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// 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/base/video_codecs.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
namespace media {
// The names come from src/third_party/ffmpeg/libavcodec/codec_desc.c
std::string GetCodecName(VideoCodec codec) {
switch (codec) {
case kUnknownVideoCodec:
return "unknown";
case kCodecH264:
return "h264";
case kCodecHEVC:
return "hevc";
case kCodecVC1:
return "vc1";
case kCodecMPEG2:
return "mpeg2video";
case kCodecMPEG4:
return "mpeg4";
case kCodecTheora:
return "theora";
case kCodecVP8:
return "vp8";
case kCodecVP9:
return "vp9";
}
NOTREACHED();
return "";
}
std::string GetProfileName(VideoCodecProfile profile) {
switch (profile) {
case VIDEO_CODEC_PROFILE_UNKNOWN:
return "unknown";
case H264PROFILE_BASELINE:
return "h264 baseline";
case H264PROFILE_MAIN:
return "h264 main";
case H264PROFILE_EXTENDED:
return "h264 extended";
case H264PROFILE_HIGH:
return "h264 high";
case H264PROFILE_HIGH10PROFILE:
return "h264 high 10";
case H264PROFILE_HIGH422PROFILE:
return "h264 high 4:2:2";
case H264PROFILE_HIGH444PREDICTIVEPROFILE:
return "h264 high 4:4:4 predictive";
case H264PROFILE_SCALABLEBASELINE:
return "h264 scalable baseline";
case H264PROFILE_SCALABLEHIGH:
return "h264 scalable high";
case H264PROFILE_STEREOHIGH:
return "h264 stereo high";
case H264PROFILE_MULTIVIEWHIGH:
return "h264 multiview high";
case VP8PROFILE_ANY:
return "vp8";
case VP9PROFILE_ANY:
return "vp9";
}
NOTREACHED();
return "";
}
bool ParseAVCCodecId(const std::string& codec_id,
VideoCodecProfile* profile,
uint8_t* level_idc) {
// Make sure we have avc1.xxxxxx or avc3.xxxxxx , where xxxxxx are hex digits
if (!base::StartsWith(codec_id, "avc1.", base::CompareCase::SENSITIVE) &&
!base::StartsWith(codec_id, "avc3.", base::CompareCase::SENSITIVE)) {
return false;
}
uint32_t elem = 0;
if (codec_id.size() != 11 ||
!base::HexStringToUInt(base::StringPiece(codec_id).substr(5), &elem)) {
DVLOG(4) << __FUNCTION__ << ": invalid avc codec id (" << codec_id << ")";
return false;
}
uint8_t level_byte = elem & 0xFF;
uint8_t constraints_byte = (elem >> 8) & 0xFF;
uint8_t profile_idc = (elem >> 16) & 0xFF;
// Check that the lower two bits of |constraints_byte| are zero (those are
// reserved and must be zero according to ISO IEC 14496-10).
if (constraints_byte & 3) {
DVLOG(4) << __FUNCTION__ << ": non-zero reserved bits in codec id "
<< codec_id;
return false;
}
VideoCodecProfile out_profile = VIDEO_CODEC_PROFILE_UNKNOWN;
// profile_idc values for each profile are taken from ISO IEC 14496-10 and
// https://en.wikipedia.org/wiki/H.264/MPEG-4_AVC#Profiles
switch (profile_idc) {
case 66:
out_profile = H264PROFILE_BASELINE;
break;
case 77:
out_profile = H264PROFILE_MAIN;
break;
case 83:
out_profile = H264PROFILE_SCALABLEBASELINE;
break;
case 86:
out_profile = H264PROFILE_SCALABLEHIGH;
break;
case 88:
out_profile = H264PROFILE_EXTENDED;
break;
case 100:
out_profile = H264PROFILE_HIGH;
break;
case 110:
out_profile = H264PROFILE_HIGH10PROFILE;
break;
case 118:
out_profile = H264PROFILE_MULTIVIEWHIGH;
break;
case 122:
out_profile = H264PROFILE_HIGH422PROFILE;
break;
case 128:
out_profile = H264PROFILE_STEREOHIGH;
break;
case 244:
out_profile = H264PROFILE_HIGH444PREDICTIVEPROFILE;
break;
default:
DVLOG(1) << "Warning: unrecognized AVC/H.264 profile " << profile_idc;
return false;
}
// TODO(servolk): Take into account also constraint set flags 3 through 5.
uint8_t constraint_set0_flag = (constraints_byte >> 7) & 1;
uint8_t constraint_set1_flag = (constraints_byte >> 6) & 1;
uint8_t constraint_set2_flag = (constraints_byte >> 5) & 1;
if (constraint_set2_flag && out_profile > H264PROFILE_EXTENDED) {
out_profile = H264PROFILE_EXTENDED;
}
if (constraint_set1_flag && out_profile > H264PROFILE_MAIN) {
out_profile = H264PROFILE_MAIN;
}
if (constraint_set0_flag && out_profile > H264PROFILE_BASELINE) {
out_profile = H264PROFILE_BASELINE;
}
if (level_idc)
*level_idc = level_byte;
if (profile)
*profile = out_profile;
return true;
}
} // namespace media
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