From 68b94f8bc3a54735c360c6e72a3698fed8aba10b Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Sat, 14 Jan 2012 16:47:07 +0000 Subject: avformat: split out common SMJPEG code This is a preparation for adding SMJPEG muxer. Signed-off-by: Kostya Shishkov --- libavformat/smjpegdec.c | 177 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 177 insertions(+) create mode 100644 libavformat/smjpegdec.c (limited to 'libavformat/smjpegdec.c') diff --git a/libavformat/smjpegdec.c b/libavformat/smjpegdec.c new file mode 100644 index 0000000000..d7ff9799ef --- /dev/null +++ b/libavformat/smjpegdec.c @@ -0,0 +1,177 @@ +/* + * 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", +}; -- cgit v1.2.3