2 * Copyright (C) 2006 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"
33 /* must be big enough to hold header */
34 #define DEFAULT_INBUF_SIZE 65536
37 static int inbuf_size
;
38 static unsigned char *inbuf
;
39 static size_t inbuf_len
;
40 struct audio_format
*af
;
41 static size_t num_chunks
;
44 static size_t *chunk_table
;
45 NeAACDecHandle handle
;
47 static void aac_close_audio_file(void)
55 static int aac_find_stsz(unsigned char *buf
, unsigned buflen
, size_t *skip
)
59 for (i
= 0; i
+ 16 < buflen
; i
++) {
60 unsigned char *p
= buf
+ i
;
61 unsigned sample_count
, sample_size
;
63 if (p
[0] != 's' || p
[1] != 't' || p
[2] != 's' || p
[3] != 'z')
65 PARA_INFO_LOG("found stsz@%d\n", i
);
67 sample_size
= aac_read_int32(buf
+ i
);
68 PARA_INFO_LOG("sample size: %d\n", sample_size
);
70 sample_count
= aac_read_int32(buf
+ i
);
72 PARA_INFO_LOG("sample count: %d\n", sample_count
);
76 PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen
);
80 static int read_chunk_table(size_t skip
)
86 ret
= aac_find_stsz(inbuf
, inbuf_len
, &skip
);
89 ret
= read(fileno(infile
), inbuf
, inbuf_size
);
92 PARA_INFO_LOG("next buffer: %d bytes\n", ret
);
95 PARA_INFO_LOG("sz table has %zu entries\n", num_chunks
);
97 chunk_table
= para_malloc(num_chunks
* sizeof(size_t));
98 for (i
= 0; i
< num_chunks
; i
++) {
99 if (skip
+ 4 > inbuf_len
) {
100 skip
= inbuf_len
- skip
;
101 memmove(inbuf
, inbuf
+ inbuf_len
- skip
, skip
);
102 ret
= read(fileno(infile
), inbuf
+ skip
, inbuf_size
- skip
);
105 inbuf_len
= ret
+ skip
;
107 PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len
);
109 sum
+= aac_read_int32(inbuf
+ skip
);
110 chunk_table
[i
] = sum
;
112 if (i
< 10 || i
> num_chunks
- 10)
113 PARA_DEBUG_LOG("offset #%d: %zu\n", i
, chunk_table
[i
]);
120 * Init m4a file and write some tech data to given pointers.
122 static int aac_get_file_info(FILE *file
, char *info_str
, long unsigned *frames
,
125 int ret
, decoder_len
;
127 unsigned long rate
= 0;
128 unsigned char channels
= 0;
129 mp4AudioSpecificConfig mp4ASC
;
132 inbuf_size
= DEFAULT_INBUF_SIZE
;
133 inbuf
= para_malloc(inbuf_size
);
136 PARA_INFO_LOG("file: %p\n", file
);
137 ret
= read(fileno(infile
), inbuf
, inbuf_size
);
138 PARA_INFO_LOG("read %d bytes\n", ret
);
141 PARA_INFO_LOG("checking aac %d bytes\n", ret
);
143 ret
= aac_find_esds(inbuf
, inbuf_len
, &skip
);
148 ret
= NeAACDecInit(handle
, inbuf
+ skip
,
149 decoder_len
, &rate
, &channels
);
151 return -E_AACDEC_INIT
;
153 PARA_INFO_LOG("rate: %lu, channels: %d\n", rate
, channels
);
154 ret
= NeAACDecAudioSpecificConfig(inbuf
+ skip
, inbuf_len
- skip
, &mp4ASC
);
156 PARA_DEBUG_LOG("mp4ASC.samplingFrequency: %lu\n",
157 mp4ASC
.samplingFrequency
);
159 PARA_WARNING_LOG("no mp4ASC %s\n", "");
161 ret
= read_chunk_table(skip
);
164 *frames
= num_chunks
;
166 ret
= aac_find_entry_point(inbuf
, inbuf_len
, &skip
);
169 ret
= read(fileno(infile
), inbuf
, inbuf_size
);
172 PARA_INFO_LOG("next buffer: %d bytes\n", ret
);
175 PARA_INFO_LOG("offset table has %zu entries, entry: %zu\n", num_chunks
,
178 sprintf(info_str
, "audio_file_info1:%zu x %lums\n"
179 "audio_file_info2:\n"
180 "audio_file_info3:\n",
182 tv2ms(&af
->chunk_tv
));
186 struct timeval total_tv
;
187 tv_scale(num_chunks
, &af
->chunk_tv
, &total_tv
);
188 *seconds
= tv2ms(&total_tv
) / 1000;
189 PARA_INFO_LOG("%d seconds, %zu chunks\n", *seconds
, num_chunks
);
196 * Simple stream reposition routine
198 static int aac_reposition_stream(long unsigned request
)
201 // return -E_AAC_REPOS;
204 static char *aac_read_chunk(long unsigned current_chunk
, ssize_t
*len
)
210 if (current_chunk
>= num_chunks
)
212 if (!current_chunk
) {
213 *len
= chunk_table
[0];
216 *len
= chunk_table
[current_chunk
] - chunk_table
[current_chunk
- 1];
217 pos
= entry
+ chunk_table
[current_chunk
- 1];
219 if (inbuf_size
< *len
) {
220 inbuf
= para_realloc(inbuf
, *len
);
223 // PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
225 ret
= fseek(infile
, pos
, SEEK_SET
);
228 ret
= para_fread(inbuf
, *len
, 1, infile
);
231 // PARA_DEBUG_LOG("ret: %d, inbuf[0]: %lx - %lx\n", ret, (long unsigned) inbuf[0],
232 // (long unsigned) inbuf[4]);
233 return (char *)inbuf
;
236 /** the init function of the aac audio format handler */
237 void aac_afh_init(void *p
)
240 af
->reposition_stream
= aac_reposition_stream
;
241 af
->get_file_info
= aac_get_file_info
,
242 af
->read_chunk
= aac_read_chunk
;
243 af
->close_audio_file
= aac_close_audio_file
;
244 af
->get_header_info
= NULL
;
245 af
->chunk_tv
.tv_sec
= 0;
246 af
->chunk_tv
.tv_usec
= 23120;
247 tv_scale(3, &af
->chunk_tv
, &af
->eof_tv
);