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