diff options
author | Alex Converse <alex.converse@gmail.com> | 2010-03-10 00:29:43 +0300 |
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committer | Alex Converse <alex.converse@gmail.com> | 2010-03-10 00:29:43 +0300 |
commit | ac8d655a79e6699bd377ec97ae988587b7d2e9dd (patch) | |
tree | 15c13c058e5ce1e0ab128df9131c2dd44270bd77 /libavcodec/aacsbr.c | |
parent | ecc1f8c3c8875e31e7cb9b7d9229b1674e1be736 (diff) |
aacsbr: read bs_rel_bord directly into t_env.
Originally committed as revision 22410 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/aacsbr.c')
-rw-r--r-- | libavcodec/aacsbr.c | 47 |
1 files changed, 19 insertions, 28 deletions
diff --git a/libavcodec/aacsbr.c b/libavcodec/aacsbr.c index 32dec00ac2..8ca2403cfb 100644 --- a/libavcodec/aacsbr.c +++ b/libavcodec/aacsbr.c @@ -619,15 +619,14 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr, { int i; unsigned bs_pointer; - int abs_bord_lead = 0; // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots int abs_bord_trail = 16; int num_rel_lead, num_rel_trail; unsigned bs_num_env_old = ch_data->bs_num_env; - uint8_t bs_rel_bord[2][3]; ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env]; ch_data->bs_amp_res = sbr->bs_amp_res_header; + ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old]; switch (ch_data->bs_frame_class = get_bits(gb, 2)) { case FIXFIX: @@ -643,6 +642,14 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr, return -1; } + ch_data->t_env[0] = 0; + ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; + + abs_bord_trail = (abs_bord_trail + (ch_data->bs_num_env >> 1)) / + ch_data->bs_num_env; + for (i = 0; i < num_rel_lead; i++) + ch_data->t_env[i + 1] = ch_data->t_env[i] + abs_bord_trail; + bs_pointer = 0; ch_data->bs_freq_res[1] = get_bits1(gb); @@ -654,9 +661,11 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr, num_rel_trail = get_bits(gb, 2); num_rel_lead = 0; ch_data->bs_num_env = num_rel_trail + 1; + ch_data->t_env[0] = 0; + ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; for (i = 0; i < num_rel_trail; i++) - bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2; + ch_data->t_env[ch_data->bs_num_env - 1 - i] = ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2; bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); @@ -664,23 +673,25 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr, ch_data->bs_freq_res[ch_data->bs_num_env - i] = get_bits1(gb); break; case VARFIX: - abs_bord_lead = get_bits(gb, 2); + ch_data->t_env[0] = get_bits(gb, 2); num_rel_lead = get_bits(gb, 2); ch_data->bs_num_env = num_rel_lead + 1; + ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; for (i = 0; i < num_rel_lead; i++) - bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2; + ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2; bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env); break; case VARVAR: - abs_bord_lead = get_bits(gb, 2); + ch_data->t_env[0] = get_bits(gb, 2); abs_bord_trail += get_bits(gb, 2); num_rel_lead = get_bits(gb, 2); num_rel_trail = get_bits(gb, 2); ch_data->bs_num_env = num_rel_lead + num_rel_trail + 1; + ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; if (ch_data->bs_num_env > 5) { av_log(ac->avccontext, AV_LOG_ERROR, @@ -690,9 +701,9 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr, } for (i = 0; i < num_rel_lead; i++) - bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2; + ch_data->t_env[i + 1] = ch_data->t_env[i] + 2 * get_bits(gb, 2) + 2; for (i = 0; i < num_rel_trail; i++) - bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2; + ch_data->t_env[ch_data->bs_num_env - 1 - i] = ch_data->t_env[ch_data->bs_num_env - i] - 2 * get_bits(gb, 2) - 2; bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env]); @@ -707,26 +718,6 @@ static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr, return -1; } - ch_data->t_env_num_env_old = ch_data->t_env[bs_num_env_old]; - ch_data->t_env[0] = abs_bord_lead; - ch_data->t_env[ch_data->bs_num_env] = abs_bord_trail; - - if (ch_data->bs_frame_class == FIXFIX) { - int temp = (abs_bord_trail + (ch_data->bs_num_env >> 1)) / - ch_data->bs_num_env; - for (i = 0; i < num_rel_lead; i++) - ch_data->t_env[i + 1] = ch_data->t_env[i] + temp; - } else if (ch_data->bs_frame_class > 1) { // VARFIX or VARVAR - for (i = 0; i < num_rel_lead; i++) - ch_data->t_env[i + 1] = ch_data->t_env[i] + bs_rel_bord[0][i]; - } - - if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR - for (i = ch_data->bs_num_env - 1; i > num_rel_lead; i--) - ch_data->t_env[i] = ch_data->t_env[i + 1] - - bs_rel_bord[1][ch_data->bs_num_env - 1 - i]; - } - ch_data->bs_num_noise = (ch_data->bs_num_env > 1) + 1; ch_data->t_q[0] = ch_data->t_env[0]; |