| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * SMJPEG demuxer | ||
| 3 | * Copyright (c) 2011 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 demuxer for Loki SDL Motion JPEG files | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include <inttypes.h> | ||
| 28 | |||
| 29 | #include "libavutil/mem.h" | ||
| 30 | #include "avformat.h" | ||
| 31 | #include "demux.h" | ||
| 32 | #include "internal.h" | ||
| 33 | #include "smjpeg.h" | ||
| 34 | |||
| 35 | typedef struct SMJPEGContext { | ||
| 36 | int audio_stream_index; | ||
| 37 | int video_stream_index; | ||
| 38 | } SMJPEGContext; | ||
| 39 | |||
| 40 | ✗ | static int smjpeg_probe(const AVProbeData *p) | |
| 41 | { | ||
| 42 | ✗ | if (!memcmp(p->buf, SMJPEG_MAGIC, 8)) | |
| 43 | ✗ | return AVPROBE_SCORE_MAX; | |
| 44 | ✗ | return 0; | |
| 45 | } | ||
| 46 | |||
| 47 | ✗ | static int smjpeg_read_header(AVFormatContext *s) | |
| 48 | { | ||
| 49 | ✗ | SMJPEGContext *sc = s->priv_data; | |
| 50 | ✗ | AVStream *ast = NULL, *vst = NULL; | |
| 51 | ✗ | AVIOContext *pb = s->pb; | |
| 52 | uint32_t version, htype, hlength, duration; | ||
| 53 | char *comment; | ||
| 54 | |||
| 55 | ✗ | sc->audio_stream_index = | |
| 56 | ✗ | sc->video_stream_index = -1; | |
| 57 | |||
| 58 | ✗ | avio_skip(pb, 8); // magic | |
| 59 | ✗ | version = avio_rb32(pb); | |
| 60 | ✗ | if (version) | |
| 61 | ✗ | avpriv_request_sample(s, "Unknown version %"PRIu32, version); | |
| 62 | |||
| 63 | ✗ | duration = avio_rb32(pb); // in msec | |
| 64 | |||
| 65 | ✗ | while (!avio_feof(pb)) { | |
| 66 | ✗ | htype = avio_rl32(pb); | |
| 67 | ✗ | switch (htype) { | |
| 68 | ✗ | case SMJPEG_TXT: | |
| 69 | ✗ | hlength = avio_rb32(pb); | |
| 70 | ✗ | if (!hlength || hlength > 512) | |
| 71 | ✗ | return AVERROR_INVALIDDATA; | |
| 72 | ✗ | comment = av_malloc(hlength + 1); | |
| 73 | ✗ | if (!comment) | |
| 74 | ✗ | return AVERROR(ENOMEM); | |
| 75 | ✗ | if (avio_read(pb, comment, hlength) != hlength) { | |
| 76 | ✗ | av_freep(&comment); | |
| 77 | ✗ | av_log(s, AV_LOG_ERROR, "error when reading comment\n"); | |
| 78 | ✗ | return AVERROR_INVALIDDATA; | |
| 79 | } | ||
| 80 | ✗ | comment[hlength] = 0; | |
| 81 | ✗ | av_dict_set(&s->metadata, "comment", comment, | |
| 82 | AV_DICT_DONT_STRDUP_VAL); | ||
| 83 | ✗ | break; | |
| 84 | ✗ | case SMJPEG_SND: | |
| 85 | ✗ | if (ast) { | |
| 86 | ✗ | avpriv_request_sample(s, "Multiple audio streams"); | |
| 87 | ✗ | return AVERROR_PATCHWELCOME; | |
| 88 | } | ||
| 89 | ✗ | hlength = avio_rb32(pb); | |
| 90 | ✗ | if (hlength < 8) | |
| 91 | ✗ | return AVERROR_INVALIDDATA; | |
| 92 | ✗ | ast = avformat_new_stream(s, 0); | |
| 93 | ✗ | if (!ast) | |
| 94 | ✗ | return AVERROR(ENOMEM); | |
| 95 | ✗ | ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 96 | ✗ | ast->codecpar->sample_rate = avio_rb16(pb); | |
| 97 | ✗ | ast->codecpar->bits_per_coded_sample = avio_r8(pb); | |
| 98 | ✗ | ast->codecpar->ch_layout.nb_channels = avio_r8(pb); | |
| 99 | ✗ | ast->codecpar->codec_tag = avio_rl32(pb); | |
| 100 | ✗ | ast->codecpar->codec_id = ff_codec_get_id(ff_codec_smjpeg_audio_tags, | |
| 101 | ✗ | ast->codecpar->codec_tag); | |
| 102 | ✗ | ast->duration = duration; | |
| 103 | ✗ | sc->audio_stream_index = ast->index; | |
| 104 | ✗ | avpriv_set_pts_info(ast, 32, 1, 1000); | |
| 105 | ✗ | avio_skip(pb, hlength - 8); | |
| 106 | ✗ | break; | |
| 107 | ✗ | case SMJPEG_VID: | |
| 108 | ✗ | if (vst) { | |
| 109 | ✗ | avpriv_request_sample(s, "Multiple video streams"); | |
| 110 | ✗ | return AVERROR_INVALIDDATA; | |
| 111 | } | ||
| 112 | ✗ | hlength = avio_rb32(pb); | |
| 113 | ✗ | if (hlength < 12) | |
| 114 | ✗ | return AVERROR_INVALIDDATA; | |
| 115 | ✗ | vst = avformat_new_stream(s, 0); | |
| 116 | ✗ | if (!vst) | |
| 117 | ✗ | return AVERROR(ENOMEM); | |
| 118 | ✗ | vst->nb_frames = avio_rb32(pb); | |
| 119 | ✗ | vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 120 | ✗ | vst->codecpar->width = avio_rb16(pb); | |
| 121 | ✗ | vst->codecpar->height = avio_rb16(pb); | |
| 122 | ✗ | vst->codecpar->codec_tag = avio_rl32(pb); | |
| 123 | ✗ | vst->codecpar->codec_id = ff_codec_get_id(ff_codec_smjpeg_video_tags, | |
| 124 | ✗ | vst->codecpar->codec_tag); | |
| 125 | ✗ | vst->duration = duration; | |
| 126 | ✗ | sc->video_stream_index = vst->index; | |
| 127 | ✗ | avpriv_set_pts_info(vst, 32, 1, 1000); | |
| 128 | ✗ | avio_skip(pb, hlength - 12); | |
| 129 | ✗ | break; | |
| 130 | ✗ | case SMJPEG_HEND: | |
| 131 | ✗ | return 0; | |
| 132 | ✗ | default: | |
| 133 | ✗ | av_log(s, AV_LOG_ERROR, "unknown header %"PRIx32"\n", htype); | |
| 134 | ✗ | return AVERROR_INVALIDDATA; | |
| 135 | } | ||
| 136 | } | ||
| 137 | |||
| 138 | ✗ | return AVERROR_EOF; | |
| 139 | } | ||
| 140 | |||
| 141 | ✗ | static int smjpeg_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 142 | { | ||
| 143 | ✗ | SMJPEGContext *sc = s->priv_data; | |
| 144 | uint32_t dtype, size, timestamp; | ||
| 145 | int64_t pos; | ||
| 146 | int ret; | ||
| 147 | |||
| 148 | ✗ | if (avio_feof(s->pb)) | |
| 149 | ✗ | return AVERROR_EOF; | |
| 150 | ✗ | pos = avio_tell(s->pb); | |
| 151 | ✗ | dtype = avio_rl32(s->pb); | |
| 152 | ✗ | switch (dtype) { | |
| 153 | ✗ | case SMJPEG_SNDD: | |
| 154 | ✗ | if (sc->audio_stream_index < 0) | |
| 155 | ✗ | return AVERROR_INVALIDDATA; | |
| 156 | ✗ | timestamp = avio_rb32(s->pb); | |
| 157 | ✗ | size = avio_rb32(s->pb); | |
| 158 | ✗ | ret = av_get_packet(s->pb, pkt, size); | |
| 159 | ✗ | pkt->stream_index = sc->audio_stream_index; | |
| 160 | ✗ | pkt->pts = timestamp; | |
| 161 | ✗ | pkt->pos = pos; | |
| 162 | ✗ | break; | |
| 163 | ✗ | case SMJPEG_VIDD: | |
| 164 | ✗ | if (sc->video_stream_index < 0) | |
| 165 | ✗ | return AVERROR_INVALIDDATA; | |
| 166 | ✗ | timestamp = avio_rb32(s->pb); | |
| 167 | ✗ | size = avio_rb32(s->pb); | |
| 168 | ✗ | ret = av_get_packet(s->pb, pkt, size); | |
| 169 | ✗ | pkt->stream_index = sc->video_stream_index; | |
| 170 | ✗ | pkt->pts = timestamp; | |
| 171 | ✗ | pkt->pos = pos; | |
| 172 | ✗ | break; | |
| 173 | ✗ | case SMJPEG_DONE: | |
| 174 | ✗ | ret = AVERROR_EOF; | |
| 175 | ✗ | break; | |
| 176 | ✗ | default: | |
| 177 | ✗ | av_log(s, AV_LOG_ERROR, "unknown chunk %"PRIx32"\n", dtype); | |
| 178 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 179 | ✗ | break; | |
| 180 | } | ||
| 181 | ✗ | return ret; | |
| 182 | } | ||
| 183 | |||
| 184 | const FFInputFormat ff_smjpeg_demuxer = { | ||
| 185 | .p.name = "smjpeg", | ||
| 186 | .p.long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"), | ||
| 187 | .p.extensions = "mjpg", | ||
| 188 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 189 | .priv_data_size = sizeof(SMJPEGContext), | ||
| 190 | .read_probe = smjpeg_probe, | ||
| 191 | .read_header = smjpeg_read_header, | ||
| 192 | .read_packet = smjpeg_read_packet, | ||
| 193 | }; | ||
| 194 |