From a41a5db797660b3a2d24ff3516ae2e07b0f55678 Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Fri, 1 Dec 2017 15:15:13 +0100 Subject: avformat: add NSP demuxer Signed-off-by: Paul B Mahol --- libavformat/nspdec.c | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 libavformat/nspdec.c (limited to 'libavformat/nspdec.c') diff --git a/libavformat/nspdec.c b/libavformat/nspdec.c new file mode 100644 index 0000000000..34c747b65e --- /dev/null +++ b/libavformat/nspdec.c @@ -0,0 +1,108 @@ +/* + * NSP demuxer + * Copyright (c) 2017 Paul B Mahol + * + * 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/avstring.h" +#include "libavutil/intreadwrite.h" +#include "avformat.h" +#include "internal.h" +#include "pcm.h" + +static int nsp_probe(AVProbeData *p) +{ + if (AV_RB32(p->buf) == AV_RB32("FORM") && + AV_RB32(p->buf + 4) == AV_RB32("DS16")) + return AVPROBE_SCORE_MAX; + return 0; +} + +static int nsp_read_header(AVFormatContext *s) +{ + int channels = 0, rate = 0; + uint32_t chunk, size; + AVStream *st; + int64_t pos; + + avio_skip(s->pb, 12); + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + while (!avio_feof(s->pb)) { + char value[1024]; + + chunk = avio_rb32(s->pb); + size = avio_rl32(s->pb); + pos = avio_tell(s->pb); + + switch (chunk) { + case MKBETAG('H', 'E', 'D', 'R'): + case MKBETAG('H', 'D', 'R', '8'): + if (size < 32) + return AVERROR_INVALIDDATA; + avio_skip(s->pb, 20); + rate = avio_rl32(s->pb); + avio_skip(s->pb, size - (avio_tell(s->pb) - pos)); + break; + case MKBETAG('N', 'O', 'T', 'E'): + avio_get_str(s->pb, size, value, sizeof(value)); + av_dict_set(&s->metadata, "Comment", value, 0); + avio_skip(s->pb, size & 1); + break; + case MKBETAG('S', 'D', 'A', 'B'): + channels = 2; + break; + case MKBETAG('S', 'D', '_', '2'): + case MKBETAG('S', 'D', '_', '3'): + case MKBETAG('S', 'D', '_', '4'): + case MKBETAG('S', 'D', '_', '5'): + case MKBETAG('S', 'D', '_', '6'): + case MKBETAG('S', 'D', '_', '7'): + case MKBETAG('S', 'D', '_', '8'): + av_log(s, AV_LOG_WARNING, "Unsupported chunk!\n"); + case MKBETAG('S', 'D', 'A', '_'): + case MKBETAG('S', 'D', '_', 'A'): + channels = 1; + break; + } + + if (channels) + break; + } + + st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; + st->codecpar->channels = channels; + st->codecpar->sample_rate = rate; + st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; + st->codecpar->block_align = 2 * channels; + + return 0; +} + +AVInputFormat ff_nsp_demuxer = { + .name = "nsp", + .long_name = NULL_IF_CONFIG_SMALL("Computerized Speech Lab NSP"), + .read_probe = nsp_probe, + .read_header = nsp_read_header, + .read_packet = ff_pcm_read_packet, + .read_seek = ff_pcm_read_seek, + .extensions = "nsp", + .flags = AVFMT_GENERIC_INDEX, +}; -- cgit v1.2.3