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/channel_layout.h"
  29 #include "libavutil/intreadwrite.h"
  30 #include "libavutil/mem.h"
  31
  32 #include "avformat.h"
  33 #include "demux.h"
  34 #include "internal.h"
  35
  36 #define JV_PREAMBLE_SIZE 5
  37
  38 typedef struct JVFrame {
  39     int audio_size;    /**< audio packet size (bytes) */
  40     int video_size;    /**< video packet size (bytes) */
  41     uint16_t palette_size;  /**< palette size (bytes) */
  42     uint8_t video_type;     /**< per-frame video compression type */
  43 } JVFrame;
  44
  45 typedef struct JVDemuxContext {
  46     JVFrame *frames;
  47     enum {
  48         JV_AUDIO = 0,
  49         JV_VIDEO,
  50         JV_PADDING
  51     } state;
  52     int64_t pts;
  53 } JVDemuxContext;
  54
  55 #define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd."
  56
  57 static int read_probe(const AVProbeData *pd)
  58 {
  59     if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && strlen(MAGIC) + 4 <= pd->buf_size &&
  60         !memcmp(pd->buf + 4, MAGIC, strlen(MAGIC)))
  61         return AVPROBE_SCORE_MAX;
  62     return 0;
  63 }
  64
  65 static int read_close(AVFormatContext *s)
  66 {
  67     JVDemuxContext *jv = s->priv_data;
  68
  69     av_freep(&jv->frames);
  70
  71     return 0;
  72 }
  73
  74 static int read_header(AVFormatContext *s)
  75 {
  76     JVDemuxContext *jv = s->priv_data;
  77     AVIOContext *pb = s->pb;
  78     AVStream *vst, *ast;
  79     FFStream *asti;
  80     int64_t audio_pts = 0;
  81     int64_t offset;
  82
  83     avio_skip(pb, 80);
  84
  85     ast = avformat_new_stream(s, NULL);
  86     vst = avformat_new_stream(s, NULL);
  87     if (!ast || !vst)
  88         return AVERROR(ENOMEM);
  89     asti = ffstream(ast);
  90
  91     vst->codecpar->codec_type  = AVMEDIA_TYPE_VIDEO;
  92     vst->codecpar->codec_id    = AV_CODEC_ID_JV;
  93     vst->codecpar->codec_tag   = 0; /* no fourcc */
  94     vst->codecpar->width       = avio_rl16(pb);
  95     vst->codecpar->height      = avio_rl16(pb);
  96     vst->duration           =
  97     vst->nb_frames          =
  98     asti->nb_index_entries  = avio_rl16(pb);
  99     avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000);
 100
 101     avio_skip(pb, 4);
 102
 103     ast->codecpar->codec_type     = AVMEDIA_TYPE_AUDIO;
 104     ast->codecpar->codec_id       = AV_CODEC_ID_PCM_U8;
 105     ast->codecpar->codec_tag      = 0; /* no fourcc */
 106     ast->codecpar->sample_rate    = avio_rl16(pb);
 107     ast->codecpar->ch_layout      = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
 108     avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
 109
 110     avio_skip(pb, 10);
 111
 112     asti->index_entries = av_malloc(asti->nb_index_entries *
 113                                     sizeof(*asti->index_entries));
 114     if (!asti->index_entries)
 115         return AVERROR(ENOMEM);
 116
 117     jv->frames = av_malloc(asti->nb_index_entries * sizeof(*jv->frames));
 118     if (!jv->frames)
 119         return AVERROR(ENOMEM);
 120     offset = 0x68 + asti->nb_index_entries * 16;
 121     for (int i = 0; i < asti->nb_index_entries; i++) {
 122         AVIndexEntry *e   = asti->index_entries + i;
 123         JVFrame      *jvf = jv->frames + i;
 124
 125         /* total frame size including audio, video, palette data and padding */
 126         e->size      = avio_rl32(pb);
 127         e->timestamp = i;
 128         e->pos       = offset;
 129         offset      += e->size;
 130
 131         jvf->audio_size   = avio_rl32(pb);
 132         jvf->video_size   = avio_rl32(pb);
 133         jvf->palette_size = avio_r8(pb) ? 768 : 0;
 134
 135         if ((jvf->video_size | jvf->audio_size) & ~0xFFFFFF ||
 136             e->size - jvf->audio_size
 137                     - jvf->video_size
 138                     - jvf->palette_size < 0) {
 139             if (s->error_recognition & AV_EF_EXPLODE)
 140                 return AVERROR_INVALIDDATA;
 141             jvf->audio_size   =
 142             jvf->video_size   =
 143             jvf->palette_size = 0;
 144         }
 145
 146         if (avio_r8(pb))
 147             av_log(s, AV_LOG_WARNING, "unsupported audio codec\n");
 148
 149         jvf->video_type = avio_r8(pb);
 150         avio_skip(pb, 1);
 151
 152         e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE;
 153         audio_pts   += jvf->audio_size;
 154
 155         e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0;
 156     }
 157
 158     jv->state = JV_AUDIO;
 159     return 0;
 160 }
 161
 162 static int read_packet(AVFormatContext *s, AVPacket *pkt)
 163 {
 164     JVDemuxContext *jv = s->priv_data;
 165     AVIOContext *pb = s->pb;
 166     AVStream *ast = s->streams[0];
 167     FFStream *const asti = ffstream(ast);
 168     int ret;
 169
 170     while (!avio_feof(s->pb) && jv->pts < asti->nb_index_entries) {
 171         const AVIndexEntry *const e = asti->index_entries + jv->pts;
 172         const JVFrame      *jvf = jv->frames + jv->pts;
 173
 174         switch (jv->state) {
 175         case JV_AUDIO:
 176             jv->state++;
 177             if (jvf->audio_size) {
 178                 if ((ret = av_get_packet(s->pb, pkt, jvf->audio_size)) < 0)
 179                     return ret;
 180                 pkt->stream_index = 0;
 181                 pkt->pts          = e->timestamp;
 182                 pkt->flags       |= AV_PKT_FLAG_KEY;
 183                 return 0;
 184             }
 185         case JV_VIDEO:
 186             jv->state++;
 187             if (jvf->video_size || jvf->palette_size) {
 188                 int size = jvf->video_size + jvf->palette_size;
 189                 if ((ret = av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) < 0)
 190                     return ret;
 191
 192                 AV_WL32(pkt->data, jvf->video_size);
 193                 pkt->data[4] = jvf->video_type;
 194                 ret = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size);
 195                 if (ret < 0)
 196                     return ret;
 197                 if (ret < size) {
 198                     memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0,
 199                            AV_INPUT_BUFFER_PADDING_SIZE);
 200                     pkt->flags |= AV_PKT_FLAG_CORRUPT;
 201                 }
 202                 pkt->size         = ret + JV_PREAMBLE_SIZE;
 203                 pkt->stream_index = 1;
 204                 pkt->pts          = jv->pts;
 205                 if (jvf->video_type != 1)
 206                     pkt->flags |= AV_PKT_FLAG_KEY;
 207                 return 0;
 208             }
 209         case JV_PADDING:
 210             avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size
 211                                         - jvf->palette_size, 0));
 212             jv->state = JV_AUDIO;
 213             jv->pts++;
 214         }
 215     }
 216
 217     if (s->pb->eof_reached)
 218         return AVERROR_EOF;
 219
 220     return AVERROR_INVALIDDATA;
 221 }
 222
 223 static int read_seek(AVFormatContext *s, int stream_index,
 224                      int64_t ts, int flags)
 225 {
 226     JVDemuxContext *jv = s->priv_data;
 227     AVStream *ast = s->streams[0];
 228     FFStream *const asti = ffstream(ast);
 229     int i;
 230
 231     if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
 232         return AVERROR(ENOSYS);
 233
 234     switch (stream_index) {
 235     case 0:
 236         i = av_index_search_timestamp(ast, ts, flags);
 237         break;
 238     case 1:
 239         i = ts;
 240         break;
 241     default:
 242         return 0;
 243     }
 244
 245     if (i < 0 || i >= asti->nb_index_entries)
 246         return 0;
 247     if (avio_seek(s->pb, asti->index_entries[i].pos, SEEK_SET) < 0)
 248         return -1;
 249
 250     jv->state = JV_AUDIO;
 251     jv->pts   = i;
 252     return 0;
 253 }
 254
 255 const FFInputFormat ff_jv_demuxer = {
 256     .p.name         = "jv",
 257     .p.long_name    = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"),
 258     .priv_data_size = sizeof(JVDemuxContext),
 259     .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
 260     .read_probe     = read_probe,
 261     .read_header    = read_header,
 262     .read_packet    = read_packet,
 263     .read_seek      = read_seek,
 264     .read_close     = read_close,
 265 };