X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=aac_afh.c;h=fdb37a7e0f3d8c89ac1ee6992aad2cfeb920f763;hp=436005e0db128796618e6b34285dc06110a04c8e;hb=1b39496da38155b84636c0f7cee7f7dbbea33632;hpb=55f0f9461990455656bef7a36b0f963e3d676653

diff --git a/aac_afh.c b/aac_afh.c
index 436005e0..fdb37a7e 100644
--- a/aac_afh.c
+++ b/aac_afh.c
@@ -15,15 +15,21 @@
  *     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 "afh.h"
 #include "error.h"
 #include "string.h"
 #include "aac.h"
+#include "fd.h"
 
 /* must be big enough to hold header */
 #define DEFAULT_INBUF_SIZE 65536
@@ -31,14 +37,98 @@
 static FILE *infile;
 static int inbuf_size;
 static unsigned char *inbuf;
-static ssize_t *chunk_table;
-struct audio_format *af;
-
-unsigned num_chunks, chunk_num;
+static size_t inbuf_len;
+struct audio_format_handler *af;
+static size_t num_chunks;
+static size_t entry;
 
+static size_t *chunk_table;
 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;
+
+}
+
+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;
 }
 
 /*
@@ -47,22 +137,20 @@ static void aac_close_audio_file(void)
 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)
@@ -70,9 +158,36 @@ static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
 	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;
 }
 
@@ -81,33 +196,45 @@ static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
  */
 static int aac_reposition_stream(long unsigned request)
 {
-	return -E_AAC_REPOS;
+	return 1;
+//	return -E_AAC_REPOS;
 }
 
-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", 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;
@@ -115,7 +242,5 @@ void aac_afh_init(void *p)
 	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;
 }