mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
bb270c0896
Originally committed as revision 4764 to svn://svn.ffmpeg.org/ffmpeg/trunk
659 lines
14 KiB
C
659 lines
14 KiB
C
/*
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* Ogg bitstream support
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* Luca Barbato <lu_zero@gentoo.org>
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* Based on tcvp implementation
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*
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*/
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/**
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Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
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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 <stdio.h>
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#include "ogg2.h"
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#include "avformat.h"
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#define MAX_PAGE_SIZE 65307
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#define DECODER_BUFFER_SIZE MAX_PAGE_SIZE
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static ogg_codec_t *ogg_codecs[] = {
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&vorbis_codec,
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&theora_codec,
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&flac_codec,
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NULL
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};
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#if 0 // CONFIG_MUXERS
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static int
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ogg_write_header (AVFormatContext * avfcontext)
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{
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}
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static int
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ogg_write_packet (AVFormatContext * avfcontext, AVPacket * pkt)
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{
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}
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static int
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ogg_write_trailer (AVFormatContext * avfcontext)
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{
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}
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static AVOutputFormat ogg_oformat = {
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"ogg",
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"Ogg Vorbis",
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"audio/x-vorbis",
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"ogg",
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sizeof (OggContext),
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CODEC_ID_VORBIS,
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0,
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ogg_write_header,
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ogg_write_packet,
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ogg_write_trailer,
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};
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#endif //CONFIG_MUXERS
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//FIXME We could avoid some structure duplication
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static int
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ogg_save (AVFormatContext * s)
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{
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ogg_t *ogg = s->priv_data;
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ogg_state_t *ost =
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av_malloc(sizeof (*ost) + (ogg->nstreams-1) * sizeof (*ogg->streams));
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int i;
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ost->pos = url_ftell (&s->pb);;
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ost->curidx = ogg->curidx;
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ost->next = ogg->state;
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memcpy(ost->streams, ogg->streams, ogg->nstreams * sizeof(*ogg->streams));
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for (i = 0; i < ogg->nstreams; i++){
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ogg_stream_t *os = ogg->streams + i;
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os->buf = av_malloc (os->bufsize);
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memset (os->buf, 0, os->bufsize);
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memcpy (os->buf, ost->streams[i].buf, os->bufpos);
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}
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ogg->state = ost;
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return 0;
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}
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static int
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ogg_restore (AVFormatContext * s, int discard)
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{
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ogg_t *ogg = s->priv_data;
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ByteIOContext *bc = &s->pb;
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ogg_state_t *ost = ogg->state;
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int i;
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if (!ost)
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return 0;
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ogg->state = ost->next;
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if (!discard){
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for (i = 0; i < ogg->nstreams; i++)
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av_free (ogg->streams[i].buf);
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url_fseek (bc, ost->pos, SEEK_SET);
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ogg->curidx = ost->curidx;
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memcpy (ogg->streams, ost->streams,
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ogg->nstreams * sizeof (*ogg->streams));
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}
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av_free (ost);
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return 0;
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}
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static int
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ogg_reset (ogg_t * ogg)
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{
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int i;
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for (i = 0; i < ogg->nstreams; i++){
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ogg_stream_t *os = ogg->streams + i;
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os->bufpos = 0;
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os->pstart = 0;
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os->psize = 0;
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os->granule = -1;
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os->lastgp = -1;
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os->nsegs = 0;
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os->segp = 0;
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}
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ogg->curidx = -1;
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return 0;
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}
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static ogg_codec_t *
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ogg_find_codec (uint8_t * buf, int size)
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{
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int i;
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for (i = 0; ogg_codecs[i]; i++)
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if (size >= ogg_codecs[i]->magicsize &&
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!memcmp (buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize))
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return ogg_codecs[i];
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return NULL;
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}
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static int
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ogg_find_stream (ogg_t * ogg, int serial)
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{
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int i;
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for (i = 0; i < ogg->nstreams; i++)
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if (ogg->streams[i].serial == serial)
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return i;
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return -1;
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}
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static int
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ogg_new_stream (AVFormatContext * s, uint32_t serial)
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{
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ogg_t *ogg = s->priv_data;
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int idx = ogg->nstreams++;
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AVStream *st;
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ogg_stream_t *os;
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ogg->streams = av_realloc (ogg->streams,
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ogg->nstreams * sizeof (*ogg->streams));
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memset (ogg->streams + idx, 0, sizeof (*ogg->streams));
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os = ogg->streams + idx;
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os->serial = serial;
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os->bufsize = DECODER_BUFFER_SIZE;
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os->buf = av_malloc (os->bufsize);
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memset (os->buf, 0, os->bufsize);
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os->header = -1;
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st = av_new_stream (s, idx);
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if (!st)
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return AVERROR_NOMEM;
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av_set_pts_info(st, 64, 1, 1000000);
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st->start_time = 0;
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return idx;
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}
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static int
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ogg_read_page (AVFormatContext * s, int *str)
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{
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ByteIOContext *bc = &s->pb;
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ogg_t *ogg = s->priv_data;
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ogg_stream_t *os;
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int i = 0;
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int flags, nsegs;
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uint64_t gp;
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uint32_t serial;
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uint32_t seq;
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uint32_t crc;
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int size, idx;
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char sync[4];
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int sp = 0;
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if (get_buffer (bc, sync, 4) < 4)
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return -1;
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do{
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int c;
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if (sync[sp & 3] == 'O' &&
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sync[(sp + 1) & 3] == 'g' &&
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sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S')
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break;
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c = url_fgetc (bc);
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if (c < 0)
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return -1;
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sync[sp++ & 3] = c;
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}while (i++ < MAX_PAGE_SIZE);
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if (i >= MAX_PAGE_SIZE){
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av_log (s, AV_LOG_INFO, "ogg, can't find sync word\n");
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return -1;
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}
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if (url_fgetc (bc) != 0) /* version */
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return -1;
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flags = url_fgetc (bc);
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gp = get_le64 (bc);
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serial = get_le32 (bc);
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seq = get_le32 (bc);
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crc = get_le32 (bc);
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nsegs = url_fgetc (bc);
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idx = ogg_find_stream (ogg, serial);
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if (idx < 0){
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idx = ogg_new_stream (s, serial);
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if (idx < 0)
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return -1;
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}
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os = ogg->streams + idx;
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if (get_buffer (bc, os->segments, nsegs) < nsegs)
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return -1;
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os->nsegs = nsegs;
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os->segp = 0;
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size = 0;
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for (i = 0; i < nsegs; i++)
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size += os->segments[i];
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if (flags & OGG_FLAG_CONT){
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if (!os->psize){
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while (os->segp < os->nsegs){
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int seg = os->segments[os->segp++];
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os->pstart += seg;
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if (seg < 255)
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break;
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}
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}
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}else{
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os->psize = 0;
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}
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if (os->bufsize - os->bufpos < size){
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uint8_t *nb = av_malloc (os->bufsize *= 2);
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memset (nb, 0, os->bufsize);
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memcpy (nb, os->buf, os->bufpos);
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av_free (os->buf);
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os->buf = nb;
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}
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if (get_buffer (bc, os->buf + os->bufpos, size) < size)
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return -1;
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os->lastgp = os->granule;
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os->bufpos += size;
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os->granule = gp;
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os->flags = flags;
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if (str)
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*str = idx;
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return 0;
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}
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static int
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ogg_packet (AVFormatContext * s, int *str)
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{
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ogg_t *ogg = s->priv_data;
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int idx;
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ogg_stream_t *os;
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int complete = 0;
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int segp = 0, psize = 0;
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#if 0
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av_log (s, AV_LOG_DEBUG, "ogg_packet: curidx=%i\n", ogg->curidx);
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#endif
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do{
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idx = ogg->curidx;
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while (idx < 0){
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if (ogg_read_page (s, &idx) < 0)
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return -1;
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}
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os = ogg->streams + idx;
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#if 0
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av_log (s, AV_LOG_DEBUG,
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"ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
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idx, os->pstart, os->psize, os->segp, os->nsegs);
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#endif
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if (!os->codec){
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if (os->header < 0){
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os->codec = ogg_find_codec (os->buf, os->bufpos);
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if (!os->codec){
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os->header = 0;
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return 0;
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}
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}else{
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return 0;
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}
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}
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segp = os->segp;
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psize = os->psize;
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while (os->segp < os->nsegs){
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int ss = os->segments[os->segp++];
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os->psize += ss;
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if (ss < 255){
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complete = 1;
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break;
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}
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}
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if (!complete && os->segp == os->nsegs){
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uint8_t *nb = av_malloc (os->bufsize);
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int size = os->bufpos - os->pstart;
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memset (nb, 0, os->bufsize);
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memcpy (nb, os->buf + os->pstart, size);
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av_free (os->buf);
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os->buf = nb;
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os->bufpos = size;
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os->pstart = 0;
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ogg->curidx = -1;
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}
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}while (!complete);
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#if 0
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av_log (s, AV_LOG_DEBUG,
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"ogg_packet: idx %i, frame size %i, start %i\n",
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idx, os->psize, os->pstart);
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#endif
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ogg->curidx = idx;
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if (os->header < 0){
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int hdr = os->codec->header (s, idx);
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if (!hdr){
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os->header = os->seq;
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os->segp = segp;
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os->psize = psize;
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ogg->headers = 1;
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}else{
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os->pstart += os->psize;
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os->psize = 0;
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}
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}
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if (os->header > -1 && os->seq > os->header){
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if (os->codec && os->codec->packet)
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os->codec->packet (s, idx);
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if (str)
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*str = idx;
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}
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os->seq++;
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if (os->segp == os->nsegs)
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ogg->curidx = -1;
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return 0;
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}
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static int
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ogg_get_headers (AVFormatContext * s)
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{
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ogg_t *ogg = s->priv_data;
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do{
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if (ogg_packet (s, NULL) < 0)
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return -1;
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}while (!ogg->headers);
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#if 0
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av_log (s, AV_LOG_DEBUG, "found headers\n");
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#endif
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return 0;
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}
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static uint64_t
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ogg_gptopts (AVFormatContext * s, int i, uint64_t gp)
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{
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ogg_t *ogg = s->priv_data;
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ogg_stream_t *os = ogg->streams + i;
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AVStream *st = s->streams[i];
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AVCodecContext *codec = st->codec;
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uint64_t pts = AV_NOPTS_VALUE;
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if(os->codec->gptopts){
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pts = os->codec->gptopts(s, i, gp);
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} else if (codec->codec_type == CODEC_TYPE_AUDIO){
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pts = gp * 1000000LL / codec->sample_rate;
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}else if (codec->codec_type == CODEC_TYPE_VIDEO){
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pts = gp;
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}
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return pts;
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}
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static int
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ogg_get_length (AVFormatContext * s)
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{
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ogg_t *ogg = s->priv_data;
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int idx = -1, i;
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if(s->pb.is_streamed)
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return 0;
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// already set
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if (s->duration != AV_NOPTS_VALUE)
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return 0;
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ogg_save (s);
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url_fseek (&s->pb, -MAX_PAGE_SIZE, SEEK_END);
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while (!ogg_read_page (s, &i)){
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if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0)
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idx = i;
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}
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if (idx != -1){
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s->streams[idx]->duration =
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ogg_gptopts (s, idx, ogg->streams[idx].granule);
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}
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ogg->size = url_fsize(&s->pb);
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ogg_restore (s, 0);
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return 0;
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}
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static int
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ogg_read_header (AVFormatContext * s, AVFormatParameters * ap)
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{
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ogg_t *ogg = s->priv_data;
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ogg->curidx = -1;
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//linear headers seek from start
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if (ogg_get_headers (s) < 0){
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return -1;
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}
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//linear granulepos seek from end
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ogg_get_length (s);
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//fill the extradata in the per codec callbacks
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return 0;
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}
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static int
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ogg_read_packet (AVFormatContext * s, AVPacket * pkt)
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{
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ogg_t *ogg;
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ogg_stream_t *os;
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int idx = -1;
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//Get an ogg packet
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do{
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if (ogg_packet (s, &idx) < 0)
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return AVERROR_IO;
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}while (idx < 0 || !s->streams[idx]);
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ogg = s->priv_data;
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os = ogg->streams + idx;
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//Alloc a pkt
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if (av_new_packet (pkt, os->psize) < 0)
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return AVERROR_IO;
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pkt->stream_index = idx;
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memcpy (pkt->data, os->buf + os->pstart, os->psize);
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if (os->lastgp != -1LL){
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pkt->pts = ogg_gptopts (s, idx, os->lastgp);
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os->lastgp = -1;
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}
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//next
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os->pstart += os->psize;
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os->psize = 0;
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return os->psize;
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}
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static int
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ogg_read_close (AVFormatContext * s)
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{
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ogg_t *ogg = s->priv_data;
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int i;
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for (i = 0; i < ogg->nstreams; i++){
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av_free (ogg->streams[i].buf);
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av_free (ogg->streams[i].private);
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av_freep (&s->streams[i]->codec->extradata);
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}
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av_free (ogg->streams);
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return 0;
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}
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static int
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ogg_read_seek (AVFormatContext * s, int stream_index, int64_t target_ts,
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int flags)
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{
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ogg_t *ogg = s->priv_data;
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ByteIOContext *bc = &s->pb;
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uint64_t min = 0, max = ogg->size;
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uint64_t tmin = 0, tmax = s->duration;
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int64_t pts = AV_NOPTS_VALUE;
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ogg_save (s);
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while (min <= max){
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uint64_t p = min + (max - min) * (target_ts - tmin) / (tmax - tmin);
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int i = -1;
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url_fseek (bc, p, SEEK_SET);
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while (!ogg_read_page (s, &i)){
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if (ogg->streams[i].granule != 0 && ogg->streams[i].granule != -1)
|
|
break;
|
|
}
|
|
|
|
if (i == -1)
|
|
break;
|
|
|
|
pts = ogg_gptopts (s, i, ogg->streams[i].granule);
|
|
p = url_ftell (bc);
|
|
|
|
if (ABS (pts - target_ts) < 1000000LL)
|
|
break;
|
|
|
|
if (pts > target_ts){
|
|
max = p;
|
|
tmax = pts;
|
|
}else{
|
|
min = p;
|
|
tmin = pts;
|
|
}
|
|
}
|
|
|
|
if (ABS (pts - target_ts) < 1000000LL){
|
|
ogg_restore (s, 1);
|
|
ogg_reset (ogg);
|
|
}else{
|
|
ogg_restore (s, 0);
|
|
pts = AV_NOPTS_VALUE;
|
|
}
|
|
|
|
return pts;
|
|
|
|
#if 0
|
|
//later...
|
|
int64_t pos;
|
|
if (av_seek_frame_binary (s, stream_index, target_ts, flags) < 0)
|
|
return -1;
|
|
pos = url_ftell (&s->pb);
|
|
ogg_read_timestamp (s, stream_index, &pos, pos - 1);
|
|
#endif
|
|
|
|
}
|
|
|
|
#if 0
|
|
static int64_t
|
|
ogg_read_timestamp (AVFormatContext * s, int stream_index, int64_t * pos_arg,
|
|
int64_t pos_limit)
|
|
{
|
|
ogg_t *ogg = s->priv_data;
|
|
ByteIOContext *bc = &s->pb;
|
|
int64_t pos, pts;
|
|
|
|
if (*pos_arg < 0)
|
|
return AV_NOPTS_VALUE;
|
|
|
|
pos = *pos_arg;
|
|
}
|
|
#endif
|
|
|
|
static int ogg_probe(AVProbeData *p)
|
|
{
|
|
if (p->buf_size < 6)
|
|
return 0;
|
|
if (p->buf[0] == 'O' && p->buf[1] == 'g' &&
|
|
p->buf[2] == 'g' && p->buf[3] == 'S' &&
|
|
p->buf[4] == 0x0 && p->buf[5] <= 0x7 )
|
|
return AVPROBE_SCORE_MAX;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat ogg_iformat = {
|
|
"ogg",
|
|
"Ogg",
|
|
sizeof (ogg_t),
|
|
ogg_probe,
|
|
ogg_read_header,
|
|
ogg_read_packet,
|
|
ogg_read_close,
|
|
ogg_read_seek,
|
|
// ogg_read_timestamp,
|
|
.extensions = "ogg",
|
|
};
|
|
|
|
int
|
|
ogg_init (void)
|
|
{
|
|
#if 0 // CONFIG_MUXERS
|
|
av_register_output_format (&ogg_oformat);
|
|
#endif
|
|
av_register_input_format (&ogg_iformat);
|
|
return 0;
|
|
}
|