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/*
* 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[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,
};
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