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https://github.com/FFmpeg/FFmpeg.git
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avcodec/mlpenc: implement advanced stereo rematrix
This commit is contained in:
Paul B Mahol
parent
727ee32da7
commit
b206056c82
@ -135,6 +135,7 @@ typedef struct MLPEncodeContext {
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int min_restart_interval; ///< Min interval of access units in between two major frames.
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int cur_restart_interval;
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int lpc_coeff_precision;
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int rematrix_precision;
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int lpc_type;
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int lpc_passes;
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int prediction_order;
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@ -263,8 +264,8 @@ static int compare_matrix_params(MLPEncodeContext *ctx, const MatrixParams *prev
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if (!mp->count)
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return 0;
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for (unsigned int channel = rh->min_channel; channel <= rh->max_channel; channel++)
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if (prev->fbits[channel] != mp->fbits[channel])
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for (unsigned int ch = rh->min_channel; ch <= rh->max_channel; ch++)
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if (prev->fbits[ch] != mp->fbits[ch])
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return 1;
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for (unsigned int mat = 0; mat < mp->count; mat++) {
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@ -274,8 +275,8 @@ static int compare_matrix_params(MLPEncodeContext *ctx, const MatrixParams *prev
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if (prev->lsb_bypass[mat] != mp->lsb_bypass[mat])
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return 1;
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for (unsigned int channel = 0; channel < ctx->num_channels; channel++)
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if (prev->coeff[mat][channel] != mp->coeff[mat][channel])
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for (unsigned int ch = 0; ch <= rh->max_matrix_channel; ch++)
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if (prev->coeff[mat][ch] != mp->coeff[mat][ch])
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return 1;
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}
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@ -1143,8 +1144,7 @@ static int write_access_unit(MLPEncodeContext *ctx, uint8_t *buf,
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* lossless_check_data that will be written to the restart header.
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*/
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static void input_data_internal(MLPEncodeContext *ctx, const uint8_t *samples,
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int nb_samples,
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int is24)
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int nb_samples, int is24)
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{
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int32_t *lossless_check_data = &ctx->b[ctx->frame_index].lossless_check_data;
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const int32_t *samples_32 = (const int32_t *) samples;
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@ -1167,6 +1167,14 @@ static void input_data_internal(MLPEncodeContext *ctx, const uint8_t *samples,
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}
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}
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for (int i = nb_samples; i < ctx->avctx->frame_size; i++) {
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for (unsigned int ch = 0; ch <= rh->max_channel; ch++) {
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int32_t *sample_buffer = ctx->b[ctx->frame_index].inout_buffer[ch];
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sample_buffer[i] = 0;
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}
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}
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ctx->b[ctx->frame_index].max_output_bits = bits;
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*lossless_check_data++ = temp_lossless_check_data;
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@ -1330,8 +1338,11 @@ static int estimate_coeff(MLPEncodeContext *ctx,
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MatrixParams *mp,
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unsigned int ch0, unsigned int ch1)
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{
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int first = 1, x, x0;
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int64_t g = 0, g0 = 0;
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int32_t maxl = INT32_MIN, maxr = INT32_MIN, minl = INT32_MAX, minr = INT32_MAX;
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int64_t summ = 0, sums = 0, suml = 0, sumr = 0, enl = 0, enr = 0;
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const int shift = 14 - ctx->rematrix_precision;
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int32_t cf0, cf1, e[4], d[4], ml, mr;
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int i, count = 0;
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for (int j = 0; j <= ctx->cur_restart_interval; j++) {
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DecodingParams *dp = &ctx->b[j].decoding_params;
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@ -1341,56 +1352,63 @@ static int estimate_coeff(MLPEncodeContext *ctx,
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ch[1] = dp->sample_buffer[ch1];
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for (int i = 0; i < dp->blocksize; i++) {
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int64_t c0, c1;
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int32_t a0, a1;
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int32_t lm = ch[0][i], rm = ch[1][i];
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c0 = ch[0][i];
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c1 = ch[1][i];
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enl += FFABS(lm);
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enr += FFABS(rm);
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if (!c0 && !c1)
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continue;
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summ += FFABS(lm + rm);
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sums += FFABS(lm - rm);
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if (!c0 || !c1) {
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g0 = 0;
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goto end;
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}
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suml += lm;
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sumr += rm;
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a0 = FFABS(c0);
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a1 = FFABS(c1);
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maxl = FFMAX(maxl, lm);
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maxr = FFMAX(maxr, rm);
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if (a0 >= a1) {
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g = (c1 * (1 << 14)) / c0;
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x = ch1;
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} else if (a0 < a1) {
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g = (c0 * (1 << 14)) / c1;
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x = ch0;
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}
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if (first) {
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g0 = g;
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x0 = x;
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first = 0;
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} else if (g != g0 || x != x0) {
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g0 = 0;
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goto end;
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}
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minl = FFMIN(minl, lm);
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minr = FFMIN(minr, rm);
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}
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}
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end:
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if (g0) {
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mp->outch[0] = (x0 == ch0) ? ch0 : ch1;
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summ -= FFABS(suml + sumr);
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sums -= FFABS(suml - sumr);
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mp->coeff[0][ch0] = (x0 == ch1) ? g0 : 0;
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mp->coeff[0][ch1] = (x0 == ch0) ? g0 : 0;
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ml = maxl - minl;
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mr = maxr - minr;
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mp->forco[0][ch0] = 0;
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mp->forco[0][ch1] = 0;
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if (!summ && !sums)
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return 0;
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return 1;
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}
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if (!ml || !mr)
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return 0;
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return 0;
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if ((FFABS(ml) + FFABS(mr)) >= (1 << 24))
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return 0;
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cf0 = (FFMIN(FFABS(mr), FFABS(ml)) * (1LL << 14)) / FFMAX(FFABS(ml), FFABS(mr));
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cf0 = (cf0 >> shift) << shift;
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cf1 = -cf0;
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if (sums > summ)
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FFSWAP(int32_t, cf0, cf1);
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count = 1;
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i = enl < enr;
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mp->outch[0] = i;
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d[!i] = cf0;
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d[ i] = 1 << 14;
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e[!i] = cf1;
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e[ i] = 1 << 14;
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mp->coeff[0][ch0] = av_clip_intp2(d[0], 15);
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mp->coeff[0][ch1] = av_clip_intp2(d[1], 15);
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mp->forco[0][ch0] = av_clip_intp2(e[0], 15);
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mp->forco[0][ch1] = av_clip_intp2(e[1], 15);
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return count;
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}
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/** Determines how many fractional bits are needed to encode matrix
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@ -1400,10 +1418,11 @@ static void code_matrix_coeffs(MLPEncodeContext *ctx,
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DecodingParams *dp,
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unsigned int mat)
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{
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RestartHeader *rh = ctx->cur_restart_header;
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MatrixParams *mp = &dp->matrix_params;
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int32_t coeff_mask = 0;
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for (unsigned int channel = 0; channel < ctx->num_channels; channel++) {
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for (unsigned int channel = 0; channel <= rh->max_matrix_channel; channel++) {
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coeff_mask |= mp->coeff[mat][channel];
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}
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@ -1787,10 +1806,12 @@ static void generate_2_noise_channels(MLPEncodeContext *ctx)
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/** Rematrixes all channels using chosen coefficients. */
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static void rematrix_channels(MLPEncodeContext *ctx)
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{
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RestartHeader *rh = ctx->cur_restart_header;
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DecodingParams *dp1 = &ctx->b[1].decoding_params;
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MatrixParams *mp1 = &dp1->matrix_params;
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unsigned int maxchan = ctx->num_channels;
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int32_t input_samples[MAX_NCHANNELS];
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unsigned int maxchan = rh->max_matrix_channel;
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int32_t orig_samples[MAX_NCHANNELS];
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int32_t rematrix_samples[MAX_NCHANNELS];
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uint8_t lsb_bypass[MAX_MATRICES] = { 0 };
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for (unsigned int j = 0; j <= ctx->cur_restart_interval; j++) {
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@ -1798,35 +1819,39 @@ static void rematrix_channels(MLPEncodeContext *ctx)
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MatrixParams *mp = &dp->matrix_params;
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for (unsigned int i = 0; i < dp->blocksize; i++) {
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for (unsigned int ch = 0; ch < maxchan; ch++)
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input_samples[ch] = dp->sample_buffer[ch][i];
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for (unsigned int ch = 0; ch <= maxchan; ch++)
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orig_samples[ch] = rematrix_samples[ch] = dp->sample_buffer[ch][i];
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for (unsigned int mat = 0; mat < mp1->count; mat++) {
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for (int mat = 0; mat < mp1->count; mat++) {
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unsigned int outch = mp1->outch[mat];
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int64_t accum = 0;
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for (unsigned int ch = 0; ch < maxchan; ch++) {
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int32_t sample = input_samples[ch];
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for (int ch = 0; ch <= maxchan; ch++) {
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int32_t sample = rematrix_samples[ch];
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accum += (int64_t)sample * mp1->forco[mat][ch];
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}
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dp->sample_buffer[outch][i] = accum >> 14;
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rematrix_samples[outch] = accum >> 14;
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}
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for (unsigned int ch = 0; ch <= maxchan; ch++)
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dp->sample_buffer[ch][i] = rematrix_samples[ch];
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for (unsigned int mat = 0; mat < mp1->count; mat++) {
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int8_t *bypassed_lsbs = mp->bypassed_lsbs[mat];
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unsigned int outch = mp1->outch[mat];
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int64_t accum = 0;
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int8_t bit;
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for (unsigned int ch = 0; ch < maxchan; ch++) {
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int32_t sample = dp->sample_buffer[ch][i];
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for (unsigned int ch = 0; ch <= maxchan; ch++) {
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int32_t sample = rematrix_samples[ch];
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accum += (int64_t)sample * mp1->coeff[mat][ch];
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}
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bit = (accum >> 14) != input_samples[outch];
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rematrix_samples[outch] = accum >> 14;
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bit = rematrix_samples[outch] != orig_samples[outch];
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bypassed_lsbs[i] = bit;
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lsb_bypass[mat] |= bit;
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@ -2170,6 +2195,7 @@ static const AVOption mlp_options[] = {
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{ "prediction_order", "Search method for selecting prediction order", OFFSET(prediction_order), AV_OPT_TYPE_INT, {.i64 = ORDER_METHOD_EST }, ORDER_METHOD_EST, ORDER_METHOD_SEARCH, FLAGS, "predm" },
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{ "estimation", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_EST }, 0, 0, FLAGS, "predm" },
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{ "search", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = ORDER_METHOD_SEARCH }, 0, 0, FLAGS, "predm" },
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{ "rematrix_precision", "Rematrix coefficient precision", OFFSET(rematrix_precision), AV_OPT_TYPE_INT, {.i64 = 1 }, 0, 14, FLAGS },
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{ NULL },
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};
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