| /* |
| * 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(const 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, |
| }; |