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Part 2 of Kenan Gillet's QCELP silence handling patch. 

Originally committed as revision 16337 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reynaldo H. Verdejo Pinochet 2008-12-26 16:49:06 +00:00
parent 6fe68c7b97
commit 4f54fb54e3
1 changed files with 20 additions and 5 deletions
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25
libavcodec/qcelpdec.c
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@ -415,6 +415,9 @@ static void compute_svector(QCELPContext *q, const float *gain,
*cdn_vector++ = tmp_gain * qcelp_rate_full_codebook[cbseed++ & 127];
}
break;
case SILENCE:
memset(cdn_vector, 0, 160 * sizeof(float));
break;
}
}
@ -510,7 +513,7 @@ static const float *do_pitchfilter(float memory[303], const float v_in[160],
/**
* Apply pitch synthesis filter and pitch prefilter to the scaled codebook vector.
* TIA/EIA/IS-733 2.4.5.2
* TIA/EIA/IS-733 2.4.5.2, 2.4.8.7.2
*
* @param q the context
* @param cdn_vector the scaled codebook vector
@ -521,6 +524,7 @@ static void apply_pitch_filters(QCELPContext *q, float *cdn_vector)
const float *v_synthesis_filtered, *v_pre_filtered;
if(q->bitrate >= RATE_HALF ||
q->bitrate == SILENCE ||
(q->bitrate == I_F_Q && (q->prev_bitrate >= RATE_HALF)))
{
@ -538,10 +542,17 @@ static void apply_pitch_filters(QCELPContext *q, float *cdn_vector)
{
float max_pitch_gain;
if (q->bitrate == I_F_Q)
{
if (q->erasure_count < 3)
max_pitch_gain = 0.9 - 0.3 * (q->erasure_count - 1);
else
max_pitch_gain = 0.0;
}else
{
assert(q->bitrate == SILENCE);
max_pitch_gain = 1.0;
}
for(i=0; i<4; i++)
q->pitch_gain[i] = FFMIN(q->pitch_gain[i], max_pitch_gain);
@ -577,7 +588,7 @@ static void apply_pitch_filters(QCELPContext *q, float *cdn_vector)
* Interpolates LSP frequencies and computes LPC coefficients
* for a given bitrate & pitch subframe.
*
* TIA/EIA/IS-733 2.4.3.3.4
* TIA/EIA/IS-733 2.4.3.3.4, 2.4.8.7.2
*
* @param q the context
* @param curr_lspf LSP frequencies vector of the current frame
@ -605,6 +616,8 @@ void interpolate_lpc(QCELPContext *q, const float *curr_lspf, float *lpc,
}else if(q->bitrate >= RATE_QUARTER ||
(q->bitrate == I_F_Q && !subframe_num))
ff_qcelp_lspf2lpc(curr_lspf, lpc);
else if(q->bitrate == SILENCE && !subframe_num)
ff_qcelp_lspf2lpc(q->prev_lspf, lpc);
}
static qcelp_packet_rate buf_size2bitrate(const int buf_size)
@ -666,9 +679,11 @@ static int determine_bitrate(AVCodecContext *avctx, const int buf_size,
if(bitrate == SILENCE)
{
// FIXME: the decoder should not handle SILENCE frames as I_F_Q frames
ff_log_missing_feature(avctx, "Blank frame", 1);
bitrate = I_F_Q;
//FIXME: Remove experimental warning when tested with samples.
av_log(avctx, AV_LOG_WARNING, "'Blank frame handling is experimental."
" If you want to help, upload a sample "
"of this file to ftp://upload.ffmpeg.org/MPlayer/incoming/ "
"and contact the ffmpeg-devel mailing list.\n");
}
return bitrate;
}