mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
115 lines
3.6 KiB
115 lines
3.6 KiB
/** |
|
Copyright (C) 2005 Matthieu CASTET |
|
|
|
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; |
|
init_get_bits(&gb, os->buf + os->pstart, os->psize*8); |
|
|
|
skip_bits(&gb, 7*8); /* 0x80"theora" */ |
|
if(get_bits(&gb, 8) != 3) /* major version */ |
|
return -1; |
|
if(get_bits(&gb, 8) != 2) /* minor version */ |
|
return -1; |
|
skip_bits(&gb, 8); /* revision */ |
|
|
|
st->codec.width = get_bits(&gb, 16) << 4; |
|
st->codec.height = get_bits(&gb, 16) << 4; |
|
|
|
skip_bits(&gb, 64); |
|
st->codec.time_base.den = get_bits(&gb, 32); |
|
st->codec.time_base.num = get_bits(&gb, 32); |
|
|
|
st->codec.sample_aspect_ratio.num = get_bits(&gb, 24); |
|
st->codec.sample_aspect_ratio.den = get_bits(&gb, 24); |
|
|
|
skip_bits(&gb, 38); |
|
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) |
|
{ |
|
AVStream *st = ctx->streams[idx]; |
|
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) * AV_TIME_BASE * st->codec.time_base.num / |
|
st->codec.time_base.den; |
|
} |
|
|
|
ogg_codec_t theora_codec = { |
|
.magic = "\200theora", |
|
.magicsize = 7, |
|
.header = theora_header, |
|
.gptopts = theora_gptopts |
|
};
|
|
|