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