| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * NSP demuxer | ||
| 3 | * Copyright (c) 2017 Paul B Mahol | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/avstring.h" | ||
| 23 | #include "libavutil/intreadwrite.h" | ||
| 24 | #include "avformat.h" | ||
| 25 | #include "demux.h" | ||
| 26 | #include "internal.h" | ||
| 27 | #include "pcm.h" | ||
| 28 | |||
| 29 | 7186 | static int nsp_probe(const AVProbeData *p) | |
| 30 | { | ||
| 31 |
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7186 | if (AV_RB32(p->buf) == AV_RB32("FORM") && |
| 32 |
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21 | AV_RB32(p->buf + 4) == AV_RB32("DS16")) |
| 33 | ✗ | return AVPROBE_SCORE_MAX; | |
| 34 | 7186 | return 0; | |
| 35 | } | ||
| 36 | |||
| 37 | ✗ | static int nsp_read_header(AVFormatContext *s) | |
| 38 | { | ||
| 39 | ✗ | int channels = 0, rate = 0; | |
| 40 | uint32_t chunk, size; | ||
| 41 | AVStream *st; | ||
| 42 | int64_t pos; | ||
| 43 | |||
| 44 | ✗ | avio_skip(s->pb, 12); | |
| 45 | ✗ | st = avformat_new_stream(s, NULL); | |
| 46 | ✗ | if (!st) | |
| 47 | ✗ | return AVERROR(ENOMEM); | |
| 48 | |||
| 49 | ✗ | while (!avio_feof(s->pb)) { | |
| 50 | char value[1024]; | ||
| 51 | |||
| 52 | ✗ | chunk = avio_rb32(s->pb); | |
| 53 | ✗ | size = avio_rl32(s->pb); | |
| 54 | ✗ | pos = avio_tell(s->pb); | |
| 55 | |||
| 56 | ✗ | switch (chunk) { | |
| 57 | ✗ | case MKBETAG('H', 'E', 'D', 'R'): | |
| 58 | case MKBETAG('H', 'D', 'R', '8'): | ||
| 59 | ✗ | if (size < 32) | |
| 60 | ✗ | return AVERROR_INVALIDDATA; | |
| 61 | ✗ | avio_skip(s->pb, 20); | |
| 62 | ✗ | rate = avio_rl32(s->pb); | |
| 63 | ✗ | avio_skip(s->pb, size - (avio_tell(s->pb) - pos)); | |
| 64 | ✗ | break; | |
| 65 | ✗ | case MKBETAG('N', 'O', 'T', 'E'): | |
| 66 | ✗ | avio_get_str(s->pb, size, value, sizeof(value)); | |
| 67 | ✗ | av_dict_set(&s->metadata, "Comment", value, 0); | |
| 68 | ✗ | avio_skip(s->pb, size & 1); | |
| 69 | ✗ | break; | |
| 70 | ✗ | case MKBETAG('S', 'D', 'A', 'B'): | |
| 71 | ✗ | channels = 2; | |
| 72 | ✗ | break; | |
| 73 | ✗ | case MKBETAG('S', 'D', '_', '2'): | |
| 74 | case MKBETAG('S', 'D', '_', '3'): | ||
| 75 | case MKBETAG('S', 'D', '_', '4'): | ||
| 76 | case MKBETAG('S', 'D', '_', '5'): | ||
| 77 | case MKBETAG('S', 'D', '_', '6'): | ||
| 78 | case MKBETAG('S', 'D', '_', '7'): | ||
| 79 | case MKBETAG('S', 'D', '_', '8'): | ||
| 80 | ✗ | av_log(s, AV_LOG_WARNING, "Unsupported chunk!\n"); | |
| 81 | ✗ | case MKBETAG('S', 'D', 'A', '_'): | |
| 82 | case MKBETAG('S', 'D', '_', 'A'): | ||
| 83 | ✗ | channels = 1; | |
| 84 | ✗ | break; | |
| 85 | } | ||
| 86 | |||
| 87 | ✗ | if (channels) | |
| 88 | ✗ | break; | |
| 89 | } | ||
| 90 | |||
| 91 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 92 | ✗ | st->codecpar->ch_layout.nb_channels = channels; | |
| 93 | ✗ | st->codecpar->sample_rate = rate; | |
| 94 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; | |
| 95 | ✗ | st->codecpar->block_align = 2 * channels; | |
| 96 | |||
| 97 | ✗ | return 0; | |
| 98 | } | ||
| 99 | |||
| 100 | const FFInputFormat ff_nsp_demuxer = { | ||
| 101 | .p.name = "nsp", | ||
| 102 | .p.long_name = NULL_IF_CONFIG_SMALL("Computerized Speech Lab NSP"), | ||
| 103 | .p.extensions = "nsp", | ||
| 104 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 105 | .read_probe = nsp_probe, | ||
| 106 | .read_header = nsp_read_header, | ||
| 107 | .read_packet = ff_pcm_read_packet, | ||
| 108 | .read_seek = ff_pcm_read_seek, | ||
| 109 | }; | ||
| 110 |