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 "avformat.h"
23
24#define MVI_FRAC_BITS 10
25
26#define MVI_AUDIO_STREAM_INDEX 0
27#define MVI_VIDEO_STREAM_INDEX 1
28
29typedef struct MviDemuxContext {
30    unsigned int (*get_int)(ByteIOContext *);
31    uint32_t audio_data_size;
32    uint64_t audio_size_counter;
33    uint64_t audio_frame_size;
34    int audio_size_left;
35    int video_frame_size;
36} MviDemuxContext;
37
38static int read_header(AVFormatContext *s, AVFormatParameters *ap)
39{
40    MviDemuxContext *mvi = s->priv_data;
41    ByteIOContext *pb = s->pb;
42    AVStream *ast, *vst;
43    unsigned int version, frames_count, msecs_per_frame, player_version;
44
45    ast = av_new_stream(s, 0);
46    if (!ast)
47        return AVERROR(ENOMEM);
48
49    vst = av_new_stream(s, 0);
50    if (!vst)
51        return AVERROR(ENOMEM);
52
53    vst->codec->extradata_size = 2;
54    vst->codec->extradata = av_mallocz(2 + FF_INPUT_BUFFER_PADDING_SIZE);
55
56    version                  = get_byte(pb);
57    vst->codec->extradata[0] = get_byte(pb);
58    vst->codec->extradata[1] = get_byte(pb);
59    frames_count             = get_le32(pb);
60    msecs_per_frame          = get_le32(pb);
61    vst->codec->width        = get_le16(pb);
62    vst->codec->height       = get_le16(pb);
63    get_byte(pb);
64    ast->codec->sample_rate  = get_le16(pb);
65    mvi->audio_data_size     = get_le32(pb);
66    get_byte(pb);
67    player_version           = get_le32(pb);
68    get_le16(pb);
69    get_byte(pb);
70
71    if (frames_count == 0 || mvi->audio_data_size == 0)
72        return AVERROR_INVALIDDATA;
73
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;
77    }
78
79    av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
80    ast->codec->codec_type      = CODEC_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;
85
86    av_set_pts_info(vst, 64, msecs_per_frame, 1000000);
87    vst->codec->codec_type = CODEC_TYPE_VIDEO;
88    vst->codec->codec_id   = CODEC_ID_MOTIONPIXELS;
89    vst->codec->pix_fmt    = PIX_FMT_RGB555;
90
91    mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? get_le16 : get_le24;
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    ByteIOContext *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 mvi_demuxer = {
128    "mvi",
129    NULL_IF_CONFIG_SMALL("Motion Pixels MVI format"),
130    sizeof(MviDemuxContext),
131    NULL,
132    read_header,
133    read_packet,
134    .extensions = "mvi"
135};
136