aac: move aac_find_stsz from aac_common.c to to aac_afh.c
[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 /** \file aac_afh.c para_server's aac audio format handler */
19
20
21 #include "server.cmdline.h"
22 #include "server.h"
23 #include "afs.h"
24 #include "error.h"
25 #include "string.h"
26 #include "aac.h"
27
28 /* must be big enough to hold header */
29 #define DEFAULT_INBUF_SIZE 65536
30
31 static FILE *infile;
32 static int inbuf_size;
33 static unsigned char *inbuf;
34 static unsigned inbuf_len;
35 struct audio_format *af;
36
37 static unsigned num_chunks, entry;
38
39 static size_t *chunk_table;
40 NeAACDecHandle handle;
41
42
43 static void aac_close_audio_file(void)
44 {
45 }
46
47 static int aac_find_stsz(unsigned char *buf, unsigned buflen, unsigned *skip)
48 {
49 int i;
50
51 for (i = 0; i + 16 < buflen; i++) {
52 unsigned char *p = buf + i;
53 unsigned sample_count, sample_size;
54
55 if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
56 continue;
57 PARA_INFO_LOG("found stsz@%d\n", i);
58 i += 8;
59 sample_size = aac_read_int32(buf + i);
60 PARA_INFO_LOG("sample size: %d\n", sample_size);
61 i += 4;
62 sample_count = aac_read_int32(buf + i);
63 i += 4;
64 PARA_INFO_LOG("sample count: %d\n", sample_count);
65 *skip = i;
66 return sample_count;
67 }
68 PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
69 return -E_STCO;
70 }
71
72
73 static int read_stsz(unsigned skip)
74 {
75 int ret, i;
76 long unsigned sum = 0;
77
78 for (;;) {
79 ret = aac_find_stsz(inbuf, inbuf_len, &skip);
80 if (ret >= 0)
81 break;
82 ret = read(fileno(infile), inbuf, inbuf_size);
83 if (ret <= 0)
84 return -E_AAC_READ;
85 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
86 }
87 num_chunks = ret;
88 PARA_INFO_LOG("sz table has %d entries\n", num_chunks);
89 free(chunk_table);
90 chunk_table = para_malloc(num_chunks * sizeof(size_t));
91 for (i = 0; i < num_chunks; i++) {
92 if (skip + 4 > inbuf_len) {
93 skip = inbuf_len - skip;
94 memmove(inbuf, inbuf + inbuf_len - skip, skip);
95 ret = read(fileno(infile), inbuf + skip, inbuf_size - skip);
96 if (ret <= 0)
97 return -E_AAC_READ;
98 inbuf_len = ret + skip;
99 skip = 0;
100 PARA_INFO_LOG("next buffer: %d bytes\n", inbuf_len);
101 }
102 sum += aac_read_int32(inbuf + skip);
103 chunk_table[i] = sum;
104 skip += 4;
105 if (i < 10 || i > num_chunks - 10)
106 PARA_DEBUG_LOG("offset #%d: %d\n", i, chunk_table[i]);
107 }
108 return 1;
109
110 }
111
112
113 /*
114 * Init m4a file and write some tech data to given pointers.
115 */
116 static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
117 int *seconds)
118 {
119 int ret, skip, decoder_len;
120 unsigned long rate = 0;
121 unsigned char channels = 0;
122 mp4AudioSpecificConfig mp4ASC;
123
124 free(inbuf);
125 inbuf_size = DEFAULT_INBUF_SIZE;
126 inbuf = para_malloc(inbuf_size);
127 infile = file;
128
129 PARA_INFO_LOG("file: %p\n", file);
130 ret = read(fileno(infile), inbuf, inbuf_size);
131 PARA_INFO_LOG("read %d bytes\n", ret);
132 if (ret <= 0)
133 return -E_AAC_READ;
134 PARA_INFO_LOG("checking aac %d bytes\n", ret);
135 inbuf_len = ret;
136 ret = aac_find_esds(inbuf, inbuf_len, &skip);
137 if (ret < 0)
138 return ret;
139 decoder_len = ret;
140 handle = aac_open();
141 ret = NeAACDecInit(handle, inbuf + skip,
142 decoder_len, &rate, &channels);
143 if (ret < 0)
144 return -E_AACDEC_INIT;
145 skip += ret;
146 PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
147 ret = NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip, &mp4ASC);
148 if (ret >= 0) {
149 PARA_DEBUG_LOG("mp4ASC.samplingFrequency: %lu\n",
150 mp4ASC.samplingFrequency);
151 } else
152 PARA_WARNING_LOG("no mp4ASC %s\n", "");
153
154 ret = read_stsz(skip);
155 if (ret < 0)
156 return ret;
157 *frames = num_chunks;
158 for (;;) {
159 ret = aac_find_entry(inbuf, inbuf_len, &skip);
160 if (ret >= 0)
161 break;
162 ret = read(fileno(infile), inbuf, inbuf_size);
163 if (ret <= 0)
164 return -E_AAC_READ;
165 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
166 }
167 entry = ret;
168 PARA_INFO_LOG("offset table has %d entries\, entry: %zd\n", num_chunks,
169 entry);
170 #if 1
171 sprintf(info_str, "audio_file_info1:%d x %lums\n"
172 "audio_file_info2:\n"
173 "audio_file_info3:\n",
174 num_chunks,
175 tv2ms(&af->chunk_tv));
176 #endif
177 #if 1
178 {
179 struct timeval total_tv;
180 tv_scale(num_chunks, &af->chunk_tv, &total_tv);
181 *seconds = tv2ms(&total_tv) / 1000;
182 PARA_INFO_LOG("%d seconds, %d chunks\n", *seconds, num_chunks);
183 }
184 #endif
185 return 1;
186 }
187
188 /*
189 * Simple stream reposition routine
190 */
191 static int aac_reposition_stream(long unsigned request)
192 {
193 return -E_AAC_REPOS;
194 }
195
196 static __must_check int para_fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
197 {
198 size_t res = fread(ptr, size, nmemb, stream);
199 if (res == nmemb)
200 return size * nmemb;
201 if (feof(stream))
202 return 0;
203 return -E_FREAD;
204 }
205
206 char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
207 {
208 int ret;
209 size_t pos;
210
211 *len = 0;
212 if (current_chunk >= num_chunks)
213 return NULL;
214 if (!current_chunk) {
215 *len = entry;
216 pos = 0;
217 } else if (current_chunk == 1) {
218 *len = chunk_table[0];
219 pos = entry;
220 } else {
221 *len = chunk_table[current_chunk - 1] - chunk_table[current_chunk - 2];
222 pos = entry + chunk_table[current_chunk - 2];
223 }
224 if (inbuf_size < *len) {
225 inbuf = para_realloc(inbuf, *len);
226 inbuf_size = *len;
227 }
228 // PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
229 // pos, *len);
230 ret = fseek(infile, pos, SEEK_SET);
231 if (ret < 0)
232 return NULL;
233 ret = para_fread(inbuf, *len, 1, infile);
234 if (ret != *len)
235 return NULL;
236 // PARA_DEBUG_LOG("ret: %d, inbuf[0]: %lx - %lx\n", ret, (long unsigned) inbuf[0],
237 // (long unsigned) inbuf[4]);
238 return (char *)inbuf;
239 }
240
241 void aac_afh_init(void *p)
242 {
243 af = p;
244 af->reposition_stream = aac_reposition_stream;
245 af->get_file_info = aac_get_file_info,
246 af->read_chunk = aac_read_chunk;
247 af->close_audio_file = aac_close_audio_file;
248 af->get_header_info = NULL;
249 af->chunk_tv.tv_sec = 0;
250 af->chunk_tv.tv_usec = 23120;
251 tv_scale(3, &af->chunk_tv, &af->eof_tv);
252 }