e5ee2eef9520ea57631a6b6f112434de87ffee29
[paraslash.git] / aac_afh.c
1 /*
2 * Copyright (C) 2006-2007 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 "vss.h"
28 #include "afh.h"
29 #include "error.h"
30 #include "string.h"
31 #include "aac.h"
32 #include "fd.h"
33
34 /** size of the input buffer, 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 static struct audio_format_handler *af;
42 static size_t num_chunks;
43
44 static size_t *chunk_table;
45 static NeAACDecHandle handle;
46
47 static void aac_close_audio_file(void)
48 {
49 if (!infile)
50 return;
51 fclose(infile);
52 infile = NULL;
53 free(inbuf);
54 inbuf = NULL;
55 free(chunk_table);
56 chunk_table = NULL;
57 }
58
59 static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip)
60 {
61 int i;
62
63 for (i = 0; i + 16 < buflen; i++) {
64 unsigned char *p = buf + i;
65 unsigned sample_count, sample_size;
66
67 if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
68 continue;
69 PARA_INFO_LOG("found stsz@%d\n", i);
70 i += 8;
71 sample_size = aac_read_int32(buf + i);
72 PARA_INFO_LOG("sample size: %d\n", sample_size);
73 i += 4;
74 sample_count = aac_read_int32(buf + i);
75 i += 4;
76 PARA_INFO_LOG("sample count: %d\n", sample_count);
77 *skip = i;
78 return sample_count;
79 }
80 PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
81 return -E_STSZ;
82 }
83
84 static int read_chunk_table(size_t skip)
85 {
86 int ret, i;
87 size_t sum = 0;
88
89 for (;;) {
90 ret = aac_find_stsz(inbuf, inbuf_len, &skip);
91 if (ret >= 0)
92 break;
93 ret = read(fileno(infile), inbuf, inbuf_size);
94 if (ret <= 0)
95 return -E_AAC_READ;
96 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
97 }
98 num_chunks = ret;
99 PARA_INFO_LOG("sz table has %zu entries\n", num_chunks);
100 chunk_table = para_malloc((num_chunks + 1) * sizeof(size_t));
101 for (i = 1; i <= num_chunks; i++) {
102 if (skip + 4 > inbuf_len) {
103 skip = inbuf_len - skip;
104 memmove(inbuf, inbuf + inbuf_len - skip, skip);
105 ret = read(fileno(infile), inbuf + skip, inbuf_size - skip);
106 if (ret <= 0)
107 return -E_AAC_READ;
108 inbuf_len = ret + skip;
109 skip = 0;
110 PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len);
111 }
112 sum += aac_read_int32(inbuf + skip);
113 chunk_table[i] = sum;
114 skip += 4;
115 if (i < 10 || i + 10 > num_chunks)
116 PARA_DEBUG_LOG("offset #%d: %zu\n", i, chunk_table[i]);
117 }
118 return 1;
119 }
120
121 static long unsigned aac_set_chunk_tv(mp4AudioSpecificConfig *mp4ASC)
122 {
123 float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023,
124 ms = 1000.0 * num_chunks * tmp / mp4ASC->samplingFrequency;
125 struct timeval total;
126
127 ms2tv(ms, &total);
128 tv_divide(num_chunks, &total, &af->chunk_tv);
129 PARA_INFO_LOG("%luHz, %fs (%zd x %lums)\n",
130 mp4ASC->samplingFrequency, ms / 1000,
131 num_chunks, tv2ms(&af->chunk_tv));
132 return ms / 1000;
133 }
134
135 /*
136 * Init m4a file and write some tech data to given pointers.
137 */
138 static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
139 int *seconds)
140 {
141 int i, ret, decoder_len;
142 size_t skip;
143 unsigned long rate = 0;
144 unsigned char channels = 0;
145 mp4AudioSpecificConfig mp4ASC;
146
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 chunk_table[0] = ret;
185 for (i = 1; i<= num_chunks; i++)
186 chunk_table[i] += ret;
187 sprintf(info_str, "audio_file_info1:%zu x %lums\n"
188 "audio_file_info2:\n"
189 "audio_file_info3:\n",
190 num_chunks,
191 tv2ms(&af->chunk_tv));
192 tv_scale(20, &af->chunk_tv, &af->eof_tv);
193 return 1;
194 }
195
196 static char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
197 {
198 int ret;
199 size_t pos;
200
201 *len = 0;
202 if (current_chunk >= num_chunks)
203 return NULL;
204 *len = chunk_table[current_chunk + 1] - chunk_table[current_chunk];
205 if (!*len) /* nothing to send for this run */
206 return inbuf;
207 pos = chunk_table[current_chunk];
208 if (inbuf_size < *len) {
209 PARA_INFO_LOG("increasing inbuf for chunk #%lu/%zu to %zd bytes\n",
210 current_chunk, num_chunks, *len);
211 inbuf = para_realloc(inbuf, *len);
212 inbuf_size = *len;
213 }
214 // PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
215 // pos, *len);
216 ret = fseek(infile, pos, SEEK_SET);
217 if (ret < 0)
218 return NULL;
219 ret = para_fread(inbuf, *len, 1, infile);
220 if (ret != *len)
221 return NULL;
222 // PARA_DEBUG_LOG("ret: %d, inbuf[0]: %lx - %lx\n", ret, (long unsigned) inbuf[0],
223 // (long unsigned) inbuf[4]);
224 return (char *)inbuf;
225 }
226
227
228 static const char* aac_suffixes[] = {"m4a", "mp4", NULL};
229 /** the init function of the aac audio format handler */
230 void aac_afh_init(struct audio_format_handler *p)
231 {
232 af = p;
233 af->get_file_info = aac_get_file_info,
234 af->read_chunk = aac_read_chunk;
235 af->close_audio_file = aac_close_audio_file;
236 af->get_header_info = NULL;
237 af->suffixes = aac_suffixes;
238 }