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97 lines
2.8 KiB
97 lines
2.8 KiB
/* |
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* RSO demuxer |
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* Copyright (c) 2001 Fabrice Bellard (original AU code) |
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* Copyright (c) 2010 Rafael Carre |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "pcm.h" |
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#include "riff.h" |
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#include "rso.h" |
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static int rso_read_header(AVFormatContext *s) |
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{ |
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AVIOContext *pb = s->pb; |
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int id, rate, bps; |
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unsigned int size; |
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enum CodecID codec; |
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AVStream *st; |
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id = avio_rb16(pb); |
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size = avio_rb16(pb); |
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rate = avio_rb16(pb); |
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avio_rb16(pb); /* play mode ? (0x0000 = don't loop) */ |
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codec = ff_codec_get_id(ff_codec_rso_tags, id); |
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if (codec == CODEC_ID_ADPCM_IMA_WAV) { |
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av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n"); |
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return AVERROR_PATCHWELCOME; |
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} |
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bps = av_get_bits_per_sample(codec); |
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if (!bps) { |
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av_log_ask_for_sample(s, "could not determine bits per sample\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* now we are ready: build format streams */ |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->duration = (size * 8) / bps; |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_tag = id; |
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st->codec->codec_id = codec; |
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st->codec->channels = 1; |
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st->codec->sample_rate = rate; |
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avpriv_set_pts_info(st, 64, 1, rate); |
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return 0; |
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} |
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#define BLOCK_SIZE 1024 /* in samples */ |
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static int rso_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int bps = av_get_bits_per_sample(s->streams[0]->codec->codec_id); |
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int ret = av_get_packet(s->pb, pkt, BLOCK_SIZE * bps >> 3); |
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if (ret < 0) |
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return ret; |
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT; |
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pkt->stream_index = 0; |
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return 0; |
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} |
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AVInputFormat ff_rso_demuxer = { |
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.name = "rso", |
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.long_name = NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO format"), |
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.extensions = "rso", |
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.read_header = rso_read_header, |
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.read_packet = rso_read_packet, |
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.read_seek = ff_pcm_read_seek, |
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.codec_tag = (const AVCodecTag* const []){ff_codec_rso_tags, 0}, |
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};
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