blob: 68a128647e374b868491a3d646f4aa3f7ef7ff1b
| 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 | |
| 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 | avio_flush(pb); |
| 92 | |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 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 | |
| 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 | 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 |