FFmpeg/libavformat/wsddec.c
Michael Niedermayer f6d1b18b3d avformat/rawdec: Make the raw packet size configurable
This allows testing parsers with a wider range of input packet sizes.
Which is important and usefull for regression testing, some of our
parsers in fact to not work if the packet size is changed from 1024

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2019-07-17 23:18:50 +02:00

177 lines
5.2 KiB
C

/*
* 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(const 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 >> i) & 1)
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);
}
FF_RAW_DEMUXER_CLASS(wsd)
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,
.priv_data_size = sizeof(FFRawDemuxerContext),
.priv_class = &wsd_demuxer_class,
};