libavformat/jvdec.c

   1 /*
   2  * Bitmap Brothers JV demuxer
   3  * Copyright (c) 2005, 2011 Peter Ross <pross@xvid.org>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Bitmap Brothers JV demuxer
  25  * @author Peter Ross <pross@xvid.org>
  26  */
  27
  28 #include "libavutil/intreadwrite.h"
  29 #include "avformat.h"
  30
  31 typedef struct {
  32     int audio_size;    /** audio packet size (bytes) */
  33     int video_size;    /** video packet size (bytes) */
  34     int palette;       /** frame contains palette change */
  35     int video_type;    /** per-frame video compression type */
  36 } JVFrame;
  37
  38 typedef struct {
  39     JVFrame *frames;
  40     enum {
  41         JV_AUDIO = 0,
  42         JV_VIDEO,
  43         JV_PADDING
  44     } state;
  45     int64_t pts;
  46 } JVDemuxContext;
  47
  48 #define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd."
  49
  50 static int read_probe(AVProbeData *pd)
  51 {
  52     if (pd->buf[0] == 'J' && pd->buf[1] == 'V' &&
  53         !memcmp(pd->buf + 4, MAGIC, FFMIN(strlen(MAGIC), pd->buf_size - 4)))
  54         return AVPROBE_SCORE_MAX;
  55     return 0;
  56 }
  57
  58 static int read_header(AVFormatContext *s,
  59                        AVFormatParameters *ap)
  60 {
  61     JVDemuxContext *jv = s->priv_data;
  62     AVIOContext *pb = s->pb;
  63     AVStream *vst, *ast;
  64     int64_t audio_pts = 0;
  65     int64_t offset;
  66     int i;
  67
  68     avio_skip(pb, 80);
  69
  70     ast = av_new_stream(s, 0);
  71     vst = av_new_stream(s, 1);
  72     if (!ast || !vst)
  73         return AVERROR(ENOMEM);
  74
  75     vst->codec->codec_type  = CODEC_TYPE_VIDEO;
  76     vst->codec->codec_id    = CODEC_ID_JV;
  77     vst->codec->codec_tag   = 0; /* no fourcc */
  78     vst->codec->width       = avio_rl16(pb);
  79     vst->codec->height      = avio_rl16(pb);
  80     vst->nb_frames          =
  81     ast->nb_index_entries   = avio_rl16(pb);
  82     av_set_pts_info(vst, 64, avio_rl16(pb), 1000);
  83
  84     avio_skip(pb, 4);
  85
  86     ast->codec->codec_type  = CODEC_TYPE_AUDIO;
  87     ast->codec->codec_id    = CODEC_ID_PCM_U8;
  88     ast->codec->codec_tag   = 0; /* no fourcc */
  89     ast->codec->sample_rate = avio_rl16(pb);
  90     ast->codec->channels    = 1;
  91     av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
  92
  93     avio_skip(pb, 10);
  94
  95     ast->index_entries = av_malloc(ast->nb_index_entries * sizeof(*ast->index_entries));
  96     if (!ast->index_entries)
  97         return AVERROR(ENOMEM);
  98
  99     jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame));
 100     if (!jv->frames)
 101         return AVERROR(ENOMEM);
 102
 103     offset = 0x68 + ast->nb_index_entries * 16;
 104     for(i = 0; i < ast->nb_index_entries; i++) {
 105         AVIndexEntry *e   = ast->index_entries + i;
 106         JVFrame      *jvf = jv->frames + i;
 107
 108         /* total frame size including audio, video, palette data and padding */
 109         e->size         = avio_rl32(pb);
 110         e->timestamp    = i;
 111         e->pos          = offset;
 112         offset         += e->size;
 113
 114         jvf->audio_size = avio_rl32(pb);
 115         jvf->video_size = avio_rl32(pb);
 116         jvf->palette    = avio_r8(pb);
 117         if (avio_r8(pb))
 118              av_log(s, AV_LOG_WARNING, "unsupported audio codec\n");
 119         jvf->video_type = avio_r8(pb);
 120         avio_skip(pb, 1);
 121
 122         e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE;
 123         audio_pts += jvf->audio_size;
 124
 125         e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0;
 126     }
 127
 128     jv->state = JV_AUDIO;
 129     return 0;
 130 }
 131
 132 static int read_packet(AVFormatContext *s, AVPacket *pkt)
 133 {
 134     JVDemuxContext *jv = s->priv_data;
 135     AVIOContext *pb = s->pb;
 136     AVStream *ast = s->streams[0];
 137
 138     while (!url_feof(s->pb) && jv->pts < ast->nb_index_entries) {
 139         const AVIndexEntry *e   = ast->index_entries + jv->pts;
 140         const JVFrame      *jvf = jv->frames + jv->pts;
 141
 142         switch(jv->state) {
 143         case JV_AUDIO:
 144             jv->state++;
 145             if (jvf->audio_size ) {
 146                 if (av_get_packet(s->pb, pkt, jvf->audio_size) < 0)
 147                     return AVERROR(ENOMEM);
 148                 pkt->stream_index = 0;
 149                 pkt->pts          = e->timestamp;
 150                 pkt->flags       |= PKT_FLAG_KEY;
 151                 return 0;
 152             }
 153         case JV_VIDEO:
 154             jv->state++;
 155             if (jvf->video_size || jvf->palette) {
 156                 int size = jvf->video_size + (jvf->palette ? 768 : 0);
 157                 if (av_new_packet(pkt, size + 5))
 158                     return AVERROR(ENOMEM);
 159
 160                 AV_WL32(pkt->data, jvf->video_size);
 161                 pkt->data[4]      = jvf->video_type;
 162                 if (avio_read(pb, pkt->data + 5, size) < 0)
 163                     return AVERROR(EIO);
 164
 165                 pkt->size         = size + 5;
 166                 pkt->stream_index = 1;
 167                 pkt->pts          = jv->pts;
 168                 if (jvf->video_type != 1)
 169                     pkt->flags |= PKT_FLAG_KEY;
 170                 return 0;
 171             }
 172         case JV_PADDING:
 173             avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size
 174                                         - (jvf->palette ? 768 : 0), 0));
 175             jv->state = JV_AUDIO;
 176             jv->pts++;
 177         }
 178     }
 179
 180     return AVERROR(EIO);
 181 }
 182
 183 static int read_seek(AVFormatContext *s, int stream_index,
 184                      int64_t ts, int flags)
 185 {
 186     JVDemuxContext *jv = s->priv_data;
 187     AVStream *ast = s->streams[0];
 188     int i;
 189
 190     if (flags & (AVSEEK_FLAG_BYTE|AVSEEK_FLAG_FRAME))
 191         return AVERROR_NOTSUPP;
 192
 193     switch(stream_index) {
 194     case 0:
 195         i = av_index_search_timestamp(ast, ts, flags);
 196         break;
 197     case 1:
 198         i = ts;
 199         break;
 200     default:
 201         return 0;
 202     }
 203
 204     if (i < 0 || i >= ast->nb_index_entries)
 205         return 0;
 206
 207     jv->state = JV_AUDIO;
 208     jv->pts   = i;
 209     avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET);
 210     return 0;
 211 }
 212
 213 AVInputFormat ff_jv_demuxer = {
 214     .name           = "jv",
 215     .long_name      = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"),
 216     .priv_data_size = sizeof(JVDemuxContext),
 217     .read_probe     = read_probe,
 218     .read_header    = read_header,
 219     .read_packet    = read_packet,
 220     .read_seek      = read_seek,
 221 };