2 * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
23 /** \file aac_afh.c para_server's aac audio format handler */
25 #include "server.cmdline.h"
34 /** size of the input buffer, must be big enough to hold header */
35 #define DEFAULT_INBUF_SIZE 65536
37 static struct audio_format_handler
*af
;
39 static unsigned char *inbuf
;
40 static size_t inbuf_size
, inbuf_len
, *chunk_table
, num_chunks
;
42 static void aac_close_audio_file(void)
54 static int aac_find_stsz(unsigned char *buf
, unsigned buflen
, size_t *skip
)
58 for (i
= 0; i
+ 16 < buflen
; i
++) {
59 unsigned char *p
= buf
+ i
;
60 unsigned sample_count
, sample_size
;
62 if (p
[0] != 's' || p
[1] != 't' || p
[2] != 's' || p
[3] != 'z')
64 PARA_INFO_LOG("found stsz@%d\n", i
);
66 sample_size
= aac_read_int32(buf
+ i
);
67 PARA_INFO_LOG("sample size: %d\n", sample_size
);
69 sample_count
= aac_read_int32(buf
+ i
);
71 PARA_INFO_LOG("sample count: %d\n", sample_count
);
75 PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen
);
79 static int read_chunk_table(size_t skip
)
85 ret
= aac_find_stsz(inbuf
, inbuf_len
, &skip
);
88 ret
= read(fileno(infile
), inbuf
, inbuf_size
);
91 PARA_INFO_LOG("next buffer: %d bytes\n", ret
);
94 PARA_INFO_LOG("sz table has %zu entries\n", num_chunks
);
95 chunk_table
= para_malloc((num_chunks
+ 1) * sizeof(size_t));
96 for (i
= 1; i
<= num_chunks
; i
++) {
97 if (skip
+ 4 > inbuf_len
) {
98 skip
= inbuf_len
- skip
;
99 memmove(inbuf
, inbuf
+ inbuf_len
- skip
, skip
);
100 ret
= read(fileno(infile
), inbuf
+ skip
, inbuf_size
- skip
);
103 inbuf_len
= ret
+ skip
;
105 PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len
);
107 sum
+= aac_read_int32(inbuf
+ skip
);
108 chunk_table
[i
] = sum
;
110 if (i
< 10 || i
+ 10 > num_chunks
)
111 PARA_DEBUG_LOG("offset #%d: %zu\n", i
, chunk_table
[i
]);
116 static long unsigned aac_set_chunk_tv(mp4AudioSpecificConfig
*mp4ASC
)
118 float tmp
= mp4ASC
->sbr_present_flag
== 1? 2047 : 1023,
119 ms
= 1000.0 * num_chunks
* tmp
/ mp4ASC
->samplingFrequency
;
120 struct timeval total
;
123 tv_divide(num_chunks
, &total
, &af
->chunk_tv
);
124 PARA_INFO_LOG("%luHz, %fs (%zd x %lums)\n",
125 mp4ASC
->samplingFrequency
, ms
/ 1000,
126 num_chunks
, tv2ms(&af
->chunk_tv
));
131 * Init m4a file and write some tech data to given pointers.
133 static int aac_get_file_info(FILE *file
, char *info_str
, long unsigned *frames
,
134 int *seconds
, size_t **vss_chunk_table
)
136 int i
, ret
, decoder_len
;
138 unsigned long rate
= 0;
139 unsigned char channels
= 0;
140 mp4AudioSpecificConfig mp4ASC
;
141 NeAACDecHandle handle
;
143 inbuf_size
= DEFAULT_INBUF_SIZE
;
144 inbuf
= para_malloc(inbuf_size
);
147 ret
= read(fileno(infile
), inbuf
, inbuf_size
);
151 ret
= aac_find_esds(inbuf
, inbuf_len
, &skip
);
156 ret
= NeAACDecInit(handle
, inbuf
+ skip
,
157 decoder_len
, &rate
, &channels
);
159 return -E_AACDEC_INIT
;
161 PARA_INFO_LOG("rate: %lu, channels: %d\n", rate
, channels
);
162 ret
= NeAACDecAudioSpecificConfig(inbuf
+ skip
, inbuf_len
- skip
,
166 ret
= read_chunk_table(skip
);
169 *frames
= num_chunks
;
170 *seconds
= aac_set_chunk_tv(&mp4ASC
);
171 *vss_chunk_table
= chunk_table
;
173 ret
= aac_find_entry_point(inbuf
, inbuf_len
, &skip
);
176 ret
= read(fileno(infile
), inbuf
, inbuf_size
);
179 PARA_INFO_LOG("next buffer: %d bytes\n", ret
);
181 chunk_table
[0] = ret
;
182 for (i
= 1; i
<= num_chunks
; i
++)
183 chunk_table
[i
] += ret
;
184 sprintf(info_str
, "audio_file_info1:%zu x %lums\n"
185 "audio_file_info2:\n"
186 "audio_file_info3:\n",
188 tv2ms(&af
->chunk_tv
));
189 tv_scale(20, &af
->chunk_tv
, &af
->eof_tv
);
193 static const char* aac_suffixes
[] = {"m4a", "mp4", NULL
};
194 /** the init function of the aac audio format handler */
195 void aac_afh_init(struct audio_format_handler
*p
)
198 af
->get_file_info
= aac_get_file_info
,
199 af
->close_audio_file
= aac_close_audio_file
;
200 af
->get_header_info
= NULL
;
201 af
->suffixes
= aac_suffixes
;