1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
// Copyright 2015 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_h265_to_annex_b_bitstream_converter.h"
#include "base/logging.h"
#include "media/base/decrypt_config.h"
#include "media/ffmpeg/ffmpeg_common.h"
#include "media/formats/mp4/avc.h"
#include "media/formats/mp4/box_definitions.h"
#include "media/formats/mp4/hevc.h"
namespace media {
FFmpegH265ToAnnexBBitstreamConverter::FFmpegH265ToAnnexBBitstreamConverter(
AVCodecContext* stream_codec_context)
: stream_codec_context_(stream_codec_context) {
CHECK(stream_codec_context_);
}
FFmpegH265ToAnnexBBitstreamConverter::~FFmpegH265ToAnnexBBitstreamConverter() {}
bool FFmpegH265ToAnnexBBitstreamConverter::ConvertPacket(AVPacket* packet) {
DVLOG(3) << __FUNCTION__;
if (packet == NULL || !packet->data)
return false;
// Calculate the needed output buffer size.
if (!hevc_config_) {
if (!stream_codec_context_->extradata ||
stream_codec_context_->extradata_size <= 0) {
DVLOG(1) << "HEVCDecoderConfiguration not found, no extra codec data";
return false;
}
hevc_config_.reset(new mp4::HEVCDecoderConfigurationRecord());
if (!hevc_config_->Parse(
stream_codec_context_->extradata,
stream_codec_context_->extradata_size)) {
DVLOG(1) << "Parsing HEVCDecoderConfiguration failed";
return false;
}
}
std::vector<uint8> input_frame;
std::vector<SubsampleEntry> subsamples;
// TODO(servolk): Performance could be improved here, by reducing unnecessary
// data copying, but first annex b conversion code needs to be refactored to
// allow that (see crbug.com/455379).
input_frame.insert(input_frame.end(),
packet->data, packet->data + packet->size);
int nalu_size_len = hevc_config_->lengthSizeMinusOne + 1;
if (!mp4::AVC::ConvertFrameToAnnexB(nalu_size_len, &input_frame,
&subsamples)) {
DVLOG(1) << "AnnexB conversion failed";
return false;
}
if (packet->flags & AV_PKT_FLAG_KEY) {
RCHECK(mp4::HEVC::InsertParamSetsAnnexB(*hevc_config_.get(),
&input_frame, &subsamples));
DVLOG(4) << "Inserted HEVC decoder params";
}
uint32 output_packet_size = input_frame.size();
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.
memcpy(dest_packet.data, &input_frame[0], input_frame.size());
// 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
|
