On 10/05/2012 05:23 AM, Martin Storsjö wrote: > From: Dmitry Samonenko <[email protected]> > > Discontinuous transmission is an addition to VAD/VBR operation, that > allows to greatly reduce bitrate for silent chunks or stationary > noises. > --- > libavcodec/libspeexenc.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/libavcodec/libspeexenc.c b/libavcodec/libspeexenc.c > index 43f84dc..5a5079b 100644 > --- a/libavcodec/libspeexenc.c > +++ b/libavcodec/libspeexenc.c > @@ -85,6 +85,7 @@ typedef struct { > int cbr_quality; ///< CBR quality 0 to 10 > int abr; ///< flag to enable ABR > int vad; ///< flag to enable VAD > + int dtx; ///< flag to enable DTX > int pkt_frame_count; ///< frame count for the current packet > AudioFrameQueue afq; ///< frame queue > } LibSpeexEncContext; > @@ -120,6 +121,7 @@ static av_cold void print_enc_params(AVCodecContext > *avctx, > av_log(avctx, AV_LOG_DEBUG, "packet size: %d\n", > avctx->frame_size * s->frames_per_packet); > av_log(avctx, AV_LOG_DEBUG, "voice activity detection: %d\n", s->vad); > + av_log(avctx, AV_LOG_DEBUG, "discontinuous transmission: %d\n", s->dtx); > } > > static av_cold int encode_init(AVCodecContext *avctx) > @@ -196,6 +198,13 @@ static av_cold int encode_init(AVCodecContext *avctx) > if (s->vad) > speex_encoder_ctl(s->enc_state, SPEEX_SET_VAD, &s->vad); > > + /* Activiting Discontinuous Transmission */ > + if (s->dtx) { > + speex_encoder_ctl(s->enc_state, SPEEX_SET_DTX, &s->dtx); > + if (!(s->abr || s->vad || s->header.vbr)) > + av_log(avctx, AV_LOG_WARNING, "DTX is not much of use without > ABR, VAD or VBR\n"); > + } > + > /* set encoding complexity */ > if (avctx->compression_level > FF_COMPRESSION_DEFAULT) { > complexity = av_clip(avctx->compression_level, 0, 10); > @@ -318,6 +327,7 @@ static const AVOption options[] = { > { "cbr_quality", "Set quality value (0 to 10) for CBR", > OFFSET(cbr_quality), AV_OPT_TYPE_INT, { .i64 = 8 }, 0, 10, AE }, > { "frames_per_packet", "Number of frames to encode in each packet", > OFFSET(frames_per_packet), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 8, AE }, > { "vad", "Voice Activity Detection", > OFFSET(vad), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE }, > + { "dtx", "Discontinuous Transmission", > OFFSET(dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE }, > { NULL }, > }; >
LGTM -Justin _______________________________________________ libav-devel mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-devel
