2 * Motion Pixels MVI Demuxer
3 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/channel_layout.h"
28 #define MVI_FRAC_BITS 10
30 #define MVI_AUDIO_STREAM_INDEX 0
31 #define MVI_VIDEO_STREAM_INDEX 1
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;
42 static int read_header(AVFormatContext *s)
44 MviDemuxContext *mvi = s->priv_data;
45 AVIOContext *pb = s->pb;
47 unsigned int version, frames_count, msecs_per_frame, player_version;
50 ast = avformat_new_stream(s, NULL);
52 return AVERROR(ENOMEM);
54 vst = avformat_new_stream(s, NULL);
56 return AVERROR(ENOMEM);
58 if ((ret = ff_alloc_extradata(vst->codecpar, 2)) < 0)
61 version = avio_r8(pb);
62 vst->codecpar->extradata[0] = avio_r8(pb);
63 vst->codecpar->extradata[1] = avio_r8(pb);
64 frames_count = avio_rl32(pb);
65 msecs_per_frame = avio_rl32(pb);
66 vst->codecpar->width = avio_rl16(pb);
67 vst->codecpar->height = avio_rl16(pb);
69 ast->codecpar->sample_rate = avio_rl16(pb);
70 mvi->audio_data_size = avio_rl32(pb);
72 player_version = avio_rl32(pb);
76 if (frames_count == 0 || mvi->audio_data_size == 0)
77 return AVERROR_INVALIDDATA;
79 if (version != 7 || player_version > 213) {
80 av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
81 return AVERROR_INVALIDDATA;
84 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
85 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
86 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
87 ast->codecpar->channels = 1;
88 ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
89 ast->codecpar->bits_per_coded_sample = 8;
90 ast->codecpar->bit_rate = ast->codecpar->sample_rate * 8;
92 avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000);
93 vst->avg_frame_rate = av_inv_q(vst->time_base);
94 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
95 vst->codecpar->codec_id = AV_CODEC_ID_MOTIONPIXELS;
97 mvi->get_int = (vst->codecpar->width * vst->codecpar->height < (1 << 16)) ? avio_rl16 : avio_rl24;
99 mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
100 if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {
101 av_log(s, AV_LOG_ERROR,
102 "Invalid audio_data_size (%"PRIu32") or frames_count (%u)\n",
103 mvi->audio_data_size, frames_count);
104 return AVERROR_INVALIDDATA;
107 mvi->audio_size_counter = (ast->codecpar->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
108 mvi->audio_size_left = mvi->audio_data_size;
113 static int read_packet(AVFormatContext *s, AVPacket *pkt)
116 MviDemuxContext *mvi = s->priv_data;
117 AVIOContext *pb = s->pb;
119 if (mvi->video_frame_size == 0) {
120 mvi->video_frame_size = (mvi->get_int)(pb);
121 if (mvi->audio_size_left == 0)
123 count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
124 if (count > mvi->audio_size_left)
125 count = mvi->audio_size_left;
126 if ((ret = av_get_packet(pb, pkt, count)) < 0)
128 pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
129 mvi->audio_size_left -= count;
130 mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
132 if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
134 pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
135 mvi->video_frame_size = 0;
140 AVInputFormat ff_mvi_demuxer = {
142 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"),
143 .priv_data_size = sizeof(MviDemuxContext),
144 .read_header = read_header,
145 .read_packet = read_packet,