X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=aacdec_filter.c;h=c9f81512bf5398c76e51865f8bb4acdd5fa4a5f5;hb=c22fa00c45822fe62a8a921e54f19c012680fc2b;hp=7a757e55cc413760e3d41c1556ff9bdc609ebf54;hpb=16b889fa03e8e9e97ed89370ad40fea4ee9b3e3a;p=paraslash.git

diff --git a/aacdec_filter.c b/aacdec_filter.c
index 7a757e55..c9f81512 100644
--- a/aacdec_filter.c
+++ b/aacdec_filter.c
@@ -11,8 +11,10 @@
 /** \file aacdec_filter.c paraslash's aac (m4a) decoder. */
 
 #include <regex.h>
+#include <neaacdec.h>
 
 #include "para.h"
+#include "portable_io.h"
 #include "list.h"
 #include "sched.h"
 #include "ggo.h"
@@ -20,7 +22,6 @@
 #include "filter.h"
 #include "error.h"
 #include "string.h"
-#include "aac.h"
 
 /** Give up decoding after that many errors. */
 #define MAX_ERRORS 20
@@ -54,6 +55,122 @@ struct private_aacdec_data {
 	unsigned int sample_rate;
 };
 
+/*
+ * Get a new libfaad decoder handle.
+ *
+ * \return The handle returned by NeAACDecOpen().
+ */
+static NeAACDecHandle aac_open(void)
+{
+	NeAACDecHandle h = NeAACDecOpen();
+	NeAACDecConfigurationPtr c = NeAACDecGetCurrentConfiguration(h);
+
+	c->defObjectType = LC;
+	c->outputFormat = FAAD_FMT_16BIT;
+	c->downMatrix = 0;
+	NeAACDecSetConfiguration(h, c);
+	return h;
+}
+
+static unsigned long aac_read_decoder_length(char *buf, int *description_len)
+{
+	uint8_t b;
+	uint8_t numBytes = 0;
+	unsigned long length = 0;
+
+	do {
+		b = buf[numBytes];
+		numBytes++;
+		length = (length << 7) | (b & 0x7F);
+	} while
+		((b & 0x80) && numBytes < 4);
+	*description_len = numBytes;
+	return length;
+}
+
+/*
+ * Search for the position and the length of the decoder configuration.
+ *
+ * \param buf Buffer to seach.
+ * \param buflen Length of \a buf.
+ * \param skip Upon succesful return, this contains the offset in \a buf where
+ * the decoder config starts.
+ * \param decoder_length Result pointer that is filled in with the length of
+ * the decoder configuration on success.
+ *
+ * \return Standard.
+ */
+static int aac_find_esds(char *buf, size_t buflen, size_t *skip,
+		unsigned long *decoder_length)
+{
+	size_t i;
+
+	for (i = 0; i + 4 < buflen; i++) {
+		char *p = buf + i;
+		int description_len;
+
+		if (p[0] != 'e' || p[1] != 's' || p[2] != 'd' || p[3] != 's')
+			continue;
+		i += 8;
+		p = buf + i;
+		PARA_INFO_LOG("found esds@%zu, next: %x\n", i, *p);
+		if (*p == 3)
+			i += 8;
+		else
+			i += 6;
+		p = buf + i;
+		PARA_INFO_LOG("next: %x\n", *p);
+		if (*p != 4)
+			continue;
+		i += 18;
+		p = buf + i;
+		PARA_INFO_LOG("next: %x\n", *p);
+		if (*p != 5)
+			continue;
+		i++;
+		p = buf + i;
+		*decoder_length = aac_read_decoder_length(p, &description_len);
+		PARA_INFO_LOG("decoder length: %lu\n", *decoder_length);
+		i += description_len;
+		*skip = i;
+		return 1;
+	}
+	return -E_ESDS;
+}
+
+/*
+ * Search for the first entry in the stco table.
+ *
+ * \param buf Buffer to seach.
+ * \param buflen Length of \a buf.
+ * \param skip Upon succesful return, this contains the number
+ * of bytes to skip from the input buffer.
+ *
+ * \return The position of the first entry in the table on success,
+ * -E_STCO on errors.
+ */
+static ssize_t aac_find_entry_point(char *buf, size_t buflen, size_t *skip)
+{
+	ssize_t ret;
+	size_t i;
+
+	for (i = 0; i + 20 < buflen; i++) {
+		char *p = buf + i;
+
+		if (p[0] != 's' || p[1] != 't' || p[2] != 'c' || p[3] != 'o')
+			continue;
+		PARA_INFO_LOG("found stco@%zu\n", i);
+		i += 12;
+		ret = read_u32_be(buf + i); /* first offset */
+		i += 4;
+		PARA_INFO_LOG("entry point: %zd\n", ret);
+		*skip = i;
+		return ret;
+	}
+	PARA_WARNING_LOG("stco not found, buflen: %zu\n", buflen);
+	return -E_STCO;
+}
+
 static int aacdec_execute(struct btr_node *btrn, const char *cmd, char **result)
 {
 	struct filter_node *fn = btr_context(btrn);