mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 4217 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
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/**
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Copyright (C) 2005 Matthieu CASTET |
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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 "avformat.h" |
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#include "bitstream.h" |
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#include "bswap.h" |
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#include "ogg2.h" |
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typedef struct theora_params { |
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int gpshift; |
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int gpmask; |
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} theora_params_t; |
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static int |
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theora_header (AVFormatContext * s, int idx) |
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{ |
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ogg_t *ogg = s->priv_data; |
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ogg_stream_t *os = ogg->streams + idx; |
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AVStream *st = s->streams[idx]; |
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theora_params_t *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->seq > 2) |
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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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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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skip_bits(&gb, 3*8); |
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st->codec.width = get_bits(&gb, 16) << 4; |
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st->codec.height = get_bits(&gb, 16) << 4; |
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skip_bits(&gb, 64); |
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st->codec.time_base.den = get_bits(&gb, 32); |
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st->codec.time_base.num = get_bits(&gb, 32); |
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st->codec.sample_aspect_ratio.num = get_bits(&gb, 24); |
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st->codec.sample_aspect_ratio.den = get_bits(&gb, 24); |
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skip_bits(&gb, 38); |
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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 os->seq < 3; |
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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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AVStream *st = ctx->streams[idx]; |
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ogg_t *ogg = ctx->priv_data; |
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ogg_stream_t *os = ogg->streams + idx; |
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theora_params_t *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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return (iframe + pframe) * AV_TIME_BASE * st->codec.time_base.num / |
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st->codec.time_base.den; |
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} |
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ogg_codec_t 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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