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.
18 /** \file aac_afh.c para_server's aac audio format handler */
21 #include "server.cmdline.h"
28 /* must be big enough to hold header */
29 #define DEFAULT_INBUF_SIZE 65536
32 static int inbuf_size;
33 static unsigned char *inbuf;
34 static unsigned inbuf_len;
35 struct audio_format *af;
37 static unsigned num_chunks, entry;
39 static size_t *chunk_table;
40 NeAACDecHandle handle;
43 static void aac_close_audio_file(void)
47 static int aac_find_stsz(unsigned char *buf, unsigned buflen, unsigned *skip)
51 for (i = 0; i + 16 < buflen; i++) {
52 unsigned char *p = buf + i;
53 unsigned sample_count, sample_size;
55 if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
57 PARA_INFO_LOG("found stsz@%d\n", i);
59 sample_size = aac_read_int32(buf + i);
60 PARA_INFO_LOG("sample size: %d\n", sample_size);
62 sample_count = aac_read_int32(buf + i);
64 PARA_INFO_LOG("sample count: %d\n", sample_count);
68 PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
73 static int read_stsz(unsigned skip)
76 long unsigned sum = 0;
79 ret = aac_find_stsz(inbuf, inbuf_len, &skip);
82 ret = read(fileno(infile), inbuf, inbuf_size);
85 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
88 PARA_INFO_LOG("sz table has %d entries\n", num_chunks);
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);
98 inbuf_len = ret + skip;
100 PARA_INFO_LOG("next buffer: %d bytes\n", inbuf_len);
102 sum += aac_read_int32(inbuf + skip);
103 chunk_table[i] = sum;
105 if (i < 10 || i > num_chunks - 10)
106 PARA_DEBUG_LOG("offset #%d: %d\n", i, chunk_table[i]);
114 * Init m4a file and write some tech data to given pointers.
116 static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
119 int ret, skip, decoder_len;
120 unsigned long rate = 0;
121 unsigned char channels = 0;
122 mp4AudioSpecificConfig mp4ASC;
125 inbuf_size = DEFAULT_INBUF_SIZE;
126 inbuf = para_malloc(inbuf_size);
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);
134 PARA_INFO_LOG("checking aac %d bytes\n", ret);
136 ret = aac_find_esds(inbuf, inbuf_len, &skip);
141 ret = NeAACDecInit(handle, inbuf + skip,
142 decoder_len, &rate, &channels);
144 return -E_AACDEC_INIT;
146 PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
147 ret = NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip, &mp4ASC);
149 PARA_DEBUG_LOG("mp4ASC.samplingFrequency: %lu\n",
150 mp4ASC.samplingFrequency);
152 PARA_WARNING_LOG("no mp4ASC %s\n", "");
154 ret = read_stsz(skip);
157 *frames = num_chunks;
159 ret = aac_find_entry(inbuf, inbuf_len, &skip);
162 ret = read(fileno(infile), inbuf, inbuf_size);
165 PARA_INFO_LOG("next buffer: %d bytes\n", ret);
168 PARA_INFO_LOG("offset table has %d entries\, entry: %zd\n", num_chunks,
171 sprintf(info_str, "audio_file_info1:%d x %lums\n"
172 "audio_file_info2:\n"
173 "audio_file_info3:\n",
175 tv2ms(&af->chunk_tv));
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);
189 * Simple stream reposition routine
191 static int aac_reposition_stream(long unsigned request)
196 static __must_check int para_fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
198 size_t res = fread(ptr, size, nmemb, stream);
206 char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
212 if (current_chunk >= num_chunks)
214 if (!current_chunk) {
217 } else if (current_chunk == 1) {
218 *len = chunk_table[0];
221 *len = chunk_table[current_chunk - 1] - chunk_table[current_chunk - 2];
222 pos = entry + chunk_table[current_chunk - 2];
224 if (inbuf_size < *len) {
225 inbuf = para_realloc(inbuf, *len);
228 // PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
230 ret = fseek(infile, pos, SEEK_SET);
233 ret = para_fread(inbuf, *len, 1, infile);
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;
241 void aac_afh_init(void *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);