mirror of https://git.ffmpeg.org/ffmpeg.git
AAC: Unswitch loop over window groups in decode_spectrum_and_dequant()
GCC should be able to do this, but doesn't. Slightly faster code. Originally committed as revision 21190 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -982,13 +982,12 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
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VLC_TYPE (*vlc_tab)[2] = vlc_spectral[cbt_m1].table;
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const int cb_size = ff_aac_spectral_sizes[cbt_m1];
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for (group = 0; group < g_len; group++, cfo+=128) {
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float *cf = cfo;
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uint32_t *icf = (uint32_t *) cf;
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int len = off_len;
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switch (cbt_m1 >> 1) {
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case 0:
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for (group = 0; group < g_len; group++, cfo+=128) {
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float *cf = cfo;
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int len = off_len;
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do {
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const int index = get_vlc2(gb, vlc_tab, 6, 3);
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unsigned cb_idx;
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@ -1001,8 +1000,14 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
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cb_idx = cb_vector_idx[index];
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cf = VMUL4(cf, vq, cb_idx, sf + idx);
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} while (len -= 4);
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}
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break;
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case 1:
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for (group = 0; group < g_len; group++, cfo+=128) {
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float *cf = cfo;
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int len = off_len;
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do {
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const int index = get_vlc2(gb, vlc_tab, 6, 3);
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unsigned nnz;
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@ -1019,8 +1024,14 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
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bits = get_bits(gb, nnz) << (32-nnz);
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cf = VMUL4S(cf, vq, cb_idx, bits, sf + idx);
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} while (len -= 4);
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}
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break;
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case 2:
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for (group = 0; group < g_len; group++, cfo+=128) {
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float *cf = cfo;
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int len = off_len;
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do {
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const int index = get_vlc2(gb, vlc_tab, 6, 3);
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unsigned cb_idx;
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@ -1033,9 +1044,15 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
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cb_idx = cb_vector_idx[index];
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cf = VMUL2(cf, vq, cb_idx, sf + idx);
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} while (len -= 2);
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}
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break;
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case 3:
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case 4:
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for (group = 0; group < g_len; group++, cfo+=128) {
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float *cf = cfo;
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int len = off_len;
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do {
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const int index = get_vlc2(gb, vlc_tab, 6, 3);
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unsigned nnz;
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@ -1052,8 +1069,15 @@ static int decode_spectrum_and_dequant(AACContext *ac, float coef[1024],
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sign = get_bits(gb, nnz) << (cb_idx >> 12);
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cf = VMUL2S(cf, vq, cb_idx, sign, sf + idx);
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} while (len -= 2);
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}
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break;
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default:
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for (group = 0; group < g_len; group++, cfo+=128) {
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float *cf = cfo;
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uint32_t *icf = (uint32_t *) cf;
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int len = off_len;
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do {
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const int index = get_vlc2(gb, vlc_tab, 6, 3);
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unsigned nzt, nnz;
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