blob: 9f90faf56b8463d202de802fb6723127c4131bdc
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 | |
33 | typedef 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 | |
42 | static 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->codecpar, 2)) |
58 | return AVERROR(ENOMEM); |
59 | |
60 | version = avio_r8(pb); |
61 | vst->codecpar->extradata[0] = avio_r8(pb); |
62 | vst->codecpar->extradata[1] = avio_r8(pb); |
63 | frames_count = avio_rl32(pb); |
64 | msecs_per_frame = avio_rl32(pb); |
65 | vst->codecpar->width = avio_rl16(pb); |
66 | vst->codecpar->height = avio_rl16(pb); |
67 | avio_r8(pb); |
68 | ast->codecpar->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->codecpar->sample_rate); |
84 | ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
85 | ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8; |
86 | ast->codecpar->channels = 1; |
87 | ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
88 | ast->codecpar->bits_per_coded_sample = 8; |
89 | ast->codecpar->bit_rate = ast->codecpar->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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
94 | vst->codecpar->codec_id = AV_CODEC_ID_MOTIONPIXELS; |
95 | |
96 | mvi->get_int = (vst->codecpar->width * vst->codecpar->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->codecpar->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 | |
112 | static 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 | |
139 | AVInputFormat 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 |