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aiffdec: use av_get_audio_frame_duration() to set block_duration for AIFF-C
[ffmpeg] / libavformat / smjpegdec.c
1 /*
2  * SMJPEG demuxer
3  * Copyright (c) 2011 Paul B Mahol
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 "avformat.h"
28 #include "internal.h"
29 #include "riff.h"
30 #include "smjpeg.h"
31
32 typedef struct SMJPEGContext {
33     int audio_stream_index;
34     int video_stream_index;
35 } SMJPEGContext;
36
37 static int smjpeg_probe(AVProbeData *p)
38 {
39     if (!memcmp(p->buf, SMJPEG_MAGIC, 8))
40         return AVPROBE_SCORE_MAX;
41     return 0;
42 }
43
44 static int smjpeg_read_header(AVFormatContext *s)
45 {
46     SMJPEGContext *sc = s->priv_data;
47     AVStream *ast = NULL, *vst = NULL;
48     AVIOContext *pb = s->pb;
49     uint32_t version, htype, hlength, duration;
50     char *comment;
51
52     avio_skip(pb, 8); // magic
53     version = avio_rb32(pb);
54     if (version)
55         av_log_ask_for_sample(s, "unknown version %d\n", version);
56
57     duration = avio_rb32(pb); // in msec
58
59     while (!pb->eof_reached) {
60         htype = avio_rl32(pb);
61         switch (htype) {
62         case SMJPEG_TXT:
63             hlength = avio_rb32(pb);
64             if (!hlength || hlength > 512)
65                 return AVERROR_INVALIDDATA;
66             comment = av_malloc(hlength + 1);
67             if (!comment)
68                 return AVERROR(ENOMEM);
69             if (avio_read(pb, comment, hlength) != hlength) {
70                 av_freep(&comment);
71                 av_log(s, AV_LOG_ERROR, "error when reading comment\n");
72                 return AVERROR_INVALIDDATA;
73             }
74             comment[hlength] = 0;
75             av_dict_set(&s->metadata, "comment", comment,
76                         AV_DICT_DONT_STRDUP_VAL);
77             break;
78         case SMJPEG_SND:
79             if (ast) {
80                 av_log_ask_for_sample(s, "multiple audio streams not supported\n");
81                 return AVERROR_INVALIDDATA;
82             }
83             hlength = avio_rb32(pb);
84             if (hlength < 8)
85                 return AVERROR_INVALIDDATA;
86             ast = avformat_new_stream(s, 0);
87             if (!ast)
88                 return AVERROR(ENOMEM);
89             ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
90             ast->codec->sample_rate = avio_rb16(pb);
91             ast->codec->bits_per_coded_sample = avio_r8(pb);
92             ast->codec->channels    = avio_r8(pb);
93             ast->codec->codec_tag   = avio_rl32(pb);
94             ast->codec->codec_id    = ff_codec_get_id(ff_codec_smjpeg_audio_tags,
95                                                       ast->codec->codec_tag);
96             ast->duration           = duration;
97             sc->audio_stream_index  = ast->index;
98             avpriv_set_pts_info(ast, 32, 1, 1000);
99             avio_skip(pb, hlength - 8);
100             break;
101         case SMJPEG_VID:
102             if (vst) {
103                 av_log_ask_for_sample(s, "multiple video streams not supported\n");
104                 return AVERROR_INVALIDDATA;
105             }
106             hlength = avio_rb32(pb);
107             if (hlength < 12)
108                 return AVERROR_INVALIDDATA;
109             avio_skip(pb, 4); // number of frames
110             vst = avformat_new_stream(s, 0);
111             if (!vst)
112                 return AVERROR(ENOMEM);
113             vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
114             vst->codec->width      = avio_rb16(pb);
115             vst->codec->height     = avio_rb16(pb);
116             vst->codec->codec_tag  = avio_rl32(pb);
117             vst->codec->codec_id   = ff_codec_get_id(ff_codec_smjpeg_video_tags,
118                                                      vst->codec->codec_tag);
119             vst->duration          = duration;
120             sc->video_stream_index = vst->index;
121             avpriv_set_pts_info(vst, 32, 1, 1000);
122             avio_skip(pb, hlength - 12);
123             break;
124         case SMJPEG_HEND:
125             return 0;
126         default:
127             av_log(s, AV_LOG_ERROR, "unknown header %x\n", htype);
128             return AVERROR_INVALIDDATA;
129         }
130     }
131
132     return AVERROR_EOF;
133 }
134
135 static int smjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
136 {
137     SMJPEGContext *sc = s->priv_data;
138     uint32_t dtype, ret, size, timestamp;
139     int64_t pos;
140
141     if (s->pb->eof_reached)
142         return AVERROR_EOF;
143     pos   = avio_tell(s->pb);
144     dtype = avio_rl32(s->pb);
145     switch (dtype) {
146     case SMJPEG_SNDD:
147         timestamp = avio_rb32(s->pb);
148         size = avio_rb32(s->pb);
149         ret = av_get_packet(s->pb, pkt, size);
150         pkt->stream_index = sc->audio_stream_index;
151         pkt->pts = timestamp;
152         pkt->pos = pos;
153         break;
154     case SMJPEG_VIDD:
155         timestamp = avio_rb32(s->pb);
156         size = avio_rb32(s->pb);
157         ret = av_get_packet(s->pb, pkt, size);
158         pkt->stream_index = sc->video_stream_index;
159         pkt->pts = timestamp;
160         pkt->pos = pos;
161         break;
162     case SMJPEG_DONE:
163         ret = AVERROR_EOF;
164         break;
165     default:
166         av_log(s, AV_LOG_ERROR, "unknown chunk %x\n", dtype);
167         ret = AVERROR_INVALIDDATA;
168         break;
169     }
170     return ret;
171 }
172
173 AVInputFormat ff_smjpeg_demuxer = {
174     .name           = "smjpeg",
175     .long_name      = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
176     .priv_data_size = sizeof(SMJPEGContext),
177     .read_probe     = smjpeg_probe,
178     .read_header    = smjpeg_read_header,
179     .read_packet    = smjpeg_read_packet,
180     .extensions     = "mjpg",
181     .flags          = AVFMT_GENERIC_INDEX,
182 };