3 * Copyright (c) 2009 Vitor Sessak
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/dict.h"
26 #include "libavutil/mathematics.h"
29 typedef struct VqfContext
{
31 uint8_t last_frame_bits
;
35 static int vqf_probe(AVProbeData
*probe_packet
)
37 if (AV_RL32(probe_packet
->buf
) != MKTAG('T','W','I','N'))
40 if (!memcmp(probe_packet
->buf
+ 4, "97012000", 8))
41 return AVPROBE_SCORE_MAX
;
43 if (!memcmp(probe_packet
->buf
+ 4, "00052200", 8))
44 return AVPROBE_SCORE_MAX
;
46 if (AV_RL32(probe_packet
->buf
+ 12) > (1<<27))
47 return AVPROBE_SCORE_EXTENSION
/2;
49 return AVPROBE_SCORE_EXTENSION
;
52 static void add_metadata(AVFormatContext
*s
, uint32_t tag
,
53 unsigned int tag_len
, unsigned int remaining
)
55 int len
= FFMIN(tag_len
, remaining
);
56 char *buf
, key
[5] = {0};
61 buf
= av_malloc(len
+1);
64 avio_read(s
->pb
, buf
, len
);
67 av_dict_set(&s
->metadata
, key
, buf
, AV_DICT_DONT_STRDUP_VAL
);
70 static const AVMetadataConv vqf_metadata_conv
[] = {
71 { "(c) ", "copyright" },
72 { "ARNG", "arranger" },
75 { "CDCT", "conductor" },
76 { "COMT", "comment" },
77 { "FILE", "filename" },
79 { "LABL", "publisher" },
80 { "MUSC", "composer" },
83 { "PROD", "producer" },
84 { "PRSN", "personnel" },
85 { "REMX", "remixer" },
92 static int vqf_read_header(AVFormatContext
*s
)
94 VqfContext
*c
= s
->priv_data
;
95 AVStream
*st
= avformat_new_stream(s
, NULL
);
101 uint8_t comm_chunk
[12];
104 return AVERROR(ENOMEM
);
106 avio_skip(s
->pb
, 12);
108 header_size
= avio_rb32(s
->pb
);
110 st
->codec
->codec_type
= AVMEDIA_TYPE_AUDIO
;
111 st
->codec
->codec_id
= AV_CODEC_ID_TWINVQ
;
116 chunk_tag
= avio_rl32(s
->pb
);
118 if (chunk_tag
== MKTAG('D','A','T','A'))
121 len
= avio_rb32(s
->pb
);
123 if ((unsigned) len
> INT_MAX
/2) {
124 av_log(s
, AV_LOG_ERROR
, "Malformed header\n");
131 case MKTAG('C','O','M','M'):
132 avio_read(s
->pb
, comm_chunk
, 12);
133 st
->codec
->channels
= AV_RB32(comm_chunk
) + 1;
134 read_bitrate
= AV_RB32(comm_chunk
+ 4);
135 rate_flag
= AV_RB32(comm_chunk
+ 8);
136 avio_skip(s
->pb
, len
-12);
138 if (st
->codec
->channels
<= 0) {
139 av_log(s
, AV_LOG_ERROR
, "Invalid number of channels\n");
140 return AVERROR_INVALIDDATA
;
143 st
->codec
->bit_rate
= read_bitrate
*1000;
145 case MKTAG('D','S','I','Z'): // size of compressed data
147 av_dict_set_int(&s
->metadata
, "size", avio_rb32(s
->pb
), 0);
150 case MKTAG('Y','E','A','R'): // recording date
151 case MKTAG('E','N','C','D'): // compression date
152 case MKTAG('E','X','T','R'): // reserved
153 case MKTAG('_','Y','M','H'): // reserved
154 case MKTAG('_','N','T','T'): // reserved
155 case MKTAG('_','I','D','3'): // reserved for ID3 tags
156 avio_skip(s
->pb
, FFMIN(len
, header_size
));
159 add_metadata(s
, chunk_tag
, len
, header_size
);
165 } while (header_size
>= 0 && !avio_feof(s
->pb
));
169 av_log(s
, AV_LOG_ERROR
, "COMM tag not found!\n");
172 st
->codec
->sample_rate
= 44100;
175 st
->codec
->sample_rate
= 22050;
178 st
->codec
->sample_rate
= 11025;
181 if (rate_flag
< 8 || rate_flag
> 44) {
182 av_log(s
, AV_LOG_ERROR
, "Invalid rate flag %d\n", rate_flag
);
183 return AVERROR_INVALIDDATA
;
185 st
->codec
->sample_rate
= rate_flag
*1000;
189 if (read_bitrate
/ st
->codec
->channels
< 8 ||
190 read_bitrate
/ st
->codec
->channels
> 48) {
191 av_log(s
, AV_LOG_ERROR
, "Invalid bitrate per channel %d\n",
192 read_bitrate
/ st
->codec
->channels
);
193 return AVERROR_INVALIDDATA
;
196 switch (((st
->codec
->sample_rate
/1000) << 8) +
197 read_bitrate
/st
->codec
->channels
) {
214 av_log(s
, AV_LOG_ERROR
, "Mode not suported: %d Hz, %d kb/s.\n",
215 st
->codec
->sample_rate
, st
->codec
->bit_rate
);
218 c
->frame_bit_len
= st
->codec
->bit_rate
*size
/st
->codec
->sample_rate
;
219 avpriv_set_pts_info(st
, 64, size
, st
->codec
->sample_rate
);
221 /* put first 12 bytes of COMM chunk in extradata */
222 if (ff_alloc_extradata(st
->codec
, 12))
223 return AVERROR(ENOMEM
);
224 memcpy(st
->codec
->extradata
, comm_chunk
, 12);
226 ff_metadata_conv_ctx(s
, NULL
, vqf_metadata_conv
);
231 static int vqf_read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
233 VqfContext
*c
= s
->priv_data
;
235 int size
= (c
->frame_bit_len
- c
->remaining_bits
+ 7)>>3;
237 if (av_new_packet(pkt
, size
+2) < 0)
240 pkt
->pos
= avio_tell(s
->pb
);
241 pkt
->stream_index
= 0;
244 pkt
->data
[0] = 8 - c
->remaining_bits
; // Number of bits to skip
245 pkt
->data
[1] = c
->last_frame_bits
;
246 ret
= avio_read(s
->pb
, pkt
->data
+2, size
);
253 c
->last_frame_bits
= pkt
->data
[size
+1];
254 c
->remaining_bits
= (size
<< 3) - c
->frame_bit_len
+ c
->remaining_bits
;
259 static int vqf_read_seek(AVFormatContext
*s
,
260 int stream_index
, int64_t timestamp
, int flags
)
262 VqfContext
*c
= s
->priv_data
;
267 st
= s
->streams
[stream_index
];
268 pos
= av_rescale_rnd(timestamp
* st
->codec
->bit_rate
,
270 st
->time_base
.den
* (int64_t)c
->frame_bit_len
,
271 (flags
& AVSEEK_FLAG_BACKWARD
) ?
272 AV_ROUND_DOWN
: AV_ROUND_UP
);
273 pos
*= c
->frame_bit_len
;
275 st
->cur_dts
= av_rescale(pos
, st
->time_base
.den
,
276 st
->codec
->bit_rate
* (int64_t)st
->time_base
.num
);
278 if ((ret
= avio_seek(s
->pb
, ((pos
-7) >> 3) + s
->data_offset
, SEEK_SET
)) < 0)
281 c
->remaining_bits
= -7 - ((pos
-7)&7);
285 AVInputFormat ff_vqf_demuxer
= {
287 .long_name
= NULL_IF_CONFIG_SMALL("Nippon Telegraph and Telephone Corporation (NTT) TwinVQ"),
288 .priv_data_size
= sizeof(VqfContext
),
289 .read_probe
= vqf_probe
,
290 .read_header
= vqf_read_header
,
291 .read_packet
= vqf_read_packet
,
292 .read_seek
= vqf_read_seek
,
293 .extensions
= "vqf,vql,vqe",