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