/*
- * 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 "error.h"
#include "string.h"
#include "aac.h"
-/* 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 int aac_find_stsz(unsigned char *buf, size_t buflen, off_t *skip)
+{
+ int i;
-unsigned num_chunks, chunk_num;
+ for (i = 0; i + 16 < buflen; i++) {
+ unsigned char *p = buf + i;
+ unsigned sample_count, sample_size;
-NeAACDecHandle handle;
-static void aac_close_audio_file(void)
-{
+ 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;
+ }
+ return -E_STSZ;
}
-/*
- * Init m4a file and write some tech data to given pointers.
- */
-static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
- int *seconds)
+static ssize_t aac_compute_chunk_table(struct audio_format_info *afi,
+ unsigned char *map, size_t numbytes)
{
- int ret, skip, decoder_len;
- unsigned inbuf_len;
- unsigned long rate = 0;
- unsigned char channels = 0;
+ int ret, i;
+ size_t sum = 0;
+ off_t skip;
- 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);
+ ret = aac_find_stsz(map, numbytes, &skip);
if (ret < 0)
return ret;
- decoder_len = ret;
- handle = aac_open();
- ret = NeAACDecInit(handle, inbuf + skip,
- inbuf_len - skip, &rate, &channels);
- PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
-
+ afi->chunks_total = ret;
+ PARA_INFO_LOG("sz table has %lu entries\n", afi->chunks_total);
+ afi->chunk_table = para_malloc((afi->chunks_total + 1) * sizeof(size_t));
+ for (i = 1; i <= afi->chunks_total; i++) {
+ if (skip + 4 > numbytes)
+ break;
+ sum += aac_read_int32(map + skip);
+ afi->chunk_table[i] = sum;
+ skip += 4;
+// if (i < 10 || i + 10 > afi->chunks_total)
+// PARA_DEBUG_LOG("offset #%d: %zu\n", i, afi->chunk_table[i]);
+ }
+ return skip;
+}
+
+static int aac_set_chunk_tv(struct audio_format_info *afi,
+ mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds)
+{
+ float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023;
+ struct timeval total;
+ long unsigned ms = 1000.0 * afi->chunks_total * tmp
+ / mp4ASC->samplingFrequency;
+
+ if (!mp4ASC->samplingFrequency)
+ return -E_MP4ASC;
+ ms = 1000.0 * afi->chunks_total * tmp / mp4ASC->samplingFrequency;
+ ms2tv(ms, &total);
+ tv_divide(afi->chunks_total, &total, &afi->chunk_tv);
+ PARA_INFO_LOG("%luHz, %lus (%lu x %lums)\n",
+ mp4ASC->samplingFrequency, ms / 1000,
+ afi->chunks_total, tv2ms(&afi->chunk_tv));
+ if (ms < 1000)
+ return -E_MP4ASC;
+ *seconds = ms / 1000;
return 1;
}
/*
- * Simple stream reposition routine
+ * Init m4a file and write some tech data to given pointers.
*/
-static int aac_reposition_stream(long unsigned request)
+static int aac_get_file_info(char *map, size_t numbytes,
+ struct audio_format_info *afi)
{
- return -E_AAC_REPOS;
-}
+ int i;
+ size_t skip;
+ ssize_t ret;
+ unsigned long rate = 0, decoder_len;
+ unsigned char channels = 0;
+ mp4AudioSpecificConfig mp4ASC;
+ NeAACDecHandle handle;
+ unsigned char *umap = (unsigned char *) map;
-static int get_chunk_size(long unsigned chunk_num)
-{
- 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
+ ret = aac_find_esds(umap, numbytes, &skip, &decoder_len);
+ if (ret < 0)
+ goto out;
+ handle = aac_open();
+ ret = -E_AACDEC_INIT;
+ if (NeAACDecInit(handle, umap + skip, decoder_len, &rate, &channels))
+ goto out;
+ if (!channels)
+ goto out;
+ PARA_INFO_LOG("rate: %lu, channels: %d\n", rate, channels);
+ ret = -E_MP4ASC;
+ if (NeAACDecAudioSpecificConfig(umap + skip, numbytes - skip, &mp4ASC))
+ goto out;
+ if (!mp4ASC.samplingFrequency)
+ goto out;
+ ret = aac_compute_chunk_table(afi, umap, numbytes);
+ if (ret < 0)
+ goto out;
+ skip = ret;
+ ret = aac_set_chunk_tv(afi, &mp4ASC, &afi->seconds_total);
+ if (ret < 0)
+ goto out;
+ ret = aac_find_entry_point(umap + skip, numbytes - skip, &skip);
+ if (ret < 0)
+ goto out;
+ afi->chunk_table[0] = ret;
+ for (i = 1; i<= afi->chunks_total; i++)
+ afi->chunk_table[i] += ret;
+ afi->channels = channels;
+ afi->frequency = rate;
+ ret = (afi->chunk_table[afi->chunks_total] - afi->chunk_table[0]) * 8; /* bits */
+ ret += (channels * afi->seconds_total * 500); /* avoid rounding error */
+ afi->bitrate = ret / (channels * afi->seconds_total * 1000);
+ sprintf(afi->info_string, "audio_file_info1:%lu x %lums, "
+ "%uHz, %d channel%s, %ukb/s\n"
+ "audio_file_info2:\n"
+ "audio_file_info3:\n",
+ afi->chunks_total, tv2ms(&afi->chunk_tv),
+ afi->frequency, channels, channels == 1? "" : "s", afi->bitrate
+ );
+ tv_scale(20, &afi->chunk_tv, &afi->eof_tv);
+ ret = 1;
+out:
return ret;
}
-char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
-{
- 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
+ *
+ * \param afh pointer to the struct to initialize
+ */
+void aac_afh_init(struct audio_format_handler *afh)
{
- af = p;
- af->reposition_stream = aac_reposition_stream;
- af->get_file_info = aac_get_file_info,
- 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);
+ afh->get_file_info = aac_get_file_info,
+ afh->suffixes = aac_suffixes;
}
projects / paraslash.git / blobdiff