integrate para_client into para_audiod
[paraslash.git] / aac_afh.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
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.
8 *
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.
13 *
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.
17 */
18 /*
19 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
20 * Ahead Software AG
21 */
22
23 /** \file aac_afh.c para_server's aac audio format handler */
24
25 #include "server.cmdline.h"
26 #include "server.h"
27 #include "afs.h"
28 #include "afh.h"
29 #include "error.h"
30 #include "string.h"
31 #include "aac.h"
32 #include "fd.h"
33
34 /* must be big enough to hold header */
35 #define DEFAULT_INBUF_SIZE 65536
36
37 static FILE *infile;
38 static int inbuf_size;
39 static unsigned char *inbuf;
40 static size_t inbuf_len;
41 struct audio_format_handler *af;
42 static size_t num_chunks;
43 static size_t entry;
44
45 static size_t *chunk_table;
46 NeAACDecHandle handle;
47
48 static void aac_close_audio_file(void)
49 {
50 if (!infile)
51 return;
52 fclose(infile);
53 infile = NULL;
54 }
55
56 static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip)
57 {
58 int i;
59
60 for (i = 0; i + 16 < buflen; i++) {
61 unsigned char *p = buf + i;
62 unsigned sample_count, sample_size;
63
64 if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
65 continue;
66 PARA_INFO_LOG("found stsz@%d\n", i);
67 i += 8;
68 sample_size = aac_read_int32(buf + i);
69 PARA_INFO_LOG("sample size: %d\n", sample_size);
70 i += 4;
71 sample_count = aac_read_int32(buf + i);
72 i += 4;
73 PARA_INFO_LOG("sample count: %d\n", sample_count);
74 *skip = i;
75 return sample_count;
76 }
77 PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
78 return -E_STSZ;
79 }
80
81 static int read_chunk_table(size_t skip)
82 {
83 int ret, i;
84 size_t sum = 0;
85
86 for (;;) {
87 ret = aac_find_stsz(inbuf, inbuf_len, &skip);
88 if (ret >= 0)
89 break;
90 ret = read(fileno(infile), inbuf, inbuf_size);
91 if (ret <= 0)
92 return -E_AAC_READ;
93 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
94 }
95 num_chunks = ret;
96 PARA_INFO_LOG("sz table has %zu entries\n", num_chunks);
97 free(chunk_table);
98 chunk_table = para_malloc(num_chunks * sizeof(size_t));
99 for (i = 0; i < num_chunks; i++) {
100 if (skip + 4 > inbuf_len) {
101 skip = inbuf_len - skip;
102 memmove(inbuf, inbuf + inbuf_len - skip, skip);
103 ret = read(fileno(infile), inbuf + skip, inbuf_size - skip);
104 if (ret <= 0)
105 return -E_AAC_READ;
106 inbuf_len = ret + skip;
107 skip = 0;
108 PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len);
109 }
110 sum += aac_read_int32(inbuf + skip);
111 chunk_table[i] = sum;
112 skip += 4;
113 if (i < 10 || i + 10 > num_chunks)
114 PARA_DEBUG_LOG("offset #%d: %zu\n", i, chunk_table[i]);
115 }
116 return 1;
117
118 }
119
120 long unsigned aac_set_chunk_tv(mp4AudioSpecificConfig *mp4ASC)
121 {
122 float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023,
123 ms = 1000.0 * num_chunks * tmp / mp4ASC->samplingFrequency;
124 struct timeval total;
125
126 ms2tv(ms, &total);
127 tv_divide(num_chunks, &total, &af->chunk_tv);
128 PARA_INFO_LOG("%luHz, %fs (%zd x %lums)\n",
129 mp4ASC->samplingFrequency, ms / 1000,
130 num_chunks, tv2ms(&af->chunk_tv));
131 return ms / 1000;
132 }
133
134 /*
135 * Init m4a file and write some tech data to given pointers.
136 */
137 static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
138 int *seconds)
139 {
140 int ret, decoder_len;
141 size_t skip;
142 unsigned long rate = 0;
143 unsigned char channels = 0;
144 mp4AudioSpecificConfig mp4ASC;
145
146 free(inbuf);
147 inbuf_size = DEFAULT_INBUF_SIZE;
148 inbuf = para_malloc(inbuf_size);
149 infile = file;
150
151 ret = read(fileno(infile), inbuf, inbuf_size);
152 if (ret <= 0)
153 return -E_AAC_READ;
154 inbuf_len = ret;
155 ret = aac_find_esds(inbuf, inbuf_len, &skip);
156 if (ret < 0)
157 return ret;
158 decoder_len = ret;
159 handle = aac_open();
160 ret = NeAACDecInit(handle, inbuf + skip,
161 decoder_len, &rate, &channels);
162 if (ret < 0)
163 return -E_AACDEC_INIT;
164 skip += ret;
165 PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
166 ret = NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip,
167 &mp4ASC);
168 if (ret < 0)
169 return -E_MP4ASC;
170 ret = read_chunk_table(skip);
171 if (ret < 0)
172 return ret;
173 *frames = num_chunks;
174 *seconds = aac_set_chunk_tv(&mp4ASC);
175 for (;;) {
176 ret = aac_find_entry_point(inbuf, inbuf_len, &skip);
177 if (ret >= 0)
178 break;
179 ret = read(fileno(infile), inbuf, inbuf_size);
180 if (ret <= 0)
181 return -E_AAC_READ;
182 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
183 }
184 entry = ret;
185 sprintf(info_str, "audio_file_info1:%zu x %lums\n"
186 "audio_file_info2:\n"
187 "audio_file_info3:\n",
188 num_chunks,
189 tv2ms(&af->chunk_tv));
190 tv_scale(20, &af->chunk_tv, &af->eof_tv);
191 return 1;
192 }
193
194 /*
195 * nothing to do as we'll seek to the correct offset in aac read_chunk() anyway
196 */
197 static int aac_reposition_stream(__a_unused long unsigned request)
198 {
199 return 1;
200 }
201
202 static char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
203 {
204 int ret;
205 size_t pos;
206
207 *len = 0;
208 if (current_chunk >= num_chunks)
209 return NULL;
210 if (!current_chunk) {
211 *len = chunk_table[0];
212 pos = entry;
213 } else {
214 *len = chunk_table[current_chunk] - chunk_table[current_chunk - 1];
215 pos = entry + chunk_table[current_chunk - 1];
216 }
217 if (inbuf_size < *len) {
218 inbuf = para_realloc(inbuf, *len);
219 inbuf_size = *len;
220 }
221 // PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
222 // pos, *len);
223 ret = fseek(infile, pos, SEEK_SET);
224 if (ret < 0)
225 return NULL;
226 ret = para_fread(inbuf, *len, 1, infile);
227 if (ret != *len)
228 return NULL;
229 // PARA_DEBUG_LOG("ret: %d, inbuf[0]: %lx - %lx\n", ret, (long unsigned) inbuf[0],
230 // (long unsigned) inbuf[4]);
231 return (char *)inbuf;
232 }
233
234 static const char* aac_suffixes[] = {"m4a", NULL};
235 /** the init function of the aac audio format handler */
236 void aac_afh_init(struct audio_format_handler *p)
237 {
238 af = p;
239 af->reposition_stream = aac_reposition_stream;
240 af->get_file_info = aac_get_file_info,
241 af->read_chunk = aac_read_chunk;
242 af->close_audio_file = aac_close_audio_file;
243 af->get_header_info = NULL;
244 af->suffixes = aac_suffixes;
245 }