/*
- * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2006-2008 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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
+ */
+/*
+ * 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 <regex.h>
-#include "server.cmdline.h"
-#include "server.h"
-#include "afs.h"
+#include "para.h"
#include "error.h"
+#include "afh.h"
#include "string.h"
#include "aac.h"
-/* must be big enough to hold header */
-#define DEFAULT_INBUF_SIZE 65536
+static int aac_find_stsz(unsigned char *buf, size_t buflen, off_t *skip)
+{
+ int i;
-static FILE *infile;
-static int inbuf_size;
-static unsigned char *inbuf;
-static ssize_t *chunk_table;
-struct audio_format *af;
+ for (i = 0; i + 16 < buflen; i++) {
+ unsigned char *p = buf + i;
+ unsigned sample_count, sample_size;
-unsigned num_chunks, chunk_num;
+ if (p[0] != 's' || p[1] != 't' || p[2] != 's' || p[3] != 'z')
+ continue;
+ PARA_DEBUG_LOG("found stsz@%d\n", i);
+ i += 8;
+ sample_size = aac_read_int32(buf + i);
+ PARA_DEBUG_LOG("sample size: %d\n", sample_size);
+ i += 4;
+ sample_count = aac_read_int32(buf + i);
+ i += 4;
+ PARA_DEBUG_LOG("sample count: %d\n", sample_count);
+ *skip = i;
+ return sample_count;
+ }
+ return -E_STSZ;
+}
-NeAACDecHandle handle;
-static void aac_close_audio_file(void)
+static int atom_cmp(unsigned char *buf1, char *buf2)
{
+ unsigned char *b2 = (unsigned char *)buf2;
+
+ if (buf1[0] != b2[0])
+ return 1;
+ if (buf1[1] != b2[1])
+ return 1;
+ if (buf1[2] != b2[2])
+ return 1;
+ if (buf1[3] != b2[3])
+ return 1;
+ return 0;
}
-/*
- * 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 int read_atom_header(unsigned char *buf, uint64_t *subsize, unsigned char type[5])
{
- int ret, skip, decoder_len;
- unsigned inbuf_len;
- unsigned long rate = 0;
- unsigned char channels = 0;
+ int i;
+ uint64_t size = (buf[0] << 24) + (buf[1] << 16) + (buf[2] << 8) + buf[3];
- 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)
- 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);
-
- return 1;
+ memcpy(type, buf + 4, 4);
+ type[4] = '\0';
+
+ PARA_DEBUG_LOG("size: %llu, type: %s\n", (long long unsigned)size, type);
+ if (size != 1) {
+ *subsize = size;
+ return 8;
+ }
+ buf += 4;
+ size = 0;
+ for (i = 0; i < 8; i++)
+ size |= ((uint64_t)buf[i]) << ((7 - i) * 8);
+ *subsize = size;
+ return 16;
}
-/*
- * Simple stream reposition routine
- */
-static int aac_reposition_stream(long unsigned request)
+static char *get_tag(unsigned char *p, int size)
+{
+ char *buf;
+
+ assert(size > 0);
+ buf = para_malloc(size + 1);
+
+ memcpy(buf, p, size);
+ buf[size] = '\0';
+ PARA_DEBUG_LOG("size: %d: %s\n", size, buf);
+ return buf;
+}
+
+static void read_tags(unsigned char *buf, size_t buflen, struct afh_info *afhi)
{
- return -E_AAC_REPOS;
+ unsigned char *p = buf;
+
+ while (p + 32 < buf + buflen) {
+ unsigned char *q, type1[5], type2[5];
+ uint64_t size1, size2;
+ int ret, ret2;
+
+ ret = read_atom_header(p, &size1, type1);
+ ret2 = read_atom_header(p + ret, &size2, type2);
+
+ if (size2 <= 16 || atom_cmp(type2, "data")) {
+ p += size1;
+ continue;
+ }
+ size2 -= 16;
+ q = p + ret + ret2 + 8;
+ if (q + size2 > buf + buflen)
+ break;
+ if (!atom_cmp(type1, "©ART"))
+ afhi->tags.artist = get_tag(q, size2);
+ else if (!atom_cmp(type1, "©alb"))
+ afhi->tags.album = get_tag(q, size2);
+ else if (!atom_cmp(type1, "©nam"))
+ afhi->tags.title = get_tag(q, size2);
+ else if (!atom_cmp(type1, "©cmt"))
+ afhi->tags.comment = get_tag(q, size2);
+ else if (!atom_cmp(type1, "©day"))
+ afhi->tags.year = get_tag(q, size2);
+ p += size1;
+ }
}
-static int get_chunk_size(long unsigned chunk_num)
+static void read_meta(unsigned char *buf, size_t buflen, struct afh_info *afhi)
{
- int ret;
- if (chunk_num >= num_chunks)
- return -1;
- ret = chunk_table[chunk_num + 1] - chunk_table[chunk_num];
- if (!ret)
+ unsigned char *p = buf;
+
+ while (p + 4 < buf + buflen) {
+
+ if (p[0] != 'i' || p[1] != 'l' || p[2] != 's' || p[3] != 't') {
+ p++;
+ continue;
+ }
+ p += 4;
+ return read_tags(p, buflen - (p - buf), afhi);
+ }
+}
+
+static void aac_get_taginfo(unsigned char *buf, size_t buflen,
+ struct afh_info *afhi)
+{
+ int i;
+ uint64_t subsize;
+ unsigned char type[5];
+
+ for (i = 0; i + 24 < buflen; i++) {
+ unsigned char *p = buf + i;
+ if (p[0] != 'm' || p[1] != 'e' || p[2] != 't' || p[3] != 'a')
+ continue;
+ PARA_INFO_LOG("found metadata at offset %d\n", i);
+ i += 8;
+ p = buf + i;
+ i += read_atom_header(p, &subsize, type);
+ p = buf + i;
+ return read_meta(p, buflen - i, afhi);
+ }
+ PARA_INFO_LOG("no meta data\n");
+}
+
+static ssize_t aac_compute_chunk_table(struct afh_info *afhi,
+ unsigned char *map, size_t numbytes)
+{
+ int ret, i;
+ size_t sum = 0;
+ off_t skip;
+
+ ret = aac_find_stsz(map, numbytes, &skip);
+ if (ret < 0)
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;
+ afhi->chunks_total = ret;
+ PARA_DEBUG_LOG("sz table has %lu entries\n", afhi->chunks_total);
+ afhi->chunk_table = para_malloc((afhi->chunks_total + 1) * sizeof(size_t));
+ for (i = 1; i <= afhi->chunks_total; i++) {
+ if (skip + 4 > numbytes)
+ break;
+ sum += aac_read_int32(map + skip);
+ afhi->chunk_table[i] = sum;
+ skip += 4;
+// if (i < 10 || i + 10 > afhi->chunks_total)
+// PARA_DEBUG_LOG("offset #%d: %zu\n", i, afhi->chunk_table[i]);
+ }
+ return skip;
+}
+
+static int aac_set_chunk_tv(struct afh_info *afhi,
+ mp4AudioSpecificConfig *mp4ASC, long unsigned *seconds)
+{
+ float tmp = mp4ASC->sbr_present_flag == 1? 2047 : 1023;
+ struct timeval total;
+ long unsigned ms = 1000.0 * afhi->chunks_total * tmp
+ / mp4ASC->samplingFrequency;
+
+ if (!mp4ASC->samplingFrequency)
+ return -E_MP4ASC;
+ ms = 1000.0 * afhi->chunks_total * tmp / mp4ASC->samplingFrequency;
+ ms2tv(ms, &total);
+ tv_divide(afhi->chunks_total, &total, &afhi->chunk_tv);
+ PARA_INFO_LOG("%luHz, %lus (%lu x %lums)\n",
+ mp4ASC->samplingFrequency, ms / 1000,
+ afhi->chunks_total, tv2ms(&afhi->chunk_tv));
+ if (ms < 1000)
+ return -E_MP4ASC;
+ *seconds = ms / 1000;
+ return 1;
}
-char *aac_read_chunk(long unsigned current_chunk, ssize_t *len)
+/*
+ * Init m4a file and write some tech data to given pointers.
+ */
+static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
+ struct afh_info *afhi)
{
- return (char *)inbuf;
+ int i;
+ size_t skip;
+ ssize_t ret;
+ unsigned long rate = 0, decoder_len;
+ unsigned char channels = 0;
+ mp4AudioSpecificConfig mp4ASC;
+ NeAACDecHandle handle = NULL;
+ unsigned char *umap = (unsigned char *) map;
+
+ ret = aac_find_esds(umap, numbytes, &skip, &decoder_len);
+ if (ret < 0)
+ goto out;
+ aac_get_taginfo(umap, numbytes, afhi);
+ handle = aac_open();
+ ret = -E_AAC_AFH_INIT;
+ if (NeAACDecInit(handle, umap + skip, decoder_len, &rate, &channels))
+ goto out;
+ if (!channels)
+ goto out;
+ PARA_DEBUG_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(afhi, umap, numbytes);
+ if (ret < 0)
+ goto out;
+ skip = ret;
+ ret = aac_set_chunk_tv(afhi, &mp4ASC, &afhi->seconds_total);
+ if (ret < 0)
+ goto out;
+ ret = aac_find_entry_point(umap + skip, numbytes - skip, &skip);
+ if (ret < 0)
+ goto out;
+ afhi->chunk_table[0] = ret;
+ for (i = 1; i<= afhi->chunks_total; i++)
+ afhi->chunk_table[i] += ret;
+ afhi->channels = channels;
+ afhi->frequency = rate;
+ ret = (afhi->chunk_table[afhi->chunks_total] - afhi->chunk_table[0]) * 8; /* bits */
+ ret += (channels * afhi->seconds_total * 500); /* avoid rounding error */
+ afhi->bitrate = ret / (channels * afhi->seconds_total * 1000);
+ ret = 1;
+out:
+ if (handle)
+ NeAACDecClose(handle);
+ return ret;
}
-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;
}