diff options
Diffstat (limited to 'libavformat/nistspheredec.c')
| -rw-r--r-- | libavformat/nistspheredec.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/libavformat/nistspheredec.c b/libavformat/nistspheredec.c new file mode 100644 index 0000000000..2f17f9eeb0 --- /dev/null +++ b/libavformat/nistspheredec.c @@ -0,0 +1,131 @@ +/* + * NIST Sphere demuxer + * Copyright (c) 2012 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 nist_probe(AVProbeData *p) +{ + if (AV_RL64(p->buf) == AV_RL64("NIST_1A\x0a")) + return AVPROBE_SCORE_MAX; + return 0; +} + +static int nist_read_header(AVFormatContext *s) +{ + char buffer[32], coding[32] = "pcm", format[32] = "01"; + int bps = 0, be = 0; + int32_t header_size = -1; + AVStream *st; + + st = avformat_new_stream(s, NULL); + if (!st) + return AVERROR(ENOMEM); + + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; + + ff_get_line(s->pb, buffer, sizeof(buffer)); + ff_get_line(s->pb, buffer, sizeof(buffer)); + sscanf(buffer, "%"SCNd32, &header_size); + if (header_size <= 0) + return AVERROR_INVALIDDATA; + + while (!avio_feof(s->pb)) { + ff_get_line(s->pb, buffer, sizeof(buffer)); + + if (avio_tell(s->pb) >= header_size) + return AVERROR_INVALIDDATA; + + if (!memcmp(buffer, "end_head", 8)) { + if (!st->codec->bits_per_coded_sample) + st->codec->bits_per_coded_sample = bps << 3; + + if (!av_strcasecmp(coding, "pcm")) { + st->codec->codec_id = ff_get_pcm_codec_id(st->codec->bits_per_coded_sample, + 0, be, 0xFFFF); + } else if (!av_strcasecmp(coding, "alaw")) { + st->codec->codec_id = AV_CODEC_ID_PCM_ALAW; + } else if (!av_strcasecmp(coding, "ulaw") || + !av_strcasecmp(coding, "mu-law")) { + st->codec->codec_id = AV_CODEC_ID_PCM_MULAW; + } else { + avpriv_request_sample(s, "coding %s", coding); + } + + avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); + + st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8; + + if (avio_tell(s->pb) > header_size) + return AVERROR_INVALIDDATA; + + avio_skip(s->pb, header_size - avio_tell(s->pb)); + + return 0; + } else if (!memcmp(buffer, "channel_count", 13)) { + sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->channels); + } else if (!memcmp(buffer, "sample_byte_format", 18)) { + sscanf(buffer, "%*s %*s %31s", format); + + if (!av_strcasecmp(format, "01")) { + be = 0; + } else if (!av_strcasecmp(format, "10")) { + be = 1; + } else if (av_strcasecmp(format, "1")) { + avpriv_request_sample(s, "sample byte format %s", format); + return AVERROR_PATCHWELCOME; + } + } else if (!memcmp(buffer, "sample_coding", 13)) { + sscanf(buffer, "%*s %*s %31s", coding); + } else if (!memcmp(buffer, "sample_count", 12)) { + sscanf(buffer, "%*s %*s %"SCNd64, &st->duration); + } else if (!memcmp(buffer, "sample_n_bytes", 14)) { + sscanf(buffer, "%*s %*s %"SCNd32, &bps); + } else if (!memcmp(buffer, "sample_rate", 11)) { + sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->sample_rate); + } else if (!memcmp(buffer, "sample_sig_bits", 15)) { + sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->bits_per_coded_sample); + } else { + char key[32], value[32]; + if (sscanf(buffer, "%31s %*s %31s", key, value) == 3) { + av_dict_set(&s->metadata, key, value, AV_DICT_APPEND); + } else { + av_log(s, AV_LOG_ERROR, "Failed to parse '%s' as metadata\n", buffer); + } + } + } + + return AVERROR_EOF; +} + +AVInputFormat ff_nistsphere_demuxer = { + .name = "nistsphere", + .long_name = NULL_IF_CONFIG_SMALL("NIST SPeech HEader REsources"), + .read_probe = nist_probe, + .read_header = nist_read_header, + .read_packet = ff_pcm_read_packet, + .read_seek = ff_pcm_read_seek, + .extensions = "nist,sph", + .flags = AVFMT_GENERIC_INDEX, +}; |