1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "media/filters/ffmpeg_h264_to_annex_b_bitstream_converter.h"
7 #include "base/logging.h"
8 #include "media/ffmpeg/ffmpeg_common.h"
9 #include "media/formats/mp4/box_definitions.h"
13 FFmpegH264ToAnnexBBitstreamConverter::FFmpegH264ToAnnexBBitstreamConverter(
14 AVCodecContext* stream_context)
15 : configuration_processed_(false),
16 stream_context_(stream_context) {
17 CHECK(stream_context_);
20 FFmpegH264ToAnnexBBitstreamConverter::~FFmpegH264ToAnnexBBitstreamConverter() {}
22 bool FFmpegH264ToAnnexBBitstreamConverter::ConvertPacket(AVPacket* packet) {
23 scoped_ptr<mp4::AVCDecoderConfigurationRecord> avc_config;
25 if (packet == NULL || !packet->data)
28 // Calculate the needed output buffer size.
29 if (!configuration_processed_) {
30 if (!stream_context_->extradata || stream_context_->extradata_size <= 0)
33 avc_config.reset(new mp4::AVCDecoderConfigurationRecord());
35 if (!converter_.ParseConfiguration(
36 stream_context_->extradata,
37 stream_context_->extradata_size,
43 uint32 output_packet_size = converter_.CalculateNeededOutputBufferSize(
44 packet->data, packet->size, avc_config.get());
46 if (output_packet_size == 0)
47 return false; // Invalid input packet.
49 // Allocate new packet for the output.
51 if (av_new_packet(&dest_packet, output_packet_size) != 0)
52 return false; // Memory allocation failure.
54 // This is a bit tricky: since the interface does not allow us to replace
55 // the pointer of the old packet with a new one, we will initially copy the
56 // metadata from old packet to new bigger packet.
57 dest_packet.pts = packet->pts;
58 dest_packet.dts = packet->dts;
59 dest_packet.pos = packet->pos;
60 dest_packet.duration = packet->duration;
61 dest_packet.convergence_duration = packet->convergence_duration;
62 dest_packet.flags = packet->flags;
63 dest_packet.stream_index = packet->stream_index;
65 // Proceed with the conversion of the actual in-band NAL units, leave room
66 // for configuration in the beginning.
67 uint32 io_size = dest_packet.size;
68 if (!converter_.ConvertNalUnitStreamToByteStream(
69 packet->data, packet->size,
71 dest_packet.data, &io_size)) {
76 configuration_processed_ = true;
78 // At the end we must destroy the old packet.
79 av_free_packet(packet);
80 *packet = dest_packet; // Finally, replace the values in the input packet.