Obtain afs status items directly from afs.
[paraslash.git] / aac_afh.c
1 /*
2 * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6 /*
7 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
8 * Ahead Software AG
9 */
10
11 /** \file aac_afh.c para_server's aac audio format handler */
12
13 #include <osl.h>
14 #include "para.h"
15 #include "error.h"
16 #include "string.h"
17 #include "afh.h"
18 #include "afs.h"
19 #include "server.h"
20 #include "aac.h"
21
22 static int aac_find_stsz(unsigned char *buf, size_t buflen, off_t *skip)
23 {
24 int i;
25
26 for (i = 0; i + 16 < buflen; i++) {
27 unsigned char *p = buf + i;
28 unsigned sample_count, sample_size;
29
30 if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
31 continue;
32 PARA_DEBUG_LOG("found stsz@%d\n", i);
33 i += 8;
34 sample_size = aac_read_int32(buf + i);
35 PARA_DEBUG_LOG("sample size: %d\n", sample_size);
36 i += 4;
37 sample_count = aac_read_int32(buf + i);
38 i += 4;
39 PARA_DEBUG_LOG("sample count: %d\n", sample_count);
40 *skip = i;
41 return sample_count;
42 }
43 return -E_STSZ;
44 }
45
46 static int atom_cmp(unsigned char *buf1, char *buf2)
47 {
48 unsigned char *b2 = (unsigned char *)buf2;
49
50 if (buf1[0] != b2[0])
51 return 1;
52 if (buf1[1] != b2[1])
53 return 1;
54 if (buf1[2] != b2[2])
55 return 1;
56 if (buf1[3] != b2[3])
57 return 1;
58 return 0;
59 }
60
61 static int read_atom_header(unsigned char *buf, uint64_t *subsize, unsigned char type[5])
62 {
63 int i;
64 uint64_t size = (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3];
65
66 memcpy(type, buf + 4, 4);
67 type[4] = '\0';
68
69 PARA_DEBUG_LOG("size: %llu, type: %s\n", (long long unsigned)size, type);
70 if (size != 1) {
71 *subsize = size;
72 return 8;
73 }
74 buf += 4;
75 size = 0;
76 for (i = 0; i < 8; i++)
77 size |= ((uint64_t)buf[i]) << ((7 - i) * 8);
78 *subsize = size;
79 return 16;
80 }
81
82 static char *get_tag(unsigned char *p, int size)
83 {
84 char *buf;
85
86 assert(size > 0);
87 buf = para_malloc(size + 1);
88
89 memcpy(buf, p, size);
90 buf[size] = '\0';
91 PARA_DEBUG_LOG("size: %d: %s\n", size, buf);
92 return buf;
93 }
94
95 static void read_tags(unsigned char *buf, size_t buflen, struct afh_info *afhi)
96 {
97 unsigned char *p = buf;
98
99 while (p + 32 < buf + buflen) {
100 unsigned char *q, type1[5], type2[5];
101 uint64_t size1, size2;
102 int ret, ret2;
103
104 ret = read_atom_header(p, &size1, type1);
105 ret2 = read_atom_header(p + ret, &size2, type2);
106
107 if (size2 <= 16 || atom_cmp(type2, "data")) {
108 p += size1;
109 continue;
110 }
111 size2 -= 16;
112 q = p + ret + ret2 + 8;
113 if (q + size2 > buf + buflen)
114 break;
115 if (!atom_cmp(type1, "©ART"))
116 afhi->tags.artist = get_tag(q, size2);
117 else if (!atom_cmp(type1, "©alb"))
118 afhi->tags.album = get_tag(q, size2);
119 else if (!atom_cmp(type1, "©nam"))
120 afhi->tags.title = get_tag(q, size2);
121 else if (!atom_cmp(type1, "©cmt"))
122 afhi->tags.comment = get_tag(q, size2);
123 else if (!atom_cmp(type1, "©day"))
124 afhi->tags.year = get_tag(q, size2);
125 p += size1;
126 }
127 }
128
129 static void read_meta(unsigned char *buf, size_t buflen, struct afh_info *afhi)
130 {
131 unsigned char *p = buf;
132
133 while (p + 4 < buf + buflen) {
134
135 if (p[0] != 'i' || p[1] != 'l' || p[2] != 's' || p[3] != 't') {
136 p++;
137 continue;
138 }
139 p += 4;
140 return read_tags(p, buflen - (p - buf), afhi);
141 }
142 }
143
144 static void aac_get_taginfo(unsigned char *buf, size_t buflen,
145 struct afh_info *afhi)
146 {
147 int i;
148 uint64_t subsize;
149 unsigned char type[5];
150
151 for (i = 0; i + 24 < buflen; i++) {
152 unsigned char *p = buf + i;
153 if (p[0] != 'm' || p[1] != 'e' || p[2] != 't' || p[3] != 'a')
154 continue;
155 PARA_INFO_LOG("found metadata at offset %d\n", i);
156 i += 8;
157 p = buf + i;
158 i += read_atom_header(p, &subsize, type);
159 p = buf + i;
160 return read_meta(p, buflen - i, afhi);
161 }
162 PARA_INFO_LOG("no meta data\n");
163 }
164
165 static ssize_t aac_compute_chunk_table(struct afh_info *afhi,
166 unsigned char *map, size_t numbytes)
167 {
168 int ret, i;
169 size_t sum = 0;
170 off_t skip;
171
172 ret = aac_find_stsz(map, numbytes, &skip);
173 if (ret < 0)
174 return ret;
175 afhi->chunks_total = ret;
176 PARA_DEBUG_LOG("sz table has %lu entries\n", afhi->chunks_total);
177 afhi->chunk_table = para_malloc((afhi->chunks_total + 1) * sizeof(size_t));
178 for (i = 1; i <= afhi->chunks_total; i++) {
179 if (skip + 4 > numbytes)
180 break;
181 sum += aac_read_int32(map + skip);
182 afhi->chunk_table[i] = sum;
183 skip += 4;
184 // if (i < 10 || i + 10 > afhi->chunks_total)
185 // PARA_DEBUG_LOG("offset #%d: %zu\n", i, afhi->chunk_table[i]);
186 }
187 return skip;
188 }
189
190 static int aac_set_chunk_tv(struct afh_info *afhi,
191 mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds)
192 {
193 float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023;
194 struct timeval total;
195 long unsigned ms = 1000.0 * afhi->chunks_total * tmp
196 / mp4ASC->samplingFrequency;
197
198 if (!mp4ASC->samplingFrequency)
199 return -E_MP4ASC;
200 ms = 1000.0 * afhi->chunks_total * tmp / mp4ASC->samplingFrequency;
201 ms2tv(ms, &total);
202 tv_divide(afhi->chunks_total, &total, &afhi->chunk_tv);
203 PARA_INFO_LOG("%luHz, %lus (%lu x %lums)\n",
204 mp4ASC->samplingFrequency, ms / 1000,
205 afhi->chunks_total, tv2ms(&afhi->chunk_tv));
206 if (ms < 1000)
207 return -E_MP4ASC;
208 *seconds = ms / 1000;
209 return 1;
210 }
211
212 /*
213 * Init m4a file and write some tech data to given pointers.
214 */
215 static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
216 struct afh_info *afhi)
217 {
218 int i;
219 size_t skip;
220 ssize_t ret;
221 unsigned long rate = 0, decoder_len;
222 unsigned char channels = 0;
223 mp4AudioSpecificConfig mp4ASC;
224 NeAACDecHandle handle = NULL;
225 unsigned char *umap = (unsigned char *) map;
226
227 ret = aac_find_esds(umap, numbytes, &skip, &decoder_len);
228 if (ret < 0)
229 goto out;
230 aac_get_taginfo(umap, numbytes, afhi);
231 handle = aac_open();
232 ret = -E_AAC_AFH_INIT;
233 if (NeAACDecInit(handle, umap + skip, decoder_len, &rate, &channels))
234 goto out;
235 if (!channels)
236 goto out;
237 PARA_DEBUG_LOG("rate: %lu, channels: %d\n", rate, channels);
238 ret = -E_MP4ASC;
239 if (NeAACDecAudioSpecificConfig(umap + skip, numbytes - skip, &mp4ASC))
240 goto out;
241 if (!mp4ASC.samplingFrequency)
242 goto out;
243 ret = aac_compute_chunk_table(afhi, umap, numbytes);
244 if (ret < 0)
245 goto out;
246 skip = ret;
247 ret = aac_set_chunk_tv(afhi, &mp4ASC, &afhi->seconds_total);
248 if (ret < 0)
249 goto out;
250 ret = aac_find_entry_point(umap + skip, numbytes - skip, &skip);
251 if (ret < 0)
252 goto out;
253 afhi->chunk_table[0] = ret;
254 for (i = 1; i<= afhi->chunks_total; i++)
255 afhi->chunk_table[i] += ret;
256 afhi->channels = channels;
257 afhi->frequency = rate;
258 ret = (afhi->chunk_table[afhi->chunks_total] - afhi->chunk_table[0]) * 8; /* bits */
259 ret += (channels * afhi->seconds_total * 500); /* avoid rounding error */
260 afhi->bitrate = ret / (channels * afhi->seconds_total * 1000);
261 ret = 1;
262 out:
263 if (handle)
264 NeAACDecClose(handle);
265 return ret;
266 }
267
268 static const char* aac_suffixes[] = {"m4a", "mp4", NULL};
269 /**
270 * the init function of the aac audio format handler
271 *
272 * \param afh pointer to the struct to initialize
273 */
274 void aac_afh_init(struct audio_format_handler *afh)
275 {
276 afh->get_file_info = aac_get_file_info,
277 afh->suffixes = aac_suffixes;
278 }