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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6147 | serge | 1 | /* |
| 2 | * NIST Sphere demuxer |
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| 3 | * Copyright (c) 2012 Paul B Mahol |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "libavutil/avstring.h" |
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| 23 | #include "libavutil/intreadwrite.h" |
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| 24 | #include "avformat.h" |
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| 25 | #include "internal.h" |
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| 26 | #include "pcm.h" |
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| 27 | |||
| 28 | static int nist_probe(AVProbeData *p) |
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| 29 | { |
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| 30 | if (AV_RL64(p->buf) == AV_RL64("NIST_1A\x0a")) |
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| 31 | return AVPROBE_SCORE_MAX; |
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| 32 | return 0; |
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| 33 | } |
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| 34 | |||
| 35 | static int nist_read_header(AVFormatContext *s) |
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| 36 | { |
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| 37 | char buffer[32], coding[32] = "pcm", format[32] = "01"; |
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| 38 | int bps = 0, be = 0; |
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| 39 | int32_t header_size = -1; |
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| 40 | AVStream *st; |
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| 41 | |||
| 42 | st = avformat_new_stream(s, NULL); |
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| 43 | if (!st) |
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| 44 | return AVERROR(ENOMEM); |
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| 45 | |||
| 46 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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| 47 | |||
| 48 | ff_get_line(s->pb, buffer, sizeof(buffer)); |
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| 49 | ff_get_line(s->pb, buffer, sizeof(buffer)); |
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| 50 | sscanf(buffer, "%"SCNd32, &header_size); |
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| 51 | if (header_size <= 0) |
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| 52 | return AVERROR_INVALIDDATA; |
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| 53 | |||
| 54 | while (!avio_feof(s->pb)) { |
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| 55 | ff_get_line(s->pb, buffer, sizeof(buffer)); |
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| 56 | |||
| 57 | if (avio_tell(s->pb) >= header_size) |
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| 58 | return AVERROR_INVALIDDATA; |
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| 59 | |||
| 60 | if (!memcmp(buffer, "end_head", 8)) { |
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| 61 | if (!st->codec->bits_per_coded_sample) |
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| 62 | st->codec->bits_per_coded_sample = bps << 3; |
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| 63 | |||
| 64 | if (!av_strcasecmp(coding, "pcm")) { |
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| 65 | st->codec->codec_id = ff_get_pcm_codec_id(st->codec->bits_per_coded_sample, |
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| 66 | 0, be, 0xFFFF); |
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| 67 | } else if (!av_strcasecmp(coding, "alaw")) { |
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| 68 | st->codec->codec_id = AV_CODEC_ID_PCM_ALAW; |
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| 69 | } else if (!av_strcasecmp(coding, "ulaw") || |
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| 70 | !av_strcasecmp(coding, "mu-law")) { |
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| 71 | st->codec->codec_id = AV_CODEC_ID_PCM_MULAW; |
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| 72 | } else { |
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| 73 | avpriv_request_sample(s, "coding %s", coding); |
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| 74 | } |
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| 75 | |||
| 76 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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| 77 | |||
| 78 | st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8; |
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| 79 | |||
| 80 | if (avio_tell(s->pb) > header_size) |
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| 81 | return AVERROR_INVALIDDATA; |
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| 82 | |||
| 83 | avio_skip(s->pb, header_size - avio_tell(s->pb)); |
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| 84 | |||
| 85 | return 0; |
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| 86 | } else if (!memcmp(buffer, "channel_count", 13)) { |
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| 87 | sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->channels); |
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| 88 | } else if (!memcmp(buffer, "sample_byte_format", 18)) { |
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| 89 | sscanf(buffer, "%*s %*s %31s", format); |
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| 90 | |||
| 91 | if (!av_strcasecmp(format, "01")) { |
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| 92 | be = 0; |
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| 93 | } else if (!av_strcasecmp(format, "10")) { |
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| 94 | be = 1; |
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| 95 | } else if (av_strcasecmp(format, "1")) { |
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| 96 | avpriv_request_sample(s, "sample byte format %s", format); |
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| 97 | return AVERROR_PATCHWELCOME; |
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| 98 | } |
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| 99 | } else if (!memcmp(buffer, "sample_coding", 13)) { |
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| 100 | sscanf(buffer, "%*s %*s %31s", coding); |
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| 101 | } else if (!memcmp(buffer, "sample_count", 12)) { |
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| 102 | sscanf(buffer, "%*s %*s %"SCNd64, &st->duration); |
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| 103 | } else if (!memcmp(buffer, "sample_n_bytes", 14)) { |
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| 104 | sscanf(buffer, "%*s %*s %"SCNd32, &bps); |
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| 105 | } else if (!memcmp(buffer, "sample_rate", 11)) { |
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| 106 | sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->sample_rate); |
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| 107 | } else if (!memcmp(buffer, "sample_sig_bits", 15)) { |
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| 108 | sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->bits_per_coded_sample); |
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| 109 | } else { |
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| 110 | char key[32], value[32]; |
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| 111 | if (sscanf(buffer, "%31s %*s %31s", key, value) == 3) { |
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| 112 | av_dict_set(&s->metadata, key, value, AV_DICT_APPEND); |
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| 113 | } else { |
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| 114 | av_log(s, AV_LOG_ERROR, "Failed to parse '%s' as metadata\n", buffer); |
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| 115 | } |
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| 116 | } |
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| 117 | } |
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| 118 | |||
| 119 | return AVERROR_EOF; |
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| 120 | } |
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| 121 | |||
| 122 | AVInputFormat ff_nistsphere_demuxer = { |
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| 123 | .name = "nistsphere", |
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| 124 | .long_name = NULL_IF_CONFIG_SMALL("NIST SPeech HEader REsources"), |
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| 125 | .read_probe = nist_probe, |
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| 126 | .read_header = nist_read_header, |
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| 127 | .read_packet = ff_pcm_read_packet, |
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| 128 | .read_seek = ff_pcm_read_seek, |
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| 129 | .extensions = "nist,sph", |
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| 130 | .flags = AVFMT_GENERIC_INDEX, |
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| 131 | }; |