio export options (overloaded function)
void FFmpegWriter::SetAudioOptions(std::string codec, int sample_rate, int bit_rate) {
// Call full signature with some default parameters
FFmpegWriter::SetAudioOptions(
true, codec, sample_rate, 2,
openshot::LAYOUT_STEREO, bit_rate
);
}
// Set custom options (some codecs accept additional params)
void FFmpegWriter::SetOption(StreamType stream, std::string name, std::string value) {
// Declare codec context
AVCodecContext *c = NULL;
AVStream *st = NULL;
std::stringstream convert(value);
if (info.has_video && stream == VIDEO_STREAM && video_st) {
st = video_st;
// Get codec context
c = AV_GET_CODEC_PAR_CONTEXT(st, video_codec_ctx);
// Was a codec / stream found?
if (c) {
if (info.interlaced_frame) {
c->field_order = info.top_field_first ? AV_FIELD_TT : AV_FIELD_BB;
// We only use these two version and ignore AV_FIELD_TB and AV_FIELD_BT
// Otherwise we would need to change the whole export window
}
}
} else if (info.has_audio && stream == AUDIO_STREAM && audio_st) {
st = audio_st;
// Get codec context
c = AV_GET_CODEC_PAR_CONTEXT(st, audio_codec_ctx);
} else
throw NoStreamsFound("The stream was not found. Be sure to call PrepareStreams() first.", path);
// Init AVOption
const AVOption *option = NULL;
// Was a codec / stream found?
if (c)
// Find AVOption (if it exists)
option = AV_OPTION_FIND(c->priv_data, name.c_str());
// Was option found?
if (option || (name == "g" || name == "qmin" || name == "qmax" || name == "max_b_frames" || name == "mb_decision" ||
name == "level" || name == "profile" || name == "slices" || name == "rc_min_rate" || name == "rc_max_rate" ||
name == "rc_buffer_size" || name == "crf" || name == "cqp" || name == "qp")) {
// Check for specific named options
if (name == "g")
// Set gop_size
convert >> c->gop_size;
else if (name == "qmin")
// Minimum quantizer
convert >> c->qmin;
else if (name == "qmax")
// Maximum quantizer
convert >> c->qmax;
else if (name == "max_b_frames")
// Maximum number of B-frames between non-B-frames
convert >> c->max_b_frames;
else if (name == "mb_decision")
// Macroblock decision mode
convert >> c->mb_decision;
else if (name == "level")
// Set codec level
convert >> c->level;
else if (name == "profile")
// Set codec profile
convert >> c->profile;
else if (name == "slices")
// Indicates number of picture subdivisions
convert >> c->slices;
else if (name == "rc_min_rate")
// Minimum bitrate
convert >> c->rc_min_rate;
else if (name == "rc_max_rate")
// Maximum bitrate
convert >> c->rc_max_rate;
else if (name == "rc_buffer_size")
// Buffer size
convert >> c->rc_buffer_size;
else if (name == "cqp") {
// encode quality and special settings like lossless
// This might be better in an extra methods as more options
// and way to set quality are possible
#if USE_HW_ACCEL
if (hw_en_on) {
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),63), 0); // 0-63
} else
#endif // USE_HW_ACCEL
{
switch (c->codec_id) {
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
case AV_CODEC_ID_AV1 :
c->bit_rate = 0;
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),63), 0); // 0-63
break;
#endif
case AV_CODEC_ID_VP8 :
c->bit_rate = 10000000;
av_opt_set_int(c->priv_data, "qp", std::max(std::min(std::stoi(value), 63), 4), 0); // 4-63
break;
case AV_CODEC_ID_VP9 :
c->bit_rate = 0; // Must be zero!
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 63), 0); // 0-63
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
case AV_CODEC_ID_H264 :
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 51), 0); // 0-51
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
c->pix_fmt = PIX_FMT_YUV444P; // no chroma subsampling
}
break;
case AV_CODEC_ID_HEVC :
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 51), 0); // 0-51
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
default:
// For all other codecs assume a range of 0-63
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 63), 0); // 0-63
c->bit_rate = 0;
}
}
} else if (name == "crf") {
// encode quality and special settings like lossless
// This might be better in an extra methods as more options
// and way to set quality are possible
#if USE_HW_ACCEL
if (hw_en_on) {
double mbs = 15000000.0;
if (info.video_bit_rate > 0) {
if (info.video_bit_rate > 42) {
mbs = 380000.0;
}
else {
mbs *= std::pow(0.912,info.video_bit_rate);
}
}
c->bit_rate = (int)(mbs);
} else
#endif // USE_HW_ACCEL
{
switch (c->codec_id) {
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
case AV_CODEC_ID_AV1 :
c->bit_rate = 0;
// AV1 only supports "crf" quality values
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value),63), 0);
break;
#endif
case AV_CODEC_ID_VP8 :
c->bit_rate = 10000000;
av_opt_set_int(c->priv_data, "crf", std::max(std::min(std::stoi(value), 63), 4), 0); // 4-63
break;
case AV_CODEC_ID_VP9 :
c->bit_rate = 0; // Must be zero!
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value), 63), 0); // 0-63
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
case AV_CODEC_ID_H264 :
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value), 51), 0); // 0-51
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
c->pix_fmt = PIX_FMT_YUV444P; // no chroma subsampling
}
break;
case AV_CODEC_ID_HEVC :
if (strstr(info.vcodec.c_str(), "svt_hevc") != NULL) {
av_opt_set_int(c->priv_data, "preset", 7, 0);
av_opt_set_int(c->priv_data, "forced-idr",1,0);
av_opt_set_int(c->priv_data, "qp",std::min(std::stoi(value), 51),0);
}
else {
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value), 51), 0); // 0-51
}
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
default:
// If this codec doesn't support crf calculate a bitrate
// TODO: find better formula
double mbs = 15000000.0;
if (info.video_bit_rate > 0) {
if (info.video_bit_rate > 42) {
mbs = 380000.0;
} else {
mbs *= std::pow(0.912, info.video_bit_rate);
}
}
c->bit_rate = (int) (mbs);
}
}
} else if (name == "qp") {
// encode quality and special settings like lossless
// This might be better in an extra methods as more options
// and way to set quality are possible
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
switch (c->codec_id) {
case AV_CODEC_ID_AV1 :
c->bit_rate = 0;
if (strstr(info.vcodec.c_str(), "svtav1") != NULL) {
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),63), 0);
}
else if (strstr(info.vcodec.c_str(), "rav1e") != NULL) {
// Set number of tiles to a fixed value
// TODO Let user choose number of tiles
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),255), 0);
}
else if (strstr(info.vcodec.c_str(), "aom") != NULL) {
// Set number of tiles to a fixed value
// TODO Let user choose number of tiles
// libaom doesn't have qp only crf
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value),63), 0);
}
else {
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value),63), 0);
}
case AV_CODEC_ID_HEVC :
c->bit_rate = 0;
if (strstr(info.vcodec.c_str(), "svt_hevc") != NULL) {
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),51), 0);
av_opt_set_int(c->priv_data, "preset", 7, 0);
av_opt_set_int(c->priv_data, "forced-idr",1,0);
}
break;
}
#endif // FFmpeg 4.0+
} else {
// Set AVOption
AV_OPTION_SET(st, c->priv_data, name.c_str(), value.c_str(), c);
}
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::SetOption (" + (std::string)name + ")", "stream == VIDEO_STREAM", stream == VIDEO_STREAM);
// Muxing dictionary is not part of the codec context.
// Just reusing SetOption function to set popular multiplexing presets.
} else if (name == "muxing_preset") {
if (value == "mp4_faststart") {
// 'moov' box to the beginning; only for MOV, MP4
av_dict_set(&mux_dict, "movflags", "faststart", 0);
} else if (value == "mp4_fragmented") {
// write selfcontained fragmented file, minimum length of the fragment 8 sec; only for MOV, MP4
av_dict_set(&mux_dict, "movflags", "frag_keyframe", 0);
av_dict_set(&mux_dict, "min_frag_duration", "8000000", 0);
}
} else {
throw InvalidOptions("The option is not valid for this codec.", path);
}
}
/// Determine if codec name is valid
bool FFmpegWriter::IsValidCodec(std::string codec_name) {
// Initialize FFMpeg, and register all formats and codecs
AV_REGISTER_ALL
// Find the codec (if any)
if (avcodec_find_encoder_by_name(codec_name.c_str()) == NULL)
return false;
else
return true;
}
// Prepare & initialize streams and open codecs
void FFmpegWriter::PrepareStreams() {
if (!info.has_audio && !info.has_video)
throw InvalidOptions("No video or audio options have been set. You must set has_video or has_audio (or both).", path);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::PrepareStreams [" + path + "]", "info.has_audio", info.has_audio, "info.has_video", info.has_video);
// Initialize the streams (i.e. add the streams)
initialize_streams();
// Mark as 'prepared'
prepare_streams = true;
}
// Write the file header (after the options are set)
void FFmpegWriter::WriteHeader() {
if (!info.has_audio && !info.has_video)
throw InvalidOptions("No video or audio options have been set. You must set has_video or has_audio (or both).", path);
// Open the output file, if needed
if (!(fmt->flags & AVFMT_NOFILE)) {
if (avio_open(&oc->pb, path.c_str(), AVIO_FLAG_WRITE) < 0)
throw InvalidFile("Could not open or write file.", path);
}
// Force the output filename (which doesn't always happen for some reason)
AV_SET_FILENAME(oc, path.c_str());
// Add general metadata (if any)
for (std::map<std::string, std::string>::iterator iter = info.metadata.begin(); iter != info.metadata.end(); ++iter) {
av_dict_set(&oc->metadata, iter->first.c_str(), iter->second.c_str(), 0);
}
// Set multiplexing parameters
AVDictionary *dict = NULL;
bool is_mp4 = strcmp(oc->oformat->name, "mp4");
bool is_mov = strcmp(oc->oformat->name, "mov");
// Set dictionary preset only for MP4 and MOV files
if (is_mp4 || is_mov)
av_dict_copy(&dict, mux_dict, 0);
// Write the stream header
if (avformat_write_header(oc, &dict) != 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteHeader (avformat_write_header)");
throw InvalidFile("Could not write header to file.", path);
};
// Free multiplexing dictionaries sets
if (dict) av_dict_free(&dict);
if (mux_dict) av_dict_free(&mux_dict);
// Mark as 'written'
write_header = true;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteHeader");
}
// Add a frame to the queue waiting to be encoded.
void FFmpegWriter::WriteFrame(std::shared_ptr<Frame> frame) {
// Check for open reader (or throw exception)
if (!is_open)
throw WriterClosed("The FFmpegWriter is closed. Call Open() before calling this method.", path);
// Add frame pointer to "queue", waiting to be processed the next
// time the WriteFrames() method is called.
if (info.has_video && video_st)
spooled_video_frames.push_back(frame);
if (info.has_audio && audio_st)
spooled_audio_frames.push_back(frame);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteFrame", "frame->number", frame->number, "spooled_video_frames.size()", spooled_video_frames.size(), "spooled_audio_frames.size()", spooled_audio_frames.size(), "cache_size", cache_size, "is_writing", is_writing);
// Write the frames once it reaches the correct cache size
if ((int)spooled_video_frames.size() == cache_size || (int)spooled_audio_frames.size() == cache_size) {
// Write frames to video file
write_queued_frames();
}
// Keep track of the last frame added
last_frame = frame;
}
// Write all frames in the queue to the video file.
void FFmpegWriter::write_queued_frames() {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_queued_frames", "spooled_video_frames.size()", spooled_video_frames.size(), "spooled_audio_frames.size()", spooled_audio_frames.size());
// Flip writing flag
is_writing = true;
// Transfer spool to queue
queued_video_frames = spooled_video_frames;
queued_audio_frames = spooled_audio_frames;
// Empty spool
spooled_video_frames.clear();
spooled_audio_frames.clear();
// Create blank exception
bool has_error_encoding_video = false;
// Process all audio frames (in a separate thread)
if (info.has_audio && audio_st && !queued_audio_frames.empty())
write_audio_packets(false);
// Loop through each queued image frame
while (!queued_video_frames.empty()) {
// Get front frame (from the queue)
std::shared_ptr<Frame> frame = queued_video_frames.front();
// Add to processed queue
processed_frames.push_back(frame);
// Encode and add the frame to the output file
if (info.has_video && video_st)
process_video_packet(frame);
// Remove front item
queued_video_frames.pop_front();
} // end while
// Loop back through the frames (in order), and write them to the video file
while (!processed_frames.empty()) {
// Get front frame (from the queue)
std::shared_ptr<Frame> frame = processed_frames.front();
if (info.has_video && video_st) {
// Add to deallocate queue (so we can remove the AVFrames when we are done)
deallocate_frames.push_back(frame);
// Does this frame's AVFrame still exist
if (av_frames.count(frame)) {
// Get AVFrame
AVFrame *frame_final = av_frames[frame];
// Write frame to video file
bool success = write_video_packet(frame, frame_final);
if (!success)
has_error_encoding_video = true;
}
}
// Remove front item
processed_frames.pop_front();
}
// Loop through, and deallocate AVFrames
while (!deallocate_frames.empty()) {
// Get front frame (from the queue)
std::shared_ptr<Frame> frame = deallocate_frames.front();
// Does this frame's AVFrame still exist
if (av_frames.count(frame)) {
// Get AVFrame
AVFrame *av_frame = av_frames[frame];
// Deallocate AVPicture and AVFrame
av_freep(&(av_frame->data[0]));
AV_FREE_FRAME(&av_frame);
av_frames.erase(frame);
}
// Remove front item
deallocate_frames.pop_front();
}
// Done writing
is_writing = false;
// Raise exception from main thread
if (has_error_encoding_video)
throw ErrorEncodingVideo("Error while writing raw video frame", -1);
}
// Write a block of frames from a reader
void FFmpegWriter::WriteFrame(ReaderBase *reader, int64_t start, int64_t length) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteFrame (from Reader)", "start", start, "length", length);
// Loop through each frame (and encoded it)
for (int64_t number = start; number <= length; number++) {
// Get the frame
std::shared_ptr<Frame> f = reader->GetFrame(number);
// Encode frame
WriteFrame(f);
}
}
// Write the file trailer (after all frames are written)
void FFmpegWriter::WriteTrailer() {
// Write any remaining queued frames to video file
write_queued_frames();
// Process final audio frame (if any)
if (info.has_audio && audio_st)
write_audio_packets(true);
// Flush encoders (who sometimes hold on to frames)
flush_encoders();
/* write the trailer, if any. The trailer must be written
* before you close the CodecContexts open when you wrote the
* header; otherwise write_trailer may try to use memory that
* was freed on av_codec_close() */
av_write_trailer(oc);
// Mark as 'written'
write_trailer = true;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteTrailer");
}
// Flush encoders
void FFmpegWriter::flush_encoders() {
if (info.has_audio && audio_codec_ctx && AV_GET_CODEC_TYPE(audio_st) == AVMEDIA_TYPE_AUDIO && AV_GET_CODEC_ATTRIBUTES(audio_st, audio_codec_ctx)->frame_size <= 1)
return;
#if (LIBAVFORMAT_VERSION_MAJOR < 58)
// FFmpeg < 4.0
if (info.has_video && video_codec_ctx && AV_GET_CODEC_TYPE(video_st) == AVMEDIA_TYPE_VIDEO && (oc->oformat->flags & AVFMT_RAWPICTURE) && AV_FIND_DECODER_CODEC_ID(video_st) == AV_CODEC_ID_RAWVIDEO)
return;
#else
if (info.has_video && video_codec_ctx && AV_GET_CODEC_TYPE(video_st) == AVMEDIA_TYPE_VIDEO && AV_FIND_DECODER_CODEC_ID(video_st) == AV_CODEC_ID_RAWVIDEO)
return;
#endif
// FLUSH VIDEO ENCODER
if (info.has_video)
for (;;) {
// Increment PTS (in frames and scaled to the codec's timebase)
video_timestamp += av_rescale_q(1, av_make_q(info.fps.den, info.fps.num), video_codec_ctx->time_base);
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
/* encode the image */
int got_packet = 0;
int error_code = 0;
#if IS_FFMPEG_3_2
// Encode video packet (latest version of FFmpeg)
error_code = avcodec_send_frame(video_codec_ctx, NULL);
got_packet = 0;
while (error_code >= 0) {
error_code = avcodec_receive_packet(video_codec_ctx, &pkt);
if (error_code == AVERROR(EAGAIN)|| error_code == AVERROR_EOF) {
got_packet = 0;
// Write packet
avcodec_flush_buffers(video_codec_ctx);
break;
}
av_packet_rescale_ts(&pkt, video_codec_ctx->time_base, video_st->time_base);
pkt.stream_index = video_st->index;
error_code = av_interleaved_write_frame(oc, &pkt);
}
#else // IS_FFMPEG_3_2
// Encode video packet (older than FFmpeg 3.2)
error_code = avcodec_encode_video2(video_codec_ctx, &pkt, NULL, &got_packet);
#endif // IS_FFMPEG_3_2
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::flush_encoders ERROR [" + av_err2string(error_code) + "]", "error_code", error_code);
}
if (!got_packet) {
break;
}
// set the timestamp
av_packet_rescale_ts(&pkt, video_codec_ctx->time_base, video_st->time_base);
pkt.stream_index = video_st->index;
// Write packet
error_code = av_interleaved_write_frame(oc, &pkt);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::flush_encoders ERROR [" + av_err2string(error_code) + "]", "error_code", error_code);
}
}
// FLUSH AUDIO ENCODER
if (info.has_audio) {
for (;;) {
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
pkt.pts = pkt.dts = audio_timestamp;
/* encode the image */
int error_code = 0;
int got_packet = 0;
#if IS_FFMPEG_3_2
error_code = avcodec_send_frame(audio_codec_ctx, NULL);
#else
error_code = avcodec_encode_audio2(audio_codec_ctx, &pkt, NULL, &got_packet);
#endif
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::flush_encoders ERROR [" + av_err2string(error_code) + "]",
"error_code", error_code);
}
if (!got_packet) {
break;
}
// Since the PTS can change during encoding, set the value again. This seems like a huge hack,
// but it fixes lots of PTS related issues when I do this.
pkt.pts = pkt.dts = audio_timestamp;
// Scale the PTS to the audio stream timebase (which is sometimes different than the codec's timebase)
av_packet_rescale_ts(&pkt, audio_codec_ctx->time_base, audio_st->time_base);
// set stream
pkt.stream_index = audio_st->index;
pkt.flags |= AV_PKT_FLAG_KEY;
// Write packet
error_code = av_interleaved_write_frame(oc, &pkt);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::flush_encoders ERROR [" + av_err2string(error_code) + "]",
"error_code", error_code);
}
// Increment PTS by duration of packet
audio_timestamp += pkt.duration;
// deallocate memory for packet
AV_FREE_PACKET(&pkt);
}
}
}
// Close the video codec
void FFmpegWriter::close_video(AVFormatContext *oc, AVStream *st)
{
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
if (hw_device_ctx) {
av_buffer_unref(&hw_device_ctx);
hw_device_ctx = NULL;
}
}
#endif // USE_HW_ACCEL
}
// Close the audio codec
void FFmpegWriter::close_audio(AVFormatContext *oc, AVStream *st)
{
// Clear buffers
delete[] samples;
delete[] audio_outbuf;
delete[] audio_encoder_buffer;
samples = NULL;
audio_outbuf = NULL;
audio_encoder_buffer = NULL;
// Deallocate resample buffer
if (avr) {
SWR_CLOSE(avr);
SWR_FREE(&avr);
avr = NULL;
}
if (avr_planar) {
SWR_CLOSE(avr_planar);
SWR_FREE(&avr_planar);
avr_planar = NULL;
}
}
// Close the writer
void FFmpegWriter::Close() {
// Write trailer (if needed)
if (!write_trailer)
WriteTrailer();
// Close each codec
if (video_st)
close_video(oc, video_st);
if (audio_st)
close_audio(oc, audio_st);
// Deallocate image scalers
if (image_rescalers.size() > 0)
RemoveScalers();
if (!(fmt->flags & AVFMT_NOFILE)) {
/* close the output file */
avio_close(oc->pb);
}
// Reset frame counters
video_timestamp = 0;
audio_timestamp = 0;
// Free the context which frees the streams too
avformat_free_context(oc);
oc = NULL;
// Close writer
is_open = false;
prepare_streams = false;
write_header = false;
write_trailer = false;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::Close");
}
// Add an AVFrame to the cache
void FFmpegWriter::add_avframe(std::shared_ptr<Frame> frame, AVFrame *av_frame) {
// Add AVFrame to map (if it does not already exist)
if (!av_frames.count(frame)) {
// Add av_frame
av_frames[frame] = av_frame;
} else {
// Do not add, and deallocate this AVFrame
AV_FREE_FRAME(&av_frame);
}
}
// Add an audio output stream
AVStream *FFmpegWriter::add_audio_stream() {
AVCodecContext *c;
AVStream *st;
// Find the audio codec
AVCodec *codec = avcodec_find_encoder_by_name(info.acodec.c_str());
if (codec == NULL)
throw InvalidCodec("A valid audio codec could not be found for this file.", path);
// Free any previous memory allocations
if (audio_codec_ctx != NULL) {
AV_FREE_CONTEXT(audio_codec_ctx);
}
// Create a new audio stream
AV_FORMAT_NEW_STREAM(oc, audio_codec_ctx, codec, st)
c->codec_id = codec->id;
c->codec_type = AVMEDIA_TYPE_AUDIO;
// Set the sample parameters
c->bit_rate = info.audio_bit_rate;
c->channels = info.channels;
// Set valid sample rate (or throw error)
if (codec->supported_samplerates) {
int i;
for (i = 0; codec->supported_samplerates[i] != 0; i++)
if (info.sample_rate == codec->supported_samplerates[i]) {
// Set the valid sample rate
c->sample_rate = info.sample_rate;
break;
}
if (codec->supported_samplerates[i] == 0)
throw InvalidSampleRate("An invalid sample rate was detected for this codec.", path);
} else
// Set sample rate
c->sample_rate = info.sample_rate;
// Set a valid number of channels (or throw error)
const uint64_t channel_layout = info.channel_layout;
if (codec->channel_layouts) {
int i;
for (i = 0; codec->channel_layouts[i] != 0; i++)
if (channel_layout == codec->channel_layouts[i]) {
// Set valid channel layout
c->channel_layout = channel_layout;
break;
}
if (codec->channel_layouts[i] == 0)
throw InvalidChannels("An invalid channel layout was detected (i.e. MONO / STEREO).", path);
} else
// Set valid channel layout
c->channel_layout = channel_layout;
// Choose a valid sample_fmt
if (codec->sample_fmts) {
for (int i = 0; codec->sample_fmts[i] != AV_SAMPLE_FMT_NONE; i++) {
// Set sample format to 1st valid format (and then exit loop)
c->sample_fmt = codec->sample_fmts[i];
break;
}
}
if (c->sample_fmt == AV_SAMPLE_FMT_NONE) {
// Default if no sample formats found
c->sample_fmt = AV_SAMPLE_FMT_S16;
}
// some formats want stream headers to be separate
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
#if (LIBAVCODEC_VERSION_MAJOR >= 57)
// FFmpeg 3.0+
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
#else
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
#endif
AV_COPY_PARAMS_FROM_CONTEXT(st, c);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::add_audio_stream", "c->codec_id", c->codec_id, "c->bit_rate", c->bit_rate, "c->channels", c->channels, "c->sample_fmt", c->sample_fmt, "c->channel_layout", c->channel_layout, "c->sample_rate", c->sample_rate);
return st;
}
// Add a video output stream
AVStream *FFmpegWriter::add_video_stream() {
AVCodecContext *c;
AVStream *st;
// Find the video codec
AVCodec *codec = avcodec_find_encoder_by_name(info.vcodec.c_str());
if (codec == NULL)
throw InvalidCodec("A valid video codec could not be found for this file.", path);
// Create a new video stream
AV_FORMAT_NEW_STREAM(oc, video_codec_ctx, codec, st)
c->codec_id = codec->id;
c->codec_type = AVMEDIA_TYPE_VIDEO;
/* Init video encoder options */
if (info.video_bit_rate >= 1000
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
&& c->codec_id != AV_CODEC_ID_AV1
#endif
) {
c->bit_rate = info.video_bit_rate;
if (info.video_bit_rate >= 1500000) {
if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
c->qmin = 2;
c->qmax = 30;
}
}
// Here should be the setting for low fixed bitrate
// Defaults are used because mpeg2 otherwise had problems
} else {
// Check if codec supports crf or qp
switch (c->codec_id) {
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
case AV_CODEC_ID_AV1 :
// TODO: Set `crf` or `qp` according to bitrate, as bitrate is not supported by these encoders yet.
if (info.video_bit_rate >= 1000) {
c->bit_rate = 0;
if (strstr(info.vcodec.c_str(), "aom") != NULL) {
int calculated_quality = 35;
if (info.video_bit_rate < 500000) calculated_quality = 50;
if (info.video_bit_rate > 5000000) calculated_quality = 10;
av_opt_set_int(c->priv_data, "crf", calculated_quality, 0);
info.video_bit_rate = calculated_quality;
} else {
int calculated_quality = 50;
if (info.video_bit_rate < 500000) calculated_quality = 60;
if (info.video_bit_rate > 5000000) calculated_quality = 15;
av_opt_set_int(c->priv_data, "qp", calculated_quality, 0);
info.video_bit_rate = calculated_quality;
} // medium
}
if (strstr(info.vcodec.c_str(), "svtav1") != NULL) {
av_opt_set_int(c->priv_data, "preset", 6, 0);
av_opt_set_int(c->priv_data, "forced-idr",1,0);
}
else if (strstr(info.vcodec.c_str(), "rav1e") != NULL) {
av_opt_set_int(c->priv_data, "speed", 7, 0);
av_opt_set_int(c->priv_data, "tile-rows", 2, 0);
av_opt_set_int(c->priv_data, "tile-columns", 4, 0);
}
else if (strstr(info.vcodec.c_str(), "aom") != NULL) {
// Set number of tiles to a fixed value
// TODO: Allow user to chose their own number of tiles
av_opt_set_int(c->priv_data, "tile-rows", 1, 0); // log2 of number of rows
av_opt_set_int(c->priv_data, "tile-columns", 2, 0); // log2 of number of columns
av_opt_set_int(c->priv_data, "row-mt", 1, 0); // use multiple cores
av_opt_set_int(c->priv_data, "cpu-used", 3, 0); // default is 1, usable is 4
}
//break;
#endif
case AV_CODEC_ID_VP9 :
case AV_CODEC_ID_HEVC :
case AV_CODEC_ID_VP8 :
case AV_CODEC_ID_H264 :
if (info.video_bit_rate < 40) {
c->qmin = 0;
c->qmax = 63;
} else {
c->qmin = info.video_bit_rate - 5;
c->qmax = 63;
}
break;
default:
// Here should be the setting for codecs that don't support crf
// For now defaults are used
break;
}
}
//TODO: Implement variable bitrate feature (which actually works). This implementation throws
//invalid bitrate errors and rc buffer underflow errors, etc...
//c->rc_min_rate = info.video_bit_rate;
//c->rc_max_rate = info.video_bit_rate;
//c->rc_buffer_size = FFMAX(c->rc_max_rate, 15000000) * 112L / 15000000 * 16384;
//if ( !c->rc_initial_buffer_occupancy )
// c->rc_initial_buffer_occupancy = c->rc_buffer_size * 3/4;
/* resolution must be a multiple of two */
// TODO: require /2 height and width
c->width = info.width;
c->height = info.height;
/* time base: this is the fundamental unit of time (in seconds) in terms
of which frame timestamps are represented. for fixed-fps content,
timebase should be 1/framerate and timestamp increments should be
identically 1. */
c->time_base.num = info.video_timebase.num;
c->time_base.den = info.video_timebase.den;
// AVCodecContext->framerate was added in FFmpeg 2.6
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(56, 26, 0)
c->framerate = av_inv_q(c->time_base);
#endif
st->avg_frame_rate = av_inv_q(c->time_base);
st->time_base.num = info.video_timebase.num;
st->time_base.den = info.video_timebase.den;
#if (LIBAVFORMAT_VERSION_MAJOR >= 58)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
st->codec->time_base.num = info.video_timebase.num;
st->codec->time_base.den = info.video_timebase.den;
#pragma GCC diagnostic pop
#endif
c->gop_size = 12; /* TODO: add this to "info"... emit one intra frame every twelve frames at most */
c->max_b_frames = 10;
if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO)
/* just for testing, we also add B frames */
c->max_b_frames = 2;
if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO)
/* Needed to avoid using macroblocks in which some coeffs overflow.
This does not happen with normal video, it just happens here as
the motion of the chroma plane does not match the luma plane. */
c->mb_decision = 2;
// some formats want stream headers to be separate
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
#if (LIBAVCODEC_VERSION_MAJOR >= 57)
// FFmpeg 3.0+
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
#else
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
#endif
// Find all supported pixel formats for this codec
const PixelFormat *supported_pixel_formats = codec->pix_fmts;
while (supported_pixel_formats != NULL && *supported_pixel_formats != PIX_FMT_NONE) {
// Assign the 1st valid pixel format (if one is missing)
if (c->pix_fmt == PIX_FMT_NONE)
c->pix_fmt = *supported_pixel_formats;
++supported_pixel_formats;
}
// Codec doesn't have any pix formats?
if (c->pix_fmt == PIX_FMT_NONE) {
if (fmt->video_codec == AV_CODEC_ID_RAWVIDEO) {
// Raw video should use RGB24
c->pix_fmt = PIX_FMT_RGB24;
#if (LIBAVFORMAT_VERSION_MAJOR < 58)
// FFmpeg < 4.0
if (strcmp(fmt->name, "gif") != 0)
// If not GIF format, skip the encoding process
// Set raw picture flag (so we don't encode this video)
oc->oformat->flags |= AVFMT_RAWPICTURE;
#endif
} else {
// Set the default codec
c->pix_fmt = PIX_FMT_YUV420P;
}
}
AV_COPY_PARAMS_FROM_CONTEXT(st, c);
#if (LIBAVFORMAT_VERSION_MAJOR < 58)
// FFmpeg < 4.0
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::add_video_stream (" + (std::string)fmt->name + " : " + (std::string)av_get_pix_fmt_name(c->pix_fmt) + ")", "c->codec_id", c->codec_id, "c->bit_rate", c->bit_rate, "c->pix_fmt", c->pix_fmt, "oc->oformat->flags", oc->oformat->flags, "AVFMT_RAWPICTURE", AVFMT_RAWPICTURE);
#else
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::add_video_stream (" + (std::string)fmt->name + " : " + (std::string)av_get_pix_fmt_name(c->pix_fmt) + ")", "c->codec_id", c->codec_id, "c->bit_rate", c->bit_rate, "c->pix_fmt", c->pix_fmt, "oc->oformat->flags", oc->oformat->flags);
#endif
return st;
}
// open audio codec
void FFmpegWriter::open_audio(AVFormatContext *oc, AVStream *st) {
AVCodec *codec;
AV_GET_CODEC_FROM_STREAM(st, audio_codec_ctx)
// Set number of threads equal to number of processors (not to exceed 16)
audio_codec_ctx->thread_count = std::min(FF_NUM_PROCESSORS, 16);
// Find the audio encoder
codec = avcodec_find_encoder_by_name(info.acodec.c_str());
if (!codec)
codec = avcodec_find_encoder(audio_codec_ctx->codec_id);
if (!codec)
throw InvalidCodec("Could not find codec", path);
// Init options
AVDictionary *opts = NULL;
av_dict_set(&opts, "strict", "experimental", 0);
// Open the codec
if (avcodec_open2(audio_codec_ctx, codec, &opts) < 0)
throw InvalidCodec("Could not open audio codec", path);
AV_COPY_PARAMS_FROM_CONTEXT(st, audio_codec_ctx);
// Free options
av_dict_free(&opts);
// Calculate the size of the input frame (i..e how many samples per packet), and the output buffer
// TODO: Ugly hack for PCM codecs (will be removed ASAP with new PCM support to compute the input frame size in samples
if (audio_codec_ctx->frame_size <= 1) {
// No frame size found... so calculate
audio_input_frame_size = 50000 / info.channels;
int s = AV_FIND_DECODER_CODEC_ID(st);
switch (s) {
case AV_CODEC_ID_PCM_S16LE:
case AV_CODEC_ID_PCM_S16BE:
case AV_CODEC_ID_PCM_U16LE:
case AV_CODEC_ID_PCM_U16BE:
audio_input_frame_size >>= 1;
break;
default:
break;
}
} else {
// Set frame size based on the codec
audio_input_frame_size = audio_codec_ctx->frame_size;
}
// Set the initial frame size (since it might change during resampling)
initial_audio_input_frame_size = audio_input_frame_size;
// Allocate array for samples
samples = new int16_t[AVCODEC_MAX_AUDIO_FRAME_SIZE];
// Set audio output buffer (used to store the encoded audio)
audio_outbuf_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
audio_outbuf = new uint8_t[audio_outbuf_size];
// Set audio packet encoding buffer
audio_encoder_buffer_size = AUDIO_PACKET_ENCODING_SIZE;
audio_encoder_buffer = new uint8_t[audio_encoder_buffer_size];
// Add audio metadata (if any)
for (std::map<std::string, std::string>::iterator iter = info.metadata.begin(); iter != info.metadata.end(); ++iter) {
av_dict_set(&st->metadata, iter->first.c_str(), iter->second.c_str(), 0);
}
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::open_audio", "audio_codec_ctx->thread_count", audio_codec_ctx->thread_count, "audio_input_frame_size", audio_input_frame_size, "buffer_size", AVCODEC_MAX_AUDIO_FRAME_SIZE + MY_INPUT_BUFFER_PADDING_SIZE);
}
// open video codec
void FFmpegWriter::open_video(AVFormatContext *oc, AVStream *st) {
AVCodec *codec;
AV_GET_CODEC_FROM_STREAM(st, video_codec_ctx)
// Set number of threads equal to number of processors (not to exceed 16)
video_codec_ctx->thread_count = std::min(FF_NUM_PROCESSORS, 16);
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
//char *dev_hw = NULL;
char adapter[256];
char *adapter_ptr = NULL;
int adapter_num;
// Use the hw device given in the environment variable HW_EN_DEVICE_SET or the default if not set
adapter_num = openshot::Settings::Instance()->HW_EN_DEVICE_SET;
std::clog << "Encoding Device Nr: " << adapter_num << "\n";
if (adapter_num < 3 && adapter_num >=0) {
#if defined(__linux__)
snprintf(adapter,sizeof(adapter),"/dev/dri/renderD%d", adapter_num+128);
// Maybe 127 is better because the first card would be 1?!
adapter_ptr = adapter;
#elif defined(_WIN32) || defined(__APPLE__)
adapter_ptr = NULL;
#endif
}
else {
adapter_ptr = NULL; // Just to be sure
}
// Check if it is there and writable
#if defined(__linux__)
if( adapter_ptr != NULL && access( adapter_ptr, W_OK ) == 0 ) {
#elif defined(_WIN32) || defined(__APPLE__)
if( adapter_ptr != NULL ) {
#endif
ZmqLogger::Instance()->AppendDebugMethod("Encode Device present using device", "adapter", adapter_num);
}
else {
adapter_ptr = NULL; // use default
ZmqLogger::Instance()->AppendDebugMethod("Encode Device not present, using default");
}
if (av_hwdevice_ctx_create(&hw_device_ctx, hw_en_av_device_type,
adapter_ptr, NULL, 0) < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::open_video ERROR creating hwdevice, Codec name:", info.vcodec.c_str(), -1);
throw InvalidCodec("Could not create hwdevice", path);
}
}
#endif // USE_HW_ACCEL
/* find the video encoder */
codec = avcodec_find_encoder_by_name(info.vcodec.c_str());
if (!codec)
codec = avcodec_find_encoder(AV_FIND_DECODER_CODEC_ID(st));
if (!codec)
throw InvalidCodec("Could not find codec", path);
/* Force max_b_frames to 0 in some cases (i.e. for mjpeg image sequences */
if (video_codec_ctx->max_b_frames && video_codec_ctx->codec_id != AV_CODEC_ID_MPEG4 && video_codec_ctx->codec_id != AV_CODEC_ID_MPEG1VIDEO && video_codec_ctx->codec_id != AV_CODEC_ID_MPEG2VIDEO)
video_codec_ctx->max_b_frames = 0;
// Init options
AVDictionary *opts = NULL;
av_dict_set(&opts, "strict", "experimental", 0);
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
video_codec_ctx->pix_fmt = hw_en_av_pix_fmt;
// for the list of possible options, see the list of codec-specific options:
// e.g. ffmpeg -h encoder=h264_vaapi or ffmpeg -h encoder=hevc_vaapi
// and "man ffmpeg-codecs"
// For VAAPI, it is safer to explicitly set rc_mode instead of relying on auto-selection
// which is ffmpeg version-specific.
if (hw_en_av_pix_fmt == AV_PIX_FMT_VAAPI) {
int64_t qp;
if (av_opt_get_int(video_codec_ctx->priv_data, "qp", 0, &qp) != 0 || qp == 0) {
// unless "qp" was set for CQP, switch to VBR RC mode
av_opt_set(video_codec_ctx->priv_data, "rc_mode", "VBR", 0);
// In the current state (ffmpeg-4.2-4 libva-mesa-driver-19.1.5-1) to use VBR,
// one has to specify both bit_rate and maxrate, otherwise a small low quality file is generated on Intel iGPU).
video_codec_ctx->rc_max_rate = video_codec_ctx->bit_rate;
}
}
switch (video_codec_ctx->codec_id) {
case AV_CODEC_ID_H264:
video_codec_ctx->max_b_frames = 0; // At least this GPU doesn't support b-frames
video_codec_ctx->profile = FF_PROFILE_H264_BASELINE | FF_PROFILE_H264_CONSTRAINED;
av_opt_set(video_codec_ctx->priv_data, "preset", "slow", 0);
av_opt_set(video_codec_ctx->priv_data, "tune", "zerolatency", 0);
av_opt_set(video_codec_ctx->priv_data, "vprofile", "baseline", AV_OPT_SEARCH_CHILDREN);
break;
case AV_CODEC_ID_HEVC:
// tested to work with defaults
break;
case AV_CODEC_ID_VP9:
// tested to work with defaults
break;
default:
ZmqLogger::Instance()->AppendDebugMethod("No codec-specific options defined for this codec. HW encoding may fail",
"codec_id", video_codec_ctx->codec_id);
break;
}
// set hw_frames_ctx for encoder's AVCodecContext
int err;
if ((err = set_hwframe_ctx(video_codec_ctx, hw_device_ctx, info.width, info.height)) < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::open_video (set_hwframe_ctx) ERROR faled to set hwframe context",
"width", info.width, "height", info.height, av_err2string(err), -1);
}
}
#endif // USE_HW_ACCEL
/* open the codec */
if (avcodec_open2(video_codec_ctx, codec, &opts) < 0)
throw InvalidCodec("Could not open video codec", path);
AV_COPY_PARAMS_FROM_CONTEXT(st, video_codec_ctx);
// Free options
av_dict_free(&opts);
// Add video metadata (if any)
for (std::map<std::string, std::string>::iterator iter = info.metadata.begin(); iter != info.metadata.end(); ++iter) {
av_dict_set(&st->metadata, iter->first.c_str(), iter->second.c_str(), 0);
}
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::open_video", "video_codec_ctx->thread_count", video_codec_ctx->thread_count);
}
// write all queued frames' audio to the video file
void FFmpegWriter::write_audio_packets(bool is_final) {
// Init audio buffers / variables
int total_frame_samples = 0;
int frame_position = 0;
int channels_in_frame = 0;
int sample_rate_in_frame = 0;
int samples_in_frame = 0;
ChannelLayout channel_layout_in_frame = LAYOUT_MONO; // default channel layout
// Create a new array (to hold all S16 audio samples, for the current queued frames
unsigned int all_queued_samples_size = sizeof(int16_t) * (queued_audio_frames.size() * AVCODEC_MAX_AUDIO_FRAME_SIZE);
int16_t *all_queued_samples = (int16_t *) av_malloc(all_queued_samples_size);
int16_t *all_resampled_samples = NULL;
int16_t *final_samples_planar = NULL;
int16_t *final_samples = NULL;
// Loop through each queued audio frame
while (!queued_audio_frames.empty()) {
// Get front frame (from the queue)
std::shared_ptr<Frame> frame = queued_audio_frames.front();
// Get the audio details from this frame
sample_rate_in_frame = frame->SampleRate();
samples_in_frame = frame->GetAudioSamplesCount();
channels_in_frame = frame->GetAudioChannelsCount();
channel_layout_in_frame = frame->ChannelsLayout();
// Get audio sample array
float *frame_samples_float = NULL;
// Get samples interleaved together (c1 c2 c1 c2 c1 c2)
frame_samples_float = frame->GetInterleavedAudioSamples(sample_rate_in_frame, NULL, &samples_in_frame);
// Calculate total samples
total_frame_samples = samples_in_frame * channels_in_frame;
// Translate audio sample values back to 16 bit integers with saturation
const int16_t max16 = 32767;
const int16_t min16 = -32768;
for (int s = 0; s < total_frame_samples; s++, frame_position++) {
float valF = frame_samples_float[s] * (1 << 15);
int16_t conv;
if (valF > max16) {
conv = max16;
} else if (valF < min16) {
conv = min16;
} else {
conv = int(valF + 32768.5) - 32768; // +0.5 is for rounding
}
// Copy into buffer
all_queued_samples[frame_position] = conv;
}
// Deallocate float array
delete[] frame_samples_float;
// Remove front item
queued_audio_frames.pop_front();
} // end while
// Update total samples (since we've combined all queued frames)
total_frame_samples = frame_position;
int remaining_frame_samples = total_frame_samples;
int samples_position = 0;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets", "is_final", is_final, "total_frame_samples", total_frame_samples, "channel_layout_in_frame", channel_layout_in_frame, "channels_in_frame", channels_in_frame, "samples_in_frame", samples_in_frame, "LAYOUT_MONO", LAYOUT_MONO);
// Keep track of the original sample format
AVSampleFormat output_sample_fmt = audio_codec_ctx->sample_fmt;
AVFrame *audio_frame = NULL;
if (!is_final) {
// Create input frame (and allocate arrays)
audio_frame = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(audio_frame);
audio_frame->nb_samples = total_frame_samples / channels_in_frame;
// Fill input frame with sample data
int error_code = avcodec_fill_audio_frame(audio_frame, channels_in_frame, AV_SAMPLE_FMT_S16, (uint8_t *) all_queued_samples, all_queued_samples_size, 0);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets ERROR [" + av_err2string(error_code) + "]", "error_code", error_code);
}
// Do not convert audio to planar format (yet). We need to keep everything interleaved at this point.
switch (audio_codec_ctx->sample_fmt) {
case AV_SAMPLE_FMT_FLTP: {
output_sample_fmt = AV_SAMPLE_FMT_FLT;
break;
}
case AV_SAMPLE_FMT_S32P: {
output_sample_fmt = AV_SAMPLE_FMT_S32;
break;
}
case AV_SAMPLE_FMT_S16P: {
output_sample_fmt = AV_SAMPLE_FMT_S16;
break;
}
case AV_SAMPLE_FMT_U8P: {
output_sample_fmt = AV_SAMPLE_FMT_U8;
break;
}
default: {
// This is only here to silence unused-enum warnings
break;
}
}
// Update total samples & input frame size (due to bigger or smaller data types)
total_frame_samples *= (float(info.sample_rate) / sample_rate_in_frame); // adjust for different byte sizes
total_frame_samples *= (float(info.channels) / channels_in_frame); // adjust for different # of channels
// Create output frame (and allocate arrays)
AVFrame *audio_converted = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(audio_converted);
audio_converted->nb_samples = total_frame_samples / channels_in_frame;
av_samples_alloc(audio_converted->data, audio_converted->linesize, info.channels, audio_converted->nb_samples, output_sample_fmt, 0);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets (1st resampling)", "in_sample_fmt", AV_SAMPLE_FMT_S16, "out_sample_fmt", output_sample_fmt, "in_sample_rate", sample_rate_in_frame, "out_sample_rate", info.sample_rate, "in_channels", channels_in_frame, "out_channels", info.channels);
// setup resample context
if (!avr) {
avr = SWR_ALLOC();
av_opt_set_int(avr, "in_channel_layout", channel_layout_in_frame, 0);
av_opt_set_int(avr, "out_channel_layout", info.channel_layout, 0);
av_opt_set_int(avr, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
av_opt_set_int(avr, "out_sample_fmt", output_sample_fmt, 0); // planar not allowed here
av_opt_set_int(avr, "in_sample_rate", sample_rate_in_frame, 0);
av_opt_set_int(avr, "out_sample_rate", info.sample_rate, 0);
av_opt_set_int(avr, "in_channels", channels_in_frame, 0);
av_opt_set_int(avr, "out_channels", info.channels, 0);
SWR_INIT(avr);
}
// Convert audio samples
int nb_samples = SWR_CONVERT(
avr, // audio resample context
audio_converted->data, // output data pointers
audio_converted->linesize[0], // output plane size, in bytes. (0 if unknown)
audio_converted->nb_samples, // maximum number of samples that the output buffer can hold
audio_frame->data, // input data pointers
audio_frame->linesize[0], // input plane size, in bytes (0 if unknown)
audio_frame->nb_samples // number of input samples to convert
);
// Set remaining samples
remaining_frame_samples = total_frame_samples;
// Create a new array (to hold all resampled S16 audio samples)
all_resampled_samples = (int16_t *) av_malloc(
sizeof(int16_t) * nb_samples * info.channels
* (av_get_bytes_per_sample(output_sample_fmt) /
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) )
);
// Copy audio samples over original samples
memcpy(all_resampled_samples, audio_converted->data[0],
static_cast<size_t>(nb_samples)
* info.channels
* av_get_bytes_per_sample(output_sample_fmt));
// Remove converted audio
av_freep(&(audio_frame->data[0]));
AV_FREE_FRAME(&audio_frame);
av_freep(&audio_converted->data[0]);
AV_FREE_FRAME(&audio_converted);
all_queued_samples = NULL; // this array cleared with above call
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets (Successfully completed 1st resampling)", "nb_samples", nb_samples, "remaining_frame_samples", remaining_frame_samples);
}
// Loop until no more samples
while (remaining_frame_samples > 0 || is_final) {
// Get remaining samples needed for this packet
int remaining_packet_samples = (audio_input_frame_size * info.channels) - audio_input_position;
// Determine how many samples we need
int diff = 0;
if (remaining_frame_samples >= remaining_packet_samples) {
diff = remaining_packet_samples;
} else {
diff = remaining_frame_samples;
}
// Copy frame samples into the packet samples array
if (!is_final)
//TODO: Make this more sane
memcpy(
samples + (audio_input_position
* (av_get_bytes_per_sample(output_sample_fmt) /
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) )
),
all_resampled_samples + samples_position,
static_cast<size_t>(diff)
* av_get_bytes_per_sample(output_sample_fmt)
);
// Increment counters
audio_input_position += diff;
samples_position += diff * (av_get_bytes_per_sample(output_sample_fmt) / av_get_bytes_per_sample(AV_SAMPLE_FMT_S16));
remaining_frame_samples -= diff;
// Do we have enough samples to proceed?
if (audio_input_position < (audio_input_frame_size * info.channels) && !is_final)
// Not enough samples to encode... so wait until the next frame
break;
// Convert to planar (if needed by audio codec)
AVFrame *frame_final = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(frame_final);
if (av_sample_fmt_is_planar(audio_codec_ctx->sample_fmt)) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::write_audio_packets (2nd resampling for Planar formats)",
"in_sample_fmt", output_sample_fmt,
"out_sample_fmt", audio_codec_ctx->sample_fmt,
"in_sample_rate", info.sample_rate,
"out_sample_rate", info.sample_rate,
"in_channels", info.channels,
"out_channels", info.channels
);
// setup resample context
if (!avr_planar) {
avr_planar = SWR_ALLOC();
av_opt_set_int(avr_planar, "in_channel_layout", info.channel_layout, 0);
av_opt_set_int(avr_planar, "out_channel_layout", info.channel_layout, 0);
av_opt_set_int(avr_planar, "in_sample_fmt", output_sample_fmt, 0);
av_opt_set_int(avr_planar, "out_sample_fmt", audio_codec_ctx->sample_fmt, 0); // planar not allowed here
av_opt_set_int(avr_planar, "in_sample_rate", info.sample_rate, 0);
av_opt_set_int(avr_planar, "out_sample_rate", info.sample_rate, 0);
av_opt_set_int(avr_planar, "in_channels", info.channels, 0);
av_opt_set_int(avr_planar, "out_channels", info.channels, 0);
SWR_INIT(avr_planar);
}
// Create input frame (and allocate arrays)
audio_frame = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(audio_frame);
audio_frame->nb_samples = audio_input_position / info.channels;
// Create a new array
final_samples_planar = (int16_t *) av_malloc(
sizeof(int16_t) * audio_frame->nb_samples * info.channels
* (av_get_bytes_per_sample(output_sample_fmt) /
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) )
);
// Copy audio into buffer for frame
memcpy(final_samples_planar, samples,
static_cast<size_t>(audio_frame->nb_samples)
* info.channels
* av_get_bytes_per_sample(output_sample_fmt));
// Fill input frame with sample data
avcodec_fill_audio_frame(audio_frame, info.channels, output_sample_fmt,
(uint8_t *) final_samples_planar, audio_encoder_buffer_size, 0);
// Create output frame (and allocate arrays)
frame_final->nb_samples = audio_input_frame_size;
frame_final->channels = info.channels;
frame_final->format = audio_codec_ctx->sample_fmt;
frame_final->channel_layout = info.channel_layout;
av_samples_alloc(frame_final->data, frame_final->linesize, info.channels,
frame_final->nb_samples, audio_codec_ctx->sample_fmt, 0);
// Convert audio samples
int nb_samples = SWR_CONVERT(
avr_planar, // audio resample context
frame_final->data, // output data pointers
frame_final->linesize[0], // output plane size, in bytes. (0 if unknown)
frame_final->nb_samples, // maximum number of samples that the output buffer can hold
audio_frame->data, // input data pointers
audio_frame->linesize[0], // input plane size, in bytes (0 if unknown)
audio_frame->nb_samples // number of input samples to convert
);
// Copy audio samples over original samples
const auto copy_length = static_cast<size_t>(nb_samples)
* av_get_bytes_per_sample(audio_codec_ctx->sample_fmt)
* info.channels;
if (nb_samples > 0)
memcpy(samples, frame_final->data[0], copy_length);
// deallocate AVFrame
av_freep(&(audio_frame->data[0]));
AV_FREE_FRAME(&audio_frame);
all_queued_samples = NULL; // this array cleared with above call
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets (Successfully completed 2nd resampling for Planar formats)", "nb_samples", nb_samples);
} else {
// Create a new array
const auto buf_size = static_cast<size_t>(audio_input_position)
* (av_get_bytes_per_sample(audio_codec_ctx->sample_fmt) /
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16)
);
final_samples = reinterpret_cast<int16_t*>(
av_malloc(sizeof(int16_t) * buf_size));
// Copy audio into buffer for frame
memcpy(final_samples, samples,
audio_input_position * av_get_bytes_per_sample(audio_codec_ctx->sample_fmt));
// Init the nb_samples property
frame_final->nb_samples = audio_input_frame_size;
// Fill the final_frame AVFrame with audio (non planar)
avcodec_fill_audio_frame(frame_final, audio_codec_ctx->channels,
audio_codec_ctx->sample_fmt, (uint8_t *) final_samples,
audio_encoder_buffer_size, 0);
}
// Set the AVFrame's PTS
frame_final->pts = audio_timestamp;
// Init the packet
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = audio_encoder_buffer;
pkt.size = audio_encoder_buffer_size;
// Set the packet's PTS prior to encoding
pkt.pts = pkt.dts = audio_timestamp;
/* encode the audio samples */
int got_packet_ptr = 0;
#if IS_FFMPEG_3_2
// Encode audio (latest version of FFmpeg)
int error_code;
int ret = 0;
int frame_finished = 0;
error_code = ret = avcodec_send_frame(audio_codec_ctx, frame_final);
if (ret < 0 && ret != AVERROR(EINVAL) && ret != AVERROR_EOF) {
avcodec_send_frame(audio_codec_ctx, NULL);
}
else {
if (ret >= 0)
pkt.size = 0;
ret = avcodec_receive_packet(audio_codec_ctx, &pkt);
if (ret >= 0)
frame_finished = 1;
if(ret == AVERROR(EINVAL) || ret == AVERROR_EOF) {
avcodec_flush_buffers(audio_codec_ctx);
ret = 0;
}
if (ret >= 0) {
ret = frame_finished;
}
}
if (!pkt.data && !frame_finished)
{
ret = -1;
}
got_packet_ptr = ret;
#else
// Encode audio (older versions of FFmpeg)
int error_code = avcodec_encode_audio2(audio_codec_ctx, &pkt, frame_final, &got_packet_ptr);
#endif
/* if zero size, it means the image was buffered */
if (error_code == 0 && got_packet_ptr) {
// Since the PTS can change during encoding, set the value again. This seems like a huge hack,
// but it fixes lots of PTS related issues when I do this.
pkt.pts = pkt.dts = audio_timestamp;
// Scale the PTS to the audio stream timebase (which is sometimes different than the codec's timebase)
av_packet_rescale_ts(&pkt, audio_codec_ctx->time_base, audio_st->time_base);
// set stream
pkt.stream_index = audio_st->index;
pkt.flags |= AV_PKT_FLAG_KEY;
/* write the compressed frame in the media file */
error_code = av_interleaved_write_frame(oc, &pkt);
}
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets ERROR [" + av_err2string(error_code) + "]", "error_code", error_code);
}
// Increment PTS (no pkt.duration, so calculate with maths)
audio_timestamp += FFMIN(audio_input_frame_size, audio_input_position);
// deallocate AVFrame
av_freep(&(frame_final->data[0]));
AV_FREE_FRAME(&frame_final);
// deallocate memory for packet
AV_FREE_PACKET(&pkt);
// Reset position
audio_input_position = 0;
is_final = false;
}
// Delete arrays (if needed)
if (all_resampled_samples) {
av_freep(&all_resampled_samples);
all_resampled_samples = NULL;
}
if (all_queued_samples) {
av_freep(&all_queued_samples);
all_queued_samples = NULL;
}
}
// Allocate an AVFrame object
AVFrame *FFmpegWriter::allocate_avframe(PixelFormat pix_fmt, int width, int height, int *buffer_size, uint8_t *new_buffer) {
// Create an RGB AVFrame
AVFrame *new_av_frame = NULL;
// Allocate an AVFrame structure
new_av_frame = AV_ALLOCATE_FRAME();
if (new_av_frame == NULL)
throw OutOfMemory("Could not allocate AVFrame", path);
// Determine required buffer size and allocate buffer
*buffer_size = AV_GET_IMAGE_SIZE(pix_fmt, width, height);
// Create buffer (if not provided)
if (!new_buffer) {
// New Buffer
new_buffer = (uint8_t *) av_malloc(*buffer_size * sizeof(uint8_t));
// Attach buffer to AVFrame
AV_COPY_PICTURE_DATA(new_av_frame, new_buffer, pix_fmt, width, height);
new_av_frame->width = width;
new_av_frame->height = height;
new_av_frame->format = pix_fmt;
}
// return AVFrame
return new_av_frame;
}
// process video frame
void FFmpegWriter::process_video_packet(std::shared_ptr<Frame> frame) {
// Determine the height & width of the source image
int source_image_width = frame->GetWidth();
int source_image_height = frame->GetHeight();
// Do nothing if size is 1x1 (i.e. no image in this frame)
if (source_image_height == 1 && source_image_width == 1)
return;
// Init rescalers (if not initialized yet)
if (image_rescalers.size() == 0)
InitScalers(source_image_width, source_image_height);
// Get a unique rescaler (for this thread)
SwsContext *scaler = image_rescalers[rescaler_position];
rescaler_position++;
if (rescaler_position == num_of_rescalers)
rescaler_position = 0;
// Allocate an RGB frame & final output frame
int bytes_source = 0;
int bytes_final = 0;
AVFrame *frame_source = NULL;
const uchar *pixels = NULL;
// Get a list of pixels from source image
pixels = frame->GetPixels();
// Init AVFrame for source image & final (converted image)
frame_source = allocate_avframe(PIX_FMT_RGBA, source_image_width, source_image_height, &bytes_source, (uint8_t *) pixels);
#if IS_FFMPEG_3_2
AVFrame *frame_final;
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
frame_final = allocate_avframe(AV_PIX_FMT_NV12, info.width, info.height, &bytes_final, NULL);
} else
#endif // USE_HW_ACCEL
{
frame_final = allocate_avframe(
(AVPixelFormat)(video_st->codecpar->format),
info.width, info.height, &bytes_final, NULL
);
}
#else
AVFrame *frame_final = allocate_avframe(video_codec_ctx->pix_fmt, info.width, info.height, &bytes_final, NULL);
#endif // IS_FFMPEG_3_2
// Fill with data
AV_COPY_PICTURE_DATA(frame_source, (uint8_t *) pixels, PIX_FMT_RGBA, source_image_width, source_image_height);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::process_video_packet", "frame->number", frame->number, "bytes_source", bytes_source, "bytes_final", bytes_final);
// Resize & convert pixel format
sws_scale(scaler, frame_source->data, frame_source->linesize, 0,
source_image_height, frame_final->data, frame_final->linesize);
// Add resized AVFrame to av_frames map
add_avframe(frame, frame_final);
// Deallocate memory
AV_FREE_FRAME(&frame_source);
}
// write video frame
bool FFmpegWriter::write_video_packet(std::shared_ptr<Frame> frame, AVFrame *frame_final) {
#if (LIBAVFORMAT_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet",
"frame->number", frame->number, "oc->oformat->flags", oc->oformat->flags);
if (AV_GET_CODEC_TYPE(video_st) == AVMEDIA_TYPE_VIDEO && AV_FIND_DECODER_CODEC_ID(video_st) == AV_CODEC_ID_RAWVIDEO) {
#else
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet",
"frame->number", frame->number,
"oc->oformat->flags & AVFMT_RAWPICTURE", oc->oformat->flags & AVFMT_RAWPICTURE);
if (oc->oformat->flags & AVFMT_RAWPICTURE) {
#endif
// Raw video case.
AVPacket pkt;
av_init_packet(&pkt);
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.stream_index = video_st->index;
pkt.data = (uint8_t *) frame_final->data;
pkt.size = sizeof(AVPicture);
// Set PTS (in frames and scaled to the codec's timebase)
pkt.pts = video_timestamp;
/* write the compressed frame in the media file */
int error_code = av_interleaved_write_frame(oc, &pkt);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet ERROR [" + av_err2string(error_code) + "]", "error_code", error_code);
return false;
}
// Deallocate packet
AV_FREE_PACKET(&pkt);
} else
{
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
pkt.pts = pkt.dts = AV_NOPTS_VALUE;
// Assign the initial AVFrame PTS from the frame counter
frame_final->pts = video_timestamp;
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
if (!(hw_frame = av_frame_alloc())) {
std::clog << "Error code: av_hwframe_alloc\n";
}
if (av_hwframe_get_buffer(video_codec_ctx->hw_frames_ctx, hw_frame, 0) < 0) {
std::clog << "Error code: av_hwframe_get_buffer\n";
}
if (!hw_frame->hw_frames_ctx) {
std::clog << "Error hw_frames_ctx.\n";
}
hw_frame->format = AV_PIX_FMT_NV12;
if ( av_hwframe_transfer_data(hw_frame, frame_final, 0) < 0) {
std::clog << "Error while transferring frame data to surface.\n";
}
av_frame_copy_props(hw_frame, frame_final);
}
#endif // USE_HW_ACCEL
/* encode the image */
int got_packet_ptr = 0;
int error_code = 0;
#if IS_FFMPEG_3_2
// Write video packet (latest version of FFmpeg)
int ret;
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
ret = avcodec_send_frame(video_codec_ctx, hw_frame); //hw_frame!!!
} else
#endif // USE_HW_ACCEL
{
ret = avcodec_send_frame(video_codec_ctx, frame_final);
}
error_code = ret;
if (ret < 0 ) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet (Frame not sent)");
if (ret == AVERROR(EAGAIN) ) {
std::clog << "Frame EAGAIN\n";
}
if (ret == AVERROR_EOF ) {
std::clog << "Frame AVERROR_EOF\n";
}
avcodec_send_frame(video_codec_ctx, NULL);
}
else {
while (ret >= 0) {
ret = avcodec_receive_packet(video_codec_ctx, &pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
avcodec_flush_buffers(video_codec_ctx);
got_packet_ptr = 0;
break;
}
if (ret == 0) {
got_packet_ptr = 1;
break;
}
}
}
#else
// Write video packet (older than FFmpeg 3.2)
error_code = avcodec_encode_video2(video_codec_ctx, &pkt, frame_final, &got_packet_ptr);
if (error_code != 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet ERROR [" + av_err2string(error_code) + "]", "error_code", error_code);
}
if (got_packet_ptr == 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet (Frame gotpacket error)");
}
#endif // IS_FFMPEG_3_2
/* if zero size, it means the image was buffered */
if (error_code == 0 && got_packet_ptr) {
// set the timestamp
av_packet_rescale_ts(&pkt, video_codec_ctx->time_base, video_st->time_base);
pkt.stream_index = video_st->index;
/* write the compressed frame in the media file */
int result = av_interleaved_write_frame(oc, &pkt);
if (result < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet ERROR [" + av_err2string(result) + "]", "result", result);
return false;
}
}
// Deallocate packet
AV_FREE_PACKET(&pkt);
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
if (hw_frame) {
av_frame_free(&hw_frame);
hw_frame = NULL;
}
}
#endif // USE_HW_ACCEL
}
// Increment PTS (in frames and scaled to the codec's timebase)
video_timestamp += av_rescale_q(1, av_make_q(info.fps.den, info.fps.num), video_codec_ctx->time_base);
// Success
return true;
}
// Output the ffmpeg info about this format, streams, and codecs (i.e. dump format)
void FFmpegWriter::OutputStreamInfo() {
// output debug info
av_dump_format(oc, 0, path.c_str(), 1);
}
// Init a collection of software rescalers (thread safe)
void FFmpegWriter::InitScalers(int source_width, int source_height) {
int scale_mode = SWS_FAST_BILINEAR;
if (openshot::Settings::Instance()->HIGH_QUALITY_SCALING) {
scale_mode = SWS_BICUBIC;
}
// Init software rescalers vector (many of them, one for each thread)
for (int x = 0; x < num_of_rescalers; x++) {
// Init the software scaler from FFMpeg
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
img_convert_ctx = sws_getContext(source_width, source_height, PIX_FMT_RGBA,
info.width, info.height, AV_PIX_FMT_NV12, scale_mode, NULL, NULL, NULL);
} else
#endif // USE_HW_ACCEL
{
img_convert_ctx = sws_getContext(source_width, source_height, PIX_FMT_RGBA,
info.width, info.height, AV_GET_CODEC_PIXEL_FORMAT(video_st, video_st->codec),
scale_mode, NULL, NULL, NULL);
}
// Add rescaler to vector
image_rescalers.push_back(img_convert_ctx);
}
}
// Set audio resample options
void FFmpegWriter::ResampleAudio(int sample_rate, int channels) {
original_sample_rate = sample_rate;
original_channels = channels;
}
// Remove & deallocate all software scalers
void FFmpegWriter::RemoveScalers() {
// Close all rescalers
for (int x = 0; x < num_of_rescalers; x++)
sws_freeContext(image_rescalers[x]);
// Clear vector
image_rescalers.clear();
}
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