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1 | /* |
2 | * SMJPEG demuxer | |
3 | * Copyright (c) 2011 Paul B Mahol | |
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 | /** | |
23 | * @file | |
24 | * This is a demuxer for Loki SDL Motion JPEG files | |
25 | */ | |
26 | ||
27 | #include <inttypes.h> | |
28 | ||
29 | #include "avformat.h" | |
30 | #include "internal.h" | |
31 | #include "riff.h" | |
32 | #include "smjpeg.h" | |
33 | ||
34 | typedef struct SMJPEGContext { | |
35 | int audio_stream_index; | |
36 | int video_stream_index; | |
37 | } SMJPEGContext; | |
38 | ||
39 | static int smjpeg_probe(AVProbeData *p) | |
40 | { | |
41 | if (!memcmp(p->buf, SMJPEG_MAGIC, 8)) | |
42 | return AVPROBE_SCORE_MAX; | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static int smjpeg_read_header(AVFormatContext *s) | |
47 | { | |
48 | SMJPEGContext *sc = s->priv_data; | |
49 | AVStream *ast = NULL, *vst = NULL; | |
50 | AVIOContext *pb = s->pb; | |
51 | uint32_t version, htype, hlength, duration; | |
52 | char *comment; | |
53 | ||
54 | avio_skip(pb, 8); // magic | |
55 | version = avio_rb32(pb); | |
56 | if (version) | |
57 | avpriv_request_sample(s, "Unknown version %"PRIu32, version); | |
58 | ||
59 | duration = avio_rb32(pb); // in msec | |
60 | ||
61 | while (!avio_feof(pb)) { | |
62 | htype = avio_rl32(pb); | |
63 | switch (htype) { | |
64 | case SMJPEG_TXT: | |
65 | hlength = avio_rb32(pb); | |
66 | if (!hlength || hlength > 512) | |
67 | return AVERROR_INVALIDDATA; | |
68 | comment = av_malloc(hlength + 1); | |
69 | if (!comment) | |
70 | return AVERROR(ENOMEM); | |
71 | if (avio_read(pb, comment, hlength) != hlength) { | |
72 | av_freep(&comment); | |
73 | av_log(s, AV_LOG_ERROR, "error when reading comment\n"); | |
74 | return AVERROR_INVALIDDATA; | |
75 | } | |
76 | comment[hlength] = 0; | |
77 | av_dict_set(&s->metadata, "comment", comment, | |
78 | AV_DICT_DONT_STRDUP_VAL); | |
79 | break; | |
80 | case SMJPEG_SND: | |
81 | if (ast) { | |
82 | avpriv_request_sample(s, "Multiple audio streams"); | |
83 | return AVERROR_PATCHWELCOME; | |
84 | } | |
85 | hlength = avio_rb32(pb); | |
86 | if (hlength < 8) | |
87 | return AVERROR_INVALIDDATA; | |
88 | ast = avformat_new_stream(s, 0); | |
89 | if (!ast) | |
90 | return AVERROR(ENOMEM); | |
91 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
92 | ast->codec->sample_rate = avio_rb16(pb); | |
93 | ast->codec->bits_per_coded_sample = avio_r8(pb); | |
94 | ast->codec->channels = avio_r8(pb); | |
95 | ast->codec->codec_tag = avio_rl32(pb); | |
96 | ast->codec->codec_id = ff_codec_get_id(ff_codec_smjpeg_audio_tags, | |
97 | ast->codec->codec_tag); | |
98 | ast->duration = duration; | |
99 | sc->audio_stream_index = ast->index; | |
100 | avpriv_set_pts_info(ast, 32, 1, 1000); | |
101 | avio_skip(pb, hlength - 8); | |
102 | break; | |
103 | case SMJPEG_VID: | |
104 | if (vst) { | |
105 | avpriv_request_sample(s, "Multiple video streams"); | |
106 | return AVERROR_INVALIDDATA; | |
107 | } | |
108 | hlength = avio_rb32(pb); | |
109 | if (hlength < 12) | |
110 | return AVERROR_INVALIDDATA; | |
111 | vst = avformat_new_stream(s, 0); | |
112 | if (!vst) | |
113 | return AVERROR(ENOMEM); | |
114 | vst->nb_frames = avio_rb32(pb); | |
115 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
116 | vst->codec->width = avio_rb16(pb); | |
117 | vst->codec->height = avio_rb16(pb); | |
118 | vst->codec->codec_tag = avio_rl32(pb); | |
119 | vst->codec->codec_id = ff_codec_get_id(ff_codec_smjpeg_video_tags, | |
120 | vst->codec->codec_tag); | |
121 | vst->duration = duration; | |
122 | sc->video_stream_index = vst->index; | |
123 | avpriv_set_pts_info(vst, 32, 1, 1000); | |
124 | avio_skip(pb, hlength - 12); | |
125 | break; | |
126 | case SMJPEG_HEND: | |
127 | return 0; | |
128 | default: | |
129 | av_log(s, AV_LOG_ERROR, "unknown header %"PRIx32"\n", htype); | |
130 | return AVERROR_INVALIDDATA; | |
131 | } | |
132 | } | |
133 | ||
134 | return AVERROR_EOF; | |
135 | } | |
136 | ||
137 | static int smjpeg_read_packet(AVFormatContext *s, AVPacket *pkt) | |
138 | { | |
139 | SMJPEGContext *sc = s->priv_data; | |
140 | uint32_t dtype, size, timestamp; | |
141 | int64_t pos; | |
142 | int ret; | |
143 | ||
144 | if (avio_feof(s->pb)) | |
145 | return AVERROR_EOF; | |
146 | pos = avio_tell(s->pb); | |
147 | dtype = avio_rl32(s->pb); | |
148 | switch (dtype) { | |
149 | case SMJPEG_SNDD: | |
150 | timestamp = avio_rb32(s->pb); | |
151 | size = avio_rb32(s->pb); | |
152 | ret = av_get_packet(s->pb, pkt, size); | |
153 | pkt->stream_index = sc->audio_stream_index; | |
154 | pkt->pts = timestamp; | |
155 | pkt->pos = pos; | |
156 | break; | |
157 | case SMJPEG_VIDD: | |
158 | timestamp = avio_rb32(s->pb); | |
159 | size = avio_rb32(s->pb); | |
160 | ret = av_get_packet(s->pb, pkt, size); | |
161 | pkt->stream_index = sc->video_stream_index; | |
162 | pkt->pts = timestamp; | |
163 | pkt->pos = pos; | |
164 | break; | |
165 | case SMJPEG_DONE: | |
166 | ret = AVERROR_EOF; | |
167 | break; | |
168 | default: | |
169 | av_log(s, AV_LOG_ERROR, "unknown chunk %"PRIx32"\n", dtype); | |
170 | ret = AVERROR_INVALIDDATA; | |
171 | break; | |
172 | } | |
173 | return ret; | |
174 | } | |
175 | ||
176 | AVInputFormat ff_smjpeg_demuxer = { | |
177 | .name = "smjpeg", | |
178 | .long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"), | |
179 | .priv_data_size = sizeof(SMJPEGContext), | |
180 | .read_probe = smjpeg_probe, | |
181 | .read_header = smjpeg_read_header, | |
182 | .read_packet = smjpeg_read_packet, | |
183 | .extensions = "mjpg", | |
184 | .flags = AVFMT_GENERIC_INDEX, | |
185 | }; |