mirror of
https://git.ffmpeg.org/ffmpeg.git
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143 lines
4.4 KiB
C
143 lines
4.4 KiB
C
/**
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Copyright (C) 2005 Matthieu CASTET, Alex Beregszaszi
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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**/
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#include <stdlib.h>
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#include "libavutil/bswap.h"
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#include "libavcodec/get_bits.h"
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#include "avformat.h"
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#include "oggdec.h"
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struct theora_params {
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int gpshift;
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int gpmask;
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unsigned version;
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};
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static int
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theora_header (AVFormatContext * s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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AVStream *st = s->streams[idx];
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struct theora_params *thp = os->private;
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int cds = st->codec->extradata_size + os->psize + 2;
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uint8_t *cdp;
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if(!(os->buf[os->pstart] & 0x80))
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return 0;
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if(!thp){
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thp = av_mallocz(sizeof(*thp));
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os->private = thp;
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}
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if (os->buf[os->pstart] == 0x80) {
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GetBitContext gb;
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int width, height;
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init_get_bits(&gb, os->buf + os->pstart, os->psize*8);
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skip_bits(&gb, 7*8); /* 0x80"theora" */
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thp->version = get_bits_long(&gb, 24);
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if (thp->version < 0x030100)
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{
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av_log(s, AV_LOG_ERROR,
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"Too old or unsupported Theora (%x)\n", thp->version);
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return -1;
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}
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width = get_bits(&gb, 16) << 4;
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height = get_bits(&gb, 16) << 4;
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avcodec_set_dimensions(st->codec, width, height);
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if (thp->version >= 0x030400)
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skip_bits(&gb, 100);
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if (thp->version >= 0x030200) {
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width = get_bits_long(&gb, 24);
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height = get_bits_long(&gb, 24);
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if ( width <= st->codec->width && width > st->codec->width-16
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&& height <= st->codec->height && height > st->codec->height-16)
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avcodec_set_dimensions(st->codec, width, height);
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skip_bits(&gb, 16);
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}
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st->codec->time_base.den = get_bits_long(&gb, 32);
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st->codec->time_base.num = get_bits_long(&gb, 32);
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st->time_base = st->codec->time_base;
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st->sample_aspect_ratio.num = get_bits_long(&gb, 24);
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st->sample_aspect_ratio.den = get_bits_long(&gb, 24);
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if (thp->version >= 0x030200)
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skip_bits(&gb, 38);
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if (thp->version >= 0x304000)
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skip_bits(&gb, 2);
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thp->gpshift = get_bits(&gb, 5);
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thp->gpmask = (1 << thp->gpshift) - 1;
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st->codec->codec_type = CODEC_TYPE_VIDEO;
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st->codec->codec_id = CODEC_ID_THEORA;
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} else if (os->buf[os->pstart] == 0x83) {
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vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
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}
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st->codec->extradata = av_realloc (st->codec->extradata, cds);
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cdp = st->codec->extradata + st->codec->extradata_size;
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*cdp++ = os->psize >> 8;
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*cdp++ = os->psize & 0xff;
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memcpy (cdp, os->buf + os->pstart, os->psize);
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st->codec->extradata_size = cds;
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return 1;
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}
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static uint64_t
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theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp)
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{
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struct ogg *ogg = ctx->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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struct theora_params *thp = os->private;
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uint64_t iframe = gp >> thp->gpshift;
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uint64_t pframe = gp & thp->gpmask;
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if (thp->version < 0x030201)
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iframe++;
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if(!pframe)
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os->pflags |= PKT_FLAG_KEY;
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return iframe + pframe;
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}
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const struct ogg_codec ff_theora_codec = {
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.magic = "\200theora",
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.magicsize = 7,
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.header = theora_header,
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.gptopts = theora_gptopts
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};
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