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
31typedef struct SMJPEGMuxContext {
32    uint32_t duration;
33} SMJPEGMuxContext;
34
35static 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    while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
50        avio_wl32(pb, SMJPEG_TXT);
51        avio_wb32(pb, strlen(t->key) + strlen(t->value) + 3);
52        avio_write(pb, t->key, strlen(t->key));
53        avio_write(pb, " = ", 3);
54        avio_write(pb, t->value, strlen(t->value));
55    }
56
57    for (n = 0; n < s->nb_streams; n++) {
58        AVStream *st = s->streams[n];
59        AVCodecContext *codec = st->codec;
60        if (codec->codec_type == AVMEDIA_TYPE_AUDIO) {
61            tag = ff_codec_get_tag(ff_codec_smjpeg_audio_tags, codec->codec_id);
62            if (!tag) {
63                av_log(s, AV_LOG_ERROR, "unsupported audio codec\n");
64                return AVERROR(EINVAL);
65            }
66            avio_wl32(pb, SMJPEG_SND);
67            avio_wb32(pb, 8);
68            avio_wb16(pb, codec->sample_rate);
69            avio_w8(pb, codec->bits_per_coded_sample);
70            avio_w8(pb, codec->channels);
71            avio_wl32(pb, tag);
72            avpriv_set_pts_info(st, 32, 1, 1000);
73        } else if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
74            tag = ff_codec_get_tag(ff_codec_smjpeg_video_tags, codec->codec_id);
75            if (!tag) {
76                av_log(s, AV_LOG_ERROR, "unsupported video codec\n");
77                return AVERROR(EINVAL);
78            }
79            avio_wl32(pb, SMJPEG_VID);
80            avio_wb32(pb, 12);
81            avio_wb32(pb, 0);
82            avio_wb16(pb, codec->width);
83            avio_wb16(pb, codec->height);
84            avio_wl32(pb, tag);
85            avpriv_set_pts_info(st, 32, 1, 1000);
86        }
87    }
88
89    avio_wl32(pb, SMJPEG_HEND);
90    avio_flush(pb);
91
92    return 0;
93}
94
95static 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    AVCodecContext *codec = st->codec;
101
102    if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
103        avio_wl32(pb, SMJPEG_SNDD);
104    else if (codec->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
117static 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) {
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
135AVOutputFormat 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