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  1. /*
  2.  * Motion Pixels MVI Demuxer
  3.  * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
  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. #define MVI_FRAC_BITS 10
  27.  
  28. #define MVI_AUDIO_STREAM_INDEX 0
  29. #define MVI_VIDEO_STREAM_INDEX 1
  30.  
  31. typedef struct MviDemuxContext {
  32.     unsigned int (*get_int)(AVIOContext *);
  33.     uint32_t audio_data_size;
  34.     uint64_t audio_size_counter;
  35.     uint64_t audio_frame_size;
  36.     int audio_size_left;
  37.     int video_frame_size;
  38. } MviDemuxContext;
  39.  
  40. static int read_header(AVFormatContext *s)
  41. {
  42.     MviDemuxContext *mvi = s->priv_data;
  43.     AVIOContext *pb = s->pb;
  44.     AVStream *ast, *vst;
  45.     unsigned int version, frames_count, msecs_per_frame, player_version;
  46.  
  47.     ast = avformat_new_stream(s, NULL);
  48.     if (!ast)
  49.         return AVERROR(ENOMEM);
  50.  
  51.     vst = avformat_new_stream(s, NULL);
  52.     if (!vst)
  53.         return AVERROR(ENOMEM);
  54.  
  55.     if (ff_alloc_extradata(vst->codec, 2))
  56.         return AVERROR(ENOMEM);
  57.  
  58.     version                  = avio_r8(pb);
  59.     vst->codec->extradata[0] = avio_r8(pb);
  60.     vst->codec->extradata[1] = avio_r8(pb);
  61.     frames_count             = avio_rl32(pb);
  62.     msecs_per_frame          = avio_rl32(pb);
  63.     vst->codec->width        = avio_rl16(pb);
  64.     vst->codec->height       = avio_rl16(pb);
  65.     avio_r8(pb);
  66.     ast->codec->sample_rate  = avio_rl16(pb);
  67.     mvi->audio_data_size     = avio_rl32(pb);
  68.     avio_r8(pb);
  69.     player_version           = avio_rl32(pb);
  70.     avio_rl16(pb);
  71.     avio_r8(pb);
  72.  
  73.     if (frames_count == 0 || mvi->audio_data_size == 0)
  74.         return AVERROR_INVALIDDATA;
  75.  
  76.     if (version != 7 || player_version > 213) {
  77.         av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
  78.         return AVERROR_INVALIDDATA;
  79.     }
  80.  
  81.     avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
  82.     ast->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
  83.     ast->codec->codec_id        = AV_CODEC_ID_PCM_U8;
  84.     ast->codec->channels        = 1;
  85.     ast->codec->channel_layout  = AV_CH_LAYOUT_MONO;
  86.     ast->codec->bits_per_coded_sample = 8;
  87.     ast->codec->bit_rate        = ast->codec->sample_rate * 8;
  88.  
  89.     avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000);
  90.     vst->avg_frame_rate    = av_inv_q(vst->time_base);
  91.     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  92.     vst->codec->codec_id   = AV_CODEC_ID_MOTIONPIXELS;
  93.  
  94.     mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24;
  95.  
  96.     mvi->audio_frame_size   = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
  97.     if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {
  98.         av_log(s, AV_LOG_ERROR, "Invalid audio_data_size (%d) or frames_count (%d)\n",
  99.                mvi->audio_data_size, frames_count);
  100.         return AVERROR_INVALIDDATA;
  101.     }
  102.  
  103.     mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
  104.     mvi->audio_size_left    = mvi->audio_data_size;
  105.  
  106.     return 0;
  107. }
  108.  
  109. static int read_packet(AVFormatContext *s, AVPacket *pkt)
  110. {
  111.     int ret, count;
  112.     MviDemuxContext *mvi = s->priv_data;
  113.     AVIOContext *pb = s->pb;
  114.  
  115.     if (mvi->video_frame_size == 0) {
  116.         mvi->video_frame_size = (mvi->get_int)(pb);
  117.         if (mvi->audio_size_left == 0)
  118.             return AVERROR(EIO);
  119.         count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
  120.         if (count > mvi->audio_size_left)
  121.             count = mvi->audio_size_left;
  122.         if ((ret = av_get_packet(pb, pkt, count)) < 0)
  123.             return ret;
  124.         pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
  125.         mvi->audio_size_left -= count;
  126.         mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
  127.     } else {
  128.         if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
  129.             return ret;
  130.         pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
  131.         mvi->video_frame_size = 0;
  132.     }
  133.     return 0;
  134. }
  135.  
  136. AVInputFormat ff_mvi_demuxer = {
  137.     .name           = "mvi",
  138.     .long_name      = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"),
  139.     .priv_data_size = sizeof(MviDemuxContext),
  140.     .read_header    = read_header,
  141.     .read_packet    = read_packet,
  142.     .extensions     = "mvi",
  143. };
  144.