From: Lynne via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Cc: Lynne <dev@lynne.ee>
Subject: [FFmpeg-devel] [PATCH 4/4] aacdec_usac: skip coeff decoding if the number to be decoded is 0
Date: Thu, 6 Jun 2024 07:12:35 +0200
Message-ID: <20240606051243.3177266-4-dev@lynne.ee> (raw)
In-Reply-To: <20240606051243.3177266-1-dev@lynne.ee>
Yet another thing not mentioned in the spec.
---
libavcodec/aac/aacdec_usac.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/libavcodec/aac/aacdec_usac.c b/libavcodec/aac/aacdec_usac.c
index 97655787ee..5dd489a43b 100644
--- a/libavcodec/aac/aacdec_usac.c
+++ b/libavcodec/aac/aacdec_usac.c
@@ -572,9 +572,15 @@ static int decode_spectrum_and_dequant_ac(AACDecContext *s, float coef[1024],
int gb_count;
GetBitContext gb2;
- ff_aac_ac_init(&ac, gb);
c = ff_aac_ac_map_process(state, reset, N);
+ if (!len) {
+ ff_aac_ac_finish(state, 0, N);
+ return 0;
+ }
+
+ ff_aac_ac_init(&ac, gb);
+
/* Backup reader for rolling back by 14 bits at the end */
gb2 = *gb;
gb_count = get_bits_count(&gb2);
--
2.43.0.381.gb435a96ce8
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prev parent reply other threads:[~2024-06-06 5:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-06 5:12 [FFmpeg-devel] [PATCH 1/4] aacdec_usac: respect tns_on_lr flag Lynne via ffmpeg-devel
2024-06-06 5:12 ` [FFmpeg-devel] [PATCH 2/4] aacdec_usac: do not continue parsing bitstream on core_mode == 1 Lynne via ffmpeg-devel
2024-06-06 5:12 ` [FFmpeg-devel] [PATCH 3/4] aacdec_usac: decouple TNS active from TNS data present flag Lynne via ffmpeg-devel
2024-06-06 5:12 ` Lynne via ffmpeg-devel [this message]
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