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  1. /*
  2.  * Discworld II BMV demuxer
  3.  * Copyright (c) 2011 Konstantin Shishkov.
  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. #include "libavutil/channel_layout.h"
  23. #include "avformat.h"
  24. #include "internal.h"
  25.  
  26. enum BMVFlags {
  27.     BMV_NOP = 0,
  28.     BMV_END,
  29.     BMV_DELTA,
  30.     BMV_INTRA,
  31.  
  32.     BMV_AUDIO   = 0x20,
  33. };
  34.  
  35. typedef struct BMVContext {
  36.     uint8_t *packet;
  37.     int      size;
  38.     int      get_next;
  39.     int64_t  audio_pos;
  40. } BMVContext;
  41.  
  42. static int bmv_read_header(AVFormatContext *s)
  43. {
  44.     AVStream *st, *ast;
  45.     BMVContext *c = s->priv_data;
  46.  
  47.     st = avformat_new_stream(s, 0);
  48.     if (!st)
  49.         return AVERROR(ENOMEM);
  50.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  51.     st->codec->codec_id   = AV_CODEC_ID_BMV_VIDEO;
  52.     st->codec->width      = 640;
  53.     st->codec->height     = 429;
  54.     st->codec->pix_fmt    = AV_PIX_FMT_PAL8;
  55.     avpriv_set_pts_info(st, 16, 1, 12);
  56.     ast = avformat_new_stream(s, 0);
  57.     if (!ast)
  58.         return AVERROR(ENOMEM);
  59.     ast->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
  60.     ast->codec->codec_id        = AV_CODEC_ID_BMV_AUDIO;
  61.     ast->codec->channels        = 2;
  62.     ast->codec->channel_layout  = AV_CH_LAYOUT_STEREO;
  63.     ast->codec->sample_rate     = 22050;
  64.     avpriv_set_pts_info(ast, 16, 1, 22050);
  65.  
  66.     c->get_next  = 1;
  67.     c->audio_pos = 0;
  68.     return 0;
  69. }
  70.  
  71. static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt)
  72. {
  73.     BMVContext *c = s->priv_data;
  74.     int type, err;
  75.  
  76.     while (c->get_next) {
  77.         if (s->pb->eof_reached)
  78.             return AVERROR_EOF;
  79.         type = avio_r8(s->pb);
  80.         if (type == BMV_NOP)
  81.             continue;
  82.         if (type == BMV_END)
  83.             return AVERROR_EOF;
  84.         c->size = avio_rl24(s->pb);
  85.         if (!c->size)
  86.             return AVERROR_INVALIDDATA;
  87.         if ((err = av_reallocp(&c->packet, c->size + 1)) < 0)
  88.             return err;
  89.         c->packet[0] = type;
  90.         if (avio_read(s->pb, c->packet + 1, c->size) != c->size)
  91.             return AVERROR(EIO);
  92.         if (type & BMV_AUDIO) {
  93.             int audio_size = c->packet[1] * 65 + 1;
  94.             if (audio_size >= c->size) {
  95.                 av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n",
  96.                        audio_size, c->size);
  97.                 return AVERROR_INVALIDDATA;
  98.             }
  99.             if (av_new_packet(pkt, audio_size) < 0)
  100.                 return AVERROR(ENOMEM);
  101.             memcpy(pkt->data, c->packet + 1, pkt->size);
  102.             pkt->stream_index = 1;
  103.             pkt->pts          = c->audio_pos;
  104.             pkt->duration     = c->packet[1] * 32;
  105.             c->audio_pos += pkt->duration;
  106.             c->get_next   = 0;
  107.             return pkt->size;
  108.         } else
  109.             break;
  110.     }
  111.     if (av_new_packet(pkt, c->size + 1) < 0)
  112.         return AVERROR(ENOMEM);
  113.     pkt->stream_index = 0;
  114.     c->get_next = 1;
  115.     memcpy(pkt->data, c->packet, pkt->size);
  116.     return pkt->size;
  117. }
  118.  
  119. static int bmv_read_close(AVFormatContext *s)
  120. {
  121.     BMVContext *c = s->priv_data;
  122.  
  123.     av_freep(&c->packet);
  124.  
  125.     return 0;
  126. }
  127.  
  128. AVInputFormat ff_bmv_demuxer = {
  129.     .name           = "bmv",
  130.     .long_name      = NULL_IF_CONFIG_SMALL("Discworld II BMV"),
  131.     .priv_data_size = sizeof(BMVContext),
  132.     .read_header    = bmv_read_header,
  133.     .read_packet    = bmv_read_packet,
  134.     .read_close     = bmv_read_close,
  135.     .extensions     = "bmv",
  136. };
  137.