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
22 #include "libavutil/channel_layout.h"
26 #define MVI_FRAC_BITS 10
28 #define MVI_AUDIO_STREAM_INDEX 0
29 #define MVI_VIDEO_STREAM_INDEX 1
31 typedef struct MviDemuxContext {
32 unsigned int (*get_int)(AVIOContext *);
33 uint32_t audio_data_size;
34 uint64_t audio_size_counter;
35 uint64_t audio_frame_size;
40 static int read_header(AVFormatContext *s)
42 MviDemuxContext *mvi = s->priv_data;
43 AVIOContext *pb = s->pb;
45 unsigned int version, frames_count, msecs_per_frame, player_version;
47 ast = avformat_new_stream(s, NULL);
49 return AVERROR(ENOMEM);
51 vst = avformat_new_stream(s, NULL);
53 return AVERROR(ENOMEM);
55 if (ff_alloc_extradata(vst->codec, 2))
56 return AVERROR(ENOMEM);
58 version = avio_r8(pb);
59 vst->codec->extradata[0] = avio_r8(pb);
60 vst->codec->extradata[1] = avio_r8(pb);
61 frames_count = avio_rl32(pb);
62 msecs_per_frame = avio_rl32(pb);
63 vst->codec->width = avio_rl16(pb);
64 vst->codec->height = avio_rl16(pb);
66 ast->codec->sample_rate = avio_rl16(pb);
67 mvi->audio_data_size = avio_rl32(pb);
69 player_version = avio_rl32(pb);
73 if (frames_count == 0 || mvi->audio_data_size == 0)
74 return AVERROR_INVALIDDATA;
76 if (version != 7 || player_version > 213) {
77 av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
78 return AVERROR_INVALIDDATA;
81 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
82 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
83 ast->codec->codec_id = AV_CODEC_ID_PCM_U8;
84 ast->codec->channels = 1;
85 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
86 ast->codec->bits_per_coded_sample = 8;
87 ast->codec->bit_rate = ast->codec->sample_rate * 8;
89 avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000);
90 vst->avg_frame_rate = av_inv_q(vst->time_base);
91 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
92 vst->codec->codec_id = AV_CODEC_ID_MOTIONPIXELS;
94 mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24;
96 mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
97 if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {
98 av_log(s, AV_LOG_ERROR, "Invalid audio_data_size (%d) or frames_count (%d)\n",
99 mvi->audio_data_size, frames_count);
100 return AVERROR_INVALIDDATA;
103 mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
104 mvi->audio_size_left = mvi->audio_data_size;
109 static int read_packet(AVFormatContext *s, AVPacket *pkt)
112 MviDemuxContext *mvi = s->priv_data;
113 AVIOContext *pb = s->pb;
115 if (mvi->video_frame_size == 0) {
116 mvi->video_frame_size = (mvi->get_int)(pb);
117 if (mvi->audio_size_left == 0)
119 count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
120 if (count > mvi->audio_size_left)
121 count = mvi->audio_size_left;
122 if ((ret = av_get_packet(pb, pkt, count)) < 0)
124 pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
125 mvi->audio_size_left -= count;
126 mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
128 if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
130 pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
131 mvi->video_frame_size = 0;
136 AVInputFormat ff_mvi_demuxer = {
138 .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"),
139 .priv_data_size = sizeof(MviDemuxContext),
140 .read_header = read_header,
141 .read_packet = read_packet,