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/**
* 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 "libavutil/bswap.h"
#include "libavcodec/bitstream.h"
#include "avformat.h"
#include "internal.h"
#include "oggdec.h"
typedef struct TheoraParams {
int gpshift;
int gpmask;
unsigned version;
} TheoraParams;
static int theora_header(AVFormatContext *s, int idx)
{
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
AVStream *st = s->streams[idx];
TheoraParams *thp = os->private;
int cds = st->codecpar->extradata_size + os->psize + 2;
int err;
uint8_t *cdp;
if (!(os->buf[os->pstart] & 0x80))
return 0;
if (!thp) {
thp = av_mallocz(sizeof(*thp));
if (!thp)
return AVERROR(ENOMEM);
os->private = thp;
}
switch (os->buf[os->pstart]) {
case 0x80: {
BitstreamContext bc;
AVRational timebase;
bitstream_init(&bc, os->buf + os->pstart, os->psize * 8);
/* 0x80"theora" */
bitstream_skip(&bc, 7 * 8);
thp->version = bitstream_read(&bc, 24);
if (thp->version < 0x030100) {
av_log(s, AV_LOG_ERROR,
"Too old or unsupported Theora (%x)\n", thp->version);
return AVERROR(ENOSYS);
}
st->codecpar->width = bitstream_read(&bc, 16) << 4;
st->codecpar->height = bitstream_read(&bc, 16) << 4;
if (thp->version >= 0x030400)
bitstream_skip(&bc, 100);
if (thp->version >= 0x030200) {
int width = bitstream_read(&bc, 24);
int height = bitstream_read(&bc, 24);
if (width <= st->codecpar->width && width > st->codecpar->width - 16 &&
height <= st->codecpar->height && height > st->codecpar->height - 16) {
st->codecpar->width = width;
st->codecpar->height = height;
}
bitstream_skip(&bc, 16);
}
timebase.den = bitstream_read(&bc, 32);
timebase.num = bitstream_read(&bc, 32);
if (!(timebase.num > 0 && timebase.den > 0)) {
av_log(s, AV_LOG_WARNING, "Invalid time base in theora stream, assuming 25 FPS\n");
timebase.num = 1;
timebase.den = 25;
}
avpriv_set_pts_info(st, 64, timebase.num, timebase.den);
st->sample_aspect_ratio.num = bitstream_read(&bc, 24);
st->sample_aspect_ratio.den = bitstream_read(&bc, 24);
if (thp->version >= 0x030200)
bitstream_skip(&bc, 38);
if (thp->version >= 0x304000)
bitstream_skip(&bc, 2);
thp->gpshift = bitstream_read(&bc, 5);
thp->gpmask = (1 << thp->gpshift) - 1;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_THEORA;
st->need_parsing = AVSTREAM_PARSE_HEADERS;
}
break;
case 0x81:
ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 7, os->psize - 7);
case 0x82:
if (!thp->version)
return AVERROR_INVALIDDATA;
break;
default:
return AVERROR_INVALIDDATA;
}
if ((err = av_reallocp(&st->codecpar->extradata,
cds + AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
st->codecpar->extradata_size = 0;
return err;
}
cdp = st->codecpar->extradata + st->codecpar->extradata_size;
*cdp++ = os->psize >> 8;
*cdp++ = os->psize & 0xff;
memcpy(cdp, os->buf + os->pstart, os->psize);
st->codecpar->extradata_size = cds;
return 1;
}
static uint64_t theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp,
int64_t *dts)
{
struct ogg *ogg = ctx->priv_data;
struct ogg_stream *os = ogg->streams + idx;
TheoraParams *thp = os->private;
uint64_t iframe, pframe;
if (!thp)
return AV_NOPTS_VALUE;
iframe = gp >> thp->gpshift;
pframe = gp & thp->gpmask;
if (thp->version < 0x030201)
iframe++;
if (!pframe)
os->pflags |= AV_PKT_FLAG_KEY;
if (dts)
*dts = iframe + pframe;
return iframe + pframe;
}
const struct ogg_codec ff_theora_codec = {
.magic = "\200theora",
.magicsize = 7,
.header = theora_header,
.gptopts = theora_gptopts,
.nb_header = 3,
};
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