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/*
* Wideband Single-bit Data (WSD) demuxer
* Copyright (c) 2014 Peter Ross
*
* 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/intreadwrite.h"
#include "libavutil/timecode.h"
#include "avformat.h"
#include "internal.h"
#include "rawdec.h"
static int wsd_probe(AVProbeData *p)
{
if (p->buf_size < 45 || memcmp(p->buf, "1bit", 4) ||
!AV_RB32(p->buf + 36) || !p->buf[44] ||
(p->buf[0] >= 0x10 && (AV_RB32(p->buf + 20) < 0x80 || AV_RB32(p->buf + 24) < 0x80)))
return 0;
return AVPROBE_SCORE_MAX;
}
static int empty_string(const char *buf, unsigned size)
{
while (size--) {
if (*buf++ != ' ')
return 0;
}
return 1;
}
static int wsd_to_av_channel_layoyt(AVFormatContext *s, int bit)
{
switch (bit) {
case 2: return AV_CH_BACK_RIGHT;
case 3:
avpriv_request_sample(s, "Rr-middle");
break;
case 4: return AV_CH_BACK_CENTER;
case 5:
avpriv_request_sample(s, "Lr-middle");
break;
case 6: return AV_CH_BACK_LEFT;
case 24: return AV_CH_LOW_FREQUENCY;
case 26: return AV_CH_FRONT_RIGHT;
case 27: return AV_CH_FRONT_RIGHT_OF_CENTER;
case 28: return AV_CH_FRONT_CENTER;
case 29: return AV_CH_FRONT_LEFT_OF_CENTER;
case 30: return AV_CH_FRONT_LEFT;
default:
av_log(s, AV_LOG_WARNING, "reserved channel assignment\n");
break;
}
return 0;
}
static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned size)
{
uint8_t *buf;
if (!(size + 1))
return AVERROR(ENOMEM);
buf = av_malloc(size + 1);
if (!buf)
return AVERROR(ENOMEM);
if (avio_read(s->pb, buf, size) != size) {
av_free(buf);
return AVERROR(EIO);
}
if (empty_string(buf, size)) {
av_free(buf);
return 0;
}
buf[size] = 0;
av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
return 0;
}
static int wsd_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVStream *st;
int version;
uint32_t text_offset, data_offset, channel_assign;
char playback_time[AV_TIMECODE_STR_SIZE];
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avio_skip(pb, 8);
version = avio_r8(pb);
av_log(s, AV_LOG_DEBUG, "version: %i.%i\n", version >> 4, version & 0xF);
avio_skip(pb, 11);
if (version < 0x10) {
text_offset = 0x80;
data_offset = 0x800;
avio_skip(pb, 8);
} else {
text_offset = avio_rb32(pb);
data_offset = avio_rb32(pb);
}
avio_skip(pb, 4);
av_timecode_make_smpte_tc_string(playback_time, avio_rb32(pb), 0);
av_dict_set(&s->metadata, "playback_time", playback_time, 0);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = s->iformat->raw_codec_id;
st->codecpar->sample_rate = avio_rb32(pb) / 8;
avio_skip(pb, 4);
st->codecpar->channels = avio_r8(pb) & 0xF;
st->codecpar->bit_rate = (int64_t)st->codecpar->channels * st->codecpar->sample_rate * 8LL;
if (!st->codecpar->channels)
return AVERROR_INVALIDDATA;
avio_skip(pb, 3);
channel_assign = avio_rb32(pb);
if (!(channel_assign & 1)) {
int i;
for (i = 1; i < 32; i++)
if (channel_assign & (1 << i))
st->codecpar->channel_layout |= wsd_to_av_channel_layoyt(s, i);
}
avio_skip(pb, 16);
if (avio_rb32(pb))
avpriv_request_sample(s, "emphasis");
if (avio_seek(pb, text_offset, SEEK_SET) >= 0) {
get_metadata(s, "title", 128);
get_metadata(s, "composer", 128);
get_metadata(s, "song_writer", 128);
get_metadata(s, "artist", 128);
get_metadata(s, "album", 128);
get_metadata(s, "genre", 32);
get_metadata(s, "date", 32);
get_metadata(s, "location", 32);
get_metadata(s, "comment", 512);
get_metadata(s, "user", 512);
}
return avio_seek(pb, data_offset, SEEK_SET);
}
AVInputFormat ff_wsd_demuxer = {
.name = "wsd",
.long_name = NULL_IF_CONFIG_SMALL("Wideband Single-bit Data (WSD)"),
.read_probe = wsd_probe,
.read_header = wsd_read_header,
.read_packet = ff_raw_read_partial_packet,
.extensions = "wsd",
.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
.raw_codec_id = AV_CODEC_ID_DSD_MSBF,
};
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