From 1ed923eab332bf55fd18603ed7b66432142ded67 Mon Sep 17 00:00:00 2001 From: Måns Rullgård Date: Wed, 11 May 2005 16:38:34 +0000 Subject: support theora in ogg, plus required ogg core changes Originally committed as revision 4217 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/oggparsetheora.c | 112 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 112 insertions(+) create mode 100644 libavformat/oggparsetheora.c (limited to 'libavformat/oggparsetheora.c') diff --git a/libavformat/oggparsetheora.c b/libavformat/oggparsetheora.c new file mode 100644 index 0000000000..3ca5d91da8 --- /dev/null +++ b/libavformat/oggparsetheora.c @@ -0,0 +1,112 @@ +/** + 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 +#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->seq > 2) + 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" */ + skip_bits(&gb, 3*8); + + 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 os->seq < 3; +} + +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 +}; -- cgit v1.2.3