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/*
* 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 "avcodec.h"
#include "ffv1.h"
#include "rangecoder.h"
typedef struct FFV1ParseContext {
FFV1Context f;
int got_first;
} FFV1ParseContext;
static int parse(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
FFV1ParseContext *p = s->priv_data;
FFV1Context *f = &p->f;
RangeCoder c;
uint8_t keystate = 128;
*poutbuf = buf;
*poutbuf_size = buf_size;
if (!p->got_first) {
int ret = ff_ffv1_common_init(avctx, f);
p->got_first = 1;
if (ret < 0)
return buf_size;
if (avctx->extradata_size > 0 && (ret = ff_ffv1_read_extra_header(f)) < 0)
return buf_size;
}
ff_init_range_decoder(&c, buf, buf_size);
ff_build_rac_states(&c, 0.05 * (1LL << 32), 256 - 8);
f->avctx = avctx;
s->key_frame = get_rac(&c, &keystate);
s->pict_type = AV_PICTURE_TYPE_I;
s->field_order = AV_FIELD_UNKNOWN;
s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN;
if (s->key_frame) {
uint8_t state[CONTEXT_SIZE];
memset(state, 128, sizeof(state));
ff_ffv1_parse_header(f, &c, state);
}
s->width = f->width;
s->height = f->height;
s->format = f->pix_fmt;
return buf_size;
}
static void ffv1_close(AVCodecParserContext *s)
{
FFV1ParseContext *p = s->priv_data;
p->f.avctx = NULL;
ff_ffv1_close(&p->f);
}
const AVCodecParser ff_ffv1_parser = {
.codec_ids = { AV_CODEC_ID_FFV1 },
.priv_data_size = sizeof(FFV1ParseContext),
.parser_parse = parse,
.parser_close = ffv1_close,
};
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