blob: c184c0d9fdc04e5cbc0dfb3df6b313125908c17d
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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
92 | ast->codecpar->sample_rate = avio_rb16(pb); |
93 | ast->codecpar->bits_per_coded_sample = avio_r8(pb); |
94 | ast->codecpar->channels = avio_r8(pb); |
95 | ast->codecpar->codec_tag = avio_rl32(pb); |
96 | ast->codecpar->codec_id = ff_codec_get_id(ff_codec_smjpeg_audio_tags, |
97 | ast->codecpar->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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
116 | vst->codecpar->width = avio_rb16(pb); |
117 | vst->codecpar->height = avio_rb16(pb); |
118 | vst->codecpar->codec_tag = avio_rl32(pb); |
119 | vst->codecpar->codec_id = ff_codec_get_id(ff_codec_smjpeg_video_tags, |
120 | vst->codecpar->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 | }; |
186 |