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 #define MVI_FRAC_BITS 10
26 #define MVI_AUDIO_STREAM_INDEX 0
27 #define MVI_VIDEO_STREAM_INDEX 1
29 typedef 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
;
38 static int read_header(AVFormatContext
*s
, AVFormatParameters
*ap
)
40 MviDemuxContext
*mvi
= s
->priv_data
;
41 ByteIOContext
*pb
= s
->pb
;
43 unsigned int version
, frames_count
, msecs_per_frame
, player_version
;
45 ast
= av_new_stream(s
, 0);
47 return AVERROR(ENOMEM
);
49 vst
= av_new_stream(s
, 0);
51 return AVERROR(ENOMEM
);
53 vst
->codec
->extradata_size
= 2;
54 vst
->codec
->extradata
= av_mallocz(2 + FF_INPUT_BUFFER_PADDING_SIZE
);
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
);
64 ast
->codec
->sample_rate
= get_le16(pb
);
65 mvi
->audio_data_size
= get_le32(pb
);
67 player_version
= get_le32(pb
);
71 if (frames_count
== 0 || mvi
->audio_data_size
== 0)
72 return AVERROR_INVALIDDATA
;
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
;
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_sample
= 8;
84 ast
->codec
->bit_rate
= ast
->codec
->sample_rate
* 8;
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
;
91 mvi
->get_int
= (vst
->codec
->width
* vst
->codec
->height
< (1 << 16)) ? get_le16
: get_le24
;
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
;
100 static int read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
103 MviDemuxContext
*mvi
= s
->priv_data
;
104 ByteIOContext
*pb
= s
->pb
;
106 if (mvi
->video_frame_size
== 0) {
107 mvi
->video_frame_size
= (mvi
->get_int
)(pb
);
108 if (mvi
->audio_size_left
== 0)
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)
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
);
119 if ((ret
= av_get_packet(pb
, pkt
, mvi
->video_frame_size
)) < 0)
121 pkt
->stream_index
= MVI_VIDEO_STREAM_INDEX
;
122 mvi
->video_frame_size
= 0;
127 AVInputFormat mvi_demuxer
= {
129 NULL_IF_CONFIG_SMALL("Motion Pixels MVI format"),
130 sizeof(MviDemuxContext
),