// 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 #include "base/logging.h" #include "media/ffmpeg/ffmpeg_common.h" #include "media/formats/mp4/box_definitions.h" namespace media { FFmpegH264ToAnnexBBitstreamConverter::FFmpegH264ToAnnexBBitstreamConverter( AVCodecParameters* stream_codec_parameters) : configuration_processed_(false), stream_codec_parameters_(stream_codec_parameters) { CHECK(stream_codec_parameters_); } FFmpegH264ToAnnexBBitstreamConverter::~FFmpegH264ToAnnexBBitstreamConverter() = default; bool FFmpegH264ToAnnexBBitstreamConverter::ConvertPacket(AVPacket* packet) { std::unique_ptr avc_config; if (packet == NULL || !packet->data) { DVLOG(2) << __func__ << ": Null or empty packet"; return false; } // Calculate the needed output buffer size. if (!configuration_processed_) { if (!stream_codec_parameters_->extradata || stream_codec_parameters_->extradata_size <= 0) { DVLOG(2) << __func__ << ": Empty extra data"; return false; } avc_config.reset(new mp4::AVCDecoderConfigurationRecord()); if (!converter_.ParseConfiguration(stream_codec_parameters_->extradata, stream_codec_parameters_->extradata_size, avc_config.get())) { DVLOG(2) << __func__ << ": ParseConfiguration() failure"; return false; } } uint32_t output_packet_size = converter_.CalculateNeededOutputBufferSize( packet->data, packet->size, avc_config.get()); if (output_packet_size == 0) { DVLOG(2) << __func__ << ": zero |output_packet_size|"; return false; // Invalid input packet. } // Allocate new packet for the output. AVPacket dest_packet; if (av_new_packet(&dest_packet, output_packet_size) != 0) { DVLOG(2) << __func__ << ": Memory allocation failure"; return false; } // 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_t io_size = dest_packet.size; if (!converter_.ConvertNalUnitStreamToByteStream( packet->data, packet->size, avc_config.get(), dest_packet.data, &io_size)) { DVLOG(2) << __func__ << ": ConvertNalUnitStreamToByteStream() failure"; return false; } if (avc_config) configuration_processed_ = true; // At the end we must destroy the old packet. av_packet_unref(packet); // Finally, replace the values in the input packet. memcpy(packet, &dest_packet, sizeof(*packet)); return true; } } // namespace media