From cb26d94043cb3717aa3d27ff115cb73bbb555230 Mon Sep 17 00:00:00 2001
From: Andre <maan@p133.(none)>
Date: Tue, 16 May 2006 18:38:18 +0200
Subject: [PATCH] Make aac work with any bitrate.

By replacing the hardcoded 23ms timeout by a timeout
computed from the audio spec config.
---
 aac_afh.c    | 45 ++++++++++++++++++++-------------------------
 aac_common.c |  2 +-
 error.h      |  1 +
 3 files changed, 22 insertions(+), 26 deletions(-)

diff --git a/aac_afh.c b/aac_afh.c
index a8d162e4..601621ed 100644
--- a/aac_afh.c
+++ b/aac_afh.c
@@ -109,13 +109,27 @@ static int read_chunk_table(size_t skip)
 		sum += aac_read_int32(inbuf + skip);
 		chunk_table[i] = sum;
 		skip += 4;
-		if (i < 10 || i > num_chunks - 10)
+		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;
+}
+
 /*
  * Init m4a file and write some tech data to given pointers.
  */
@@ -133,12 +147,9 @@ static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
 	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)
@@ -151,17 +162,15 @@ static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
 		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) {
-		PARA_DEBUG_LOG("mp4ASC.samplingFrequency: %lu\n",
-			mp4ASC.samplingFrequency);
-	} else
-		PARA_WARNING_LOG("no mp4ASC %s\n", "");
-
+	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)
@@ -172,23 +181,11 @@ static int aac_get_file_info(FILE *file, char *info_str, long unsigned *frames,
 		PARA_INFO_LOG("next buffer: %d bytes\n", ret);
 	}
 	entry = ret;
-	PARA_INFO_LOG("offset table has %zu entries, entry: %zu\n", num_chunks,
-		entry);
-#if 1
 	sprintf(info_str, "audio_file_info1:%zu x %lums\n"
 		"audio_file_info2:\n"
 		"audio_file_info3:\n",
 		num_chunks,
 		tv2ms(&af->chunk_tv));
-#endif
-#if 1
-	{
-	struct timeval total_tv;
-	tv_scale(num_chunks, &af->chunk_tv, &total_tv);
-	*seconds = tv2ms(&total_tv) / 1000;
-	PARA_INFO_LOG("%d seconds, %zu chunks\n", *seconds, num_chunks);
-	}
-#endif
 	return 1;
 }
 
@@ -243,8 +240,6 @@ void aac_afh_init(struct audio_format_handler *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 = 23120;
 	tv_scale(3, &af->chunk_tv, &af->eof_tv);
 	af->suffixes = aac_suffixes;
 }
diff --git a/aac_common.c b/aac_common.c
index 7ccc668f..2dc97901 100644
--- a/aac_common.c
+++ b/aac_common.c
@@ -130,7 +130,7 @@ ssize_t aac_find_entry_point(unsigned char *buf, size_t buflen, size_t *skip)
 		i += 12;
 		ret = aac_read_int32(buf + i); /* first offset */
 		i += 4;
-		PARA_INFO_LOG("num entries: %zd\n", ret);
+		PARA_INFO_LOG("entry point: %zd\n", ret);
 		*skip = i;
 		return ret;
 	}
diff --git a/error.h b/error.h
index b70f7b47..dabe82bf 100644
--- a/error.h
+++ b/error.h
@@ -194,6 +194,7 @@ extern const char **para_errlist[];
 	PARA_ERROR(AAC_REPOS, "aac repositioning error"), \
 	PARA_ERROR(AAC_READ, "aac read error"), \
 	PARA_ERROR(STSZ, "did not find stcz atom"), \
+	PARA_ERROR(MP4ASC, "audio spec config error"), \
 
 
 #define AAC_COMMON_ERRORS \
-- 
2.39.2