gecko/content/media/ogg/OggWriter.cpp

115 lines
3.4 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "OggWriter.h"
#include "prtime.h"
#undef LOG
#ifdef MOZ_WIDGET_GONK
#include <android/log.h>
#define LOG(args...) __android_log_print(ANDROID_LOG_INFO, "MediaEncoder", ## args);
#else
#define LOG(args, ...)
#endif
namespace mozilla {
OggWriter::OggWriter() : ContainerWriter()
{
if (NS_FAILED(Init())) {
LOG("ERROR! Fail to initialize the OggWriter.");
}
}
nsresult
OggWriter::Init()
{
MOZ_ASSERT(!mInitialized);
// The serial number (serialno) should be a random number, for the current
// implementation where the output file contains only a single stream, this
// serialno is used to differentiate between files.
srand(static_cast<unsigned>(PR_Now()));
int rc = ogg_stream_init(&mOggStreamState, rand());
mPacket.b_o_s = 1;
mPacket.e_o_s = 0;
mPacket.granulepos = 0;
mPacket.packet = nullptr;
mPacket.packetno = 0;
mPacket.bytes = 0;
mInitialized = (rc == 0);
return (rc == 0) ? NS_OK : NS_ERROR_NOT_INITIALIZED;
}
nsresult
OggWriter::WriteEncodedTrack(const nsTArray<uint8_t>& aBuffer, int aDuration,
uint32_t aFlags)
{
MOZ_ASSERT(!ogg_stream_eos(&mOggStreamState),
"No data can be written after eos has marked.");
// Set eos flag to true, and once the eos is written to a packet, there must
// not be anymore pages after a page has marked as eos.
if (aFlags & ContainerWriter::END_OF_STREAM) {
LOG("[OggWriter] Set e_o_s flag to true.");
mPacket.e_o_s = 1;
}
mPacket.packet = const_cast<uint8_t*>(aBuffer.Elements());
mPacket.bytes = aBuffer.Length();
mPacket.granulepos += aDuration;
// 0 returned on success. -1 returned in the event of internal error.
// The data in the packet is copied into the internal storage managed by the
// mOggStreamState, so we are free to alter the contents of mPacket after
// this call has returned.
int rc = ogg_stream_packetin(&mOggStreamState, &mPacket);
if (rc < 0) {
LOG("[OggWriter] Failed in ogg_stream_packetin! (%d).", rc);
return NS_ERROR_FAILURE;
}
if (mPacket.b_o_s) {
mPacket.b_o_s = 0;
}
mPacket.packetno++;
mPacket.packet = nullptr;
return NS_OK;
}
nsresult
OggWriter::GetContainerData(nsTArray<nsTArray<uint8_t> >* aOutputBufs,
uint32_t aFlags)
{
int rc = -1;
// Force generate a page even if the amount of packet data is not enough.
// Usually do so after a header packet.
if (aFlags & ContainerWriter::FLUSH_NEEDED) {
// rc = 0 means no packet to put into a page, or an internal error.
rc = ogg_stream_flush(&mOggStreamState, &mOggPage);
} else {
// rc = 0 means insufficient data has accumulated to fill a page, or an
// internal error has occurred.
rc = ogg_stream_pageout(&mOggStreamState, &mOggPage);
}
if (rc) {
aOutputBufs->AppendElement();
aOutputBufs->LastElement().SetLength(mOggPage.header_len +
mOggPage.body_len);
memcpy(aOutputBufs->LastElement().Elements(), mOggPage.header,
mOggPage.header_len);
memcpy(aOutputBufs->LastElement().Elements() + mOggPage.header_len,
mOggPage.body, mOggPage.body_len);
}
return (rc > 0) ? NS_OK : NS_ERROR_FAILURE;
}
}