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avcodec: add Micronas SC-4 parser

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Paul B Mahol
2022-09-09 09:57:12 +02:00
parent ea93943bee
commit e91bc521af
3 changed files with 83 additions and 0 deletions
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1
libavcodec/Makefile
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@@ -1143,6 +1143,7 @@ OBJS-$(CONFIG_HEVC_PARSER) += hevc_parser.o hevc_data.o
OBJS-$(CONFIG_HDR_PARSER) += hdr_parser.o
OBJS-$(CONFIG_IPU_PARSER) += ipu_parser.o
OBJS-$(CONFIG_JPEG2000_PARSER) += jpeg2000_parser.o
OBJS-$(CONFIG_MISC4_PARSER) += misc4_parser.o
OBJS-$(CONFIG_MJPEG_PARSER) += mjpeg_parser.o
OBJS-$(CONFIG_MLP_PARSER) += mlp_parse.o mlp_parser.o mlp.o
OBJS-$(CONFIG_MPEG4VIDEO_PARSER) += mpeg4video_parser.o h263.o \

81
libavcodec/misc4_parser.c Normal file
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@@ -0,0 +1,81 @@
/*
* Micronas SC-4 parser
*
* 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 "parser.h"
typedef struct MISC4Context {
ParseContext pc;
} MISC4Context;
static int misc4_parse(AVCodecParserContext *s, AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
MISC4Context *ctx = s->priv_data;
uint32_t state = ctx->pc.state;
int next = END_NOT_FOUND, i = 0;
*poutbuf_size = 0;
*poutbuf = NULL;
if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
next = buf_size;
} else {
uint32_t marker = 0;
switch (avctx->sample_rate) {
case 8000:
case 11025:
marker = 0x11b;
break;
case 16000:
case 32000:
marker = 0x2b2;
break;
}
for (; i < buf_size; i++) {
state = (state << 8) | buf[i];
if (state == marker && i > 3) {
next = i - 3;
break;
}
}
ctx->pc.state = state;
if (ff_combine_frame(&ctx->pc, next, &buf, &buf_size) < 0) {
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
}
*poutbuf = buf;
*poutbuf_size = buf_size;
return next;
}
const AVCodecParser ff_misc4_parser = {
.codec_ids = { AV_CODEC_ID_MISC4 },
.priv_data_size = sizeof(MISC4Context),
.parser_parse = misc4_parse,
.parser_close = ff_parse_close,
};

1
libavcodec/parsers.c
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@@ -53,6 +53,7 @@ extern const AVCodecParser ff_hevc_parser;
extern const AVCodecParser ff_hdr_parser;
extern const AVCodecParser ff_ipu_parser;
extern const AVCodecParser ff_jpeg2000_parser;
extern const AVCodecParser ff_misc4_parser;
extern const AVCodecParser ff_mjpeg_parser;
extern const AVCodecParser ff_mlp_parser;
extern const AVCodecParser ff_mpeg4video_parser;