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102 lines
3.0 KiB
102 lines
3.0 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, AVFormatParameters *ap) |
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{ |
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ByteIOContext *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 = get_be16(pb); |
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size = get_be16(pb); |
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rate = get_be16(pb); |
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get_be16(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 = av_new_stream(s, 0); |
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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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av_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->stream_index = 0; |
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/* note: we need to modify the packet size here to handle the last packet */ |
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pkt->size = ret; |
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return 0; |
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} |
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AVInputFormat 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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.priv_data_size = 0, |
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.read_probe = NULL, /* no magic value in this format */ |
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.read_header = rso_read_header, |
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.read_packet = rso_read_packet, |
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.read_close = NULL, |
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.read_seek = 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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