path: root/libmpdemux/demux_ogg.c

/*
 * This file is part of MPlayer.
 *
 * MPlayer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MPlayer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <math.h>
#include <inttypes.h>

#include <libavutil/intreadwrite.h>

#include "options.h"
#include "mp_msg.h"
#include "talloc.h"
#include "stream/stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "aviprint.h"
#include "demux_mov.h"
#include "demux_ogg.h"

#define FOURCC_VORBIS mmioFOURCC('v', 'r', 'b', 's')
#define FOURCC_SPEEX  mmioFOURCC('s', 'p', 'x', ' ')
#define FOURCC_THEORA mmioFOURCC('t', 'h', 'e', 'o')

#ifdef CONFIG_TREMOR
#include <tremor/ogg.h>
#include <tremor/ivorbiscodec.h>
#else
#include <ogg/ogg.h>
#include <vorbis/codec.h>
#endif

#ifdef CONFIG_OGGTHEORA
#include <theora/theora.h>
int _ilog (unsigned int); /* defined in many places in theora/lib/ */
#endif

#define BLOCK_SIZE 4096

/* Theora decoder context : we won't be able to interpret granule positions
 * without using theora_granule_time with the theora_state of the stream.
 * This is duplicated in `vd_theora.c'; put this in a common header?
 */
#ifdef CONFIG_OGGTHEORA
typedef struct theora_struct_st {
    theora_state   st;
    theora_comment cc;
    theora_info    inf;
} theora_struct_t;
#endif

//// OggDS headers
// Header for the new header format
typedef struct stream_header_video {
    ogg_int32_t width;
    ogg_int32_t height;
} stream_header_video;

typedef struct stream_header_audio {
    ogg_int16_t channels;
    ogg_int16_t blockalign;
    ogg_int32_t avgbytespersec;
} stream_header_audio;

typedef struct __attribute__((__packed__)) stream_header {
    char streamtype[8];
    char subtype[4];

    ogg_int32_t size;               // size of the structure

    ogg_int64_t time_unit;          // in reference time
    ogg_int64_t samples_per_unit;
    ogg_int32_t default_len;        // in media time

    ogg_int32_t buffersize;
    ogg_int16_t bits_per_sample;

    ogg_int16_t padding;

    union {
        // Video specific
        stream_header_video	video;
        // Audio specific
        stream_header_audio	audio;
    } sh;
} stream_header;

/// Our private datas

typedef struct ogg_syncpoint {
    int64_t granulepos;
    off_t   page_pos;
} ogg_syncpoint_t;

/// A logical stream
typedef struct ogg_stream {
    /// Timestamping stuff
    float   samplerate; /// granulpos 2 time
    int64_t lastpos;
    int32_t lastsize;
    int     keyframe_frequency_force;

    // Logical stream state
    ogg_stream_state stream;
    int hdr_packets;
    int vorbis;
    int speex;
    int theora;
    int flac;
    int text;
    int id;

    vorbis_info vi;
    int         vi_initialized;

    void *ogg_d;
} ogg_stream_t;

typedef struct ogg_demuxer {
    /// Physical stream state
    ogg_sync_state   sync;
    /// Current page
    ogg_page         page;
    /// Logical streams
    ogg_stream_t    *subs;
    int              num_sub;
    ogg_syncpoint_t *syncpoints;
    int              num_syncpoint;
    off_t            pos, last_size;
    int64_t          initial_granulepos;
    int64_t          final_granulepos;
    int64_t          duration;

    /* Used for subtitle switching. */
    int    n_text;
    int   *text_ids;
    char **text_langs;
} ogg_demuxer_t;

#define NUM_VORBIS_HDR_PACKETS 3

/// Some defines from OggDS
#define PACKET_TYPE_HEADER  0x01
#define PACKET_TYPE_BITS    0x07
#define PACKET_LEN_BITS01   0xc0
#define PACKET_LEN_BITS2    0x02
#define PACKET_IS_SYNCPOINT 0x08

//-------- subtitle support - should be moved to decoder layer, and queue
//                          - subtitles up in demuxer buffer...

#include "sub/subreader.h"
#include "sub/sub.h"
#define OGG_SUB_MAX_LINE 128

static subtitle ogg_sub;
//FILE* subout;

static void demux_ogg_add_sub(ogg_stream_t *os, ogg_packet *pack)
{
    int lcv;
    char *packet = pack->packet;

    if (pack->bytes < 4)
        return;
    mp_msg(MSGT_DEMUX, MSGL_DBG2, "\ndemux_ogg_add_sub %02X %02X %02X '%s'\n",
           (unsigned char)packet[0],
           (unsigned char)packet[1],
           (unsigned char)packet[2],
           &packet[3]);

    if (((unsigned char)packet[0]) == 0x88) { // some subtitle text
        // Find data start
        double endpts = MP_NOPTS_VALUE;
        int32_t duration = 0;
        int16_t hdrlen = (*packet & PACKET_LEN_BITS01) >> 6, i;

        hdrlen |= (*packet & PACKET_LEN_BITS2) << 1;
        lcv = 1 + hdrlen;
        if (pack->bytes < lcv)
            return;
        for (i = hdrlen; i > 0; i--) {
            duration <<= 8;
            duration  |= (unsigned char)packet[i];
        }
        if (hdrlen > 0 && duration > 0) {
            float pts;

            if (pack->granulepos == -1)
                pack->granulepos = os->lastpos + os->lastsize;
            pts    = (float)pack->granulepos / (float)os->samplerate;
            endpts = 1.0 + pts + (float)duration / 1000.0;
        }
        sub_clear_text(&ogg_sub, MP_NOPTS_VALUE);
        sub_add_text(&ogg_sub, &packet[lcv], pack->bytes - lcv, endpts);
    }

    mp_msg(MSGT_DEMUX, MSGL_DBG2, "Ogg sub lines: %d  first: '%s'\n",
            ogg_sub.lines, ogg_sub.text[0]);
#ifdef CONFIG_ICONV
    subcp_recode(&ogg_sub);
#endif
    vo_sub = &ogg_sub;
    vo_osd_changed(OSDTYPE_SUBTITLE);
}


// get the logical stream of the current page
// fill os if non NULL and return the stream id
static int demux_ogg_get_page_stream(ogg_demuxer_t *ogg_d,
                                     ogg_stream_state **os)
{
    int id, s_no;
    ogg_page *page = &ogg_d->page;

    s_no = ogg_page_serialno(page);

    for (id = 0; id < ogg_d->num_sub; id++)
        if (s_no == ogg_d->subs[id].stream.serialno)
            break;

    if (id == ogg_d->num_sub) {
        // If we have only one vorbis stream allow the stream id to change
        // it's normal on radio stream (each song have an different id).
        // But we (or the codec?) should check that the samplerate, etc
        // doesn't change (for radio stream it's ok)
        if (ogg_d->num_sub == 1 && ogg_d->subs[0].vorbis) {
            ogg_stream_reset(&ogg_d->subs[0].stream);
            ogg_stream_init(&ogg_d->subs[0].stream, s_no);
            id = 0;
        } else
            return -1;
    }

    if (os)
        *os = &ogg_d->subs[id].stream;

    return id;
}

static unsigned char *demux_ogg_read_packet(ogg_stream_t *os, ogg_packet *pack,
                                            float *pts, int *flags,
                                            int samplesize)
{
    unsigned char *data = pack->packet;

    *pts = MP_NOPTS_VALUE;
    *flags = 0;

    if (os->vorbis) {
        if (*pack->packet & PACKET_TYPE_HEADER) {
            os->hdr_packets++;
        } else {
            vorbis_info *vi;
            int32_t blocksize = 0;

            // When we dump the audio, there is no vi, but we don't care of timestamp in this case
            vi = os->vi_initialized ? &os->vi : NULL;
            if (vi)
                blocksize = vorbis_packet_blocksize(vi, pack) / samplesize;
            // Calculate the timestamp if the packet don't have any
            if (pack->granulepos == -1) {
                pack->granulepos = os->lastpos;
                if (os->lastsize > 0)
                    pack->granulepos += os->lastsize;
            } else
                *flags = 1;
            if (vi)
                *pts = pack->granulepos / (float)vi->rate;
            os->lastsize = blocksize;
            os->lastpos  = pack->granulepos;
        }
    } else if (os->speex) {
        // whole packet (default)
# ifdef CONFIG_OGGTHEORA
    } else if (os->theora) {
        /* we pass complete packets to theora, mustn't strip the header! */
        os->lastsize = 1;

        /* header packets begin on 1-bit: thus check (*data&0x80).  We don't
           have theora_state st, until all header packets were passed to the
           decoder. */
        if (!pack->bytes || !(*data&0x80)) {
            int keyframe_granule_shift = _ilog(os->keyframe_frequency_force - 1);
            int64_t iframemask = (1 << keyframe_granule_shift) - 1;

            if (pack->granulepos >= 0) {
                os->lastpos  = pack->granulepos >> keyframe_granule_shift;
                os->lastpos += pack->granulepos & iframemask;
                *flags = (pack->granulepos & iframemask) == 0;
            } else {
                os->lastpos++;
            }
            pack->granulepos = os->lastpos;
            *pts = (double)os->lastpos / (double)os->samplerate;
        }
#endif /* CONFIG_OGGTHEORA */
    } else if (os->flac) {
        /* we pass complete packets to flac, mustn't strip the header! */
        if (os->flac == 2 && pack->packet[0] != 0xff)
            return NULL;
    } else {
        if (*pack->packet & PACKET_TYPE_HEADER) {
            os->hdr_packets++;
        } else {
            // Find data start
            int16_t hdrlen = (*pack->packet & PACKET_LEN_BITS01) >> 6;

            hdrlen |= (*pack->packet & PACKET_LEN_BITS2) << 1;
            data = pack->packet + 1 + hdrlen;
            // Calculate the timestamp
            if (pack->granulepos == -1)
                pack->granulepos = os->lastpos + (os->lastsize ? os->lastsize : 1);
            // If we already have a timestamp it can be a syncpoint
            if (*pack->packet & PACKET_IS_SYNCPOINT)
                *flags = 1;
            *pts = pack->granulepos / os->samplerate;
            // Save the packet length and timestamp
            os->lastsize = 0;
            while (hdrlen) {
                os->lastsize <<= 8;
                os->lastsize  |= pack->packet[hdrlen];
                hdrlen--;
            }
            os->lastpos = pack->granulepos;
        }
    }
    return data;
}

// check if clang has substring from comma separated langlist
static int demux_ogg_check_lang(const char *clang, char **langlist)
{
    if (!langlist)
        return 0;
    for (int i = 0; langlist[i]; i++)
        if (!strncasecmp(clang, langlist[i], strlen(langlist[i])))
            return 1;
    return 0;
}

/** \brief Change the current subtitle stream and return its ID.

  \param demuxer The demuxer whose subtitle stream will be changed.
  \param new_num The number of the new subtitle track. The number must be
  between 0 and ogg_d->n_text - 1.

  \returns The Ogg stream number ( = page serial number) of the newly selected
  track.
  */
static int demux_ogg_sub_id(demuxer_t *demuxer, int index)
{
    ogg_demuxer_t *ogg_d = demuxer->priv;
    return (index < 0) ? index : (index >= ogg_d->n_text) ? -1 : ogg_d->text_ids[index];
}

/** \brief Translate the ogg track number into the subtitle number.
 *  \param demuxer The demuxer about whose subtitles we are inquiring.
 *  \param id The ogg track number of the subtitle track.
 */
static int demux_ogg_sub_reverse_id(demuxer_t *demuxer, int id)
{
    ogg_demuxer_t *ogg_d = demuxer->priv;
    int i;

    for (i = 0; i < ogg_d->n_text; i++)
        if (ogg_d->text_ids[i] == id)
            return i;
    return -1;
}

/// Try to print out comments and also check for LANGUAGE= tag
static void demux_ogg_check_comments(demuxer_t *d, ogg_stream_t *os,
                                     int id, vorbis_comment *vc)
{
    const char *hdr, *val;
    char **cmt = vc->user_comments;
    int index, i;
    ogg_demuxer_t *ogg_d = d->priv;
    static const struct table {
        const char *ogg;
        const char *mp;
    } table[] = {
        { "ENCODED_USING", "Software"      },
        { "ENCODER_URL",   "Encoder URL"   },
        { "TITLE",         "Title"         },
        { "ARTIST",        "Artist"        },
        { "COMMENT",       "Comments"      },
        { "DATE",          "Creation Date" },
        { "GENRE",         "Genre"         },
        { "ALBUM",         "Album"         },
        { "TRACKNUMBER",   "Track"         },
        { NULL, NULL },
    };

    while (*cmt) {
        hdr = val = NULL;
        if (!strncasecmp(*cmt, "LANGUAGE=", 9)) {
            val = *cmt + 9;
            if (ogg_d->subs[id].text)
                mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_SID_%d_LANG=%s\n",
                       ogg_d->subs[id].id, val);
            else if (id != d->video->id)
                mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_AID_%d_LANG=%s\n",
                       ogg_d->subs[id].id, val);
            if (ogg_d->subs[id].text)
                mp_msg(MSGT_DEMUX, MSGL_INFO,
                       "[Ogg] Language for -sid %d is '-slang \"%s\"'\n",
                       ogg_d->subs[id].id, val);
            // copy this language name into the array
            index = demux_ogg_sub_reverse_id(d, id);
            if (index >= 0) {
                sh_sub_t *sh;

                // in case of malicious files with more than one lang per track:
                free(ogg_d->text_langs[index]);
                ogg_d->text_langs[index] = strdup(val);
                sh = d->s_streams[index];
                if (sh) {
                    talloc_free(sh->lang);
                    sh->lang = talloc_strdup(sh, val);
                }
            }
            // check for -slang if subs are uninitialized yet
            if (os->text && d->sub->id < 0
                && demux_ogg_check_lang(val, d->opts->sub_lang)) {
                d->sub->id = index;
                d->opts->sub_id  = index;
                mp_msg(MSGT_DEMUX, MSGL_V,
                       "Ogg demuxer: Displaying subtitle stream id %d which matched -slang %s\n",
                       id, val);
            }
            else
                hdr = "Language";
        }
        else {
            for (i = 0; table[i].ogg; i++) {
                if (!strncasecmp(*cmt, table[i].ogg, strlen(table[i].ogg)) &&
                        (*cmt)[strlen(table[i].ogg)] == '=') {
                    hdr = table[i].mp;
                    val = *cmt + strlen(table[i].ogg) + 1;
                }
            }
        }
        if (hdr)
            demux_info_add(d, hdr, val);
        mp_dbg(MSGT_DEMUX, MSGL_DBG2, " %s: %s\n", hdr, val);
        cmt++;
    }
}

/// Calculate the timestamp and add the packet to the demux stream
// return 1 if the packet was added, 0 otherwise
static int demux_ogg_add_packet(demux_stream_t *ds, ogg_stream_t *os,
                                int id, ogg_packet *pack)
{
    demuxer_t *d = ds->demuxer;
    demux_packet_t *dp;
    unsigned char *data;
    float pts = 0;
    int flags = 0;
    int samplesize = 1;

    // If packet is an comment header then we try to get comments at first
    if (pack->bytes >= 7 && !memcmp(pack->packet, "\003vorbis", 7)) {
        vorbis_info vi;
        vorbis_comment vc;

        vorbis_info_init(&vi);
        vorbis_comment_init(&vc);
        vi.rate = 1L; // it's checked by vorbis_synthesis_headerin()
        if (vorbis_synthesis_headerin(&vi, &vc, pack) == 0) // if no errors
            demux_ogg_check_comments(d, os, id, &vc);
        vorbis_comment_clear(&vc);
        vorbis_info_clear(&vi);
    }
    if (os->text) {
        if (id == demux_ogg_sub_id(d, d->sub->id)) // don't want to add subtitles to the demuxer for now
            demux_ogg_add_sub(os, pack);
        return 0;
    }
    if (os->speex) {
        // discard first two packets, they contain the header and comment
        if (os->hdr_packets < 2) {
            os->hdr_packets++;
            return 0;
        }
    } else {
        // If packet is an header we jump it except for vorbis and theora
        // (PACKET_TYPE_HEADER bit doesn't even exist for theora ?!)
        // We jump nothing for FLAC. Ain't this great? Packet contents have to be
        // handled differently for each and every stream type. The joy! The joy!
        if (!os->flac && (*pack->packet & PACKET_TYPE_HEADER) &&
                (ds != d->audio || ((sh_audio_t*)ds->sh)->format != FOURCC_VORBIS || os->hdr_packets >= NUM_VORBIS_HDR_PACKETS ) &&
                (ds != d->video || (((sh_video_t*)ds->sh)->format != FOURCC_THEORA)))
            return 0;
    }

    // For vorbis packet the packet is the data, for other codec we must jump
    // the header
    if (ds == d->audio && ((sh_audio_t*)ds->sh)->format == FOURCC_VORBIS) {
        samplesize = ((sh_audio_t *)ds->sh)->samplesize;
    }
    data = demux_ogg_read_packet(os, pack, &pts, &flags, samplesize);
    if (!data)
        return 0;

    /// Clear subtitles if necessary (for broken files)
    if (sub_clear_text(&ogg_sub, pts)) {
        vo_sub = &ogg_sub;
        vo_osd_changed(OSDTYPE_SUBTITLE);
    }
    /// Send the packet
    dp = new_demux_packet(pack->bytes - (data - pack->packet));
    memcpy(dp->buffer, data, pack->bytes - (data - pack->packet));
    dp->pts   = pts;
    dp->flags = flags;
    ds_add_packet(ds, dp);
    mp_msg(MSGT_DEMUX, MSGL_DBG2,
           "New dp: %p  ds=%p  pts=%5.3f  len=%d  flag=%d  \n",
           dp, ds, pts, dp->len, flags);
    return 1;
}

/// if -forceidx build a table of all syncpoints to make seeking easier
/// otherwise try to get at least the final_granulepos
static void demux_ogg_scan_stream(demuxer_t *demuxer)
{
    ogg_demuxer_t *ogg_d = demuxer->priv;
    stream_t      *s     = demuxer->stream;
    ogg_sync_state *sync = &ogg_d->sync;
    ogg_page       *page = &ogg_d->page;
    ogg_stream_state *oss;
    ogg_stream_t *os;
    ogg_packet op;
    int np, sid, p, samplesize = 1;
    off_t pos, last_pos;

    pos = last_pos = demuxer->movi_start;

    // Reset the stream
    stream_seek(s, demuxer->movi_start);
    ogg_sync_reset(sync);

    // Get the serial number of the stream we use
    if (demuxer->video->id >= 0) {
        sid = demuxer->video->id;
    } else if (demuxer->audio->id >= 0) {
        sid = demuxer->audio->id;
        if (((sh_audio_t*)demuxer->audio->sh)->format == FOURCC_VORBIS)
            samplesize = ((sh_audio_t*)demuxer->audio->sh)->samplesize;
    } else
        return;
    os  = &ogg_d->subs[sid];
    oss = &os->stream;

    while (1) {
        np = ogg_sync_pageseek(sync, page);
        if (np < 0) { // We had to skip some bytes
            if (index_mode == 2)
                mp_msg(MSGT_DEMUX, MSGL_ERR,
                       "Bad page sync while building syncpoints table (%d)\n",
                       -np);
            pos += -np;
            continue;
        }
        if (np <= 0) { // We need more data
            char *buf = ogg_sync_buffer(sync, BLOCK_SIZE);
            int len   = stream_read(s, buf, BLOCK_SIZE);

            if (len == 0 && s->eof)
                break;
            ogg_sync_wrote(sync, len);
            continue;
        }
        // The page is ready
        //ogg_sync_pageout(sync, page);
        if (ogg_page_serialno(page) != os->stream.serialno) { // It isn't a page from the stream we want
            pos += np;
            continue;
        }
        if (ogg_stream_pagein(oss, page) != 0) {
            mp_msg(MSGT_DEMUX, MSGL_ERR, "Pagein error ????\n");
            pos += np;
            continue;
        }
        p = 0;
        while (ogg_stream_packetout(oss, &op) == 1) {
            float pts;
            int flags;

            demux_ogg_read_packet(os, &op, &pts, &flags, samplesize);
            if (op.granulepos >= 0) {
                ogg_d->final_granulepos = op.granulepos;
                if (ogg_d->initial_granulepos == MP_NOPTS_VALUE && (flags & 1)) {
                    ogg_d->initial_granulepos = op.granulepos;
                    if (index_mode != 2 && ogg_d->pos < demuxer->movi_end - 2 * 270000) {
                        //the 270000 are just a wild guess
                        stream_seek(s, FFMAX(ogg_d->pos, demuxer->movi_end - 270000));
                        ogg_sync_reset(sync);
                        continue;
                    }
                }
            }
            if (index_mode == 2 && (flags || (os->vorbis && op.granulepos >= 0))) {
                if (ogg_d->num_syncpoint > SIZE_MAX / sizeof(ogg_syncpoint_t) - 1)
                    break;
                ogg_d->syncpoints = realloc_struct(ogg_d->syncpoints, (ogg_d->num_syncpoint + 1), sizeof(ogg_syncpoint_t));
                ogg_d->syncpoints[ogg_d->num_syncpoint].granulepos = op.granulepos;
                ogg_d->syncpoints[ogg_d->num_syncpoint].page_pos   = (ogg_page_continued(page) && p == 0) ? last_pos : pos;
                ogg_d->num_syncpoint++;
            }
            p++;
        }
        if (p > 1 || (p == 1 && !ogg_page_continued(page)))
            last_pos = pos;
        pos += np;
        if (index_mode == 2)
            mp_msg(MSGT_DEMUX, MSGL_INFO, "Building syncpoint table %d%%\r",
                   (int)(pos * 100 / s->end_pos));
    }

    if (index_mode == 2) {
        mp_msg(MSGT_DEMUX, MSGL_INFO, "\n");
        mp_msg(MSGT_DEMUX, MSGL_V,
               "Ogg syncpoints table builed: %d syncpoints\n",
               ogg_d->num_syncpoint);
    }

    mp_msg(MSGT_DEMUX, MSGL_V, "Ogg stream length (granulepos): %"PRId64"\n",
           ogg_d->final_granulepos);

    stream_reset(s);
    stream_seek(s, demuxer->movi_start);
    ogg_sync_reset(sync);
    for (np = 0; np < ogg_d->num_sub; np++) {
        ogg_stream_reset(&ogg_d->subs[np].stream);
        ogg_d->subs[np].lastpos = ogg_d->subs[np].lastsize = ogg_d->subs[np].hdr_packets = 0;
    }

    // Get the first page
    while (1) {
        np = ogg_sync_pageout(sync, page);
        if (np <= 0) { // We need more data
            char *buf = ogg_sync_buffer(sync, BLOCK_SIZE);
            int len = stream_read(s, buf, BLOCK_SIZE);

            if (len == 0 && s->eof) {
                mp_msg(MSGT_DEMUX, MSGL_ERR, "EOF while trying to get the first page !!!!\n");
                break;
            }
            ogg_sync_wrote(sync, len);
            continue;
        }
        demux_ogg_get_page_stream(ogg_d, &oss);
        ogg_stream_pagein(oss, page);
        break;
    }
}

static void fixup_vorbis_wf(sh_audio_t *sh, ogg_demuxer_t *od)
{
    int i, offset;
    int ris, init_error = 0;
    ogg_packet op[3];
    unsigned char *buf[3];
    unsigned char *ptr;
    unsigned int len;
    ogg_stream_t *os = &od->subs[sh->ds->id];
    vorbis_comment vc;

    vorbis_info_init(&os->vi);
    vorbis_comment_init(&vc);
    for (i = 0; i < 3; i++) {
        op[i].bytes = ds_get_packet(sh->ds, &(op[i].packet));
        mp_msg(MSGT_DEMUX, MSGL_V, "fixup_vorbis_wf: i=%d, size=%ld\n", i, op[i].bytes);
        if (op[i].bytes < 0) {
            mp_msg(MSGT_DEMUX, MSGL_ERR, "Ogg demuxer error!, fixup_vorbis_wf: bad packet n. %d\n", i);
            return;
        }
        buf[i] = malloc(op[i].bytes);
        if (!buf[i])
            return;
        memcpy(buf[i], op[i].packet, op[i].bytes);

        op[i].b_o_s = (i == 0);
        ris = vorbis_synthesis_headerin(&os->vi, &vc, &op[i]);
        if (ris < 0) {
            init_error = 1;
            mp_msg(MSGT_DECAUDIO, MSGL_ERR, "DEMUX_OGG: header n. %d broken! len=%ld, code: %d\n", i, op[i].bytes, ris);
        }
    }
    vorbis_comment_clear(&vc);
    if (!init_error)
        os->vi_initialized = 1;

    len = op[0].bytes + op[1].bytes + op[2].bytes;
    sh->wf = calloc(1, sizeof(*sh->wf) + len + len / 255 + 64);
    ptr = (unsigned char*)(sh->wf + 1);

    ptr[0] = 2;
    offset = 1;
    offset += store_ughvlc(&ptr[offset], op[0].bytes);
    mp_msg(MSGT_DEMUX, MSGL_V, "demux_ogg, offset after 1st len = %u\n", offset);
    offset += store_ughvlc(&ptr[offset], op[1].bytes);
    mp_msg(MSGT_DEMUX, MSGL_V, "demux_ogg, offset after 2nd len = %u\n", offset);
    for (i = 0; i < 3; i++) {
        mp_msg(MSGT_DEMUX, MSGL_V, "demux_ogg, i=%d, bytes: %ld, offset: %u\n", i, op[i].bytes, offset);
        memcpy(&ptr[offset], buf[i], op[i].bytes);
        offset += op[i].bytes;
    }
    sh->wf->cbSize = offset;
    mp_msg(MSGT_DEMUX, MSGL_V, "demux_ogg, extradata size: %d\n", sh->wf->cbSize);
    sh->wf = realloc(sh->wf, sizeof(*sh->wf) + sh->wf->cbSize);

    if (op[0].bytes >= 29) {
        unsigned int br;
        int nombr, minbr, maxbr;

        ptr = buf[0];
        sh->channels   = ptr[11];
        sh->samplerate = sh->wf->nSamplesPerSec = AV_RL32(&ptr[12]);
        maxbr = AV_RL32(&ptr[16]);  //max
        nombr = AV_RL32(&ptr[20]);  //nominal
        minbr = AV_RL32(&ptr[24]);  //minimum

        if (maxbr == -1)
            maxbr = 0;
        if (nombr == -1)
            nombr = 0;
        if (minbr == -1)
            minbr = 0;

        br = maxbr / 8;
        if (!br)
            br = nombr / 8;
        if (!br)
            br = minbr / 8;
        sh->wf->nAvgBytesPerSec = br;
        sh->wf->wBitsPerSample  = 16;
        sh->samplesize = (sh->wf->wBitsPerSample + 7) / 8;

        mp_msg(MSGT_DEMUX, MSGL_V,
               "demux_ogg, vorbis stream features are: channels: %d, srate: %d, bitrate: %d, max: %u, nominal: %u, min: %u\n",
               sh->channels, sh->samplerate, sh->wf->nAvgBytesPerSec,
               maxbr, nombr, minbr);
    }
    free(buf[2]);
    free(buf[1]);
    free(buf[0]);
}

/// Open an ogg physical stream
// Not static because it's used also in demuxer_avi.c
int demux_ogg_open(demuxer_t *demuxer)
{
    ogg_demuxer_t *ogg_d;
    stream_t *s;
    char *buf;
    int np, s_no, n_audio = 0, n_video = 0;
    int audio_id = -1, video_id = -1, text_id = -1;
    ogg_sync_state *sync;
    ogg_page *page;
    ogg_packet pack;
    sh_audio_t *sh_a;
    sh_video_t *sh_v;

#ifdef CONFIG_ICONV
    subcp_open(NULL);
#endif

    s = demuxer->stream;

    demuxer->priv = ogg_d = calloc(1, sizeof(*ogg_d));
    sync = &ogg_d->sync;
    page = &ogg_d->page;

    ogg_sync_init(sync);

    while (1) {
        /// Try to get a page
        ogg_d->pos += ogg_d->last_size;
        np = ogg_sync_pageseek(sync, page);
        /// Error
        if (np < 0) {
            mp_msg(MSGT_DEMUX, MSGL_DBG2, "Ogg demuxer : Bad page sync\n");
            goto err_out;
        }
        /// Need some more data
        if (np == 0) {
            int len;

            buf = ogg_sync_buffer(sync, BLOCK_SIZE);
            len = stream_read(s, buf, BLOCK_SIZE);
            if (len == 0 && s->eof) {
                goto err_out;
            }
            ogg_sync_wrote(sync, len);
            continue;
        }
        ogg_d->last_size = np;
        // We got one page now

        if (!ogg_page_bos(page)) { // It's not a beginning page
            // Header parsing end here, we need to get the page otherwise it will be lost
            int id = demux_ogg_get_page_stream(ogg_d, NULL);
            if (id >= 0)
                ogg_stream_pagein(&ogg_d->subs[id].stream, page);
            else
                mp_msg(MSGT_DEMUX, MSGL_ERR,
                       "Ogg : Warning found none bos page from unknown stream %d\n",
                       ogg_page_serialno(page));
            break;
        }

        /// Init  the data structure needed for a logical stream
        ogg_d->subs = realloc_struct(ogg_d->subs, ogg_d->num_sub+1,
                                     sizeof(ogg_stream_t));
        memset(&ogg_d->subs[ogg_d->num_sub], 0, sizeof(ogg_stream_t));
        /// Get the stream serial number
        s_no = ogg_page_serialno(page);
        ogg_stream_init(&ogg_d->subs[ogg_d->num_sub].stream, s_no);
        mp_msg(MSGT_DEMUX, MSGL_DBG2,
               "Ogg : Found a stream with serial=%d\n", s_no);
        // Take the first page
        ogg_stream_pagein(&ogg_d->subs[ogg_d->num_sub].stream, page);
        // Get first packet of the page
        ogg_stream_packetout(&ogg_d->subs[ogg_d->num_sub].stream, &pack);

        // Reset our vars
        sh_a = NULL;
        sh_v = NULL;

        ogg_d->subs[ogg_d->num_sub].ogg_d = ogg_d;

        // Check for Vorbis
        if (pack.bytes >= 7 && !strncmp(&pack.packet[1], "vorbis", 6)) {
            sh_a = new_sh_audio_aid(demuxer, ogg_d->num_sub, n_audio);
            sh_a->format = FOURCC_VORBIS;
            ogg_d->subs[ogg_d->num_sub].vorbis = 1;
            ogg_d->subs[ogg_d->num_sub].id     = n_audio;
            n_audio++;
            mp_msg(MSGT_DEMUX, MSGL_INFO,
                   "[Ogg] stream %d: audio (Vorbis), -aid %d\n",
                   ogg_d->num_sub, n_audio - 1);
        } else if (pack.bytes >= 80 && !strncmp(pack.packet, "Speex", 5)) {
            sh_a = new_sh_audio_aid(demuxer, ogg_d->num_sub, n_audio);
            sh_a->wf         = calloc(1, sizeof(*sh_a->wf) + pack.bytes);
            sh_a->format     = FOURCC_SPEEX;
            sh_a->samplerate = sh_a->wf->nSamplesPerSec = AV_RL32(&pack.packet[36]);
            sh_a->channels   = sh_a->wf->nChannels = AV_RL32(&pack.packet[48]);
            sh_a->wf->wFormatTag      = sh_a->format;
            sh_a->wf->nAvgBytesPerSec = AV_RL32(&pack.packet[52]);
            sh_a->wf->nBlockAlign     = 0;
            sh_a->wf->wBitsPerSample  = 16;
            sh_a->samplesize = 2;
            sh_a->wf->cbSize = pack.bytes;
            memcpy(&sh_a->wf[1], pack.packet, pack.bytes);

            ogg_d->subs[ogg_d->num_sub].samplerate = sh_a->samplerate;
            ogg_d->subs[ogg_d->num_sub].speex      = 1;
            ogg_d->subs[ogg_d->num_sub].id         = n_audio;
            n_audio++;
            mp_msg(MSGT_DEMUX, MSGL_INFO,
                   "[Ogg] stream %d: audio (Speex), -aid %d\n",
                   ogg_d->num_sub, n_audio - 1);

            // check for Theora
#ifdef CONFIG_OGGTHEORA
        } else if (pack.bytes >= 7 && !strncmp (&pack.packet[1], "theora", 6)) {
            int errorCode = 0;
            theora_info inf;
            theora_comment cc;

            theora_info_init (&inf);
            theora_comment_init (&cc);

            errorCode = theora_decode_header (&inf, &cc, &pack);
            if (errorCode) {
                mp_msg(MSGT_DEMUX, MSGL_ERR,
                       "Theora header parsing failed: %i \n", errorCode);
            } else {
                sh_v = new_sh_video_vid(demuxer, ogg_d->num_sub, n_video);

                sh_v->bih = calloc(1, sizeof(*sh_v->bih));
                sh_v->bih->biSize        = sizeof(*sh_v->bih);
                sh_v->bih->biCompression = sh_v->format = FOURCC_THEORA;
                sh_v->fps = ((double)inf.fps_numerator) / (double)inf.fps_denominator;
                sh_v->frametime = ((double)inf.fps_denominator) / (double)inf.fps_numerator;
                sh_v->disp_w = sh_v->bih->biWidth  = inf.frame_width;
                sh_v->disp_h = sh_v->bih->biHeight = inf.frame_height;
                sh_v->bih->biBitCount  = 24;
                sh_v->bih->biPlanes    = 3;
                sh_v->bih->biSizeImage = ((sh_v->bih->biBitCount / 8) * sh_v->bih->biWidth * sh_v->bih->biHeight);
                ogg_d->subs[ogg_d->num_sub].samplerate               = sh_v->fps;
                ogg_d->subs[ogg_d->num_sub].theora                   = 1;
                ogg_d->subs[ogg_d->num_sub].keyframe_frequency_force = inf.keyframe_frequency_force;
                ogg_d->subs[ogg_d->num_sub].id                       = n_video;
                n_video++;
                mp_msg(MSGT_DEMUX, MSGL_INFO,
                       "[Ogg] stream %d: video (Theora v%d.%d.%d), -vid %d\n",
                       ogg_d->num_sub,
                       (int)inf.version_major,
                       (int)inf.version_minor,
                       (int)inf.version_subminor,
                       n_video - 1);
                if (mp_msg_test(MSGT_HEADER, MSGL_V))
                    print_video_header(sh_v->bih, MSGL_V);
            }
            theora_comment_clear(&cc);
            theora_info_clear(&inf);
#endif /* CONFIG_OGGTHEORA */
        } else if (pack.bytes >= 4 && !strncmp (&pack.packet[0], "fLaC", 4)) {
            sh_a = new_sh_audio_aid(demuxer, ogg_d->num_sub, n_audio);
            sh_a->format = mmioFOURCC('f', 'L', 'a', 'C');
            ogg_d->subs[ogg_d->num_sub].id = n_audio;
            n_audio++;
            ogg_d->subs[ogg_d->num_sub].flac = 1;
            sh_a->wf = NULL;
            mp_msg(MSGT_DEMUX, MSGL_INFO,
                   "[Ogg] stream %d: audio (FLAC), -aid %d\n",
                   ogg_d->num_sub, n_audio - 1);
        } else if (pack.bytes >= 51 && !strncmp(&pack.packet[1], "FLAC", 4)) {
            sh_a = new_sh_audio_aid(demuxer, ogg_d->num_sub, n_audio);
            sh_a->format = mmioFOURCC('f', 'L', 'a', 'C');
            ogg_d->subs[ogg_d->num_sub].id = n_audio;
            n_audio++;
            ogg_d->subs[ogg_d->num_sub].flac = 2;
            sh_a->wf = calloc(1, sizeof(*sh_a->wf) + 34);
            sh_a->wf->wFormatTag = sh_a->format;
            sh_a->wf->cbSize     = 34;
            memcpy(&sh_a->wf[1], &pack.packet[17], 34);
            mp_msg(MSGT_DEMUX, MSGL_INFO,
                   "[Ogg] stream %d: audio (FLAC, try 2), -aid %d\n",
                   ogg_d->num_sub, n_audio - 1);

            /// Check for old header
        } else if (pack.bytes >= 142 &&
                   !strncmp(&pack.packet[1], "Direct Show Samples embedded in Ogg", 35)) {

            // Old video header
            if (AV_RL32(pack.packet + 96) == 0x05589f80 && pack.bytes >= 184) {
                sh_v = new_sh_video_vid(demuxer, ogg_d->num_sub, n_video);
                sh_v->bih = calloc(1, sizeof(*sh_v->bih));
                sh_v->bih->biSize        = sizeof(*sh_v->bih);
                sh_v->bih->biCompression = sh_v->format = mmioFOURCC(pack.packet[68], pack.packet[69],
                                                                     pack.packet[70], pack.packet[71]);
                sh_v->frametime = AV_RL64(pack.packet + 164) * 0.0000001;
                sh_v->fps    = 1 / sh_v->frametime;
                sh_v->disp_w = sh_v->bih->biWidth = AV_RL32(pack.packet + 176);
                sh_v->disp_h = sh_v->bih->biHeight = AV_RL32(pack.packet + 180);
                sh_v->bih->biBitCount = AV_RL16(pack.packet + 182);
                if (!sh_v->bih->biBitCount)
                    sh_v->bih->biBitCount = 24; // hack, FIXME
                sh_v->bih->biPlanes    = 1;
                sh_v->bih->biSizeImage = (sh_v->bih->biBitCount >> 3) * sh_v->bih->biWidth * sh_v->bih->biHeight;

                ogg_d->subs[ogg_d->num_sub].samplerate = sh_v->fps;
                ogg_d->subs[ogg_d->num_sub].id         = n_video;
                n_video++;
                mp_msg(MSGT_DEMUX, MSGL_INFO,
                       "[Ogg] stream %d: video (FOURCC %c%c%c%c), -vid %d\n",
                       ogg_d->num_sub, pack.packet[68], pack.packet[69],
                       pack.packet[70], pack.packet[71], n_video - 1);
                if (mp_msg_test(MSGT_HEADER, MSGL_V))
                    print_video_header(sh_v->bih, MSGL_V);
                // Old audio header
            } else if (AV_RL32(pack.packet + 96) == 0x05589F81) {
                unsigned int extra_size;

                sh_a = new_sh_audio_aid(demuxer, ogg_d->num_sub, n_audio);
                extra_size = AV_RL16(pack.packet + 140);
                sh_a->wf         = calloc(1, sizeof(*sh_a->wf) + extra_size);
                sh_a->format     = sh_a->wf->wFormatTag     = AV_RL16(pack.packet + 124);
                sh_a->channels   = sh_a->wf->nChannels      = AV_RL16(pack.packet + 126);
                sh_a->samplerate = sh_a->wf->nSamplesPerSec = AV_RL32(pack.packet + 128);
                sh_a->wf->nAvgBytesPerSec = AV_RL32(pack.packet + 132);
                sh_a->wf->nBlockAlign     = AV_RL16(pack.packet + 136);
                sh_a->wf->wBitsPerSample  = AV_RL16(pack.packet + 138);
                sh_a->samplesize = (sh_a->wf->wBitsPerSample + 7) / 8;
                sh_a->wf->cbSize = extra_size;
                if (extra_size > 0)
                    memcpy(sh_a->wf + 1,
                           pack.packet + 142, extra_size);

                ogg_d->subs[ogg_d->num_sub].samplerate = sh_a->samplerate; // * sh_a->channels;
                ogg_d->subs[ogg_d->num_sub].id         = n_audio;
                n_audio++;
                mp_msg(MSGT_DEMUX, MSGL_INFO,
                       "[Ogg] stream %d: audio (format 0x%04x), -aid %d\n",
                       ogg_d->num_sub, sh_a->format, n_audio - 1);
                if (mp_msg_test(MSGT_HEADER, MSGL_V))
                    print_wave_header(sh_a->wf, MSGL_V);
            } else
                mp_msg(MSGT_DEMUX, MSGL_WARN,
                       "Ogg stream %d contains an old header but the header type is unknown\n",
                       ogg_d->num_sub);

            // Check new header
        } else if ((*pack.packet & PACKET_TYPE_BITS ) == PACKET_TYPE_HEADER &&
                   pack.bytes >= (int)sizeof(stream_header) + 1) {
            stream_header *st = (stream_header*)(pack.packet + 1);
            /// New video header
            if (strncmp(st->streamtype, "video", 5) == 0) {
                sh_v = new_sh_video_vid(demuxer, ogg_d->num_sub, n_video);
                sh_v->bih         = calloc(1, sizeof(*sh_v->bih));
                sh_v->bih->biSize = sizeof(*sh_v->bih);
                sh_v->bih->biCompression = sh_v->format = mmioFOURCC(st->subtype[0], st->subtype[1],
                                                                     st->subtype[2], st->subtype[3]);
                sh_v->frametime = AV_RL64(&st->time_unit) * 0.0000001;
                sh_v->fps       = 1.0 / sh_v->frametime;
                sh_v->bih->biBitCount = AV_RL16(&st->bits_per_sample);
                sh_v->disp_w = sh_v->bih->biWidth  = AV_RL32(&st->sh.video.width);
                sh_v->disp_h = sh_v->bih->biHeight = AV_RL32(&st->sh.video.height);
                if (!sh_v->bih->biBitCount)
                    sh_v->bih->biBitCount = 24; // hack, FIXME
                sh_v->bih->biPlanes    = 1;
                sh_v->bih->biSizeImage = (sh_v->bih->biBitCount >> 3) * sh_v->bih->biWidth * sh_v->bih->biHeight;

                ogg_d->subs[ogg_d->num_sub].samplerate = sh_v->fps;
                ogg_d->subs[ogg_d->num_sub].id         = n_video;
                n_video++;
                mp_msg(MSGT_DEMUX, MSGL_INFO,
                       "[Ogg] stream %d: video (FOURCC %c%c%c%c), -vid %d\n",
                       ogg_d->num_sub, st->subtype[0], st->subtype[1],
                       st->subtype[2], st->subtype[3], n_video - 1);
                if (mp_msg_test(MSGT_HEADER, MSGL_V))
                    print_video_header(sh_v->bih, MSGL_V);
                /// New audio header
            } else if (strncmp(st->streamtype, "audio", 5) == 0) {
                char buffer[5];
                unsigned int extra_size = AV_RL32(&st->size) - sizeof(stream_header);
                unsigned int extra_offset = 0;

                memcpy(buffer, st->subtype, 4);
                buffer[4] = '\0';

                /* Nasty workaround. stream_header.size seems not to contain the real
                   size in all cases. There are four extra bytes that are unaccounted
                   for in front of the real codec initialization data _at least_ for
                   AAC. So far I've only seen those bytes being all 0, so we can
                   just skip them here. */
                if ((strtol(buffer, NULL, 16) == 0xff) && (extra_size >= 4)) {
                    extra_size   -= 4;
                    extra_offset  = 4;
                }

                sh_a = new_sh_audio_aid(demuxer, ogg_d->num_sub, n_audio);
                sh_a->wf         = calloc(1, sizeof(*sh_a->wf) + extra_size);
                sh_a->format     = sh_a->wf->wFormatTag = strtol(buffer, NULL, 16);
                sh_a->channels   = sh_a->wf->nChannels  = AV_RL16(&st->sh.audio.channels);
                sh_a->samplerate = sh_a->wf->nSamplesPerSec = AV_RL64(&st->samples_per_unit);
                sh_a->wf->nAvgBytesPerSec = AV_RL32(&st->sh.audio.avgbytespersec);
                sh_a->wf->nBlockAlign     = AV_RL16(&st->sh.audio.blockalign);
                sh_a->wf->wBitsPerSample  = AV_RL16(&st->bits_per_sample);
                sh_a->samplesize = (sh_a->wf->wBitsPerSample + 7) / 8;
                sh_a->wf->cbSize = extra_size;
                if (extra_size)
                    memcpy(sh_a->wf+1,
                           ((char *)(st+1))+extra_offset, extra_size);

                ogg_d->subs[ogg_d->num_sub].samplerate = sh_a->samplerate; // * sh_a->channels;
                ogg_d->subs[ogg_d->num_sub].id = n_audio;
                n_audio++;
                mp_msg(MSGT_DEMUX, MSGL_INFO,
                       "[Ogg] stream %d: audio (format 0x%04x), -aid %d\n",
                       ogg_d->num_sub, sh_a->format, n_audio - 1);
                if (mp_msg_test(MSGT_HEADER, MSGL_V))
                    print_wave_header(sh_a->wf, MSGL_V);

                /// Check for text (subtitles) header
            } else if (strncmp(st->streamtype, "text", 4) == 0) {
                mp_msg(MSGT_DEMUX, MSGL_INFO,
                       "[Ogg] stream %d: subtitles (SRT-like text subtitles), -sid %d\n",
                       ogg_d->num_sub, ogg_d->n_text);
                ogg_d->subs[ogg_d->num_sub].samplerate = AV_RL64(&st->time_unit) / 10;
                ogg_d->subs[ogg_d->num_sub].text       = 1;
                ogg_d->subs[ogg_d->num_sub].id         = ogg_d->n_text;
                if (demuxer->sub->id == ogg_d->n_text)
                    text_id = ogg_d->num_sub;
                new_sh_sub(demuxer, ogg_d->n_text);
                ogg_d->n_text++;
                ogg_d->text_ids = realloc_struct(ogg_d->text_ids, ogg_d->n_text, sizeof(*ogg_d->text_ids));
                ogg_d->text_ids[ogg_d->n_text - 1] = ogg_d->num_sub;
                ogg_d->text_langs = realloc_struct(ogg_d->text_langs, ogg_d->n_text, sizeof(*ogg_d->text_langs));
                ogg_d->text_langs[ogg_d->n_text - 1] = NULL;
                //// Unknown header type
            } else
                mp_msg(MSGT_DEMUX, MSGL_ERR,
                       "Ogg stream %d has a header marker but is of an unknown type\n",
                       ogg_d->num_sub);
            /// Unknown (invalid ?) header
        } else
            mp_msg(MSGT_DEMUX, MSGL_ERR,
                   "Ogg stream %d is of an unknown type\n",
                   ogg_d->num_sub);

        if (sh_a || sh_v) {
            demux_stream_t *ds = NULL;
            if (sh_a) {
                // If the audio stream is not defined we took the first one
                if (demuxer->audio->id == -1) {
                    demuxer->audio->id = n_audio - 1;
                    //if (sh_a->wf) print_wave_header(sh_a->wf, MSGL_INFO);
                }
                /// Is it the stream we want
                if (demuxer->audio->id == n_audio - 1) {
                    demuxer->audio->sh = sh_a;
                    sh_a->ds = demuxer->audio;
                    ds = demuxer->audio;
                    audio_id = ogg_d->num_sub;
                }
            }
            if (sh_v) {
                /// Also for video
                if (demuxer->video->id == -1) {
                    demuxer->video->id = n_video - 1;
                    //if (sh_v->bih) print_video_header(sh_v->bih, MSGL_INFO);
                }
                if (demuxer->video->id == n_video - 1) {
                    demuxer->video->sh = sh_v;
                    sh_v->ds = demuxer->video;
                    ds = demuxer->video;
                    video_id = ogg_d->num_sub;
                }
            }
            /// Add the header packets if the stream isn't seekable
            if (ds && !s->end_pos) {
                /// Finish the page, otherwise packets will be lost
                do {
                    demux_ogg_add_packet(ds, &ogg_d->subs[ogg_d->num_sub],
                                         ogg_d->num_sub, &pack);
                } while (ogg_stream_packetout(&ogg_d->subs[ogg_d->num_sub].stream, &pack) == 1);
            }
        }
        ogg_d->num_sub++;
    }

    if (!n_video && !n_audio) {
        goto err_out;
    }

    if (!n_video || video_id < 0)
        demuxer->video->id = -2;
    else
        demuxer->video->id = video_id;
    if (!n_audio || audio_id < 0)
        demuxer->audio->id = -2;
    else
        demuxer->audio->id = audio_id;
    /* Disable the subs only if there are no text streams at all.
       Otherwise the stream to display might be chosen later when the comment
       packet is encountered and the user used -slang instead of -sid. */
    if (!ogg_d->n_text)
        demuxer->sub->id = -2;
    else if (text_id >= 0) {
        demuxer->sub->id = text_id;
        mp_msg(MSGT_DEMUX, MSGL_V,
               "Ogg demuxer: Displaying subtitle stream id %d\n", text_id);
    }

    ogg_d->final_granulepos   = 0;
    ogg_d->initial_granulepos = MP_NOPTS_VALUE;
    if (!s->end_pos) {
        demuxer->seekable = 0;
    } else {
        demuxer->movi_start = s->start_pos; // Needed for XCD (Ogg written in MODE2)
        demuxer->movi_end   = s->end_pos;
        demuxer->seekable   = 1;
        demux_ogg_scan_stream(demuxer);
    }
    if (ogg_d->initial_granulepos == MP_NOPTS_VALUE)
        ogg_d->initial_granulepos = 0;
    ogg_d->duration = ogg_d->final_granulepos - ogg_d->initial_granulepos;

    mp_msg(MSGT_DEMUX, MSGL_V,
           "Ogg demuxer : found %d audio stream%s, %d video stream%s and %d text stream%s\n",
           n_audio, n_audio > 1 ? "s" : "",
           n_video, n_video > 1 ? "s" : "",
           ogg_d->n_text, ogg_d->n_text > 1 ? "s" : "");

    sh_a = demuxer->audio->sh;
    if (sh_a && sh_a->format == FOURCC_VORBIS)
        fixup_vorbis_wf(sh_a, ogg_d);

    return DEMUXER_TYPE_OGG;

err_out:
    return 0;
}

static int demux_ogg_fill_buffer(demuxer_t *d, demux_stream_t *dsds)
{
    ogg_demuxer_t *ogg_d;
    stream_t *s;
    demux_stream_t *ds;
    ogg_sync_state *sync;
    ogg_stream_state *os;
    ogg_page *page;
    ogg_packet pack;
    int np = 0, id=0;

    s = d->stream;
    ogg_d = d->priv;
    sync = &ogg_d->sync;
    page = &ogg_d->page;

    /// Find the stream we are working on
    if ((id = demux_ogg_get_page_stream(ogg_d, &os)) < 0) {
        mp_msg(MSGT_DEMUX, MSGL_ERR, "Ogg demuxer : can't get current stream\n");
        return 0;
    }

    while (1) {
        np = 0;
        ds = NULL;
        /// Try to get some packet from the current page
        while ((np = ogg_stream_packetout(os, &pack)) != 1) {
            /// No packet we go the next page
            if (np == 0) {
                while (1) {
                    int pa, len;
                    char *buf;

                    ogg_d->pos += ogg_d->last_size;
                    /// Get the next page from the physical stream
                    while ((pa = ogg_sync_pageseek(sync, page)) <= 0) {
                        /// Error : we skip some bytes
                        if (pa < 0) {
                            mp_msg(MSGT_DEMUX, MSGL_WARN,
                                   "Ogg : Page out not synced, we skip some bytes\n");
                            ogg_d->pos -= pa;
                            continue;
                        }
                        /// We need more data
                        buf = ogg_sync_buffer(sync, BLOCK_SIZE);
                        len = stream_read(s, buf, BLOCK_SIZE);
                        if (len == 0 && s->eof) {
                            mp_msg(MSGT_DEMUX, MSGL_DBG2, "Ogg : Stream EOF !!!!\n");
                            return 0;
                        }
                        ogg_sync_wrote(sync, len);
                    } /// Page loop
                    ogg_d->last_size = pa;
                    /// Find the page's logical stream
                    if ((id = demux_ogg_get_page_stream(ogg_d, &os)) < 0) {
                        mp_msg(MSGT_DEMUX, MSGL_ERR,
                               "Ogg demuxer error : we met an unknown stream\n");
                        return 0;
                    }
                    /// Take the page
                    if (ogg_stream_pagein(os, page) == 0)
                        break;
                    /// Page was invalid => retry
                    mp_msg(MSGT_DEMUX, MSGL_WARN,
                           "Ogg demuxer : got invalid page !!!!!\n");
                    ogg_d->pos += ogg_d->last_size;
                }
            } else /// Packet was corrupted
                mp_msg(MSGT_DEMUX, MSGL_WARN,
                       "Ogg : bad packet in stream %d\n", id);
        } /// Packet loop

        /// Is the actual logical stream in use ?
        if (id == d->audio->id)
            ds = d->audio;
        else if (id == d->video->id)
            ds = d->video;
        else if (ogg_d->subs[id].text)
            ds = d->sub;

        if (ds) {
            if (!demux_ogg_add_packet(ds, &ogg_d->subs[id], id, &pack))
                continue; /// Unuseful packet, get another
            d->filepos = ogg_d->pos;
            return 1;
        }
    } /// while (1)
}

/// For avi with Ogg audio stream we have to create an ogg demuxer for this
// stream, then we join the avi and ogg demuxer with a demuxers demuxer
demuxer_t *init_avi_with_ogg(demuxer_t *demuxer)
{
    struct MPOpts *opts = demuxer->opts;
    demuxer_t *od;
    ogg_demuxer_t *ogg_d;
    stream_t *s;
    uint32_t hdrsizes[3];
    demux_packet_t *dp;
    sh_audio_t *sh_audio = demuxer->audio->sh;
    int np;
    uint8_t *extradata = (uint8_t *)(sh_audio->wf + 1);
    int i;
    unsigned char *p = NULL, *buf;
    int plen;

    /// Check that the cbSize is big enough for the following reads
    if (sh_audio->wf->cbSize < 22 + 3 * 4) {
        mp_msg(MSGT_DEMUX, MSGL_ERR,
               "AVI Ogg : Initial audio header is too small !!!!!\n");
        goto fallback;
    }
    /// Get the size of the 3 header packet
    extradata += 22;
    for (i = 0; i < 3; i++) {
        hdrsizes[i] = AV_RL32(extradata);
        extradata += 4;
    }
    //  printf("\n!!!!!! hdr sizes: %d %d %d   \n", hdrsizes[0], hdrsizes[1], hdrsizes[2]);

    /// Check the size
    if (sh_audio->wf->cbSize < 22 + 3 * 4 + hdrsizes[0] + hdrsizes[1] + hdrsizes[2]) {
        mp_msg(MSGT_DEMUX, MSGL_ERR,
               "AVI Ogg : Audio header is too small !!!!!\n");
        goto fallback;
    }

    // Build the ogg demuxer private datas
    ogg_d = calloc(1, sizeof(*ogg_d));
    ogg_d->num_sub = 1;
    ogg_d->subs    = malloc(sizeof(*ogg_d->subs));
    ogg_d->subs[0].vorbis = 1;

    // Init the ogg physical stream
    ogg_sync_init(&ogg_d->sync);

    // Get the first page of the stream : we assume there only 1 logical stream
    while ((np = ogg_sync_pageout(&ogg_d->sync, &ogg_d->page)) <= 0 ) {
        if (np < 0) {
            mp_msg(MSGT_DEMUX, MSGL_ERR,
                   "AVI Ogg error : Can't init using first stream packets\n");
            free(ogg_d);
            goto fallback;
        }
        // Add some data
        plen = ds_get_packet(demuxer->audio, &p);
        buf  = ogg_sync_buffer(&ogg_d->sync, plen);
        memcpy(buf, p, plen);
        ogg_sync_wrote(&ogg_d->sync, plen);
    }
    // Init the logical stream
    mp_msg(MSGT_DEMUX, MSGL_DBG2,
           "AVI Ogg found page with serial %d\n",
           ogg_page_serialno(&ogg_d->page));
    ogg_stream_init(&ogg_d->subs[0].stream, ogg_page_serialno(&ogg_d->page));
    // Write the page
    ogg_stream_pagein(&ogg_d->subs[0].stream, &ogg_d->page);

    // Create the ds_stream and the ogg demuxer
    s = new_ds_stream(demuxer->audio);
    od = new_demuxer(opts, s, DEMUXER_TYPE_OGG, 0, -2, -2, NULL);

    /// Add the header packets in the ogg demuxer audio stream
    for (i = 0; i < 3; i++) {
        dp = new_demux_packet(hdrsizes[i]);
        memcpy(dp->buffer, extradata, hdrsizes[i]);
        ds_add_packet(od->audio, dp);
        extradata += hdrsizes[i];
    }

    // Finish setting up the ogg demuxer
    od->priv = ogg_d;
    sh_audio = new_sh_audio(od, 0);
    od->audio->id = 0;
    od->video->id = -2;
    od->audio->sh = sh_audio;
    sh_audio->ds     = od->audio;
    sh_audio->format = FOURCC_VORBIS;
    fixup_vorbis_wf(sh_audio, ogg_d);

    /// Return the joined demuxers
    return new_demuxers_demuxer(demuxer, od, demuxer);

fallback:
    demuxer->audio->id = -2;
    return demuxer;

}

static void demux_ogg_seek(demuxer_t *demuxer, float rel_seek_secs,
                           float audio_delay, int flags)
{
    ogg_demuxer_t *ogg_d = demuxer->priv;
    ogg_sync_state *sync = &ogg_d->sync;
    ogg_page* page= &ogg_d->page;
    ogg_stream_state *oss;
    ogg_stream_t *os;
    demux_stream_t *ds;
    ogg_packet op;
    float rate;
    int i, sp, first = 1, precision = 1, do_seek = 1;
    vorbis_info *vi = NULL;
    int64_t gp = 0, old_gp;
    off_t pos, old_pos;
    int np;
    int is_gp_valid;
    float pts;
    int is_keyframe;
    int samplesize = 1;
    ogg_int64_t granulepos_orig;

    if (demuxer->video->id >= 0) {
        ds   = demuxer->video;
        rate = ogg_d->subs[ds->id].samplerate;
    } else {
        ds         = demuxer->audio;
        os         = &ogg_d->subs[ds->id];
        vi         = &(os->vi);
        rate       = (float)vi->rate;
        samplesize = ((sh_audio_t*)ds->sh)->samplesize;
    }

    os  = &ogg_d->subs[ds->id];
    oss = &os->stream;

    old_gp  = os->lastpos;
    old_pos = ogg_d->pos;

    //calculate the granulepos to seek to
    gp = flags & SEEK_ABSOLUTE ? ogg_d->initial_granulepos : os->lastpos;
    if (flags & SEEK_FACTOR) {
        if (ogg_d->duration > 0)
            gp += ogg_d->duration * rel_seek_secs;
        else
            gp += rel_seek_secs * (demuxer->movi_end - demuxer->movi_start) * os->lastpos / ogg_d->pos;
    } else
        gp += rel_seek_secs * rate;
    if (gp < 0)
        gp = 0;

    //calculate the filepos to seek to
    if (ogg_d->syncpoints) {
        for (sp = 0; sp < ogg_d->num_syncpoint; sp++)
            if (ogg_d->syncpoints[sp].granulepos >= gp)
                break;

        if (sp >= ogg_d->num_syncpoint)
            return;
        if (sp > 0 && ogg_d->syncpoints[sp].granulepos - gp > gp - ogg_d->syncpoints[sp - 1].granulepos)
            sp--;
        if (ogg_d->syncpoints[sp].granulepos == os->lastpos) {
            if (sp > 0 && gp < os->lastpos)
                sp--;
            if (sp < ogg_d->num_syncpoint - 1 && gp > os->lastpos)
                sp++;
        }
        pos = ogg_d->syncpoints[sp].page_pos;
        precision = 0;
    } else {
        pos = flags & SEEK_ABSOLUTE ? 0 : ogg_d->pos;
        if (flags & SEEK_FACTOR)
            pos += (demuxer->movi_end - demuxer->movi_start) * rel_seek_secs;
        else {
            if (ogg_d->duration > 0) {
                pos += rel_seek_secs * (demuxer->movi_end - demuxer->movi_start) / (ogg_d->duration / rate);
            } else if (os->lastpos > 0) {
                pos += rel_seek_secs * ogg_d->pos / (os->lastpos / rate);
            }
        }
        if (pos < 0)
            pos = 0;
        if (pos > (demuxer->movi_end - demuxer->movi_start))
            pos = demuxer->movi_end - demuxer->movi_start;
    } // if (ogg_d->syncpoints)

    while (1) {
        if (do_seek) {
            stream_seek(demuxer->stream, pos+demuxer->movi_start);
            ogg_sync_reset(sync);
            for (i = 0; i < ogg_d->num_sub; i++) {
                ogg_stream_reset(&ogg_d->subs[i].stream);
                ogg_d->subs[i].lastpos = ogg_d->subs[i].lastsize = 0;
            }
            ogg_d->pos = pos;
            ogg_d->last_size = 0;
            /* we just guess that we reached correct granulepos, in case a
               subsequent search occurs before we read a valid granulepos */
            os->lastpos = gp;
            first = !(ogg_d->syncpoints);
            do_seek=0;
        }
        ogg_d->pos += ogg_d->last_size;
        ogg_d->last_size = 0;
        np = ogg_sync_pageseek(sync, page);

        if (np < 0)
            ogg_d->pos -= np;
        if (np <= 0) { // We need more data
            char *buf = ogg_sync_buffer(sync, BLOCK_SIZE);
            int len = stream_read(demuxer->stream, buf, BLOCK_SIZE);

            if (len == 0 && demuxer->stream->eof) {
                mp_msg(MSGT_DEMUX, MSGL_V, "EOF while trying to seek !!!!\n");
                return;
            }
            ogg_sync_wrote(sync, len);
            continue;
        }
        ogg_d->last_size = np;
        if (ogg_page_serialno(page) != oss->serialno)
            continue;

        if (ogg_stream_pagein(oss, page) != 0)
            continue;

        while (1) {
            np = ogg_stream_packetout(oss, &op);
            if (np < 0)
                continue;
            else if (np == 0)
                break;
            if (first) { /* Discard the first packet as it's probably broken,
                            and we don't have any other means to decide whether it is
                            complete or not. */
                first = 0;
                break;
            }
            is_gp_valid = (op.granulepos >= 0);
            granulepos_orig=op.granulepos;
            demux_ogg_read_packet(os, &op, &pts, &is_keyframe, samplesize);
            if (precision && is_gp_valid) {
                precision--;
                if (abs(gp - op.granulepos) > rate && (op.granulepos != old_gp)) {
                    //prepare another seek because we are off by more than 1s
                    pos += (gp - op.granulepos) * (pos - old_pos) / (op.granulepos - old_gp);
                    if (pos < 0)
                        pos = 0;
                    if (pos < demuxer->movi_end - demuxer->movi_start) {
                        do_seek=1;
                        break;
                    }
                }
            }
            if (is_gp_valid && pos > 0 && old_gp > gp
                    && 2 * (old_gp - op.granulepos) < old_gp - gp) {
                /* prepare another seek because looking for a syncpoint
                   destroyed the backward search */
                pos = old_pos - 1.5 * (old_pos - pos);
                if (pos < 0)
                    pos = 0;
                if (pos < demuxer->movi_end - demuxer->movi_start) {
                    do_seek=1;
                    break;
                }
            }
            if (!precision && (is_keyframe || os->vorbis || os->speex)) {
                if (sub_clear_text(&ogg_sub, MP_NOPTS_VALUE)) {
                    vo_sub = &ogg_sub;
                    vo_osd_changed(OSDTYPE_SUBTITLE);
                }
                op.granulepos=granulepos_orig;
                demux_ogg_add_packet(ds, os, ds->id, &op);
                return;
            }
        }
    }

    mp_msg(MSGT_DEMUX, MSGL_ERR, "Can't find the good packet :(\n");
}

static void demux_close_ogg(demuxer_t *demuxer)
{
    ogg_demuxer_t *ogg_d = demuxer->priv;
    ogg_stream_t *os = NULL;
    int i;

    if (!ogg_d)
        return;

#ifdef CONFIG_ICONV
    subcp_close();
#endif

    ogg_sync_clear(&ogg_d->sync);
    if (ogg_d->subs) {
        for (i = 0; i < ogg_d->num_sub; i++) {
            os = &ogg_d->subs[i];
            ogg_stream_clear(&os->stream);
            if (os->vi_initialized)
                vorbis_info_clear(&os->vi);
        }
        free(ogg_d->subs);
    }
    free(ogg_d->syncpoints);
    free(ogg_d->text_ids);
    if (ogg_d->text_langs) {
        for (i = 0; i < ogg_d->n_text; i++)
            free(ogg_d->text_langs[i]);
        free(ogg_d->text_langs);
    }
    free(ogg_d);
}

static int demux_ogg_control(demuxer_t *demuxer, int cmd, void *arg)
{
    ogg_demuxer_t *ogg_d = demuxer->priv;
    ogg_stream_t *os;
    float rate;

    if (demuxer->video->id >= 0) {
        os = &ogg_d->subs[demuxer->video->id];
        rate = os->samplerate;
    } else {
        os = &ogg_d->subs[demuxer->audio->id];
        rate = os->vi.rate;
    }

    switch(cmd) {
        case DEMUXER_CTRL_GET_TIME_LENGTH:
            if (ogg_d->duration <= 0)
                return DEMUXER_CTRL_DONTKNOW;
            *(double *)arg = (double)(ogg_d->duration) / rate;
            return DEMUXER_CTRL_GUESS;

        case DEMUXER_CTRL_GET_PERCENT_POS:
            if (ogg_d->duration <= 0)
                return DEMUXER_CTRL_DONTKNOW;
            *(int *)arg = ((os->lastpos - ogg_d->initial_granulepos) * 100) / ogg_d->duration;
            return DEMUXER_CTRL_OK;

        default:
            return DEMUXER_CTRL_NOTIMPL;
    }
}

const demuxer_desc_t demuxer_desc_ogg = {
    "Ogg demuxer",
    "ogg",
    "Ogg",
    "?",
    "",
    DEMUXER_TYPE_OGG,
    1, // safe autodetect
    demux_ogg_open,
    demux_ogg_fill_buffer,
    NULL,
    demux_close_ogg,
    demux_ogg_seek,
    demux_ogg_control
};