--- /dev/null
+/*
+ * 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 "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, AVFormatParameters *ap)
+{
+ 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)
+ av_log_ask_for_sample(s, "unknown version %d\n", 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) {
+ av_log_ask_for_sample(s, "multiple audio streams not supported\n");
+ return AVERROR_INVALIDDATA;
+ }
+ 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) {
+ av_log_ask_for_sample(s, "multiple video streams not supported\n");
+ 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 %x\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, ret, size, timestamp;
+
+ if (s->pb->eof_reached)
+ return AVERROR_EOF;
+ 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;
+ 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;
+ break;
+ case SMJPEG_DONE:
+ ret = AVERROR_EOF;
+ break;
+ default:
+ av_log(s, AV_LOG_ERROR, "unknown chunk %x\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",
+};
projects / ffmpeg / blobdiff