libavformat/mvi.c

   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 <inttypes.h>
  23
  24 #include "libavutil/channel_layout.h"
  25 #include "avformat.h"
  26 #include "demux.h"
  27 #include "internal.h"
  28
  29 #define MVI_FRAC_BITS 10
  30
  31 #define MVI_AUDIO_STREAM_INDEX 0
  32 #define MVI_VIDEO_STREAM_INDEX 1
  33
  34 typedef struct MviDemuxContext {
  35     unsigned int (*get_int)(AVIOContext *);
  36     uint64_t audio_size_counter;
  37     uint64_t audio_frame_size;
  38     int audio_size_left;
  39     int video_frame_size;
  40 } MviDemuxContext;
  41
  42 static int read_header(AVFormatContext *s)
  43 {
  44     MviDemuxContext *mvi = s->priv_data;
  45     AVIOContext *pb = s->pb;
  46     AVStream *ast, *vst;
  47     unsigned int version, frames_count, msecs_per_frame, player_version;
  48     int ret;
  49     int audio_data_size;
  50
  51     ast = avformat_new_stream(s, NULL);
  52     if (!ast)
  53         return AVERROR(ENOMEM);
  54
  55     vst = avformat_new_stream(s, NULL);
  56     if (!vst)
  57         return AVERROR(ENOMEM);
  58
  59     if ((ret = ff_alloc_extradata(vst->codecpar, 2)) < 0)
  60         return ret;
  61
  62     version                  = avio_r8(pb);
  63     vst->codecpar->extradata[0] = avio_r8(pb);
  64     vst->codecpar->extradata[1] = avio_r8(pb);
  65     frames_count             = avio_rl32(pb);
  66     msecs_per_frame          = avio_rl32(pb);
  67     vst->codecpar->width        = avio_rl16(pb);
  68     vst->codecpar->height       = avio_rl16(pb);
  69     avio_r8(pb);
  70     ast->codecpar->sample_rate  = avio_rl16(pb);
  71     audio_data_size             = avio_rl32(pb);
  72     avio_r8(pb);
  73     player_version           = avio_rl32(pb);
  74     avio_rl16(pb);
  75     avio_r8(pb);
  76
  77     if (frames_count == 0 || audio_data_size <= 0)
  78         return AVERROR_INVALIDDATA;
  79
  80     if (version != 7 || player_version > 213) {
  81         av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
  82         return AVERROR_INVALIDDATA;
  83     }
  84
  85     avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
  86     ast->codecpar->codec_type      = AVMEDIA_TYPE_AUDIO;
  87     ast->codecpar->codec_id        = AV_CODEC_ID_PCM_U8;
  88     ast->codecpar->ch_layout       = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
  89     ast->codecpar->bits_per_coded_sample = 8;
  90     ast->codecpar->bit_rate        = ast->codecpar->sample_rate * 8;
  91
  92     avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000);
  93     vst->avg_frame_rate    = av_inv_q(vst->time_base);
  94     vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
  95     vst->codecpar->codec_id   = AV_CODEC_ID_MOTIONPIXELS;
  96
  97     mvi->get_int = (vst->codecpar->width * (int64_t)vst->codecpar->height < (1 << 16)) ? avio_rl16 : avio_rl24;
  98
  99     mvi->audio_frame_size   = ((uint64_t)audio_data_size << MVI_FRAC_BITS) / frames_count;
 100     if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {
 101         av_log(s, AV_LOG_ERROR,
 102                "Invalid audio_data_size (%d) or frames_count (%u)\n",
 103                audio_data_size, frames_count);
 104         return AVERROR_INVALIDDATA;
 105     }
 106
 107     mvi->audio_size_counter = (ast->codecpar->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
 108     mvi->audio_size_left    = audio_data_size;
 109
 110     return 0;
 111 }
 112
 113 static int read_packet(AVFormatContext *s, AVPacket *pkt)
 114 {
 115     int ret, count;
 116     MviDemuxContext *mvi = s->priv_data;
 117     AVIOContext *pb = s->pb;
 118
 119     if (mvi->video_frame_size == 0) {
 120         mvi->video_frame_size = (mvi->get_int)(pb);
 121         if (mvi->audio_size_left == 0)
 122             return AVERROR_INVALIDDATA;
 123         if (mvi->audio_size_counter + 512 > UINT64_MAX - mvi->audio_frame_size ||
 124             mvi->audio_size_counter + 512 + mvi->audio_frame_size >= ((uint64_t)INT32_MAX) << MVI_FRAC_BITS)
 125             return AVERROR_INVALIDDATA;
 126
 127         count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
 128         if (count > mvi->audio_size_left)
 129             count = mvi->audio_size_left;
 130         if ((int64_t)count << MVI_FRAC_BITS > INT_MAX)
 131             return AVERROR_INVALIDDATA;
 132         if ((ret = av_get_packet(pb, pkt, count)) < 0)
 133             return ret;
 134         pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
 135         mvi->audio_size_left -= count;
 136         mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
 137     } else {
 138         if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
 139             return ret;
 140         pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
 141         mvi->video_frame_size = 0;
 142     }
 143     return 0;
 144 }
 145
 146 const FFInputFormat ff_mvi_demuxer = {
 147     .p.name         = "mvi",
 148     .p.long_name    = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"),
 149     .p.extensions   = "mvi",
 150     .priv_data_size = sizeof(MviDemuxContext),
 151     .read_header    = read_header,
 152     .read_packet    = read_packet,
 153 };