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 "avformat.h" 23 24#define MVI_FRAC_BITS 10 25 26#define MVI_AUDIO_STREAM_INDEX 0 27#define MVI_VIDEO_STREAM_INDEX 1 28 29typedef struct MviDemuxContext { 30 unsigned int (*get_int)(ByteIOContext *); 31 uint32_t audio_data_size; 32 uint64_t audio_size_counter; 33 uint64_t audio_frame_size; 34 int audio_size_left; 35 int video_frame_size; 36} MviDemuxContext; 37 38static int read_header(AVFormatContext *s, AVFormatParameters *ap) 39{ 40 MviDemuxContext *mvi = s->priv_data; 41 ByteIOContext *pb = s->pb; 42 AVStream *ast, *vst; 43 unsigned int version, frames_count, msecs_per_frame, player_version; 44 45 ast = av_new_stream(s, 0); 46 if (!ast) 47 return AVERROR(ENOMEM); 48 49 vst = av_new_stream(s, 0); 50 if (!vst) 51 return AVERROR(ENOMEM); 52 53 vst->codec->extradata_size = 2; 54 vst->codec->extradata = av_mallocz(2 + FF_INPUT_BUFFER_PADDING_SIZE); 55 56 version = get_byte(pb); 57 vst->codec->extradata[0] = get_byte(pb); 58 vst->codec->extradata[1] = get_byte(pb); 59 frames_count = get_le32(pb); 60 msecs_per_frame = get_le32(pb); 61 vst->codec->width = get_le16(pb); 62 vst->codec->height = get_le16(pb); 63 get_byte(pb); 64 ast->codec->sample_rate = get_le16(pb); 65 mvi->audio_data_size = get_le32(pb); 66 get_byte(pb); 67 player_version = get_le32(pb); 68 get_le16(pb); 69 get_byte(pb); 70 71 if (frames_count == 0 || mvi->audio_data_size == 0) 72 return AVERROR_INVALIDDATA; 73 74 if (version != 7 || player_version > 213) { 75 av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version); 76 return AVERROR_INVALIDDATA; 77 } 78 79 av_set_pts_info(ast, 64, 1, ast->codec->sample_rate); 80 ast->codec->codec_type = CODEC_TYPE_AUDIO; 81 ast->codec->codec_id = CODEC_ID_PCM_U8; 82 ast->codec->channels = 1; 83 ast->codec->bits_per_coded_sample = 8; 84 ast->codec->bit_rate = ast->codec->sample_rate * 8; 85 86 av_set_pts_info(vst, 64, msecs_per_frame, 1000000); 87 vst->codec->codec_type = CODEC_TYPE_VIDEO; 88 vst->codec->codec_id = CODEC_ID_MOTIONPIXELS; 89 vst->codec->pix_fmt = PIX_FMT_RGB555; 90 91 mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? get_le16 : get_le24; 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 ByteIOContext *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 mvi_demuxer = { 128 "mvi", 129 NULL_IF_CONFIG_SMALL("Motion Pixels MVI format"), 130 sizeof(MviDemuxContext), 131 NULL, 132 read_header, 133 read_packet, 134 .extensions = "mvi" 135}; 136