mirror of
https://github.com/FFmpeg/FFmpeg.git
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109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/*
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* NSP demuxer
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* Copyright (c) 2017 Paul B Mahol
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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/avstring.h"
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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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static int nsp_probe(AVProbeData *p)
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{
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if (AV_RB32(p->buf) == AV_RB32("FORM") &&
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AV_RB32(p->buf + 4) == AV_RB32("DS16"))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int nsp_read_header(AVFormatContext *s)
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{
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int channels = 0, rate = 0;
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uint32_t chunk, size;
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AVStream *st;
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int64_t pos;
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avio_skip(s->pb, 12);
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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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while (!avio_feof(s->pb)) {
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char value[1024];
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chunk = avio_rb32(s->pb);
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size = avio_rl32(s->pb);
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pos = avio_tell(s->pb);
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switch (chunk) {
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case MKBETAG('H', 'E', 'D', 'R'):
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case MKBETAG('H', 'D', 'R', '8'):
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if (size < 32)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 20);
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rate = avio_rl32(s->pb);
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avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
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break;
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case MKBETAG('N', 'O', 'T', 'E'):
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avio_get_str(s->pb, size, value, sizeof(value));
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av_dict_set(&s->metadata, "Comment", value, 0);
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avio_skip(s->pb, size & 1);
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break;
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case MKBETAG('S', 'D', 'A', 'B'):
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channels = 2;
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break;
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case MKBETAG('S', 'D', '_', '2'):
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case MKBETAG('S', 'D', '_', '3'):
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case MKBETAG('S', 'D', '_', '4'):
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case MKBETAG('S', 'D', '_', '5'):
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case MKBETAG('S', 'D', '_', '6'):
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case MKBETAG('S', 'D', '_', '7'):
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case MKBETAG('S', 'D', '_', '8'):
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av_log(s, AV_LOG_WARNING, "Unsupported chunk!\n");
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case MKBETAG('S', 'D', 'A', '_'):
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case MKBETAG('S', 'D', '_', 'A'):
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channels = 1;
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break;
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}
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if (channels)
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break;
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}
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->channels = channels;
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st->codecpar->sample_rate = rate;
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st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
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st->codecpar->block_align = 2 * channels;
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return 0;
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}
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AVInputFormat ff_nsp_demuxer = {
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.name = "nsp",
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.long_name = NULL_IF_CONFIG_SMALL("Computerized Speech Lab NSP"),
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.read_probe = nsp_probe,
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.read_header = nsp_read_header,
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.read_packet = ff_pcm_read_packet,
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.read_seek = ff_pcm_read_seek,
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.extensions = "nsp",
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.flags = AVFMT_GENERIC_INDEX,
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};
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