LCOV - code coverage report
Current view: top level - libavformat - mvi.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 57 69 82.6 %
Date: 2017-12-12 03:56:30 Functions: 2 2 100.0 %

          Line data    Source code
       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 "internal.h"
      27             : 
      28             : #define MVI_FRAC_BITS 10
      29             : 
      30             : #define MVI_AUDIO_STREAM_INDEX 0
      31             : #define MVI_VIDEO_STREAM_INDEX 1
      32             : 
      33             : typedef struct MviDemuxContext {
      34             :     unsigned int (*get_int)(AVIOContext *);
      35             :     uint32_t audio_data_size;
      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           1 : static int read_header(AVFormatContext *s)
      43             : {
      44           1 :     MviDemuxContext *mvi = s->priv_data;
      45           1 :     AVIOContext *pb = s->pb;
      46             :     AVStream *ast, *vst;
      47             :     unsigned int version, frames_count, msecs_per_frame, player_version;
      48             : 
      49           1 :     ast = avformat_new_stream(s, NULL);
      50           1 :     if (!ast)
      51           0 :         return AVERROR(ENOMEM);
      52             : 
      53           1 :     vst = avformat_new_stream(s, NULL);
      54           1 :     if (!vst)
      55           0 :         return AVERROR(ENOMEM);
      56             : 
      57           1 :     if (ff_alloc_extradata(vst->codecpar, 2))
      58           0 :         return AVERROR(ENOMEM);
      59             : 
      60           1 :     version                  = avio_r8(pb);
      61           1 :     vst->codecpar->extradata[0] = avio_r8(pb);
      62           1 :     vst->codecpar->extradata[1] = avio_r8(pb);
      63           1 :     frames_count             = avio_rl32(pb);
      64           1 :     msecs_per_frame          = avio_rl32(pb);
      65           1 :     vst->codecpar->width        = avio_rl16(pb);
      66           1 :     vst->codecpar->height       = avio_rl16(pb);
      67           1 :     avio_r8(pb);
      68           1 :     ast->codecpar->sample_rate  = avio_rl16(pb);
      69           1 :     mvi->audio_data_size     = avio_rl32(pb);
      70           1 :     avio_r8(pb);
      71           1 :     player_version           = avio_rl32(pb);
      72           1 :     avio_rl16(pb);
      73           1 :     avio_r8(pb);
      74             : 
      75           1 :     if (frames_count == 0 || mvi->audio_data_size == 0)
      76           0 :         return AVERROR_INVALIDDATA;
      77             : 
      78           1 :     if (version != 7 || player_version > 213) {
      79           0 :         av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
      80           0 :         return AVERROR_INVALIDDATA;
      81             :     }
      82             : 
      83           1 :     avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
      84           1 :     ast->codecpar->codec_type      = AVMEDIA_TYPE_AUDIO;
      85           1 :     ast->codecpar->codec_id        = AV_CODEC_ID_PCM_U8;
      86           1 :     ast->codecpar->channels        = 1;
      87           1 :     ast->codecpar->channel_layout  = AV_CH_LAYOUT_MONO;
      88           1 :     ast->codecpar->bits_per_coded_sample = 8;
      89           1 :     ast->codecpar->bit_rate        = ast->codecpar->sample_rate * 8;
      90             : 
      91           1 :     avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000);
      92           1 :     vst->avg_frame_rate    = av_inv_q(vst->time_base);
      93           1 :     vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
      94           1 :     vst->codecpar->codec_id   = AV_CODEC_ID_MOTIONPIXELS;
      95             : 
      96           1 :     mvi->get_int = (vst->codecpar->width * vst->codecpar->height < (1 << 16)) ? avio_rl16 : avio_rl24;
      97             : 
      98           1 :     mvi->audio_frame_size   = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
      99           1 :     if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {
     100           0 :         av_log(s, AV_LOG_ERROR,
     101             :                "Invalid audio_data_size (%"PRIu32") or frames_count (%u)\n",
     102             :                mvi->audio_data_size, frames_count);
     103           0 :         return AVERROR_INVALIDDATA;
     104             :     }
     105             : 
     106           1 :     mvi->audio_size_counter = (ast->codecpar->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
     107           1 :     mvi->audio_size_left    = mvi->audio_data_size;
     108             : 
     109           1 :     return 0;
     110             : }
     111             : 
     112         222 : static int read_packet(AVFormatContext *s, AVPacket *pkt)
     113             : {
     114             :     int ret, count;
     115         222 :     MviDemuxContext *mvi = s->priv_data;
     116         222 :     AVIOContext *pb = s->pb;
     117             : 
     118         222 :     if (mvi->video_frame_size == 0) {
     119         111 :         mvi->video_frame_size = (mvi->get_int)(pb);
     120         111 :         if (mvi->audio_size_left == 0)
     121           0 :             return AVERROR(EIO);
     122         111 :         count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
     123         111 :         if (count > mvi->audio_size_left)
     124           0 :             count = mvi->audio_size_left;
     125         111 :         if ((ret = av_get_packet(pb, pkt, count)) < 0)
     126           0 :             return ret;
     127         111 :         pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
     128         111 :         mvi->audio_size_left -= count;
     129         111 :         mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
     130             :     } else {
     131         111 :         if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
     132           0 :             return ret;
     133         111 :         pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
     134         111 :         mvi->video_frame_size = 0;
     135             :     }
     136         222 :     return 0;
     137             : }
     138             : 
     139             : AVInputFormat ff_mvi_demuxer = {
     140             :     .name           = "mvi",
     141             :     .long_name      = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"),
     142             :     .priv_data_size = sizeof(MviDemuxContext),
     143             :     .read_header    = read_header,
     144             :     .read_packet    = read_packet,
     145             :     .extensions     = "mvi",
     146             : };

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