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- /*
- * 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 "pcm.h"
- #include "riff.h"
- #include "rso.h"
- static int rso_read_header(AVFormatContext *s, AVFormatParameters *ap)
- {
- AVIOContext *pb = s->pb;
- int id, rate, bps;
- unsigned int size;
- enum CodecID codec;
- AVStream *st;
- id = avio_rb16(pb);
- size = avio_rb16(pb);
- rate = avio_rb16(pb);
- avio_rb16(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 ff_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},
- };
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