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177 lines
5.4 KiB
177 lines
5.4 KiB
/** |
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* Copyright (C) 2005 Matthieu CASTET, Alex Beregszaszi |
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* |
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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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* |
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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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* |
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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/bitstream.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "oggdec.h" |
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typedef struct TheoraParams { |
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int gpshift; |
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int gpmask; |
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unsigned version; |
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} TheoraParams; |
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static int 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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TheoraParams *thp = os->private; |
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int cds = st->codecpar->extradata_size + os->psize + 2; |
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int err; |
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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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if (!thp) |
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return AVERROR(ENOMEM); |
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os->private = thp; |
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} |
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switch (os->buf[os->pstart]) { |
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case 0x80: { |
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BitstreamContext bc; |
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AVRational timebase; |
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bitstream_init(&bc, os->buf + os->pstart, os->psize * 8); |
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/* 0x80"theora" */ |
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bitstream_skip(&bc, 7 * 8); |
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thp->version = bitstream_read(&bc, 24); |
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if (thp->version < 0x030100) { |
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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 AVERROR(ENOSYS); |
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} |
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st->codecpar->width = bitstream_read(&bc, 16) << 4; |
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st->codecpar->height = bitstream_read(&bc, 16) << 4; |
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if (thp->version >= 0x030400) |
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bitstream_skip(&bc, 100); |
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if (thp->version >= 0x030200) { |
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int width = bitstream_read(&bc, 24); |
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int height = bitstream_read(&bc, 24); |
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if (width <= st->codecpar->width && width > st->codecpar->width - 16 && |
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height <= st->codecpar->height && height > st->codecpar->height - 16) { |
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st->codecpar->width = width; |
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st->codecpar->height = height; |
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} |
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bitstream_skip(&bc, 16); |
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} |
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timebase.den = bitstream_read(&bc, 32); |
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timebase.num = bitstream_read(&bc, 32); |
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if (!(timebase.num > 0 && timebase.den > 0)) { |
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av_log(s, AV_LOG_WARNING, "Invalid time base in theora stream, assuming 25 FPS\n"); |
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timebase.num = 1; |
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timebase.den = 25; |
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} |
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avpriv_set_pts_info(st, 64, timebase.num, timebase.den); |
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st->sample_aspect_ratio.num = bitstream_read(&bc, 24); |
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st->sample_aspect_ratio.den = bitstream_read(&bc, 24); |
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if (thp->version >= 0x030200) |
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bitstream_skip(&bc, 38); |
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if (thp->version >= 0x304000) |
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bitstream_skip(&bc, 2); |
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thp->gpshift = bitstream_read(&bc, 5); |
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thp->gpmask = (1 << thp->gpshift) - 1; |
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codecpar->codec_id = AV_CODEC_ID_THEORA; |
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st->need_parsing = AVSTREAM_PARSE_HEADERS; |
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} |
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break; |
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case 0x81: |
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ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 7, os->psize - 7); |
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case 0x82: |
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if (!thp->version) |
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return AVERROR_INVALIDDATA; |
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break; |
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default: |
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return AVERROR_INVALIDDATA; |
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} |
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if ((err = av_reallocp(&st->codecpar->extradata, |
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cds + AV_INPUT_BUFFER_PADDING_SIZE)) < 0) { |
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st->codecpar->extradata_size = 0; |
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return err; |
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} |
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cdp = st->codecpar->extradata + st->codecpar->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->codecpar->extradata_size = cds; |
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return 1; |
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} |
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static uint64_t theora_gptopts(AVFormatContext *ctx, int idx, uint64_t gp, |
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int64_t *dts) |
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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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TheoraParams *thp = os->private; |
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uint64_t iframe, pframe; |
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if (!thp) |
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return AV_NOPTS_VALUE; |
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iframe = gp >> thp->gpshift; |
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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 |= AV_PKT_FLAG_KEY; |
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if (dts) |
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*dts = iframe + pframe; |
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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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.nb_header = 3, |
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};
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