libspeexenc: Add an option for enabling DTX
Discontinuous transmission is an addition to VAD/VBR operation, that allows to greatly reduce bitrate for silent chunks or stationary noises. Signed-off-by: Martin Storsjö <martin@martin.st>
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@ -85,6 +85,7 @@ typedef struct {
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int cbr_quality; ///< CBR quality 0 to 10
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int abr; ///< flag to enable ABR
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int vad; ///< flag to enable VAD
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int dtx; ///< flag to enable DTX
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int pkt_frame_count; ///< frame count for the current packet
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AudioFrameQueue afq; ///< frame queue
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} LibSpeexEncContext;
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@ -120,6 +121,7 @@ static av_cold void print_enc_params(AVCodecContext *avctx,
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av_log(avctx, AV_LOG_DEBUG, "packet size: %d\n",
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avctx->frame_size * s->frames_per_packet);
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av_log(avctx, AV_LOG_DEBUG, "voice activity detection: %d\n", s->vad);
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av_log(avctx, AV_LOG_DEBUG, "discontinuous transmission: %d\n", s->dtx);
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}
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static av_cold int encode_init(AVCodecContext *avctx)
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@ -196,6 +198,13 @@ static av_cold int encode_init(AVCodecContext *avctx)
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if (s->vad)
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speex_encoder_ctl(s->enc_state, SPEEX_SET_VAD, &s->vad);
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/* Activiting Discontinuous Transmission */
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if (s->dtx) {
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speex_encoder_ctl(s->enc_state, SPEEX_SET_DTX, &s->dtx);
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if (!(s->abr || s->vad || s->header.vbr))
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av_log(avctx, AV_LOG_WARNING, "DTX is not much of use without ABR, VAD or VBR\n");
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}
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/* set encoding complexity */
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if (avctx->compression_level > FF_COMPRESSION_DEFAULT) {
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complexity = av_clip(avctx->compression_level, 0, 10);
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@ -318,6 +327,7 @@ static const AVOption options[] = {
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{ "cbr_quality", "Set quality value (0 to 10) for CBR", OFFSET(cbr_quality), AV_OPT_TYPE_INT, { .i64 = 8 }, 0, 10, AE },
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{ "frames_per_packet", "Number of frames to encode in each packet", OFFSET(frames_per_packet), AV_OPT_TYPE_INT, { .i64 = 1 }, 1, 8, AE },
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{ "vad", "Voice Activity Detection", OFFSET(vad), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE },
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{ "dtx", "Discontinuous Transmission", OFFSET(dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE },
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{ NULL },
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};
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