We need information from the header to decode the sbr frame data.
From 725de88bb458afb05f718667eb409547d23e9f00 Mon Sep 17 00:00:00 2001
From: Alex Converse <[email protected]>
Date: Tue, 17 Nov 2009 13:23:26 -0500
Subject: [PATCH 07/12] Run SBR in pure upsampling mode until we get an SBR header.
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---
aacsbr.c | 3 +++
aacsbr.h | 1 +
2 files changed, 4 insertions(+), 0 deletions(-)
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diff --git a/aacsbr.c b/aacsbr.c
index c31daa0..d192b22 100644
--- a/aacsbr.c
+++ b/aacsbr.c
@@ -80,6 +80,8 @@ static unsigned int sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
uint8_t bs_header_extra_1;
uint8_t bs_header_extra_2;
+ sbr->start = 1;
+
// Save last spectrum parameters variables to compare to new ones
memcpy(&sbr->spectrum_params[0], &sbr->spectrum_params[1], sizeof(SpectrumParameters));
@@ -805,6 +807,7 @@ int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
if (sbr->reset)
sbr_reset(ac, sbr);
+ if (sbr->start)
num_sbr_bits += sbr_data(ac, sbr, gb, id_aac);
num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
diff --git a/aacsbr.h b/aacsbr.h
index 50d04d1..3b0f4ef 100644
--- a/aacsbr.h
+++ b/aacsbr.h
@@ -106,6 +106,7 @@ typedef struct {
* Spectral Band Replication
*/
typedef struct {
+ uint8_t start;
// SBR header bitstream variables
uint8_t bs_amp_res;
SpectrumParameters spectrum_params[2];
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