mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 20:19:55 +00:00
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/**
|
|
Copyright (C) 2005 Matthieu CASTET, Alex Beregszaszi
|
|
|
|
Permission is hereby granted, free of charge, to any person
|
|
obtaining a copy of this software and associated documentation
|
|
files (the "Software"), to deal in the Software without
|
|
restriction, including without limitation the rights to use, copy,
|
|
modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be
|
|
included in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
DEALINGS IN THE SOFTWARE.
|
|
**/
|
|
|
|
#include <stdlib.h>
|
|
#include "avformat.h"
|
|
#include "bitstream.h"
|
|
#include "bswap.h"
|
|
#include "ogg2.h"
|
|
|
|
typedef struct theora_params {
|
|
int gpshift;
|
|
int gpmask;
|
|
} theora_params_t;
|
|
|
|
static int
|
|
theora_header (AVFormatContext * s, int idx)
|
|
{
|
|
ogg_t *ogg = s->priv_data;
|
|
ogg_stream_t *os = ogg->streams + idx;
|
|
AVStream *st = s->streams[idx];
|
|
theora_params_t *thp = os->private;
|
|
int cds = st->codec->extradata_size + os->psize + 2;
|
|
uint8_t *cdp;
|
|
|
|
if(!(os->buf[os->pstart] & 0x80))
|
|
return 0;
|
|
|
|
if(!thp){
|
|
thp = av_mallocz(sizeof(*thp));
|
|
os->private = thp;
|
|
}
|
|
|
|
if (os->buf[os->pstart] == 0x80) {
|
|
GetBitContext gb;
|
|
int version;
|
|
|
|
init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
|
|
|
|
skip_bits(&gb, 7*8); /* 0x80"theora" */
|
|
|
|
version = get_bits(&gb, 8) << 16;
|
|
version |= get_bits(&gb, 8) << 8;
|
|
version |= get_bits(&gb, 8);
|
|
|
|
if (version < 0x030100)
|
|
{
|
|
av_log(s, AV_LOG_ERROR,
|
|
"Too old or unsupported Theora (%x)\n", version);
|
|
return -1;
|
|
}
|
|
|
|
st->codec->width = get_bits(&gb, 16) << 4;
|
|
st->codec->height = get_bits(&gb, 16) << 4;
|
|
|
|
if (version >= 0x030400)
|
|
skip_bits(&gb, 164);
|
|
else if (version >= 0x030200)
|
|
skip_bits(&gb, 64);
|
|
st->codec->time_base.den = get_bits(&gb, 32);
|
|
st->codec->time_base.num = get_bits(&gb, 32);
|
|
st->time_base = st->codec->time_base;
|
|
|
|
st->codec->sample_aspect_ratio.num = get_bits(&gb, 24);
|
|
st->codec->sample_aspect_ratio.den = get_bits(&gb, 24);
|
|
|
|
if (version >= 0x030200)
|
|
skip_bits(&gb, 38);
|
|
if (version >= 0x304000)
|
|
skip_bits(&gb, 2);
|
|
|
|
thp->gpshift = get_bits(&gb, 5);
|
|
thp->gpmask = (1 << thp->gpshift) - 1;
|
|
|
|
st->codec->codec_type = CODEC_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_THEORA;
|
|
|
|
} else if (os->buf[os->pstart] == 0x83) {
|
|
vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
|
|
}
|
|
|
|
st->codec->extradata = av_realloc (st->codec->extradata, cds);
|
|
cdp = st->codec->extradata + st->codec->extradata_size;
|
|
*cdp++ = os->psize >> 8;
|
|
*cdp++ = os->psize & 0xff;
|
|
memcpy (cdp, os->buf + os->pstart, os->psize);
|
|
st->codec->extradata_size = cds;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static uint64_t
|
|
theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp)
|
|
{
|
|
ogg_t *ogg = ctx->priv_data;
|
|
ogg_stream_t *os = ogg->streams + idx;
|
|
theora_params_t *thp = os->private;
|
|
uint64_t iframe = gp >> thp->gpshift;
|
|
uint64_t pframe = gp & thp->gpmask;
|
|
|
|
return iframe + pframe;
|
|
}
|
|
|
|
ogg_codec_t theora_codec = {
|
|
.magic = "\200theora",
|
|
.magicsize = 7,
|
|
.header = theora_header,
|
|
.gptopts = theora_gptopts
|
|
};
|