/* * Ogg bitstream support * Luca Barbato <lu_zero@gentoo.org> * Based on tcvp implementation * */ /** Copyright (C) 2005 Michael Ahlberg, Måns Rullgård 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 <stdio.h> #include "oggdec.h" #include "avformat.h" #define MAX_PAGE_SIZE 65307 #define DECODER_BUFFER_SIZE MAX_PAGE_SIZE static ogg_codec_t *ogg_codecs[] = { &speex_codec, &vorbis_codec, &theora_codec, &flac_codec, &old_flac_codec, &ogm_video_codec, &ogm_audio_codec, &ogm_text_codec, &ogm_old_codec, NULL }; //FIXME We could avoid some structure duplication static int ogg_save (AVFormatContext * s) { ogg_t *ogg = s->priv_data; ogg_state_t *ost = av_malloc(sizeof (*ost) + (ogg->nstreams-1) * sizeof (*ogg->streams)); int i; ost->pos = url_ftell (s->pb); ost->curidx = ogg->curidx; ost->next = ogg->state; ost->nstreams = ogg->nstreams; memcpy(ost->streams, ogg->streams, ogg->nstreams * sizeof(*ogg->streams)); for (i = 0; i < ogg->nstreams; i++){ ogg_stream_t *os = ogg->streams + i; os->buf = av_malloc (os->bufsize); memset (os->buf, 0, os->bufsize); memcpy (os->buf, ost->streams[i].buf, os->bufpos); } ogg->state = ost; return 0; } static int ogg_restore (AVFormatContext * s, int discard) { ogg_t *ogg = s->priv_data; ByteIOContext *bc = s->pb; ogg_state_t *ost = ogg->state; int i; if (!ost) return 0; ogg->state = ost->next; if (!discard){ for (i = 0; i < ogg->nstreams; i++) av_free (ogg->streams[i].buf); url_fseek (bc, ost->pos, SEEK_SET); ogg->curidx = ost->curidx; ogg->nstreams = ost->nstreams; memcpy(ogg->streams, ost->streams, ost->nstreams * sizeof(*ogg->streams)); } av_free (ost); return 0; } static int ogg_reset (ogg_t * ogg) { int i; for (i = 0; i < ogg->nstreams; i++){ ogg_stream_t *os = ogg->streams + i; os->bufpos = 0; os->pstart = 0; os->psize = 0; os->granule = -1; os->lastgp = -1; os->nsegs = 0; os->segp = 0; } ogg->curidx = -1; return 0; } static ogg_codec_t * ogg_find_codec (uint8_t * buf, int size) { int i; for (i = 0; ogg_codecs[i]; i++) if (size >= ogg_codecs[i]->magicsize && !memcmp (buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize)) return ogg_codecs[i]; return NULL; } static int ogg_find_stream (ogg_t * ogg, int serial) { int i; for (i = 0; i < ogg->nstreams; i++) if (ogg->streams[i].serial == serial) return i; return -1; } static int ogg_new_stream (AVFormatContext * s, uint32_t serial) { ogg_t *ogg = s->priv_data; int idx = ogg->nstreams++; AVStream *st; ogg_stream_t *os; ogg->streams = av_realloc (ogg->streams, ogg->nstreams * sizeof (*ogg->streams)); memset (ogg->streams + idx, 0, sizeof (*ogg->streams)); os = ogg->streams + idx; os->serial = serial; os->bufsize = DECODER_BUFFER_SIZE; os->buf = av_malloc(os->bufsize); os->header = -1; st = av_new_stream (s, idx); if (!st) return AVERROR(ENOMEM); av_set_pts_info(st, 64, 1, 1000000); return idx; } static int ogg_new_buf(ogg_t *ogg, int idx) { ogg_stream_t *os = ogg->streams + idx; uint8_t *nb = av_malloc(os->bufsize); int size = os->bufpos - os->pstart; if(os->buf){ memcpy(nb, os->buf + os->pstart, size); av_free(os->buf); } os->buf = nb; os->bufpos = size; os->pstart = 0; return 0; } static int ogg_read_page (AVFormatContext * s, int *str) { ByteIOContext *bc = s->pb; ogg_t *ogg = s->priv_data; ogg_stream_t *os; int i = 0; int flags, nsegs; uint64_t gp; uint32_t serial; uint32_t seq; uint32_t crc; int size, idx; uint8_t sync[4]; int sp = 0; if (get_buffer (bc, sync, 4) < 4) return -1; do{ int c; if (sync[sp & 3] == 'O' && sync[(sp + 1) & 3] == 'g' && sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S') break; c = url_fgetc (bc); if (c < 0) return -1; sync[sp++ & 3] = c; }while (i++ < MAX_PAGE_SIZE); if (i >= MAX_PAGE_SIZE){ av_log (s, AV_LOG_INFO, "ogg, can't find sync word\n"); return -1; } if (url_fgetc (bc) != 0) /* version */ return -1; flags = url_fgetc (bc); gp = get_le64 (bc); serial = get_le32 (bc); seq = get_le32 (bc); crc = get_le32 (bc); nsegs = url_fgetc (bc); idx = ogg_find_stream (ogg, serial); if (idx < 0){ idx = ogg_new_stream (s, serial); if (idx < 0) return -1; } os = ogg->streams + idx; if(os->psize > 0) ogg_new_buf(ogg, idx); if (get_buffer (bc, os->segments, nsegs) < nsegs) return -1; os->nsegs = nsegs; os->segp = 0; size = 0; for (i = 0; i < nsegs; i++) size += os->segments[i]; if (flags & OGG_FLAG_CONT){ if (!os->psize){ while (os->segp < os->nsegs){ int seg = os->segments[os->segp++]; os->pstart += seg; if (seg < 255) break; } } }else{ os->psize = 0; } if (os->bufsize - os->bufpos < size){ uint8_t *nb = av_malloc (os->bufsize *= 2); memcpy (nb, os->buf, os->bufpos); av_free (os->buf); os->buf = nb; } if (get_buffer (bc, os->buf + os->bufpos, size) < size) return -1; os->lastgp = os->granule; os->bufpos += size; os->granule = gp; os->flags = flags; if (str) *str = idx; return 0; } static int ogg_packet (AVFormatContext * s, int *str, int *dstart, int *dsize) { ogg_t *ogg = s->priv_data; int idx; ogg_stream_t *os; int complete = 0; int segp = 0, psize = 0; #if 0 av_log (s, AV_LOG_DEBUG, "ogg_packet: curidx=%i\n", ogg->curidx); #endif do{ idx = ogg->curidx; while (idx < 0){ if (ogg_read_page (s, &idx) < 0) return -1; } os = ogg->streams + idx; #if 0 av_log (s, AV_LOG_DEBUG, "ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n", idx, os->pstart, os->psize, os->segp, os->nsegs); #endif if (!os->codec){ if (os->header < 0){ os->codec = ogg_find_codec (os->buf, os->bufpos); if (!os->codec){ os->header = 0; return 0; } }else{ return 0; } } segp = os->segp; psize = os->psize; while (os->segp < os->nsegs){ int ss = os->segments[os->segp++]; os->psize += ss; if (ss < 255){ complete = 1; break; } } if (!complete && os->segp == os->nsegs){ ogg->curidx = -1; } }while (!complete); #if 0 av_log (s, AV_LOG_DEBUG, "ogg_packet: idx %i, frame size %i, start %i\n", idx, os->psize, os->pstart); #endif ogg->curidx = idx; if (os->header < 0){ int hdr = os->codec->header (s, idx); if (!hdr){ os->header = os->seq; os->segp = segp; os->psize = psize; ogg->headers = 1; }else{ os->pstart += os->psize; os->psize = 0; } } if (os->header > -1 && os->seq > os->header){ os->pflags = 0; if (os->codec && os->codec->packet) os->codec->packet (s, idx); if (str) *str = idx; if (dstart) *dstart = os->pstart; if (dsize) *dsize = os->psize; os->pstart += os->psize; os->psize = 0; } os->seq++; if (os->segp == os->nsegs) ogg->curidx = -1; return 0; } static int ogg_get_headers (AVFormatContext * s) { ogg_t *ogg = s->priv_data; do{ if (ogg_packet (s, NULL, NULL, NULL) < 0) return -1; }while (!ogg->headers); #if 0 av_log (s, AV_LOG_DEBUG, "found headers\n"); #endif return 0; } static uint64_t ogg_gptopts (AVFormatContext * s, int i, uint64_t gp) { ogg_t *ogg = s->priv_data; ogg_stream_t *os = ogg->streams + i; uint64_t pts = AV_NOPTS_VALUE; if(os->codec->gptopts){ pts = os->codec->gptopts(s, i, gp); } else { pts = gp; } return pts; } static int ogg_get_length (AVFormatContext * s) { ogg_t *ogg = s->priv_data; int idx = -1, i; offset_t size, end; if(url_is_streamed(s->pb)) return 0; // already set if (s->duration != AV_NOPTS_VALUE) return 0; size = url_fsize(s->pb); if(size < 0) return 0; end = size > MAX_PAGE_SIZE? size - MAX_PAGE_SIZE: size; ogg_save (s); url_fseek (s->pb, end, SEEK_SET); while (!ogg_read_page (s, &i)){ if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 && ogg->streams[i].codec) idx = i; } if (idx != -1){ s->streams[idx]->duration = ogg_gptopts (s, idx, ogg->streams[idx].granule); } ogg->size = size; ogg_restore (s, 0); return 0; } static int ogg_read_header (AVFormatContext * s, AVFormatParameters * ap) { ogg_t *ogg = s->priv_data; ogg->curidx = -1; //linear headers seek from start if (ogg_get_headers (s) < 0){ return -1; } //linear granulepos seek from end ogg_get_length (s); //fill the extradata in the per codec callbacks return 0; } static int ogg_read_packet (AVFormatContext * s, AVPacket * pkt) { ogg_t *ogg; ogg_stream_t *os; int idx = -1; int pstart, psize; //Get an ogg packet do{ if (ogg_packet (s, &idx, &pstart, &psize) < 0) return AVERROR(EIO); }while (idx < 0 || !s->streams[idx]); ogg = s->priv_data; os = ogg->streams + idx; //Alloc a pkt if (av_new_packet (pkt, psize) < 0) return AVERROR(EIO); pkt->stream_index = idx; memcpy (pkt->data, os->buf + pstart, psize); if (os->lastgp != -1LL){ pkt->pts = ogg_gptopts (s, idx, os->lastgp); os->lastgp = -1; } pkt->flags = os->pflags; return psize; } static int ogg_read_close (AVFormatContext * s) { ogg_t *ogg = s->priv_data; int i; for (i = 0; i < ogg->nstreams; i++){ av_free (ogg->streams[i].buf); av_free (ogg->streams[i].private); } av_free (ogg->streams); return 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 pts = AV_NOPTS_VALUE; int i; url_fseek(bc, *pos_arg, SEEK_SET); while (url_ftell(bc) < pos_limit && !ogg_read_page (s, &i)) { if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 && ogg->streams[i].codec && i == stream_index) { pts = ogg_gptopts(s, i, ogg->streams[i].granule); // FIXME: this is the position of the packet after the one with above // pts. *pos_arg = url_ftell(bc); break; } } ogg_reset(ogg); return pts; } static int ogg_probe(AVProbeData *p) { 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; } AVInputFormat ogg_demuxer = { "ogg", NULL_IF_CONFIG_SMALL("Ogg"), sizeof (ogg_t), ogg_probe, ogg_read_header, ogg_read_packet, ogg_read_close, NULL, ogg_read_timestamp, .extensions = "ogg", };