/* * SMJPEG demuxer * Copyright (c) 2011 Paul B Mahol * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * This is a demuxer for Loki SDL Motion JPEG files */ #include <inttypes.h> #include "avformat.h" #include "internal.h" #include "riff.h" #include "smjpeg.h" typedef struct SMJPEGContext { int audio_stream_index; int video_stream_index; } SMJPEGContext; static int smjpeg_probe(AVProbeData *p) { if (!memcmp(p->buf, SMJPEG_MAGIC, 8)) return AVPROBE_SCORE_MAX; return 0; } static int smjpeg_read_header(AVFormatContext *s) { SMJPEGContext *sc = s->priv_data; AVStream *ast = NULL, *vst = NULL; AVIOContext *pb = s->pb; uint32_t version, htype, hlength, duration; char *comment; avio_skip(pb, 8); // magic version = avio_rb32(pb); if (version) avpriv_request_sample(s, "Unknown version %"PRIu32, version); duration = avio_rb32(pb); // in msec while (!pb->eof_reached) { htype = avio_rl32(pb); switch (htype) { case SMJPEG_TXT: hlength = avio_rb32(pb); if (!hlength || hlength > 512) return AVERROR_INVALIDDATA; comment = av_malloc(hlength + 1); if (!comment) return AVERROR(ENOMEM); if (avio_read(pb, comment, hlength) != hlength) { av_freep(&comment); av_log(s, AV_LOG_ERROR, "error when reading comment\n"); return AVERROR_INVALIDDATA; } comment[hlength] = 0; av_dict_set(&s->metadata, "comment", comment, AV_DICT_DONT_STRDUP_VAL); break; case SMJPEG_SND: if (ast) { avpriv_request_sample(s, "Multiple audio streams"); return AVERROR_PATCHWELCOME; } hlength = avio_rb32(pb); if (hlength < 8) return AVERROR_INVALIDDATA; ast = avformat_new_stream(s, 0); if (!ast) return AVERROR(ENOMEM); ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; ast->codec->sample_rate = avio_rb16(pb); ast->codec->bits_per_coded_sample = avio_r8(pb); ast->codec->channels = avio_r8(pb); ast->codec->codec_tag = avio_rl32(pb); ast->codec->codec_id = ff_codec_get_id(ff_codec_smjpeg_audio_tags, ast->codec->codec_tag); ast->duration = duration; sc->audio_stream_index = ast->index; avpriv_set_pts_info(ast, 32, 1, 1000); avio_skip(pb, hlength - 8); break; case SMJPEG_VID: if (vst) { avpriv_request_sample(s, "Multiple video streams"); return AVERROR_INVALIDDATA; } hlength = avio_rb32(pb); if (hlength < 12) return AVERROR_INVALIDDATA; avio_skip(pb, 4); // number of frames vst = avformat_new_stream(s, 0); if (!vst) return AVERROR(ENOMEM); vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; vst->codec->width = avio_rb16(pb); vst->codec->height = avio_rb16(pb); vst->codec->codec_tag = avio_rl32(pb); vst->codec->codec_id = ff_codec_get_id(ff_codec_smjpeg_video_tags, vst->codec->codec_tag); vst->duration = duration; sc->video_stream_index = vst->index; avpriv_set_pts_info(vst, 32, 1, 1000); avio_skip(pb, hlength - 12); break; case SMJPEG_HEND: return 0; default: av_log(s, AV_LOG_ERROR, "unknown header %"PRIx32"\n", htype); return AVERROR_INVALIDDATA; } } return AVERROR_EOF; } static int smjpeg_read_packet(AVFormatContext *s, AVPacket *pkt) { SMJPEGContext *sc = s->priv_data; uint32_t dtype, size, timestamp; int64_t pos; int ret; if (s->pb->eof_reached) return AVERROR_EOF; pos = avio_tell(s->pb); dtype = avio_rl32(s->pb); switch (dtype) { case SMJPEG_SNDD: timestamp = avio_rb32(s->pb); size = avio_rb32(s->pb); ret = av_get_packet(s->pb, pkt, size); pkt->stream_index = sc->audio_stream_index; pkt->pts = timestamp; pkt->pos = pos; break; case SMJPEG_VIDD: timestamp = avio_rb32(s->pb); size = avio_rb32(s->pb); ret = av_get_packet(s->pb, pkt, size); pkt->stream_index = sc->video_stream_index; pkt->pts = timestamp; pkt->pos = pos; break; case SMJPEG_DONE: ret = AVERROR_EOF; break; default: av_log(s, AV_LOG_ERROR, "unknown chunk %"PRIx32"\n", dtype); ret = AVERROR_INVALIDDATA; break; } return ret; } AVInputFormat ff_smjpeg_demuxer = { .name = "smjpeg", .long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"), .priv_data_size = sizeof(SMJPEGContext), .read_probe = smjpeg_probe, .read_header = smjpeg_read_header, .read_packet = smjpeg_read_packet, .extensions = "mjpg", .flags = AVFMT_GENERIC_INDEX, };