/*
- * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*/
-/** \file aac_afh.c para_server's aac audio format handler */
+/*
+ * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
+ * Ahead Software AG
+ */
+/** \file aac_afh.c para_server's aac audio format handler */
#include "server.cmdline.h"
#include "server.h"
-#include "afs.h"
+#include "vss.h"
+#include "afh.h"
#include "error.h"
#include "string.h"
#include "aac.h"
+#include "fd.h"
-/* must be big enough to hold header */
+/** size of the input buffer, must be big enough to hold header */
#define DEFAULT_INBUF_SIZE 65536
static FILE *infile;
static int inbuf_size;
static unsigned char *inbuf;
-static ssize_t *chunk_table;
-struct audio_format *af;
+static size_t inbuf_len;
+static struct audio_format_handler *af;
+static size_t num_chunks;
+static size_t entry;
-unsigned num_chunks, chunk_num;
+static size_t *chunk_table;
+static NeAACDecHandle handle;
-NeAACDecHandle handle;
static void aac_close_audio_file(void)
{
+ if (!infile)
+ return;
+ fclose(infile);
+ infile = NULL;
+}
+
+static int aac_find_stsz(unsigned char *buf, unsigned buflen, size_t *skip)
+{
+ int i;
+
+ for (i = 0; i + 16 < buflen; i++) {
+ unsigned char *p = buf + i;
+ unsigned sample_count, sample_size;
+
+ if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
+ continue;
+ PARA_INFO_LOG("found stsz@%d\n", i);
+ i += 8;
+ sample_size = aac_read_int32(buf + i);
+ PARA_INFO_LOG("sample size: %d\n", sample_size);
+ i += 4;
+ sample_count = aac_read_int32(buf + i);
+ i += 4;
+ PARA_INFO_LOG("sample count: %d\n", sample_count);
+ *skip = i;
+ return sample_count;
+ }
+ PARA_WARNING_LOG("stsz not found, buflen: %d\n", buflen);
+ return -E_STSZ;
+}
+
+static int read_chunk_table(size_t skip)
+{
+ int ret, i;
+ size_t sum = 0;
+
+ for (;;) {
+ ret = aac_find_stsz(inbuf, inbuf_len, &skip);
+ if (ret >= 0)
+ break;
+ ret = read(fileno(infile), inbuf, inbuf_size);
+ if (ret <= 0)
+ return -E_AAC_READ;
+ PARA_INFO_LOG("next buffer: %d bytes\n", ret);
+ }
+ num_chunks = ret;
+ PARA_INFO_LOG("sz table has %zu entries\n", num_chunks);
+ free(chunk_table);
+ chunk_table = para_malloc(num_chunks * sizeof(size_t));
+ for (i = 0; i < num_chunks; i++) {
+ if (skip + 4 > inbuf_len) {
+ skip = inbuf_len - skip;
+ memmove(inbuf, inbuf + inbuf_len - skip, skip);
+ ret = read(fileno(infile), inbuf + skip, inbuf_size - skip);
+ if (ret <= 0)
+ return -E_AAC_READ;
+ inbuf_len = ret + skip;
+ skip = 0;
+ PARA_INFO_LOG("next buffer: %zu bytes\n", inbuf_len);
+ }
+ sum += aac_read_int32(inbuf + skip);
+ chunk_table[i] = sum;
+ skip += 4;
+ if (i < 10 || i + 10 > num_chunks)
+ PARA_DEBUG_LOG("offset #%d: %zu\n", i, chunk_table[i]);
+ }
+ return 1;
+}
+
+static long unsigned aac_set_chunk_tv(mp4AudioSpecificConfig *mp4ASC)
+{
+ float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023,
+ ms = 1000.0 * num_chunks * tmp / mp4ASC->samplingFrequency;
+ struct timeval total;
+
+ ms2tv(ms, &total);
+ tv_divide(num_chunks, &total, &af->chunk_tv);
+ PARA_INFO_LOG("%luHz, %fs (%zd x %lums)\n",
+ mp4ASC->samplingFrequency, ms / 1000,
+ num_chunks, tv2ms(&af->chunk_tv));
+ return ms / 1000;
}
/*
static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
int *seconds)
{
- int ret, skip, decoder_len;
- unsigned inbuf_len;
+ int ret, decoder_len;
+ size_t skip;
unsigned long rate = 0;
unsigned char channels = 0;
+ mp4AudioSpecificConfig mp4ASC;
free(inbuf);
inbuf_size = DEFAULT_INBUF_SIZE;
inbuf = para_malloc(inbuf_size);
infile = file;
- PARA_INFO_LOG("file: %p\n", file);
ret = read(fileno(infile), inbuf, inbuf_size);
- PARA_INFO_LOG("read %d bytes\n", ret);
if (ret <= 0)
return -E_AAC_READ;
- PARA_INFO_LOG("checking aac %d bytes\n", ret);
inbuf_len = ret;
ret = aac_find_esds(inbuf, inbuf_len, &skip);
if (ret < 0)
decoder_len = ret;
handle = aac_open();
ret = NeAACDecInit(handle, inbuf + skip,
- inbuf_len - skip, &rate, &channels);
+ decoder_len, &rate, &channels);
+ if (ret < 0)
+ return -E_AACDEC_INIT;
+ skip += ret;
PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
-
+ ret = NeAACDecAudioSpecificConfig(inbuf + skip, inbuf_len - skip,
+ &mp4ASC);
+ if (ret < 0)
+ return -E_MP4ASC;
+ ret = read_chunk_table(skip);
+ if (ret < 0)
+ return ret;
+ *frames = num_chunks;
+ *seconds = aac_set_chunk_tv(&mp4ASC);
+ for (;;) {
+ ret = aac_find_entry_point(inbuf, inbuf_len, &skip);
+ if (ret >= 0)
+ break;
+ ret = read(fileno(infile), inbuf, inbuf_size);
+ if (ret <= 0)
+ return -E_AAC_READ;
+ PARA_INFO_LOG("next buffer: %d bytes\n", ret);
+ }
+ entry = ret;
+ sprintf(info_str, "audio_file_info1:%zu x %lums\n"
+ "audio_file_info2:\n"
+ "audio_file_info3:\n",
+ num_chunks,
+ tv2ms(&af->chunk_tv));
+ tv_scale(20, &af->chunk_tv, &af->eof_tv);
return 1;
}
/*
- * Simple stream reposition routine
+ * nothing to do as we'll seek to the correct offset in aac read_chunk() anyway
*/
-static int aac_reposition_stream(long unsigned request)
+static int aac_reposition_stream(__a_unused long unsigned request)
{
- return -E_AAC_REPOS;
+ return 1;
}
-static int get_chunk_size(long unsigned chunk_num)
+static char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
{
int ret;
- if (chunk_num >= num_chunks)
- return -1;
- ret = chunk_table[chunk_num + 1] - chunk_table[chunk_num];
- if (!ret)
- return ret;
-#if 0
- PARA_DEBUG_LOG("chunk %d: %lli-%lli (%lli bytes)\n",
- chunk_num,
- chunk_table[chunk_num],
- chunk_table[chunk_num + 1] - 1,
- ret);
-#endif
- return ret;
-}
+ size_t pos;
-char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
-{
+ *len = 0;
+ if (current_chunk >= num_chunks)
+ return NULL;
+ if (!current_chunk) {
+ *len = chunk_table[0];
+ pos = entry;
+ } else {
+ *len = chunk_table[current_chunk] - chunk_table[current_chunk - 1];
+ pos = entry + chunk_table[current_chunk - 1];
+ }
+ if (inbuf_size < *len) {
+ inbuf = para_realloc(inbuf, *len);
+ inbuf_size = *len;
+ }
+// PARA_DEBUG_LOG("reading chunk #%lu@%zd (%zd bytes)\n", current_chunk,
+// pos, *len);
+ ret = fseek(infile, pos, SEEK_SET);
+ if (ret < 0)
+ return NULL;
+ ret = para_fread(inbuf, *len, 1, infile);
+ if (ret != *len)
+ return NULL;
+// PARA_DEBUG_LOG("ret: %d, inbuf[0]: %lx - %lx\n", ret, (long unsigned) inbuf[0],
+// (long unsigned) inbuf[4]);
return (char *)inbuf;
}
-void aac_afh_init(void *p)
+static const char* aac_suffixes[] = {"m4a", "mp4", NULL};
+/** the init function of the aac audio format handler */
+void aac_afh_init(struct audio_format_handler *p)
{
af = p;
af->reposition_stream = aac_reposition_stream;
af->read_chunk = aac_read_chunk;
af->close_audio_file = aac_close_audio_file;
af->get_header_info = NULL;
- af->chunk_tv.tv_sec = 0;
- af->chunk_tv.tv_usec = 250 * 1000;
- tv_scale(3, &af->chunk_tv, &af->eof_tv);
+ af->suffixes = aac_suffixes;
}
projects / paraslash.git / blobdiff