2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
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.
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.
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.
19 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
23 /** \file aac_afh.c para_server's aac audio format handler */
25 #include "server.cmdline.h"
34 /* must be big enough to hold header */
35 #define DEFAULT_INBUF_SIZE 65536
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;
45 static size_t *chunk_table;
46 NeAACDecHandle handle;
48 static void aac_close_audio_file(void)
56 static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip)
60 for (i = 0; i + 16 < buflen; i++) {
61 unsigned char *p = buf + i;
62 unsigned sample_count, sample_size;
64 if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
66 PARA_INFO_LOG("found stsz@%d\n", i);
68 sample_size = aac_read_int32(buf + i);
69 PARA_INFO_LOG("sample size: %d\n", sample_size);
71 sample_count = aac_read_int32(buf + i);
73 PARA_INFO_LOG("sample count: %d\n", sample_count);
77 PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
81 static int read_chunk_table(size_t skip)
87 ret = aac_find_stsz(inbuf, inbuf_len, &skip);
90 ret = read(fileno(infile), inbuf, inbuf_size);
93 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
96 PARA_INFO_LOG("sz table has %zu entries\n", num_chunks);
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);
106 inbuf_len = ret + skip;
108 PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len);
110 sum += aac_read_int32(inbuf + skip);
111 chunk_table[i] = sum;
113 if (i < 10 || i + 10 > num_chunks)
114 PARA_DEBUG_LOG("offset #%d: %zu\n", i, chunk_table[i]);
119 long unsigned aac_set_chunk_tv(mp4AudioSpecificConfig *mp4ASC)
121 float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023,
122 ms = 1000.0 * num_chunks * tmp / mp4ASC->samplingFrequency;
123 struct timeval 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));
134 * Init m4a file and write some tech data to given pointers.
136 static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
139 int ret, decoder_len;
141 unsigned long rate = 0;
142 unsigned char channels = 0;
143 mp4AudioSpecificConfig mp4ASC;
146 inbuf_size = DEFAULT_INBUF_SIZE;
147 inbuf = para_malloc(inbuf_size);
150 ret = read(fileno(infile), inbuf, inbuf_size);
154 ret = aac_find_esds(inbuf, inbuf_len, &skip);
159 ret = NeAACDecInit(handle, inbuf + skip,
160 decoder_len, &rate, &channels);
162 return -E_AACDEC_INIT;
164 PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
165 ret = NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip,
169 ret = read_chunk_table(skip);
172 *frames = num_chunks;
173 *seconds = aac_set_chunk_tv(&mp4ASC);
175 ret = aac_find_entry_point(inbuf, inbuf_len, &skip);
178 ret = read(fileno(infile), inbuf, inbuf_size);
181 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
184 sprintf(info_str, "audio_file_info1:%zu x %lums\n"
185 "audio_file_info2:\n"
186 "audio_file_info3:\n",
188 tv2ms(&af->chunk_tv));
189 tv_scale(20, &af->chunk_tv, &af->eof_tv);
194 * nothing to do as we'll seek to the correct offset in aac read_chunk() anyway
196 static int aac_reposition_stream(__a_unused long unsigned request)
201 static char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
207 if (current_chunk >= num_chunks)
209 if (!current_chunk) {
210 *len = chunk_table[0];
213 *len = chunk_table[current_chunk] - chunk_table[current_chunk - 1];
214 pos = entry + chunk_table[current_chunk - 1];
216 if (inbuf_size < *len) {
217 inbuf = para_realloc(inbuf, *len);
220 // PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
222 ret = fseek(infile, pos, SEEK_SET);
225 ret = para_fread(inbuf, *len, 1, infile);
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;
233 static const char* aac_suffixes[] = {"m4a", "mp4", NULL};
234 /** the init function of the aac audio format handler */
235 void aac_afh_init(struct audio_format_handler *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 af->suffixes = aac_suffixes;