1 /*
2 * SMJPEG muxer
3 * Copyright (c) 2012 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 muxer for Loki SDL Motion JPEG files
25 */
26
27 #include "avformat.h"
28 #include "internal.h"
29 #include "smjpeg.h"
30
31 typedef struct SMJPEGMuxContext {
32 uint32_t duration;
33 } SMJPEGMuxContext;
34
smjpeg_write_header(AVFormatContext * s)35 static int smjpeg_write_header(AVFormatContext *s)
36 {
37 AVDictionaryEntry *t = NULL;
38 AVIOContext *pb = s->pb;
39 int n, tag;
40
41 if (s->nb_streams > 2) {
42 av_log(s, AV_LOG_ERROR, "more than >2 streams are not supported\n");
43 return AVERROR(EINVAL);
44 }
45 avio_write(pb, SMJPEG_MAGIC, 8);
46 avio_wb32(pb, 0);
47 avio_wb32(pb, 0);
48
49 ff_standardize_creation_time(s);
50 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
51 avio_wl32(pb, SMJPEG_TXT);
52 avio_wb32(pb, strlen(t->key) + strlen(t->value) + 3);
53 avio_write(pb, t->key, strlen(t->key));
54 avio_write(pb, " = ", 3);
55 avio_write(pb, t->value, strlen(t->value));
56 }
57
58 for (n = 0; n < s->nb_streams; n++) {
59 AVStream *st = s->streams[n];
60 AVCodecParameters *par = st->codecpar;
61 if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
62 tag = ff_codec_get_tag(ff_codec_smjpeg_audio_tags, par->codec_id);
63 if (!tag) {
64 av_log(s, AV_LOG_ERROR, "unsupported audio codec\n");
65 return AVERROR(EINVAL);
66 }
67 avio_wl32(pb, SMJPEG_SND);
68 avio_wb32(pb, 8);
69 avio_wb16(pb, par->sample_rate);
70 avio_w8(pb, par->bits_per_coded_sample);
71 avio_w8(pb, par->channels);
72 avio_wl32(pb, tag);
73 avpriv_set_pts_info(st, 32, 1, 1000);
74 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
75 tag = ff_codec_get_tag(ff_codec_smjpeg_video_tags, par->codec_id);
76 if (!tag) {
77 av_log(s, AV_LOG_ERROR, "unsupported video codec\n");
78 return AVERROR(EINVAL);
79 }
80 avio_wl32(pb, SMJPEG_VID);
81 avio_wb32(pb, 12);
82 avio_wb32(pb, 0);
83 avio_wb16(pb, par->width);
84 avio_wb16(pb, par->height);
85 avio_wl32(pb, tag);
86 avpriv_set_pts_info(st, 32, 1, 1000);
87 }
88 }
89
90 avio_wl32(pb, SMJPEG_HEND);
91
92 return 0;
93 }
94
smjpeg_write_packet(AVFormatContext * s,AVPacket * pkt)95 static int smjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
96 {
97 SMJPEGMuxContext *smc = s->priv_data;
98 AVIOContext *pb = s->pb;
99 AVStream *st = s->streams[pkt->stream_index];
100 AVCodecParameters *par = st->codecpar;
101
102 if (par->codec_type == AVMEDIA_TYPE_AUDIO)
103 avio_wl32(pb, SMJPEG_SNDD);
104 else if (par->codec_type == AVMEDIA_TYPE_VIDEO)
105 avio_wl32(pb, SMJPEG_VIDD);
106 else
107 return 0;
108
109 avio_wb32(pb, pkt->pts);
110 avio_wb32(pb, pkt->size);
111 avio_write(pb, pkt->data, pkt->size);
112
113 smc->duration = FFMAX(smc->duration, pkt->pts + pkt->duration);
114 return 0;
115 }
116
smjpeg_write_trailer(AVFormatContext * s)117 static int smjpeg_write_trailer(AVFormatContext *s)
118 {
119 SMJPEGMuxContext *smc = s->priv_data;
120 AVIOContext *pb = s->pb;
121 int64_t currentpos;
122
123 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
124 currentpos = avio_tell(pb);
125 avio_seek(pb, 12, SEEK_SET);
126 avio_wb32(pb, smc->duration);
127 avio_seek(pb, currentpos, SEEK_SET);
128 }
129
130 avio_wl32(pb, SMJPEG_DONE);
131
132 return 0;
133 }
134
135 AVOutputFormat ff_smjpeg_muxer = {
136 .name = "smjpeg",
137 .long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
138 .priv_data_size = sizeof(SMJPEGMuxContext),
139 .audio_codec = AV_CODEC_ID_PCM_S16LE,
140 .video_codec = AV_CODEC_ID_MJPEG,
141 .write_header = smjpeg_write_header,
142 .write_packet = smjpeg_write_packet,
143 .write_trailer = smjpeg_write_trailer,
144 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
145 .codec_tag = (const AVCodecTag *const []){ ff_codec_smjpeg_video_tags, ff_codec_smjpeg_audio_tags, 0 },
146 };
147