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
32typedef struct SMJPEGMuxContext {
33    uint32_t duration;
34} SMJPEGMuxContext;
35
36static 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
96static 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
118static 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
136const 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