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 33typedef 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 42static 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 49 ast = avformat_new_stream(s, NULL); 50 if (!ast) 51 return AVERROR(ENOMEM); 52 53 vst = avformat_new_stream(s, NULL); 54 if (!vst) 55 return AVERROR(ENOMEM); 56 57 if (ff_alloc_extradata(vst->codec, 2)) 58 return AVERROR(ENOMEM); 59 60 version = avio_r8(pb); 61 vst->codec->extradata[0] = avio_r8(pb); 62 vst->codec->extradata[1] = avio_r8(pb); 63 frames_count = avio_rl32(pb); 64 msecs_per_frame = avio_rl32(pb); 65 vst->codec->width = avio_rl16(pb); 66 vst->codec->height = avio_rl16(pb); 67 avio_r8(pb); 68 ast->codec->sample_rate = avio_rl16(pb); 69 mvi->audio_data_size = avio_rl32(pb); 70 avio_r8(pb); 71 player_version = avio_rl32(pb); 72 avio_rl16(pb); 73 avio_r8(pb); 74 75 if (frames_count == 0 || mvi->audio_data_size == 0) 76 return AVERROR_INVALIDDATA; 77 78 if (version != 7 || player_version > 213) { 79 av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version); 80 return AVERROR_INVALIDDATA; 81 } 82 83 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); 84 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; 85 ast->codec->codec_id = AV_CODEC_ID_PCM_U8; 86 ast->codec->channels = 1; 87 ast->codec->channel_layout = AV_CH_LAYOUT_MONO; 88 ast->codec->bits_per_coded_sample = 8; 89 ast->codec->bit_rate = ast->codec->sample_rate * 8; 90 91 avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000); 92 vst->avg_frame_rate = av_inv_q(vst->time_base); 93 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; 94 vst->codec->codec_id = AV_CODEC_ID_MOTIONPIXELS; 95 96 mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24; 97 98 mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count; 99 if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) { 100 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 return AVERROR_INVALIDDATA; 104 } 105 106 mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size; 107 mvi->audio_size_left = mvi->audio_data_size; 108 109 return 0; 110} 111 112static int read_packet(AVFormatContext *s, AVPacket *pkt) 113{ 114 int ret, count; 115 MviDemuxContext *mvi = s->priv_data; 116 AVIOContext *pb = s->pb; 117 118 if (mvi->video_frame_size == 0) { 119 mvi->video_frame_size = (mvi->get_int)(pb); 120 if (mvi->audio_size_left == 0) 121 return AVERROR(EIO); 122 count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS; 123 if (count > mvi->audio_size_left) 124 count = mvi->audio_size_left; 125 if ((ret = av_get_packet(pb, pkt, count)) < 0) 126 return ret; 127 pkt->stream_index = MVI_AUDIO_STREAM_INDEX; 128 mvi->audio_size_left -= count; 129 mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS); 130 } else { 131 if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0) 132 return ret; 133 pkt->stream_index = MVI_VIDEO_STREAM_INDEX; 134 mvi->video_frame_size = 0; 135 } 136 return 0; 137} 138 139AVInputFormat 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}; 147