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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/filters/ffmpeg_h264_to_annex_b_bitstream_converter.h"
#include "base/logging.h"
#include "media/ffmpeg/ffmpeg_common.h"
#include "media/formats/mp4/box_definitions.h"
namespace media {
FFmpegH264ToAnnexBBitstreamConverter::FFmpegH264ToAnnexBBitstreamConverter(
AVCodecContext* stream_codec_context)
: configuration_processed_(false),
stream_codec_context_(stream_codec_context) {
CHECK(stream_codec_context_);
}
FFmpegH264ToAnnexBBitstreamConverter::~FFmpegH264ToAnnexBBitstreamConverter() {}
bool FFmpegH264ToAnnexBBitstreamConverter::ConvertPacket(AVPacket* packet) {
scoped_ptr<mp4::AVCDecoderConfigurationRecord> avc_config;
if (packet == NULL || !packet->data)
return false;
// Calculate the needed output buffer size.
if (!configuration_processed_) {
if (!stream_codec_context_->extradata ||
stream_codec_context_->extradata_size <= 0)
return false;
avc_config.reset(new mp4::AVCDecoderConfigurationRecord());
if (!converter_.ParseConfiguration(
stream_codec_context_->extradata,
stream_codec_context_->extradata_size,
avc_config.get())) {
return false;
}
}
uint32 output_packet_size = converter_.CalculateNeededOutputBufferSize(
packet->data, packet->size, avc_config.get());
if (output_packet_size == 0)
return false; // Invalid input packet.
// Allocate new packet for the output.
AVPacket dest_packet;
if (av_new_packet(&dest_packet, output_packet_size) != 0)
return false; // Memory allocation failure.
// This is a bit tricky: since the interface does not allow us to replace
// the pointer of the old packet with a new one, we will initially copy the
// metadata from old packet to new bigger packet.
av_packet_copy_props(&dest_packet, packet);
// Proceed with the conversion of the actual in-band NAL units, leave room
// for configuration in the beginning.
uint32 io_size = dest_packet.size;
if (!converter_.ConvertNalUnitStreamToByteStream(
packet->data, packet->size,
avc_config.get(),
dest_packet.data, &io_size)) {
return false;
}
if (avc_config)
configuration_processed_ = true;
// At the end we must destroy the old packet.
av_free_packet(packet);
*packet = dest_packet; // Finally, replace the values in the input packet.
return true;
}
} // namespace media
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