diff options
author | Paul B Mahol <onemda@gmail.com> | 2011-12-19 04:16:11 +0400 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2011-12-22 07:12:45 +0400 |
commit | a4209ad6313b8b40fed2bfc7e3865cf54d4c1022 (patch) | |
tree | 193dd9cb422e681e96aba79ddda4a8e1421f3b37 /libavformat/smjpeg.c | |
parent | 9eae8396f1f6391b719f26ef8e4711ef3ea1cbb2 (diff) |
lavf: Add SMJPEG demuxer.
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavformat/smjpeg.c')
-rw-r--r-- | libavformat/smjpeg.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/libavformat/smjpeg.c b/libavformat/smjpeg.c new file mode 100644 index 0000000000..86cdc46570 --- /dev/null +++ b/libavformat/smjpeg.c @@ -0,0 +1,183 @@ +/* + * SMJPEG demuxer + * Copyright (c) 2011 Paul B Mahol + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; 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 MJPEG files + */ + +#include "avformat.h" +#include "internal.h" +#include "riff.h" + +static const AVCodecTag codec_smjpeg_tags[] = { + { CODEC_ID_ADPCM_IMA_SMJPEG, MKTAG('A', 'P', 'C', 'M') }, + { CODEC_ID_PCM_S16LE, MKTAG('N', 'O', 'N', 'E') }, + { CODEC_ID_MJPEG, MKTAG('J', 'F', 'I', 'F') }, + { CODEC_ID_NONE, 0 }, +}; + +typedef struct SMJPEGContext { + int audio_stream_index; + int video_stream_index; +} SMJPEGContext; + +static int smjpeg_probe(AVProbeData *p) +{ + if (!memcmp(p->buf, "\x0\xaSMJPEG", 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 MKTAG('_', 'T', 'X', 'T'): + 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 MKTAG('_', 'S', 'N', 'D'): + 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(codec_smjpeg_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 MKTAG('_', 'V', 'I', 'D'): + 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(codec_smjpeg_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 MKTAG('H', 'E', 'N', 'D'): + 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 MKTAG('s', 'n', 'd', 'D'): + 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 MKTAG('v', 'i', 'd', 'D'): + 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 MKTAG('D', 'O', 'N', 'E'): + 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", +}; |