/* * Ogg bitstream support * Luca Barbato <lu_zero@gentoo.org> * Based on tcvp implementation * *//**    Copyright (C) 2005  Michael Ahlberg, M?ns Rullg?rd    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_SIZEstatic 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 duplicationstatic intogg_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 intogg_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 intogg_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 intogg_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 intogg_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 intogg_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 intogg_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 intogg_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 intogg_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_togg_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 intogg_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 intogg_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 intogg_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 intogg_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_togg_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",};