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FFmpeg/libavformat/codecstring.c

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/*
* Copyright (c) 2014 Martin Storsjo
* Copyright (c) 2018 Akamai Technologies, Inc.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "libavutil/bprint.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/rational.h"
#include "av1.h"
#include "avc.h"
#include "avformat.h"
#include "internal.h"
#include "nal.h"
#include "vpcc.h"
static const struct codec_string {
enum AVCodecID id;
char str[8];
} codecs[] = {
{ AV_CODEC_ID_VP8, "vp8" },
{ AV_CODEC_ID_VP9, "vp9" },
{ AV_CODEC_ID_VORBIS, "vorbis" },
{ AV_CODEC_ID_OPUS, "opus" },
{ AV_CODEC_ID_FLAC, "flac" },
{ AV_CODEC_ID_NONE }
};
static void set_vp9_codec_str(void *logctx, const AVCodecParameters *par,
const AVRational *frame_rate, AVBPrint *out)
{
VPCC vpcc;
int ret = ff_isom_get_vpcc_features(logctx, par, NULL, 0, frame_rate, &vpcc);
if (ret == 0) {
av_bprintf(out, "vp09.%02d.%02d.%02d",
vpcc.profile, vpcc.level, vpcc.bitdepth);
} else {
// Default to just vp9 in case of error while finding out profile or level
av_log(logctx, AV_LOG_WARNING, "Could not find VP9 profile and/or level\n");
av_bprintf(out, "vp9");
}
}
int ff_make_codec_str(void *logctx, const AVCodecParameters *par,
const AVRational *frame_rate, struct AVBPrint *out)
{
int i;
// common Webm codecs are not part of RFC 6381
for (i = 0; codecs[i].id != AV_CODEC_ID_NONE; i++)
if (codecs[i].id == par->codec_id) {
if (codecs[i].id == AV_CODEC_ID_VP9) {
set_vp9_codec_str(logctx, par, frame_rate, out);
} else {
av_bprintf(out, "%s", codecs[i].str);
}
return 0;
}
if (par->codec_id == AV_CODEC_ID_H264) {
// RFC 6381
uint8_t *data = par->extradata;
if (data) {
const uint8_t *p;
if (AV_RB32(data) == 0x01 && (data[4] & 0x1F) == 7)
p = &data[5];
else if (AV_RB24(data) == 0x01 && (data[3] & 0x1F) == 7)
p = &data[4];
else if (data[0] == 0x01) /* avcC */
p = &data[1];
else
return AVERROR(EINVAL);
av_bprintf(out, "avc1.%02x%02x%02x", p[0], p[1], p[2]);
} else {
return AVERROR(EINVAL);
}
} else if (par->codec_id == AV_CODEC_ID_HEVC) {
// 3GPP TS 26.244
uint8_t *data = par->extradata;
int profile = AV_PROFILE_UNKNOWN;
uint32_t profile_compatibility = AV_PROFILE_UNKNOWN;
char tier = 0;
int level = AV_LEVEL_UNKNOWN;
char constraints[8] = "";
if (par->profile != AV_PROFILE_UNKNOWN)
profile = par->profile;
if (par->level != AV_LEVEL_UNKNOWN)
level = par->level;
/* check the boundary of data which from current position is small than extradata_size */
while (data && (data - par->extradata + 19) < par->extradata_size) {
/* get HEVC SPS NAL and seek to profile_tier_level */
if (!(data[0] | data[1] | data[2]) && data[3] == 1 && ((data[4] & 0x7E) == 0x42)) {
uint8_t *rbsp_buf;
int remain_size = 0;
int rbsp_size = 0;
uint32_t profile_compatibility_flags = 0;
uint8_t high_nibble = 0;
/* skip start code + nalu header */
data += 6;
/* process by reference General NAL unit syntax */
remain_size = par->extradata_size - (data - par->extradata);
rbsp_buf = ff_nal_unit_extract_rbsp(data, remain_size, &rbsp_size, 0);
if (!rbsp_buf)
return AVERROR(EINVAL);
if (rbsp_size < 13) {
av_freep(&rbsp_buf);
break;
}
/* skip sps_video_parameter_set_id u(4),
* sps_max_sub_layers_minus1 u(3),
* and sps_temporal_id_nesting_flag u(1)
*
* TIER represents the general_tier_flag, with 'L' indicating the flag is 0,
* and 'H' indicating the flag is 1
*/
tier = (rbsp_buf[1] & 0x20) == 0 ? 'L' : 'H';
profile = rbsp_buf[1] & 0x1f;
/* PROFILE_COMPATIBILITY is general_profile_compatibility_flags, but in reverse bit order,
* in a hexadecimal representation (leading zeroes may be omitted).
*/
profile_compatibility_flags = AV_RB32(rbsp_buf + 2);
/* revise these bits to get the profile compatibility value */
profile_compatibility_flags = ((profile_compatibility_flags & 0x55555555U) << 1) | ((profile_compatibility_flags >> 1) & 0x55555555U);
profile_compatibility_flags = ((profile_compatibility_flags & 0x33333333U) << 2) | ((profile_compatibility_flags >> 2) & 0x33333333U);
profile_compatibility_flags = ((profile_compatibility_flags & 0x0F0F0F0FU) << 4) | ((profile_compatibility_flags >> 4) & 0x0F0F0F0FU);
profile_compatibility_flags = ((profile_compatibility_flags & 0x00FF00FFU) << 8) | ((profile_compatibility_flags >> 8) & 0x00FF00FFU);
profile_compatibility = (profile_compatibility_flags << 16) | (profile_compatibility_flags >> 16);
/* skip 8 + 8 + 32
* CONSTRAINTS is a hexadecimal representation of the general_constraint_indicator_flags.
* each byte is separated by a '.', and trailing zero bytes may be omitted.
* drop the trailing zero bytes refer to ISO/IEC14496-15.
*/
high_nibble = rbsp_buf[7] >> 4;
snprintf(constraints, sizeof(constraints),
high_nibble ? "%02x.%x" : "%02x",
rbsp_buf[6], high_nibble);
/* skip 8 + 8 + 32 + 4 + 43 + 1 bit */
level = rbsp_buf[12];
av_freep(&rbsp_buf);
break;
}
data++;
}
if (par->codec_tag == MKTAG('h','v','c','1') &&
profile != AV_PROFILE_UNKNOWN &&
profile_compatibility != AV_PROFILE_UNKNOWN &&
tier != 0 &&
level != AV_LEVEL_UNKNOWN &&
constraints[0] != '\0') {
av_bprintf(out, "%s.%d.%x.%c%d.%s",
av_fourcc2str(par->codec_tag), profile,
profile_compatibility, tier, level, constraints);
} else
return AVERROR(EINVAL);
} else if (par->codec_id == AV_CODEC_ID_AV1) {
// https://aomediacodec.github.io/av1-isobmff/#codecsparam
AV1SequenceParameters seq;
int err;
if (!par->extradata_size)
return AVERROR(EINVAL);
if ((err = ff_av1_parse_seq_header(&seq, par->extradata, par->extradata_size)) < 0)
return err;
av_bprintf(out, "av01.%01u.%02u%s.%02u",
seq.profile, seq.level, seq.tier ? "H" : "M", seq.bitdepth);
if (seq.color_description_present_flag)
av_bprintf(out, ".%01u.%01u%01u%01u.%02u.%02u.%02u.%01u",
seq.monochrome,
seq.chroma_subsampling_x, seq.chroma_subsampling_y, seq.chroma_sample_position,
seq.color_primaries, seq.transfer_characteristics, seq.matrix_coefficients,
seq.color_range);
} else if (par->codec_id == AV_CODEC_ID_MPEG4) {
// RFC 6381
av_bprintf(out, "mp4v.20");
// Unimplemented, should output ProfileLevelIndication as a decimal number
av_log(logctx, AV_LOG_WARNING, "Incomplete RFC 6381 codec string for mp4v\n");
} else if (par->codec_id == AV_CODEC_ID_MP2) {
av_bprintf(out, "mp4a.40.33");
} else if (par->codec_id == AV_CODEC_ID_MP3) {
av_bprintf(out, "mp4a.40.34");
} else if (par->codec_id == AV_CODEC_ID_AAC) {
// RFC 6381
int aot = 2;
if (par->extradata_size >= 2) {
aot = par->extradata[0] >> 3;
if (aot == 31)
aot = ((AV_RB16(par->extradata) >> 5) & 0x3f) + 32;
} else if (par->profile != AV_PROFILE_UNKNOWN)
aot = par->profile + 1;
av_bprintf(out, "mp4a.40.%d", aot);
} else if (par->codec_id == AV_CODEC_ID_AC3) {
av_bprintf(out, "ac-3");
} else if (par->codec_id == AV_CODEC_ID_EAC3) {
av_bprintf(out, "ec-3");
} else {
return AVERROR(EINVAL);
}
return 0;
}
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