blob: 7031d03e2192c4a41c10e873e8e3ec2d62db66d9 [file] [log] [blame]
/*
* VQF demuxer
* Copyright (c) 2009 Vitor Sessak
*
* 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 "avformat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
typedef struct VqfContext {
int frame_bit_len;
uint8_t last_frame_bits;
int remaining_bits;
} VqfContext;
static int vqf_probe(AVProbeData *probe_packet)
{
if (AV_RL32(probe_packet->buf) != MKTAG('T','W','I','N'))
return 0;
if (!memcmp(probe_packet->buf + 4, "97012000", 8))
return AVPROBE_SCORE_MAX;
if (!memcmp(probe_packet->buf + 4, "00052200", 8))
return AVPROBE_SCORE_MAX;
return AVPROBE_SCORE_MAX/2;
}
static void add_metadata(AVFormatContext *s, const char *tag,
unsigned int tag_len, unsigned int remaining)
{
int len = FFMIN(tag_len, remaining);
char *buf;
if (len == UINT_MAX)
return;
buf = av_malloc(len+1);
if (!buf)
return;
avio_read(s->pb, buf, len);
buf[len] = 0;
av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
}
static int vqf_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
VqfContext *c = s->priv_data;
AVStream *st = av_new_stream(s, 0);
int chunk_tag;
int rate_flag = -1;
int header_size;
int read_bitrate = 0;
int size;
if (!st)
return AVERROR(ENOMEM);
avio_skip(s->pb, 12);
header_size = avio_rb32(s->pb);
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_TWINVQ;
st->start_time = 0;
do {
int len;
chunk_tag = avio_rl32(s->pb);
if (chunk_tag == MKTAG('D','A','T','A'))
break;
len = avio_rb32(s->pb);
if ((unsigned) len > INT_MAX/2) {
av_log(s, AV_LOG_ERROR, "Malformed header\n");
return -1;
}
header_size -= 8;
switch(chunk_tag){
case MKTAG('C','O','M','M'):
st->codec->channels = avio_rb32(s->pb) + 1;
read_bitrate = avio_rb32(s->pb);
rate_flag = avio_rb32(s->pb);
avio_skip(s->pb, len-12);
st->codec->bit_rate = read_bitrate*1000;
st->codec->bits_per_coded_sample = 16;
break;
case MKTAG('N','A','M','E'):
add_metadata(s, "title" , len, header_size);
break;
case MKTAG('(','c',')',' '):
add_metadata(s, "copyright", len, header_size);
break;
case MKTAG('A','U','T','H'):
add_metadata(s, "author" , len, header_size);
break;
case MKTAG('A','L','B','M'):
add_metadata(s, "album" , len, header_size);
break;
case MKTAG('T','R','C','K'):
add_metadata(s, "track" , len, header_size);
break;
case MKTAG('C','O','M','T'):
add_metadata(s, "comment" , len, header_size);
break;
case MKTAG('F','I','L','E'):
add_metadata(s, "filename" , len, header_size);
break;
case MKTAG('D','S','I','Z'):
add_metadata(s, "size" , len, header_size);
break;
case MKTAG('D','A','T','E'):
add_metadata(s, "date" , len, header_size);
break;
case MKTAG('G','E','N','R'):
add_metadata(s, "genre" , len, header_size);
break;
default:
av_log(s, AV_LOG_ERROR, "Unknown chunk: %c%c%c%c\n",
((char*)&chunk_tag)[0], ((char*)&chunk_tag)[1],
((char*)&chunk_tag)[2], ((char*)&chunk_tag)[3]);
avio_skip(s->pb, FFMIN(len, header_size));
break;
}
header_size -= len;
} while (header_size >= 0);
switch (rate_flag) {
case -1:
av_log(s, AV_LOG_ERROR, "COMM tag not found!\n");
return -1;
case 44:
st->codec->sample_rate = 44100;
break;
case 22:
st->codec->sample_rate = 22050;
break;
case 11:
st->codec->sample_rate = 11025;
break;
default:
st->codec->sample_rate = rate_flag*1000;
break;
}
switch (((st->codec->sample_rate/1000) << 8) +
read_bitrate/st->codec->channels) {
case (11<<8) + 8 :
case (8 <<8) + 8 :
case (11<<8) + 10:
case (22<<8) + 32:
size = 512;
break;
case (16<<8) + 16:
case (22<<8) + 20:
case (22<<8) + 24:
size = 1024;
break;
case (44<<8) + 40:
case (44<<8) + 48:
size = 2048;
break;
default:
av_log(s, AV_LOG_ERROR, "Mode not suported: %d Hz, %d kb/s.\n",
st->codec->sample_rate, st->codec->bit_rate);
return -1;
}
c->frame_bit_len = st->codec->bit_rate*size/st->codec->sample_rate;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
return 0;
}
static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
VqfContext *c = s->priv_data;
int ret;
int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
pkt->pos = avio_tell(s->pb);
pkt->stream_index = 0;
if (av_new_packet(pkt, size+2) < 0)
return AVERROR(EIO);
pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
pkt->data[1] = c->last_frame_bits;
ret = avio_read(s->pb, pkt->data+2, size);
if (ret<=0) {
av_free_packet(pkt);
return AVERROR(EIO);
}
c->last_frame_bits = pkt->data[size+1];
c->remaining_bits = (size << 3) - c->frame_bit_len + c->remaining_bits;
return size+2;
}
static int vqf_read_seek(AVFormatContext *s,
int stream_index, int64_t timestamp, int flags)
{
VqfContext *c = s->priv_data;
AVStream *st;
int ret;
int64_t pos;
st = s->streams[stream_index];
pos = av_rescale_rnd(timestamp * st->codec->bit_rate,
st->time_base.num,
st->time_base.den * (int64_t)c->frame_bit_len,
(flags & AVSEEK_FLAG_BACKWARD) ?
AV_ROUND_DOWN : AV_ROUND_UP);
pos *= c->frame_bit_len;
st->cur_dts = av_rescale(pos, st->time_base.den,
st->codec->bit_rate * (int64_t)st->time_base.num);
if ((ret = avio_seek(s->pb, ((pos-7) >> 3) + s->data_offset, SEEK_SET)) < 0)
return ret;
c->remaining_bits = -7 - ((pos-7)&7);
return 0;
}
AVInputFormat ff_vqf_demuxer = {
"vqf",
NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
sizeof(VqfContext),
vqf_probe,
vqf_read_header,
vqf_read_packet,
NULL,
vqf_read_seek,
.extensions = "vqf",
};