219 lines
6.7 KiB
C
219 lines
6.7 KiB
C
/**
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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/get_bits.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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GetBitContext gb;
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AVRational timebase;
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init_get_bits(&gb, os->buf + os->pstart, os->psize * 8);
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/* 0x80"theora" */
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skip_bits_long(&gb, 7 * 8);
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thp->version = get_bits(&gb, 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 = get_bits(&gb, 16) << 4;
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st->codecpar->height = get_bits(&gb, 16) << 4;
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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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int width = get_bits(&gb, 24);
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int height = get_bits(&gb, 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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skip_bits(&gb, 16);
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}
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timebase.den = get_bits_long(&gb, 32);
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timebase.num = get_bits_long(&gb, 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 = get_bits(&gb, 24);
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st->sample_aspect_ratio.den = get_bits(&gb, 24);
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if (thp->version >= 0x030200)
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skip_bits_long(&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 = (1U << 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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av_log(s, AV_LOG_ERROR, "Unknown header type %X\n", os->buf[os->pstart]);
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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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memset(st->codecpar->extradata + cds, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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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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static int theora_packet(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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int duration;
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/* first packet handling
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here we parse the duration of each packet in the first page and compare
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the total duration to the page granule to find the encoder delay and
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set the first timestamp */
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if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
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int seg;
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int64_t pts;
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duration = 1;
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for (seg = os->segp; seg < os->nsegs; seg++) {
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if (os->segments[seg] < 255)
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duration ++;
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}
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pts = theora_gptopts(s, idx, os->granule, NULL);
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if (pts != AV_NOPTS_VALUE)
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pts = av_sat_sub64(pts, duration);
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os->lastpts = os->lastdts = pts;
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if(s->streams[idx]->start_time == AV_NOPTS_VALUE && os->lastpts != AV_NOPTS_VALUE) {
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s->streams[idx]->start_time = os->lastpts;
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if (s->streams[idx]->duration > 0)
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s->streams[idx]->duration -= s->streams[idx]->start_time;
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}
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}
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/* parse packet duration */
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if (os->psize > 0) {
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os->pduration = 1;
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}
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return 0;
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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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.packet = theora_packet,
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.gptopts = theora_gptopts,
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.nb_header = 3,
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};
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