X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=aac_afh.c;h=04461178bb7912e3fb893cc5cf0215d39f965368;hp=436005e0db128796618e6b34285dc06110a04c8e;hb=f31f8ceeaff0db558b63a46559e7d7464859d0c4;hpb=55f0f9461990455656bef7a36b0f963e3d676653;ds=sidebyside

diff --git a/aac_afh.c b/aac_afh.c
index 436005e0..04461178 100644
--- a/aac_afh.c
+++ b/aac_afh.c
@@ -1,121 +1,277 @@
 /*
- * 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 <osl.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;
 }