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| author | Dmitry Samonenko <shreddingwork@gmail.com> | 2012-10-05 00:36:16 +0400 |
|---|---|---|
| committer | Martin Storsjö <martin@martin.st> | 2012-10-05 23:29:24 +0300 |
| commit | 978d5bd2a7d803ed5ebfe29600811555db4f632b (patch) | |
| tree | 8ca8dcfb51724765894b7822d5d293da4498e0c7 | |
| parent | 2f49e3da3320e49edb40713af503af0db5b3bba6 (diff) | |
| download | ffmpeg-978d5bd2a7d803ed5ebfe29600811555db4f632b.tar.gz | |
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>
| -rw-r--r-- | libavcodec/libspeexenc.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/libavcodec/libspeexenc.c b/libavcodec/libspeexenc.c index 43f84dc5f4..5a5079b43c 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 }, }; |