From e8723e242d59ae2e4a4ca86d4b8bf823a348e544 Mon Sep 17 00:00:00 2001 From: Rafaël Carré Date: Tue, 20 Jul 2010 14:13:24 +0000 Subject: Lego Mindstorms RSO muxer and demuxer. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Patch by Rafaël Carré, rafael d carre a gmail Originally committed as revision 24355 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/rsodec.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 libavformat/rsodec.c (limited to 'libavformat/rsodec.c') diff --git a/libavformat/rsodec.c b/libavformat/rsodec.c new file mode 100644 index 0000000000..fbcf918c7e --- /dev/null +++ b/libavformat/rsodec.c @@ -0,0 +1,102 @@ +/* + * RSO demuxer + * Copyright (c) 2001 Fabrice Bellard (original AU code) + * Copyright (c) 2010 Rafael Carre + * + * 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 + */ + +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "internal.h" +#include "raw.h" +#include "riff.h" +#include "rso.h" + +static int rso_read_header(AVFormatContext *s, AVFormatParameters *ap) +{ + ByteIOContext *pb = s->pb; + int id, rate, bps; + unsigned int size; + enum CodecID codec; + AVStream *st; + + id = get_be16(pb); + size = get_be16(pb); + rate = get_be16(pb); + get_be16(pb); /* play mode ? (0x0000 = don't loop) */ + + codec = ff_codec_get_id(ff_codec_rso_tags, id); + + if (codec == CODEC_ID_ADPCM_IMA_WAV) { + av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n"); + return AVERROR_PATCHWELCOME; + } + + bps = av_get_bits_per_sample(codec); + if (!bps) { + av_log_ask_for_sample(s, "could not determine bits per sample\n"); + return AVERROR_INVALIDDATA; + } + + /* now we are ready: build format streams */ + st = av_new_stream(s, 0); + if (!st) + return AVERROR(ENOMEM); + + st->duration = (size * 8) / bps; + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_tag = id; + st->codec->codec_id = codec; + st->codec->channels = 1; + st->codec->sample_rate = rate; + + av_set_pts_info(st, 64, 1, rate); + + return 0; +} + +#define BLOCK_SIZE 1024 /* in samples */ + +static int rso_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + int bps = av_get_bits_per_sample(s->streams[0]->codec->codec_id); + int ret = av_get_packet(s->pb, pkt, BLOCK_SIZE * bps >> 3); + + if (ret < 0) + return ret; + + pkt->stream_index = 0; + + /* note: we need to modify the packet size here to handle the last packet */ + pkt->size = ret; + + return 0; +} + +AVInputFormat rso_demuxer = { + .name = "rso", + .long_name = NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO format"), + .extensions = "rso", + .priv_data_size = 0, + .read_probe = NULL, /* no magic value in this format */ + .read_header = rso_read_header, + .read_packet = rso_read_packet, + .read_close = NULL, + .read_seek = pcm_read_seek, + .codec_tag = (const AVCodecTag* const []){ff_codec_rso_tags, 0}, +}; -- cgit v1.2.3