@@ -1000,6 +1000,10 @@ Other values include 0 for mono and stereo, 1 for surround sound with masking
and LFE bandwidth optimizations, and 255 for independent streams with an
unspecified channel layout.
+@item dtx (N.A.)
+Allow discontinuous transmission when set to 1. The default value is 0
+(disabled).
+
@item apply_phase_inv (N.A.) (requires libopus >= 1.2)
If set to 0, disables the use of phase inversion for intensity stereo,
improving the quality of mono downmixes, but slightly reducing normal stereo
@@ -42,6 +42,7 @@ typedef struct LibopusEncOpts {
int packet_size;
int max_bandwidth;
int mapping_family;
+ int dtx;
#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST
int apply_phase_inv;
#endif
@@ -159,6 +160,13 @@ static int libopus_configure_encoder(AVCodecContext *avctx, OpusMSEncoder *enc,
"Unable to set inband FEC: %s\n",
opus_strerror(ret));
+ ret = opus_multistream_encoder_ctl(enc,
+ OPUS_SET_DTX(opts->dtx));
+ if (ret != OPUS_OK)
+ av_log(avctx, AV_LOG_WARNING,
+ "Unable to set DTX: %s\n",
+ opus_strerror(ret));
+
if (avctx->cutoff) {
ret = opus_multistream_encoder_ctl(enc,
OPUS_SET_MAX_BANDWIDTH(opts->max_bandwidth));
@@ -556,6 +564,7 @@ static const AVOption libopus_options[] = {
{ "on", "Use variable bit rate", 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, 0, 0, FLAGS, .unit = "vbr" },
{ "constrained", "Use constrained VBR", 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, 0, 0, FLAGS, .unit = "vbr" },
{ "mapping_family", "Channel Mapping Family", OFFSET(mapping_family), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, FLAGS, .unit = "mapping_family" },
+ { "dtx", "Enable DTX (Discontinuous transmission)", OFFSET(dtx), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST
{ "apply_phase_inv", "Apply intensity stereo phase inversion", OFFSET(apply_phase_inv), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
#endif
From: Paul Adenot <padenot@mozilla.com> --- doc/encoders.texi | 4 ++++ libavcodec/libopusenc.c | 9 +++++++++ 2 files changed, 13 insertions(+)