129 lines
4.6 KiB
C
129 lines
4.6 KiB
C
/*
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* NIST Sphere demuxer
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#include "pcm.h"
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static int nist_probe(AVProbeData *p)
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{
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if (AV_RL64(p->buf) == AV_RL64("NIST_1A\x0a"))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int nist_read_header(AVFormatContext *s)
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{
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char buffer[32], coding[32] = "pcm", format[32] = "01";
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int bps = 0, be = 0;
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int32_t header_size;
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AVStream *st;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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ff_get_line(s->pb, buffer, sizeof(buffer));
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ff_get_line(s->pb, buffer, sizeof(buffer));
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sscanf(buffer, "%"SCNd32, &header_size);
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if (header_size <= 0)
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return AVERROR_INVALIDDATA;
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while (!url_feof(s->pb)) {
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ff_get_line(s->pb, buffer, sizeof(buffer));
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if (avio_tell(s->pb) >= header_size)
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return AVERROR_INVALIDDATA;
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if (!memcmp(buffer, "end_head", 8)) {
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if (!st->codec->bits_per_coded_sample)
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st->codec->bits_per_coded_sample = bps << 3;
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if (!av_strcasecmp(coding, "pcm")) {
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st->codec->codec_id = ff_get_pcm_codec_id(st->codec->bits_per_coded_sample,
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0, be, 0xFFFF);
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} else if (!av_strcasecmp(coding, "alaw")) {
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st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;
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} else if (!av_strcasecmp(coding, "ulaw") ||
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!av_strcasecmp(coding, "mu-law")) {
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st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;
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} else {
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av_log_ask_for_sample(s, "unsupported coding: %s\n", coding);
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}
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
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st->codec->block_align = st->codec->bits_per_coded_sample * st->codec->channels / 8;
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if (avio_tell(s->pb) > header_size)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, header_size - avio_tell(s->pb));
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return 0;
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} else if (!memcmp(buffer, "channel_count", 13)) {
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sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->channels);
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} else if (!memcmp(buffer, "sample_byte_format", 18)) {
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sscanf(buffer, "%*s %*s %31s", format);
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if (!av_strcasecmp(format, "01")) {
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be = 0;
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} else if (!av_strcasecmp(format, "10")) {
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be = 1;
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} else if (av_strcasecmp(format, "1")) {
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av_log_ask_for_sample(s, "unsupported sample byte format: %s\n", format);
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return AVERROR_PATCHWELCOME;
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}
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} else if (!memcmp(buffer, "sample_coding", 13)) {
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sscanf(buffer, "%*s %*s %31s", coding);
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} else if (!memcmp(buffer, "sample_count", 12)) {
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sscanf(buffer, "%*s %*s %"SCNd64, &st->duration);
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} else if (!memcmp(buffer, "sample_n_bytes", 14)) {
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sscanf(buffer, "%*s %*s %"SCNd32, &bps);
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} else if (!memcmp(buffer, "sample_rate", 11)) {
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sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->sample_rate);
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} else if (!memcmp(buffer, "sample_sig_bits", 15)) {
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sscanf(buffer, "%*s %*s %"SCNd32, &st->codec->bits_per_coded_sample);
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} else {
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char key[32], value[32];
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sscanf(buffer, "%31s %*s %31s", key, value);
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av_dict_set(&s->metadata, key, value, AV_DICT_APPEND);
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}
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}
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return AVERROR_EOF;
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}
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AVInputFormat ff_nistsphere_demuxer = {
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.name = "nistsphere",
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.long_name = NULL_IF_CONFIG_SMALL("NIST SPeech HEader REsources"),
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.read_probe = nist_probe,
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.read_header = nist_read_header,
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.read_packet = ff_pcm_read_packet,
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.read_seek = ff_pcm_read_seek,
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.extensions = "nist,sph",
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.flags = AVFMT_GENERIC_INDEX,
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};
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