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2ba45a60 DM |
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->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 | ||
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 | }; |