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