format_kate.c 6.71 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232
/* Icecast
 *
 * This program is distributed under the GNU General Public License, version 2.
 * A copy of this license is included with this source.
 *
 * Copyright 2000-2004, Jack Moffitt <jack@xiph.org, 
 *                      Michael Smith <msmith@xiph.org>,
 *                      oddsock <oddsock@xiph.org>,
 *                      Karl Heyes <karl@xiph.org>
 *                      and others (see AUTHORS for details).
 */


/* Ogg codec handler for kate logical streams */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <string.h>
#include <ogg/ogg.h>
#ifdef HAVE_KATE
#include <kate/oggkate.h>
#endif

typedef struct source_tag source_t;

#include "refbuf.h"
#include "format_ogg.h"
#include "format_kate.h"
#include "client.h"
#include "stats.h"

#define CATMODULE "format-kate"
#include "logging.h"


typedef struct _kate_codec_tag
{
    int             headers_done;
#ifdef HAVE_KATE
    kate_info       ki;
    kate_comment    kc;
#endif
    int             num_headers;
    int             granule_shift;
    ogg_int64_t     last_iframe;
    ogg_int64_t     prev_granulepos;
} kate_codec_t;


static void kate_codec_free (ogg_state_t *ogg_info, ogg_codec_t *codec)
{
    kate_codec_t *kate = codec->specific;

    DEBUG0 ("freeing kate codec");
    /* TODO: should i replace with something or just remove
    stats_event (ogg_info->mount, "video_bitrate", NULL);
    stats_event (ogg_info->mount, "video_quality", NULL);
    stats_event (ogg_info->mount, "frame_rate", NULL);
    stats_event (ogg_info->mount, "frame_size", NULL);
    */
#ifdef HAVE_KATE
    kate_info_clear (&kate->ki);
    kate_comment_clear (&kate->kc);
#endif
    ogg_stream_clear (&codec->os);
    free (kate);
    free (codec);
}


/* kate pages are not rebuilt, so here we just for headers and then
 * pass them straight through to the the queue
 */
static refbuf_t *process_kate_page (ogg_state_t *ogg_info, ogg_codec_t *codec, ogg_page *page)
{
    kate_codec_t *kate = codec->specific;
    ogg_packet packet;
    int header_page = 0;
    refbuf_t *refbuf = NULL;
    ogg_int64_t granulepos;

    if (ogg_stream_pagein (&codec->os, page) < 0)
    {
        ogg_info->error = 1;
        return NULL;
    }
    granulepos = ogg_page_granulepos (page);

    while (ogg_stream_packetout (&codec->os, &packet) > 0)
    {
        if (!kate->headers_done)
        {
#ifdef HAVE_KATE
            int ret = kate_ogg_decode_headerin (&kate->ki, &kate->kc, &packet);
            if (ret < 0)
            {
                ogg_info->error = 1;
                WARN0 ("problem with kate header");
                return NULL;
            }
            header_page = 1;
            kate->num_headers = kate->ki.num_headers;
            codec->headers++;
            if (ret > 0)
            {
                kate->headers_done = 1;
                /* TODO: what to replace this with ?
                ogg_info->bitrate += theora->ti.target_bitrate;
                stats_event_args (ogg_info->mount, "video_bitrate", "%ld",
                        (long)theora->ti.target_bitrate);
                stats_event_args (ogg_info->mount, "video_quality", "%ld",
                        (long)theora->ti.quality);
                stats_event_args (ogg_info->mount, "frame_size", "%ld x %ld",
                        (long)theora->ti.frame_width,
                        (long)theora->ti.frame_height);
                stats_event_args (ogg_info->mount, "frame_rate", "%.2f",
                        (float)theora->ti.fps_numerator/theora->ti.fps_denominator);
                */
            }
            continue;
#else
            header_page = (packet.bytes>0 && (packet.packet[0]&0x80));
            if (!header_page)
                break;
            codec->headers++;
            if (packet.packet[0]==0x80)
            {
                if (packet.bytes<64) return NULL;
                /* we peek for the number of headers to expect */
                kate->num_headers = packet.packet[11];
            }
            continue;
#endif
        }

        if (codec->headers < kate->num_headers)
        {
            ogg_info->error = 1;
            ERROR0 ("Not enough header packets");
            return NULL;
        }
    }
    if (header_page)
    {
        format_ogg_attach_header (ogg_info, page);
        return NULL;
    }

    refbuf = make_refbuf_with_page (page);
    /* DEBUG3 ("refbuf %p has pageno %ld, %llu", refbuf, ogg_page_pageno (page), (uint64_t)granulepos); */

    if (codec->possible_start)
    {
        /* we don't bother trying to know where we can start, we'll just
           start whenever we have to, video's more important and in the majority
           of the cases it's ok if we lose an event we're seeking in the middle
           of, as we won't have display artifacts as we'd have with video */
        codec->possible_start->sync_point = 1;
        refbuf_release (codec->possible_start);
        codec->possible_start = NULL;
    }
    if (granulepos != kate->prev_granulepos || granulepos == 0)
    {
        if (codec->possible_start)
            refbuf_release (codec->possible_start);
        refbuf_addref (refbuf);
        codec->possible_start = refbuf;
    }
    kate->prev_granulepos = granulepos;

    return refbuf;
}


/* Check if specified BOS page is the start of a kate stream and
 * if so, create a codec structure for handling it
 */
ogg_codec_t *initial_kate_page (format_plugin_t *plugin, ogg_page *page)
{
    ogg_state_t *ogg_info = plugin->_state;
    ogg_codec_t *codec = calloc (1, sizeof (ogg_codec_t));
    ogg_packet packet;

    kate_codec_t *kate_codec = calloc (1, sizeof (kate_codec_t));

    ogg_stream_init (&codec->os, ogg_page_serialno (page));
    ogg_stream_pagein (&codec->os, page);

#ifdef HAVE_KATE
    kate_info_init (&kate_codec->ki);
    kate_comment_init (&kate_codec->kc);
#endif

    ogg_stream_packetout (&codec->os, &packet);

    DEBUG0("checking for kate codec");
#ifdef HAVE_KATE
    if (kate_ogg_decode_headerin (&kate_codec->ki, &kate_codec->kc, &packet) < 0)
    {
        kate_info_clear (&kate_codec->ki);
        kate_comment_clear (&kate_codec->kc);
        ogg_stream_clear (&codec->os);
        free (kate_codec);
        free (codec);
        return NULL;
    }
#else
    /* we don't have libkate, so we examine the packet magic by hand */
    if ((packet.bytes<9) || memcmp(packet.packet, "\x80kate\0\0\0\0", 9))
    {
        ogg_stream_clear (&codec->os);
        free (kate_codec);
        free (codec);
        return NULL;
    }
#endif

    INFO0 ("seen initial kate header");
    codec->specific = kate_codec;
    codec->process_page = process_kate_page;
    codec->codec_free = kate_codec_free;
    codec->headers = 1;
    codec->name = "Kate";

    format_ogg_attach_header (ogg_info, page);
    ogg_info->codec_sync = codec;
    return codec;
}