2 * Motion Pixels MVI Demuxer
3 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
5 * This file is part of Libav.
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.
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.
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
24 #define MVI_FRAC_BITS 10
26 #define MVI_AUDIO_STREAM_INDEX 0
27 #define MVI_VIDEO_STREAM_INDEX 1
29 typedef struct MviDemuxContext {
30 unsigned int (*get_int)(AVIOContext *);
31 uint32_t audio_data_size;
32 uint64_t audio_size_counter;
33 uint64_t audio_frame_size;
38 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
40 MviDemuxContext *mvi = s->priv_data;
41 AVIOContext *pb = s->pb;
43 unsigned int version, frames_count, msecs_per_frame, player_version;
45 ast = av_new_stream(s, 0);
47 return AVERROR(ENOMEM);
49 vst = av_new_stream(s, 0);
51 return AVERROR(ENOMEM);
53 vst->codec->extradata_size = 2;
54 vst->codec->extradata = av_mallocz(2 + FF_INPUT_BUFFER_PADDING_SIZE);
56 version = avio_r8(pb);
57 vst->codec->extradata[0] = avio_r8(pb);
58 vst->codec->extradata[1] = avio_r8(pb);
59 frames_count = avio_rl32(pb);
60 msecs_per_frame = avio_rl32(pb);
61 vst->codec->width = avio_rl16(pb);
62 vst->codec->height = avio_rl16(pb);
64 ast->codec->sample_rate = avio_rl16(pb);
65 mvi->audio_data_size = avio_rl32(pb);
67 player_version = avio_rl32(pb);
71 if (frames_count == 0 || mvi->audio_data_size == 0)
72 return AVERROR_INVALIDDATA;
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;
79 av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
80 ast->codec->codec_type = AVMEDIA_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;
86 av_set_pts_info(vst, 64, msecs_per_frame, 1000000);
87 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
88 vst->codec->codec_id = CODEC_ID_MOTIONPIXELS;
90 mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24;
92 mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
93 mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
94 mvi->audio_size_left = mvi->audio_data_size;
99 static int read_packet(AVFormatContext *s, AVPacket *pkt)
102 MviDemuxContext *mvi = s->priv_data;
103 AVIOContext *pb = s->pb;
105 if (mvi->video_frame_size == 0) {
106 mvi->video_frame_size = (mvi->get_int)(pb);
107 if (mvi->audio_size_left == 0)
109 count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
110 if (count > mvi->audio_size_left)
111 count = mvi->audio_size_left;
112 if ((ret = av_get_packet(pb, pkt, count)) < 0)
114 pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
115 mvi->audio_size_left -= count;
116 mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
118 if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
120 pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
121 mvi->video_frame_size = 0;
126 AVInputFormat ff_mvi_demuxer = {
128 NULL_IF_CONFIG_SMALL("Motion Pixels MVI format"),
129 sizeof(MviDemuxContext),