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avcodec/avs2_parser: parse more info

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Including video resolution, framerate and picture type, etc.

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
This commit is contained in:
Zhao Zhili 2022-06-13 11:36:34 +08:00 committed by Zhao Zhili
parent b7eee211bc
commit e0cddee277
4 changed files with 158 additions and 1 deletions
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2
libavcodec/Makefile
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@ -1114,7 +1114,7 @@ OBJS-$(CONFIG_AC3_PARSER) += aac_ac3_parser.o ac3tab.o \
OBJS-$(CONFIG_ADX_PARSER) += adx_parser.o adx.o
OBJS-$(CONFIG_AMR_PARSER) += amr_parser.o
OBJS-$(CONFIG_AV1_PARSER) += av1_parser.o
OBJS-$(CONFIG_AVS2_PARSER) += avs2_parser.o
OBJS-$(CONFIG_AVS2_PARSER) += avs2.o avs2_parser.o
OBJS-$(CONFIG_AVS3_PARSER) += avs3_parser.o
OBJS-$(CONFIG_BMP_PARSER) += bmp_parser.o
OBJS-$(CONFIG_CAVSVIDEO_PARSER) += cavs_parser.o

42
libavcodec/avs2.c Normal file
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@ -0,0 +1,42 @@
/*
* AVS2 related definitions
*
* Copyright (C) 2022 Zhao Zhili, <zhilizhao@tencent.com>
*
* 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 "avs2.h"
const AVRational ff_avs2_frame_rate_tab[16] = {
{ 0 , 0 }, // forbid
{ 24000, 1001},
{ 24 , 1 },
{ 25 , 1 },
{ 30000, 1001},
{ 30 , 1 },
{ 50 , 1 },
{ 60000, 1001},
{ 60 , 1 },
{ 100 , 1 },
{ 120 , 1 },
{ 200 , 1 },
{ 240 , 1 },
{ 300 , 1 },
{ 0 , 0 }, // reserved
{ 0 , 0 } // reserved
};

10
libavcodec/avs2.h
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@ -23,6 +23,8 @@
#ifndef AVCODEC_AVS2_H
#define AVCODEC_AVS2_H
#include "libavutil/rational.h"
#define AVS2_SLICE_MAX_START_CODE 0x000001AF
enum {
@ -38,4 +40,12 @@ enum {
#define AVS2_ISPIC(x) ((x) == AVS2_INTRA_PIC_START_CODE || (x) == AVS2_INTER_PIC_START_CODE)
#define AVS2_ISUNIT(x) ((x) == AVS2_SEQ_START_CODE || AVS2_ISPIC(x))
enum AVS2Profile {
AVS2_PROFILE_MAIN_PIC = 0x12,
AVS2_PROFILE_MAIN = 0x20,
AVS2_PROFILE_MAIN10 = 0x22,
};
extern const AVRational ff_avs2_frame_rate_tab[16];
#endif

105
libavcodec/avs2_parser.c
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@ -19,7 +19,9 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avutil.h"
#include "avs2.h"
#include "get_bits.h"
#include "parser.h"
static int avs2_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
@ -58,6 +60,107 @@ static int avs2_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_siz
return END_NOT_FOUND;
}
static void parse_avs2_seq_header(AVCodecParserContext *s, const uint8_t *buf,
int buf_size, AVCodecContext *avctx)
{
GetBitContext gb;
int profile, level;
int width, height;
int chroma, sample_precision, encoding_precision = 1;
// sample_precision and encoding_precision is 3 bits
static const uint8_t precision[8] = { 0, 8, 10 };
unsigned aspect_ratio;
unsigned frame_rate_code;
int low_delay;
// update buf_size_min if parse more deeper
const int buf_size_min = 15;
if (buf_size < buf_size_min)
return;
init_get_bits8(&gb, buf, buf_size_min);
s->key_frame = 1;
s->pict_type = AV_PICTURE_TYPE_I;
profile = get_bits(&gb, 8);
level = get_bits(&gb, 8);
// progressive_sequence u(1)
// field_coded_sequence u(1)
skip_bits(&gb, 2);
width = get_bits(&gb, 14);
height = get_bits(&gb, 14);
chroma = get_bits(&gb, 2);
sample_precision = get_bits(&gb, 3);
if (profile == AVS2_PROFILE_MAIN10)
encoding_precision = get_bits(&gb, 3);
aspect_ratio = get_bits(&gb, 4);
frame_rate_code = get_bits(&gb, 4);
// bit_rate_lower u(18)
// marker_bit f(1)
// bit_rate_upper u(12)
skip_bits(&gb, 31);
low_delay = get_bits(&gb, 1);
s->width = width;
s->height = height;
s->coded_width = FFALIGN(width, 8);
s->coded_height = FFALIGN(height, 8);
avctx->framerate.num = avctx->time_base.den =
ff_avs2_frame_rate_tab[frame_rate_code].num;
avctx->framerate.den = avctx->time_base.num =
ff_avs2_frame_rate_tab[frame_rate_code].den;
avctx->has_b_frames = FFMAX(avctx->has_b_frames, !low_delay);
av_log(avctx, AV_LOG_DEBUG,
"AVS2 parse seq HDR: profile %x, level %x, "
"width %d, height %d, "
"chroma %d, sample_precision %d bits, encoding_precision %d bits, "
"aspect_ratio 0x%x, framerate %d/%d, low_delay %d\n",
profile, level,
width, height,
chroma, precision[sample_precision], precision[encoding_precision],
aspect_ratio, avctx->framerate.num, avctx->framerate.den, low_delay);
}
static void parse_avs2_units(AVCodecParserContext *s, const uint8_t *buf,
int buf_size, AVCodecContext *avctx)
{
if (buf_size < 5)
return;
if (!(buf[0] == 0x0 && buf[1] == 0x0 && buf[2] == 0x1))
return;
switch (buf[3]) {
case AVS2_SEQ_START_CODE:
parse_avs2_seq_header(s, buf + 4, buf_size - 4, avctx);
return;
case AVS2_INTRA_PIC_START_CODE:
s->key_frame = 1;
s->pict_type = AV_PICTURE_TYPE_I;
return;
case AVS2_INTER_PIC_START_CODE:
s->key_frame = 0;
if (buf_size > 9) {
int pic_code_type = buf[8] & 0x3;
if (pic_code_type == 1)
s->pict_type = AV_PICTURE_TYPE_P;
else if (pic_code_type == 3)
s->pict_type = AV_PICTURE_TYPE_S;
else
s->pict_type = AV_PICTURE_TYPE_B;
}
return;
}
}
static int avs2_parse(AVCodecParserContext *s, AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
@ -76,6 +179,8 @@ static int avs2_parse(AVCodecParserContext *s, AVCodecContext *avctx,
}
}
parse_avs2_units(s, buf, buf_size, avctx);
*poutbuf = buf;
*poutbuf_size = buf_size;