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More OKed parts of the QCELP decoder
patch by Kenan Gillet, kenan.gillet gmail com Originally committed as revision 15802 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kenan Gillet
Vitor Sessak
parent
e22192ecc3
commit
200de8c6bb
@ -378,6 +378,38 @@ static const qcelp_vector * const qcelp_lspvq[5] = {
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qcelp_lspvq5
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qcelp_lspvq5
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};
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};
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/**
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* the final gain scalefactor before clipping into a usable output float
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*/
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#define QCELP_SCALE 8192.
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/**
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* table for computing Ga (decoded linear codebook gain magnitude)
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*
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* @note The table could fit in int16_t in x*8 form, but it seems
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* to be slower on x86
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*
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* TIA/EIA/IS-733 2.4.6.2.1-3
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*/
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static const float qcelp_g12ga[61] = {
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1.000/QCELP_SCALE, 1.125/QCELP_SCALE, 1.250/QCELP_SCALE, 1.375/QCELP_SCALE,
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1.625/QCELP_SCALE, 1.750/QCELP_SCALE, 2.000/QCELP_SCALE, 2.250/QCELP_SCALE,
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2.500/QCELP_SCALE, 2.875/QCELP_SCALE, 3.125/QCELP_SCALE, 3.500/QCELP_SCALE,
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4.000/QCELP_SCALE, 4.500/QCELP_SCALE, 5.000/QCELP_SCALE, 5.625/QCELP_SCALE,
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6.250/QCELP_SCALE, 7.125/QCELP_SCALE, 8.000/QCELP_SCALE, 8.875/QCELP_SCALE,
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10.000/QCELP_SCALE, 11.250/QCELP_SCALE, 12.625/QCELP_SCALE, 14.125/QCELP_SCALE,
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15.875/QCELP_SCALE, 17.750/QCELP_SCALE, 20.000/QCELP_SCALE, 22.375/QCELP_SCALE,
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25.125/QCELP_SCALE, 28.125/QCELP_SCALE, 31.625/QCELP_SCALE, 35.500/QCELP_SCALE,
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39.750/QCELP_SCALE, 44.625/QCELP_SCALE, 50.125/QCELP_SCALE, 56.250/QCELP_SCALE,
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63.125/QCELP_SCALE, 70.750/QCELP_SCALE, 79.375/QCELP_SCALE, 89.125/QCELP_SCALE,
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100.000/QCELP_SCALE, 112.250/QCELP_SCALE, 125.875/QCELP_SCALE, 141.250/QCELP_SCALE,
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158.500/QCELP_SCALE, 177.875/QCELP_SCALE, 199.500/QCELP_SCALE, 223.875/QCELP_SCALE,
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251.250/QCELP_SCALE, 281.875/QCELP_SCALE, 316.250/QCELP_SCALE, 354.875/QCELP_SCALE,
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398.125/QCELP_SCALE, 446.625/QCELP_SCALE, 501.125/QCELP_SCALE, 563.375/QCELP_SCALE,
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631.000/QCELP_SCALE, 708.000/QCELP_SCALE, 794.375/QCELP_SCALE, 891.250/QCELP_SCALE,
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1000.000/QCELP_SCALE};
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/**
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/**
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* circular codebook for rate 1 frames in x*100 form
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* circular codebook for rate 1 frames in x*100 form
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*
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*
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@ -428,4 +460,18 @@ static const int8_t qcelp_rate_half_codebook[128] = {
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};
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};
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#define QCELP_RATE_HALF_CODEBOOK_RATIO 0.5
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#define QCELP_RATE_HALF_CODEBOOK_RATIO 0.5
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/**
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* table for impulse response of BPF used to filter
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* the white excitation for framerate 1/4 synthesis
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*
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* Only half the tables are needed because of symetry.
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*
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* TIA/EIA/IS-733 2.4.8.1.2-1.1
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*/
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static const double qcelp_rnd_fir_coefs[11] = {
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-1.344519e-1, 1.735384e-2, -6.905826e-2, 2.434368e-2,
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-8.210701e-2, 3.041388e-2, -9.251384e-2, 3.501983e-2,
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-9.918777e-2, 3.749518e-2, 8.985137e-1
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};
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#endif /* AVCODEC_QCELPDATA_H */
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#endif /* AVCODEC_QCELPDATA_H */
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@ -103,6 +103,39 @@ static const float *do_pitchfilter(float memory[303],
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return memory + 143;
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return memory + 143;
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}
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}
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/**
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* Interpolates LSP frequencies and computes LPC coefficients
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* for a given framerate & pitch subframe.
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*
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* TIA/EIA/IS-733 2.4.3.3.4
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*
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* @param q the context
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* @param curr_lspf LSP frequencies vector of the current frame
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* @param lpc float vector for the resulting LPC
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* @param subframe_num frame number in decoded stream
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*/
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void interpolate_lpc(QCELPContext *q,
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const float *curr_lspf,
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float *lpc,
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const int subframe_num) {
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float interpolated_lspf[10];
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float weight;
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if (q->framerate >= RATE_QUARTER) {
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weight = 0.25 * (subframe_num + 1);
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} else if (q->framerate == RATE_OCTAVE && !subframe_num) {
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weight = 0.625;
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} else {
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weight = 1.0;
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}
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if (weight != 1.0) {
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weighted_vector_sumf(interpolated_lspf, curr_lspf, q->prev_lspf, weight, 1.0 - weight, 10);
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lspf2lpc(q, interpolated_lspf, lpc);
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} else if (q->framerate >= RATE_QUARTER || (q->framerate == I_F_Q && !subframe_num))
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lspf2lpc(q, curr_lspf, lpc);
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}
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static int buf_size2framerate(const int buf_size) {
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static int buf_size2framerate(const int buf_size) {
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switch (buf_size) {
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switch (buf_size) {
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case 35:
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case 35:
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@ -123,3 +156,14 @@ static void warn_insufficient_frame_quality(AVCodecContext *avctx,
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const char *message) {
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const char *message) {
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av_log(avctx, AV_LOG_WARNING, "Frame #%d, IFQ: %s\n", avctx->frame_number, message);
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av_log(avctx, AV_LOG_WARNING, "Frame #%d, IFQ: %s\n", avctx->frame_number, message);
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}
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}
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AVCodec qcelp_decoder =
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{
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.name = "qcelp",
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.type = CODEC_TYPE_AUDIO,
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.id = CODEC_ID_QCELP,
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.init = qcelp_decode_init,
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.decode = qcelp_decode_frame,
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.priv_data_size = sizeof(QCELPContext),
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.long_name = NULL_IF_CONFIG_SMALL("QCELP / PureVoice"),
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};
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