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| author | Adriano Pallavicino <adriano.pallavicino@gmail.com> | 2016-09-27 20:22:20 +0200 |
|---|---|---|
| committer | Josh de Kock <josh@itanimul.li> | 2016-09-28 12:35:58 +0100 |
| commit | 25866680fd6ba2e1994e8aeda2e3b1a1938e8385 (patch) | |
| tree | f38e6b3e44c09330a2a216391d071c7245bcff91 | |
| parent | 7e9e1b7070242a79fa6e3acd749d7fe76e39ea7b (diff) | |
| download | ffmpeg-25866680fd6ba2e1994e8aeda2e3b1a1938e8385.tar.gz | |
lavc/qdm2: increase code clarity
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Josh de Kock <josh@itanimul.li>
| -rw-r--r-- | libavcodec/qdm2.c | 117 |
1 files changed, 59 insertions, 58 deletions
diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c index dd8b257f04..e3cc902f45 100644 --- a/libavcodec/qdm2.c +++ b/libavcodec/qdm2.c @@ -537,7 +537,7 @@ static void fill_coding_method_array(sb_int8_array tone_level_idx, /* This case is untested, no samples available */ avpriv_request_sample(NULL, "!superblocktype_2_3"); return; - for (ch = 0; ch < nb_channels; ch++) + for (ch = 0; ch < nb_channels; ch++) { for (sb = 0; sb < 30; sb++) { for (j = 1; j < 63; j++) { // The loop only iterates to 63 so the code doesn't overflow the buffer add1 = tone_level_idx[ch][sb][j] - 10; @@ -566,67 +566,68 @@ static void fill_coding_method_array(sb_int8_array tone_level_idx, } tone_level_idx_temp[ch][sb][0] = tone_level_idx_temp[ch][sb][1]; } - acc = 0; - for (ch = 0; ch < nb_channels; ch++) - for (sb = 0; sb < 30; sb++) - for (j = 0; j < 64; j++) - acc += tone_level_idx_temp[ch][sb][j]; - - multres = 0x66666667LL * (acc * 10); - esp_40 = (multres >> 32) / 8 + ((multres & 0xffffffff) >> 31); - for (ch = 0; ch < nb_channels; ch++) - for (sb = 0; sb < 30; sb++) - for (j = 0; j < 64; j++) { - comp = tone_level_idx_temp[ch][sb][j]* esp_40 * 10; - if (comp < 0) - comp += 0xff; - comp /= 256; // signed shift - switch(sb) { - case 0: - if (comp < 30) - comp = 30; - comp += 15; - break; - case 1: - if (comp < 24) - comp = 24; - comp += 10; - break; - case 2: - case 3: - case 4: - if (comp < 16) - comp = 16; - } - if (comp <= 5) - tmp = 0; - else if (comp <= 10) - tmp = 10; - else if (comp <= 16) - tmp = 16; - else if (comp <= 24) - tmp = -1; - else - tmp = 0; - coding_method[ch][sb][j] = ((tmp & 0xfffa) + 30 )& 0xff; + } + acc = 0; + for (ch = 0; ch < nb_channels; ch++) + for (sb = 0; sb < 30; sb++) + for (j = 0; j < 64; j++) + acc += tone_level_idx_temp[ch][sb][j]; + + multres = 0x66666667LL * (acc * 10); + esp_40 = (multres >> 32) / 8 + ((multres & 0xffffffff) >> 31); + for (ch = 0; ch < nb_channels; ch++) + for (sb = 0; sb < 30; sb++) + for (j = 0; j < 64; j++) { + comp = tone_level_idx_temp[ch][sb][j]* esp_40 * 10; + if (comp < 0) + comp += 0xff; + comp /= 256; // signed shift + switch(sb) { + case 0: + if (comp < 30) + comp = 30; + comp += 15; + break; + case 1: + if (comp < 24) + comp = 24; + comp += 10; + break; + case 2: + case 3: + case 4: + if (comp < 16) + comp = 16; } + if (comp <= 5) + tmp = 0; + else if (comp <= 10) + tmp = 10; + else if (comp <= 16) + tmp = 16; + else if (comp <= 24) + tmp = -1; + else + tmp = 0; + coding_method[ch][sb][j] = ((tmp & 0xfffa) + 30 )& 0xff; + } + for (sb = 0; sb < 30; sb++) + fix_coding_method_array(sb, nb_channels, coding_method); + for (ch = 0; ch < nb_channels; ch++) for (sb = 0; sb < 30; sb++) - fix_coding_method_array(sb, nb_channels, coding_method); - for (ch = 0; ch < nb_channels; ch++) - for (sb = 0; sb < 30; sb++) - for (j = 0; j < 64; j++) - if (sb >= 10) { - if (coding_method[ch][sb][j] < 10) - coding_method[ch][sb][j] = 10; + for (j = 0; j < 64; j++) + if (sb >= 10) { + if (coding_method[ch][sb][j] < 10) + coding_method[ch][sb][j] = 10; + } else { + if (sb >= 2) { + if (coding_method[ch][sb][j] < 16) + coding_method[ch][sb][j] = 16; } else { - if (sb >= 2) { - if (coding_method[ch][sb][j] < 16) - coding_method[ch][sb][j] = 16; - } else { - if (coding_method[ch][sb][j] < 30) - coding_method[ch][sb][j] = 30; - } + if (coding_method[ch][sb][j] < 30) + coding_method[ch][sb][j] = 30; } + } } else { // superblocktype_2_3 != 0 for (ch = 0; ch < nb_channels; ch++) for (sb = 0; sb < 30; sb++) |