Previously, it was always left in the automatic mode, if the option
was set to the only special (negative) value. Now there's two separate
special values for this option, -1 for automatic (metadata based)
and -2 for explicitly disabled.
---
libavcodec/libfdk-aacdec.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/libavcodec/libfdk-aacdec.c b/libavcodec/libfdk-aacdec.c
index 32a97958c4..cc50fdce2f 100644
--- a/libavcodec/libfdk-aacdec.c
+++ b/libavcodec/libfdk-aacdec.c
@@ -76,8 +76,8 @@ static const AVOption fdk_aac_dec_options[] = {
OFFSET(drc_boost), AV_OPT_TYPE_INT, { .i64 = -1 },
-1, 127, AD, NULL },
{ "drc_cut", "Dynamic Range Control: attenuation factor, where [0] is
none and [127] is max compression",
OFFSET(drc_cut), AV_OPT_TYPE_INT, { .i64 = -1 },
-1, 127, AD, NULL },
- { "drc_level", "Dynamic Range Control: reference level, quantized to
0.25dB steps where [0] is 0dB and [127] is -31.75dB",
- OFFSET(drc_level), AV_OPT_TYPE_INT, { .i64 = -1},
-1, 127, AD, NULL },
+ { "drc_level", "Dynamic Range Control: reference level, quantized to
0.25dB steps where [0] is 0dB and [127] is -31.75dB, -1 for auto, and -2 for
disabled",
+ OFFSET(drc_level), AV_OPT_TYPE_INT, { .i64 = -1},
-2, 127, AD, NULL },
{ "drc_heavy", "Dynamic Range Control: heavy compression, where [1] is on
(RF mode) and [0] is off",
OFFSET(drc_heavy), AV_OPT_TYPE_INT, { .i64 = -1},
-1, 1, AD, NULL },
#if FDKDEC_VER_AT_LEAST(2, 5) // 2.5.10
@@ -298,6 +298,12 @@ static av_cold int fdk_aac_decode_init(AVCodecContext
*avctx)
}
if (s->drc_level != -1) {
+ // This option defaults to -1, i.e. not calling
+ // aacDecoder_SetParam(AAC_DRC_REFERENCE_LEVEL) at all, which defaults
+ // to the level from DRC metadata, if available. The user can set
+ // -drc_level -2, which calls aacDecoder_SetParam(
+ // AAC_DRC_REFERENCE_LEVEL) with a negative value, which then
+ // explicitly disables the feature.
if (aacDecoder_SetParam(s->handle, AAC_DRC_REFERENCE_LEVEL,
s->drc_level) != AAC_DEC_OK) {
av_log(avctx, AV_LOG_ERROR, "Unable to set DRC reference level in
the decoder\n");
return AVERROR_UNKNOWN;
--
2.21.1 (Apple Git-122.3)
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