| /* |
| * 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}, |
| }; |