1/* 2 * Motion Pixels MVI Demuxer 3 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "avformat.h" 23#include "internal.h" 24 25#define MVI_FRAC_BITS 10 26 27#define MVI_AUDIO_STREAM_INDEX 0 28#define MVI_VIDEO_STREAM_INDEX 1 29 30typedef struct MviDemuxContext { 31 unsigned int (*get_int)(AVIOContext *); 32 uint32_t audio_data_size; 33 uint64_t audio_size_counter; 34 uint64_t audio_frame_size; 35 int audio_size_left; 36 int video_frame_size; 37} MviDemuxContext; 38 39static int read_header(AVFormatContext *s, AVFormatParameters *ap) 40{ 41 MviDemuxContext *mvi = s->priv_data; 42 AVIOContext *pb = s->pb; 43 AVStream *ast, *vst; 44 unsigned int version, frames_count, msecs_per_frame, player_version; 45 46 ast = avformat_new_stream(s, NULL); 47 if (!ast) 48 return AVERROR(ENOMEM); 49 50 vst = avformat_new_stream(s, NULL); 51 if (!vst) 52 return AVERROR(ENOMEM); 53 54 vst->codec->extradata_size = 2; 55 vst->codec->extradata = av_mallocz(2 + FF_INPUT_BUFFER_PADDING_SIZE); 56 57 version = avio_r8(pb); 58 vst->codec->extradata[0] = avio_r8(pb); 59 vst->codec->extradata[1] = avio_r8(pb); 60 frames_count = avio_rl32(pb); 61 msecs_per_frame = avio_rl32(pb); 62 vst->codec->width = avio_rl16(pb); 63 vst->codec->height = avio_rl16(pb); 64 avio_r8(pb); 65 ast->codec->sample_rate = avio_rl16(pb); 66 mvi->audio_data_size = avio_rl32(pb); 67 avio_r8(pb); 68 player_version = avio_rl32(pb); 69 avio_rl16(pb); 70 avio_r8(pb); 71 72 if (frames_count == 0 || mvi->audio_data_size == 0) 73 return AVERROR_INVALIDDATA; 74 75 if (version != 7 || player_version > 213) { 76 av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version); 77 return AVERROR_INVALIDDATA; 78 } 79 80 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); 81 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; 82 ast->codec->codec_id = CODEC_ID_PCM_U8; 83 ast->codec->channels = 1; 84 ast->codec->bits_per_coded_sample = 8; 85 ast->codec->bit_rate = ast->codec->sample_rate * 8; 86 87 avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000); 88 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; 89 vst->codec->codec_id = CODEC_ID_MOTIONPIXELS; 90 91 mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24; 92 93 mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count; 94 mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size; 95 mvi->audio_size_left = mvi->audio_data_size; 96 97 return 0; 98} 99 100static int read_packet(AVFormatContext *s, AVPacket *pkt) 101{ 102 int ret, count; 103 MviDemuxContext *mvi = s->priv_data; 104 AVIOContext *pb = s->pb; 105 106 if (mvi->video_frame_size == 0) { 107 mvi->video_frame_size = (mvi->get_int)(pb); 108 if (mvi->audio_size_left == 0) 109 return AVERROR(EIO); 110 count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS; 111 if (count > mvi->audio_size_left) 112 count = mvi->audio_size_left; 113 if ((ret = av_get_packet(pb, pkt, count)) < 0) 114 return ret; 115 pkt->stream_index = MVI_AUDIO_STREAM_INDEX; 116 mvi->audio_size_left -= count; 117 mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS); 118 } else { 119 if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0) 120 return ret; 121 pkt->stream_index = MVI_VIDEO_STREAM_INDEX; 122 mvi->video_frame_size = 0; 123 } 124 return 0; 125} 126 127AVInputFormat ff_mvi_demuxer = { 128 .name = "mvi", 129 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI format"), 130 .priv_data_size = sizeof(MviDemuxContext), 131 .read_header = read_header, 132 .read_packet = read_packet, 133 .extensions = "mvi" 134}; 135