138 lines
5.2 KiB
C
Executable file
138 lines
5.2 KiB
C
Executable file
/*
|
|
* 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(const 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[256], 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->codecpar->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->codecpar->bits_per_coded_sample)
|
|
st->codecpar->bits_per_coded_sample = bps << 3;
|
|
|
|
if (!av_strcasecmp(coding, "pcm")) {
|
|
if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
|
|
st->codecpar->codec_id = ff_get_pcm_codec_id(st->codecpar->bits_per_coded_sample,
|
|
0, be, 0xFFFF);
|
|
} else if (!av_strcasecmp(coding, "alaw")) {
|
|
st->codecpar->codec_id = AV_CODEC_ID_PCM_ALAW;
|
|
} else if (!av_strcasecmp(coding, "ulaw") ||
|
|
!av_strcasecmp(coding, "mu-law")) {
|
|
st->codecpar->codec_id = AV_CODEC_ID_PCM_MULAW;
|
|
} else if (!av_strncasecmp(coding, "pcm,embedded-shorten", 20)) {
|
|
st->codecpar->codec_id = AV_CODEC_ID_SHORTEN;
|
|
if (ff_alloc_extradata(st->codecpar, 1))
|
|
st->codecpar->extradata[0] = 1;
|
|
} else {
|
|
avpriv_request_sample(s, "coding %s", coding);
|
|
}
|
|
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
|
|
|
st->codecpar->block_align = st->codecpar->bits_per_coded_sample * st->codecpar->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 %u", &st->codecpar->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, "mu-law")) {
|
|
st->codecpar->codec_id = AV_CODEC_ID_PCM_MULAW;
|
|
} 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 %d", &bps);
|
|
} else if (!memcmp(buffer, "sample_rate", 11)) {
|
|
sscanf(buffer, "%*s %*s %d", &st->codecpar->sample_rate);
|
|
} else if (!memcmp(buffer, "sample_sig_bits", 15)) {
|
|
sscanf(buffer, "%*s %*s %d", &st->codecpar->bits_per_coded_sample);
|
|
} else {
|
|
char key[32], value[32];
|
|
if (sscanf(buffer, "%31s %*s %31s", key, value) == 2) {
|
|
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,
|
|
};
|