0,0 → 1,294 |
/* |
* 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 "internal.h" |
#include "libavutil/intreadwrite.h" |
#include "libavutil/dict.h" |
#include "libavutil/mathematics.h" |
#include "riff.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; |
|
if (AV_RL32(probe_packet->buf + 12) > (1<<27)) |
return AVPROBE_SCORE_EXTENSION/2; |
|
return AVPROBE_SCORE_EXTENSION; |
} |
|
static void add_metadata(AVFormatContext *s, uint32_t tag, |
unsigned int tag_len, unsigned int remaining) |
{ |
int len = FFMIN(tag_len, remaining); |
char *buf, key[5] = {0}; |
|
if (len == UINT_MAX) |
return; |
|
buf = av_malloc(len+1); |
if (!buf) |
return; |
avio_read(s->pb, buf, len); |
buf[len] = 0; |
AV_WL32(key, tag); |
av_dict_set(&s->metadata, key, buf, AV_DICT_DONT_STRDUP_VAL); |
} |
|
static const AVMetadataConv vqf_metadata_conv[] = { |
{ "(c) ", "copyright" }, |
{ "ARNG", "arranger" }, |
{ "AUTH", "author" }, |
{ "BAND", "band" }, |
{ "CDCT", "conductor" }, |
{ "COMT", "comment" }, |
{ "FILE", "filename" }, |
{ "GENR", "genre" }, |
{ "LABL", "publisher" }, |
{ "MUSC", "composer" }, |
{ "NAME", "title" }, |
{ "NOTE", "note" }, |
{ "PROD", "producer" }, |
{ "PRSN", "personnel" }, |
{ "REMX", "remixer" }, |
{ "SING", "singer" }, |
{ "TRCK", "track" }, |
{ "WORD", "words" }, |
{ 0 }, |
}; |
|
static int vqf_read_header(AVFormatContext *s) |
{ |
VqfContext *c = s->priv_data; |
AVStream *st = avformat_new_stream(s, NULL); |
int chunk_tag; |
int rate_flag = -1; |
int header_size; |
int read_bitrate = 0; |
int size; |
uint8_t comm_chunk[12]; |
|
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 = AV_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'): |
avio_read(s->pb, comm_chunk, 12); |
st->codec->channels = AV_RB32(comm_chunk ) + 1; |
read_bitrate = AV_RB32(comm_chunk + 4); |
rate_flag = AV_RB32(comm_chunk + 8); |
avio_skip(s->pb, len-12); |
|
if (st->codec->channels <= 0) { |
av_log(s, AV_LOG_ERROR, "Invalid number of channels\n"); |
return AVERROR_INVALIDDATA; |
} |
|
st->codec->bit_rate = read_bitrate*1000; |
break; |
case MKTAG('D','S','I','Z'): // size of compressed data |
{ |
av_dict_set_int(&s->metadata, "size", avio_rb32(s->pb), 0); |
} |
break; |
case MKTAG('Y','E','A','R'): // recording date |
case MKTAG('E','N','C','D'): // compression date |
case MKTAG('E','X','T','R'): // reserved |
case MKTAG('_','Y','M','H'): // reserved |
case MKTAG('_','N','T','T'): // reserved |
case MKTAG('_','I','D','3'): // reserved for ID3 tags |
avio_skip(s->pb, FFMIN(len, header_size)); |
break; |
default: |
add_metadata(s, chunk_tag, len, header_size); |
break; |
} |
|
header_size -= len; |
|
} while (header_size >= 0 && !avio_feof(s->pb)); |
|
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: |
if (rate_flag < 8 || rate_flag > 44) { |
av_log(s, AV_LOG_ERROR, "Invalid rate flag %d\n", rate_flag); |
return AVERROR_INVALIDDATA; |
} |
st->codec->sample_rate = rate_flag*1000; |
break; |
} |
|
if (read_bitrate / st->codec->channels < 8 || |
read_bitrate / st->codec->channels > 48) { |
av_log(s, AV_LOG_ERROR, "Invalid bitrate per channel %d\n", |
read_bitrate / st->codec->channels); |
return AVERROR_INVALIDDATA; |
} |
|
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; |
avpriv_set_pts_info(st, 64, size, st->codec->sample_rate); |
|
/* put first 12 bytes of COMM chunk in extradata */ |
if (ff_alloc_extradata(st->codec, 12)) |
return AVERROR(ENOMEM); |
memcpy(st->codec->extradata, comm_chunk, 12); |
|
ff_metadata_conv_ctx(s, NULL, vqf_metadata_conv); |
|
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; |
|
if (av_new_packet(pkt, size+2) < 0) |
return AVERROR(EIO); |
|
pkt->pos = avio_tell(s->pb); |
pkt->stream_index = 0; |
pkt->duration = 1; |
|
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 != size) { |
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; |
int64_t 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->internal->data_offset, SEEK_SET)) < 0) |
return ret; |
|
c->remaining_bits = -7 - ((pos-7)&7); |
return 0; |
} |
|
AVInputFormat ff_vqf_demuxer = { |
.name = "vqf", |
.long_name = NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"), |
.priv_data_size = sizeof(VqfContext), |
.read_probe = vqf_probe, |
.read_header = vqf_read_header, |
.read_packet = vqf_read_packet, |
.read_seek = vqf_read_seek, |
.extensions = "vqf,vql,vqe", |
}; |