601621ed8c99ff22b72b89af3c11f810dd58936c
[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 "error.h"
29 #include "string.h"
30 #include "aac.h"
31 #include "fd.h"
32
33 /* must be big enough to hold header */
34 #define DEFAULT_INBUF_SIZE 65536
35
36 static FILE *infile;
37 static int inbuf_size;
38 static unsigned char *inbuf;
39 static size_t inbuf_len;
40 struct audio_format_handler *af;
41 static size_t num_chunks;
42 static size_t entry;
43
44 static size_t *chunk_table;
45 NeAACDecHandle handle;
46
47 static void aac_close_audio_file(void)
48 {
49 if (!infile)
50 return;
51 fclose(infile);
52 infile = NULL;
53 }
54
55 static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip)
56 {
57 int i;
58
59 for (i = 0; i + 16 < buflen; i++) {
60 unsigned char *p = buf + i;
61 unsigned sample_count, sample_size;
62
63 if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
64 continue;
65 PARA_INFO_LOG("found stsz@%d\n", i);
66 i += 8;
67 sample_size = aac_read_int32(buf + i);
68 PARA_INFO_LOG("sample size: %d\n", sample_size);
69 i += 4;
70 sample_count = aac_read_int32(buf + i);
71 i += 4;
72 PARA_INFO_LOG("sample count: %d\n", sample_count);
73 *skip = i;
74 return sample_count;
75 }
76 PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
77 return -E_STSZ;
78 }
79
80 static int read_chunk_table(size_t skip)
81 {
82 int ret, i;
83 size_t sum = 0;
84
85 for (;;) {
86 ret = aac_find_stsz(inbuf, inbuf_len, &skip);
87 if (ret >= 0)
88 break;
89 ret = read(fileno(infile), inbuf, inbuf_size);
90 if (ret <= 0)
91 return -E_AAC_READ;
92 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
93 }
94 num_chunks = ret;
95 PARA_INFO_LOG("sz table has %zu entries\n", num_chunks);
96 free(chunk_table);
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);
103 if (ret <= 0)
104 return -E_AAC_READ;
105 inbuf_len = ret + skip;
106 skip = 0;
107 PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len);
108 }
109 sum += aac_read_int32(inbuf + skip);
110 chunk_table[i] = sum;
111 skip += 4;
112 if (i < 10 || i + 10 > num_chunks)
113 PARA_DEBUG_LOG("offset #%d: %zu\n", i, chunk_table[i]);
114 }
115 return 1;
116
117 }
118
119 long unsigned aac_set_chunk_tv(mp4AudioSpecificConfig *mp4ASC)
120 {
121 float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023,
122 ms = 1000.0 * num_chunks * tmp / mp4ASC->samplingFrequency;
123 struct timeval total;
124
125 ms2tv(ms, &total);
126 tv_divide(num_chunks, &total, &af->chunk_tv);
127 PARA_INFO_LOG("%luHz, %fs (%zd x %lums)\n",
128 mp4ASC->samplingFrequency, ms / 1000,
129 num_chunks, tv2ms(&af->chunk_tv));
130 return ms / 1000;
131 }
132
133 /*
134 * Init m4a file and write some tech data to given pointers.
135 */
136 static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
137 int *seconds)
138 {
139 int ret, decoder_len;
140 size_t skip;
141 unsigned long rate = 0;
142 unsigned char channels = 0;
143 mp4AudioSpecificConfig mp4ASC;
144
145 free(inbuf);
146 inbuf_size = DEFAULT_INBUF_SIZE;
147 inbuf = para_malloc(inbuf_size);
148 infile = file;
149
150 ret = read(fileno(infile), inbuf, inbuf_size);
151 if (ret <= 0)
152 return -E_AAC_READ;
153 inbuf_len = ret;
154 ret = aac_find_esds(inbuf, inbuf_len, &skip);
155 if (ret < 0)
156 return ret;
157 decoder_len = ret;
158 handle = aac_open();
159 ret = NeAACDecInit(handle, inbuf + skip,
160 decoder_len, &rate, &channels);
161 if (ret < 0)
162 return -E_AACDEC_INIT;
163 skip += ret;
164 PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
165 ret = NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip,
166 &mp4ASC);
167 if (ret < 0)
168 return -E_MP4ASC;
169 ret = read_chunk_table(skip);
170 if (ret < 0)
171 return ret;
172 *frames = num_chunks;
173 *seconds = aac_set_chunk_tv(&mp4ASC);
174 for (;;) {
175 ret = aac_find_entry_point(inbuf, inbuf_len, &skip);
176 if (ret >= 0)
177 break;
178 ret = read(fileno(infile), inbuf, inbuf_size);
179 if (ret <= 0)
180 return -E_AAC_READ;
181 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
182 }
183 entry = ret;
184 sprintf(info_str, "audio_file_info1:%zu x %lums\n"
185 "audio_file_info2:\n"
186 "audio_file_info3:\n",
187 num_chunks,
188 tv2ms(&af->chunk_tv));
189 return 1;
190 }
191
192 /*
193 * Simple stream reposition routine
194 */
195 static int aac_reposition_stream(long unsigned request)
196 {
197 return 1;
198 // return -E_AAC_REPOS;
199 }
200
201 static char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
202 {
203 int ret;
204 size_t pos;
205
206 *len = 0;
207 if (current_chunk >= num_chunks)
208 return NULL;
209 if (!current_chunk) {
210 *len = chunk_table[0];
211 pos = entry;
212 } else {
213 *len = chunk_table[current_chunk] - chunk_table[current_chunk - 1];
214 pos = entry + chunk_table[current_chunk - 1];
215 }
216 if (inbuf_size < *len) {
217 inbuf = para_realloc(inbuf, *len);
218 inbuf_size = *len;
219 }
220 // PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
221 // pos, *len);
222 ret = fseek(infile, pos, SEEK_SET);
223 if (ret < 0)
224 return NULL;
225 ret = para_fread(inbuf, *len, 1, infile);
226 if (ret != *len)
227 return NULL;
228 // PARA_DEBUG_LOG("ret: %d, inbuf[0]: %lx - %lx\n", ret, (long unsigned) inbuf[0],
229 // (long unsigned) inbuf[4]);
230 return (char *)inbuf;
231 }
232
233 static const char* aac_suffixes[] = {"m4a", NULL};
234 /** the init function of the aac audio format handler */
235 void aac_afh_init(struct audio_format_handler *p)
236 {
237 af = p;
238 af->reposition_stream = aac_reposition_stream;
239 af->get_file_info = aac_get_file_info,
240 af->read_chunk = aac_read_chunk;
241 af->close_audio_file = aac_close_audio_file;
242 af->get_header_info = NULL;
243 tv_scale(3, &af->chunk_tv, &af->eof_tv);
244 af->suffixes = aac_suffixes;
245 }