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 "mux.h"
30 #include "smjpeg.h"
31
32 typedef struct SMJPEGMuxContext {
33 uint32_t duration;
34 } SMJPEGMuxContext;
35
smjpeg_write_header(AVFormatContext * s)36 static int smjpeg_write_header(AVFormatContext *s)
37 {
38 AVDictionaryEntry *t = NULL;
39 AVIOContext *pb = s->pb;
40 int n, tag;
41
42 if (s->nb_streams > 2) {
43 av_log(s, AV_LOG_ERROR, "more than >2 streams are not supported\n");
44 return AVERROR(EINVAL);
45 }
46 avio_write(pb, SMJPEG_MAGIC, 8);
47 avio_wb32(pb, 0);
48 avio_wb32(pb, 0);
49
50 ff_standardize_creation_time(s);
51 while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
52 avio_wl32(pb, SMJPEG_TXT);
53 avio_wb32(pb, strlen(t->key) + strlen(t->value) + 3);
54 avio_write(pb, t->key, strlen(t->key));
55 avio_write(pb, " = ", 3);
56 avio_write(pb, t->value, strlen(t->value));
57 }
58
59 for (n = 0; n < s->nb_streams; n++) {
60 AVStream *st = s->streams[n];
61 AVCodecParameters *par = st->codecpar;
62 if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
63 tag = ff_codec_get_tag(ff_codec_smjpeg_audio_tags, par->codec_id);
64 if (!tag) {
65 av_log(s, AV_LOG_ERROR, "unsupported audio codec\n");
66 return AVERROR(EINVAL);
67 }
68 avio_wl32(pb, SMJPEG_SND);
69 avio_wb32(pb, 8);
70 avio_wb16(pb, par->sample_rate);
71 avio_w8(pb, par->bits_per_coded_sample);
72 avio_w8(pb, par->ch_layout.nb_channels);
73 avio_wl32(pb, tag);
74 avpriv_set_pts_info(st, 32, 1, 1000);
75 } else if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
76 tag = ff_codec_get_tag(ff_codec_smjpeg_video_tags, par->codec_id);
77 if (!tag) {
78 av_log(s, AV_LOG_ERROR, "unsupported video codec\n");
79 return AVERROR(EINVAL);
80 }
81 avio_wl32(pb, SMJPEG_VID);
82 avio_wb32(pb, 12);
83 avio_wb32(pb, 0);
84 avio_wb16(pb, par->width);
85 avio_wb16(pb, par->height);
86 avio_wl32(pb, tag);
87 avpriv_set_pts_info(st, 32, 1, 1000);
88 }
89 }
90
91 avio_wl32(pb, SMJPEG_HEND);
92
93 return 0;
94 }
95
smjpeg_write_packet(AVFormatContext * s,AVPacket * pkt)96 static int smjpeg_write_packet(AVFormatContext *s, AVPacket *pkt)
97 {
98 SMJPEGMuxContext *smc = s->priv_data;
99 AVIOContext *pb = s->pb;
100 AVStream *st = s->streams[pkt->stream_index];
101 AVCodecParameters *par = st->codecpar;
102
103 if (par->codec_type == AVMEDIA_TYPE_AUDIO)
104 avio_wl32(pb, SMJPEG_SNDD);
105 else if (par->codec_type == AVMEDIA_TYPE_VIDEO)
106 avio_wl32(pb, SMJPEG_VIDD);
107 else
108 return 0;
109
110 avio_wb32(pb, pkt->pts);
111 avio_wb32(pb, pkt->size);
112 avio_write(pb, pkt->data, pkt->size);
113
114 smc->duration = FFMAX(smc->duration, pkt->pts + pkt->duration);
115 return 0;
116 }
117
smjpeg_write_trailer(AVFormatContext * s)118 static int smjpeg_write_trailer(AVFormatContext *s)
119 {
120 SMJPEGMuxContext *smc = s->priv_data;
121 AVIOContext *pb = s->pb;
122 int64_t currentpos;
123
124 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
125 currentpos = avio_tell(pb);
126 avio_seek(pb, 12, SEEK_SET);
127 avio_wb32(pb, smc->duration);
128 avio_seek(pb, currentpos, SEEK_SET);
129 }
130
131 avio_wl32(pb, SMJPEG_DONE);
132
133 return 0;
134 }
135
136 const AVOutputFormat ff_smjpeg_muxer = {
137 .name = "smjpeg",
138 .long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
139 .priv_data_size = sizeof(SMJPEGMuxContext),
140 .audio_codec = AV_CODEC_ID_PCM_S16LE,
141 .video_codec = AV_CODEC_ID_MJPEG,
142 .write_header = smjpeg_write_header,
143 .write_packet = smjpeg_write_packet,
144 .write_trailer = smjpeg_write_trailer,
145 .flags = AVFMT_GLOBALHEADER | AVFMT_TS_NONSTRICT,
146 .codec_tag = (const AVCodecTag *const []){ ff_codec_smjpeg_video_tags, ff_codec_smjpeg_audio_tags, 0 },
147 };
148