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 <inttypes.h>
23
24#include "libavutil/channel_layout.h"
25#include "avformat.h"
26#include "internal.h"
27
28#define MVI_FRAC_BITS 10
29
30#define MVI_AUDIO_STREAM_INDEX 0
31#define MVI_VIDEO_STREAM_INDEX 1
32
33typedef 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;
38    int audio_size_left;
39    int video_frame_size;
40} MviDemuxContext;
41
42static int read_header(AVFormatContext *s)
43{
44    MviDemuxContext *mvi = s->priv_data;
45    AVIOContext *pb = s->pb;
46    AVStream *ast, *vst;
47    unsigned int version, frames_count, msecs_per_frame, player_version;
48
49    ast = avformat_new_stream(s, NULL);
50    if (!ast)
51        return AVERROR(ENOMEM);
52
53    vst = avformat_new_stream(s, NULL);
54    if (!vst)
55        return AVERROR(ENOMEM);
56
57    if (ff_alloc_extradata(vst->codec, 2))
58        return AVERROR(ENOMEM);
59
60    version                  = avio_r8(pb);
61    vst->codec->extradata[0] = avio_r8(pb);
62    vst->codec->extradata[1] = avio_r8(pb);
63    frames_count             = avio_rl32(pb);
64    msecs_per_frame          = avio_rl32(pb);
65    vst->codec->width        = avio_rl16(pb);
66    vst->codec->height       = avio_rl16(pb);
67    avio_r8(pb);
68    ast->codec->sample_rate  = avio_rl16(pb);
69    mvi->audio_data_size     = avio_rl32(pb);
70    avio_r8(pb);
71    player_version           = avio_rl32(pb);
72    avio_rl16(pb);
73    avio_r8(pb);
74
75    if (frames_count == 0 || mvi->audio_data_size == 0)
76        return AVERROR_INVALIDDATA;
77
78    if (version != 7 || player_version > 213) {
79        av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
80        return AVERROR_INVALIDDATA;
81    }
82
83    avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
84    ast->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
85    ast->codec->codec_id        = AV_CODEC_ID_PCM_U8;
86    ast->codec->channels        = 1;
87    ast->codec->channel_layout  = AV_CH_LAYOUT_MONO;
88    ast->codec->bits_per_coded_sample = 8;
89    ast->codec->bit_rate        = ast->codec->sample_rate * 8;
90
91    avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000);
92    vst->avg_frame_rate    = av_inv_q(vst->time_base);
93    vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
94    vst->codec->codec_id   = AV_CODEC_ID_MOTIONPIXELS;
95
96    mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24;
97
98    mvi->audio_frame_size   = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
99    if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {
100        av_log(s, AV_LOG_ERROR,
101               "Invalid audio_data_size (%"PRIu32") or frames_count (%u)\n",
102               mvi->audio_data_size, frames_count);
103        return AVERROR_INVALIDDATA;
104    }
105
106    mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
107    mvi->audio_size_left    = mvi->audio_data_size;
108
109    return 0;
110}
111
112static int read_packet(AVFormatContext *s, AVPacket *pkt)
113{
114    int ret, count;
115    MviDemuxContext *mvi = s->priv_data;
116    AVIOContext *pb = s->pb;
117
118    if (mvi->video_frame_size == 0) {
119        mvi->video_frame_size = (mvi->get_int)(pb);
120        if (mvi->audio_size_left == 0)
121            return AVERROR(EIO);
122        count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
123        if (count > mvi->audio_size_left)
124            count = mvi->audio_size_left;
125        if ((ret = av_get_packet(pb, pkt, count)) < 0)
126            return ret;
127        pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
128        mvi->audio_size_left -= count;
129        mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
130    } else {
131        if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
132            return ret;
133        pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
134        mvi->video_frame_size = 0;
135    }
136    return 0;
137}
138
139AVInputFormat ff_mvi_demuxer = {
140    .name           = "mvi",
141    .long_name      = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"),
142    .priv_data_size = sizeof(MviDemuxContext),
143    .read_header    = read_header,
144    .read_packet    = read_packet,
145    .extensions     = "mvi",
146};
147