[FFmpeg-devel] [PATCH] avcodec: Allow enabling DTX in libopusenc

[Paul Adenot <padenot@mozilla.com>]

From: Paul Adenot <padenot@mozilla.com>

---
 doc/encoders.texi       | 4 ++++
 libavcodec/libopusenc.c | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index 7c223ed74c..d459b2865f 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -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
diff --git a/libavcodec/libopusenc.c b/libavcodec/libopusenc.c
index af25f27f74..e727448cdd 100644
--- a/libavcodec/libopusenc.c
+++ b/libavcodec/libopusenc.c
@@ -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
-- 
2.40.1

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