gecko/content/media/ogg/nsChannelReader.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla code.
 *
 * The Initial Developer of the Original Code is the Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Chris Double <chris.double@double.co.nz>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
#include "nsAString.h"
#include "nsThreadUtils.h"
#include "nsNetUtil.h"
#include "prlog.h"
#include "nsOggDecoder.h"
#include "nsChannelReader.h"
#include "nsIScriptSecurityManager.h"

OggPlayErrorCode nsChannelReader::initialise(int aBlock)
{
  return E_OGGPLAY_OK;
}

OggPlayErrorCode nsChannelReader::destroy()
{
  // We don't have to do anything here, the decoder will clean stuff up
  return E_OGGPLAY_OK;
}

void nsChannelReader::SetLastFrameTime(PRInt64 aTime)
{
  mLastFrameTime = aTime;
}

size_t nsChannelReader::io_read(char* aBuffer, size_t aCount)
{
  PRUint32 bytes = 0;
  nsresult rv = mStream->Read(aBuffer, aCount, &bytes);
  if (!NS_SUCCEEDED(rv)) {
    return static_cast<size_t>(OGGZ_ERR_SYSTEM);
  }
  nsOggDecoder* decoder =
    static_cast<nsOggDecoder*>(mStream->Decoder());
  decoder->NotifyBytesConsumed(bytes);
  return bytes;
}

int nsChannelReader::io_seek(long aOffset, int aWhence)
{
  nsresult rv = mStream->Seek(aWhence, aOffset);
  if (NS_SUCCEEDED(rv))
    return aOffset;
  
  return OGGZ_STOP_ERR;
}

long nsChannelReader::io_tell()
{
  return mStream->Tell();
}

ogg_int64_t nsChannelReader::duration()
{
  return mLastFrameTime;
}

static OggPlayErrorCode oggplay_channel_reader_initialise(OggPlayReader* aReader, int aBlock) 
{
  nsChannelReader * me = static_cast<nsChannelReader*>(aReader);

  if (me == NULL) {
    return E_OGGPLAY_BAD_READER;
  }
  return me->initialise(aBlock);
}

static OggPlayErrorCode oggplay_channel_reader_destroy(OggPlayReader* aReader) 
{
  nsChannelReader* me = static_cast<nsChannelReader*>(aReader);
  return me->destroy();
}

static size_t oggplay_channel_reader_io_read(void* aReader, void* aBuffer, size_t aCount) 
{
  nsChannelReader* me = static_cast<nsChannelReader*>(aReader);
  return me->io_read(static_cast<char*>(aBuffer), aCount);
}

static int oggplay_channel_reader_io_seek(void* aReader, long aOffset, int aWhence) 
{
  nsChannelReader* me = static_cast<nsChannelReader*>(aReader);
  return me->io_seek(aOffset, aWhence);
}

static long oggplay_channel_reader_io_tell(void* aReader) 
{
  nsChannelReader* me = static_cast<nsChannelReader*>(aReader);
  return me->io_tell();
}

static ogg_int64_t oggplay_channel_reader_duration(struct _OggPlayReader *aReader)
{
  nsChannelReader* me = static_cast<nsChannelReader*>(aReader);
  return me->duration();
}

nsresult nsChannelReader::Init(nsMediaDecoder* aDecoder, nsIURI* aURI,
                               nsIChannel* aChannel,
                               nsIStreamListener** aStreamListener)
{
  return nsMediaStream::Open(aDecoder, aURI, aChannel,
                             getter_Transfers(mStream), aStreamListener);
}

nsChannelReader::~nsChannelReader()
{
  MOZ_COUNT_DTOR(nsChannelReader);
}

nsChannelReader::nsChannelReader() :
  mLastFrameTime(-1)
{
  MOZ_COUNT_CTOR(nsChannelReader);
  OggPlayReader* reader = this;
  reader->initialise = &oggplay_channel_reader_initialise;
  reader->destroy = &oggplay_channel_reader_destroy;
  reader->seek = 0;
  reader->io_read  = &oggplay_channel_reader_io_read;
  reader->io_seek  = &oggplay_channel_reader_io_seek;
  reader->io_tell  = &oggplay_channel_reader_io_tell;
  reader->duration = &oggplay_channel_reader_duration;
}