diff options
Diffstat (limited to 'libavcodec/cfhddata.c')
| -rw-r--r-- | libavcodec/cfhddata.c | 134 |
1 files changed, 84 insertions, 50 deletions
diff --git a/libavcodec/cfhddata.c b/libavcodec/cfhddata.c index 3a9d6bdfb9..5df68d4b3c 100644 --- a/libavcodec/cfhddata.c +++ b/libavcodec/cfhddata.c @@ -1,20 +1,20 @@ /* * Copyright (c) 2015 Kieran Kunhya * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -24,6 +24,14 @@ #include "cfhd.h" +/* some special codewords, not sure what they all mean */ +#define TABLE_9_BAND_END1 0x1C7859Eh +#define TABLE_9_BAND_END_LEN1 25 +#define TABLE_9_BAND_END2 0x38F0B3Fh +#define TABLE_9_BAND_END_LEN2 26 +#define TABLE_9_BAND_END3 0x38F0B3Eh +#define TABLE_9_BAND_END_LEN3 26 + #define NB_VLC_TABLE_9 (71 + 3) #define NB_VLC_TABLE_18 (263 + 1) @@ -265,73 +273,99 @@ static const uint8_t table_18_vlc_level[NB_VLC_TABLE_18] = { 220, 195, 161, 231, 173, 226, 116, 255, }; -static int init_vlc_signed(VLC *vlc, CFHD_RL_VLC_ELEM table_rl_vlc[], - unsigned bound, - const uint32_t table_vlc_bits[], - const uint8_t table_vlc_len[], - const uint16_t table_vlc_run[], - const uint8_t table_vlc_level[]) +av_cold int ff_cfhd_init_vlcs(CFHDContext *s) { - uint32_t vlc_bits[NB_VLC_TABLE_18 * 2]; - uint8_t vlc_len[NB_VLC_TABLE_18 * 2]; - uint16_t vlc_run[NB_VLC_TABLE_18 * 2]; - int16_t vlc_level[NB_VLC_TABLE_18 * 2]; - unsigned i, j; - int ret; + int i, j, ret = 0; + uint32_t new_cfhd_vlc_bits[NB_VLC_TABLE_18 * 2]; + uint8_t new_cfhd_vlc_len[NB_VLC_TABLE_18 * 2]; + uint16_t new_cfhd_vlc_run[NB_VLC_TABLE_18 * 2]; + int16_t new_cfhd_vlc_level[NB_VLC_TABLE_18 * 2]; + + /** Similar to dv.c, generate signed VLC tables **/ - for (i = 0, j = 0; i < bound; i++, j++) { - vlc_bits[j] = table_vlc_bits[i]; - vlc_len[j] = table_vlc_len[i]; - vlc_run[j] = table_vlc_run[i]; - vlc_level[j] = table_vlc_level[i]; + /* Table 9 */ + for (i = 0, j = 0; i < NB_VLC_TABLE_9; i++, j++) { + new_cfhd_vlc_bits[j] = table_9_vlc_bits[i]; + new_cfhd_vlc_len[j] = table_9_vlc_len[i]; + new_cfhd_vlc_run[j] = table_9_vlc_run[i]; + new_cfhd_vlc_level[j] = table_9_vlc_level[i]; /* Don't include the zero level nor escape bits */ - if (table_vlc_level[i] && - vlc_bits[j] != table_vlc_bits[bound - 1]) { - vlc_bits[j] <<= 1; - vlc_len[j]++; + if (table_9_vlc_level[i] && + new_cfhd_vlc_bits[j] != table_9_vlc_bits[NB_VLC_TABLE_9-1]) { + new_cfhd_vlc_bits[j] <<= 1; + new_cfhd_vlc_len[j]++; j++; - vlc_bits[j] = (table_vlc_bits[i] << 1) | 1; - vlc_len[j] = table_vlc_len[i] + 1; - vlc_run[j] = table_vlc_run[i]; - vlc_level[j] = -table_vlc_level[i]; + new_cfhd_vlc_bits[j] = (table_9_vlc_bits[i] << 1) | 1; + new_cfhd_vlc_len[j] = table_9_vlc_len[i] + 1; + new_cfhd_vlc_run[j] = table_9_vlc_run[i]; + new_cfhd_vlc_level[j] = -table_9_vlc_level[i]; } } - if ((ret = init_vlc(vlc, VLC_BITS, j, vlc_len, 1, 1, vlc_bits, 4, 4, 0)) < 0) + ret = init_vlc(&s->vlc_9, VLC_BITS, j, new_cfhd_vlc_len, + 1, 1, new_cfhd_vlc_bits, 4, 4, 0); + if (ret < 0) return ret; - - for (i = 0; i < (*vlc).table_size; i++) { - int code = (*vlc).table[i][0]; - int len = (*vlc).table[i][1]; + for (i = 0; i < s->vlc_9.table_size; i++) { + int code = s->vlc_9.table[i][0]; + int len = s->vlc_9.table[i][1]; int level, run; if (len < 0) { // more bits needed run = 0; level = code; } else { - run = vlc_run[code]; - level = vlc_level[code]; + run = new_cfhd_vlc_run[code]; + level = new_cfhd_vlc_level[code]; } - table_rl_vlc[i].len = len; - table_rl_vlc[i].level = level; - table_rl_vlc[i].run = run; + s->table_9_rl_vlc[i].len = len; + s->table_9_rl_vlc[i].level = level; + s->table_9_rl_vlc[i].run = run; } - return 0; -} + /* Table 18 */ + for (i = 0, j = 0; i < NB_VLC_TABLE_18; i++, j++) { + new_cfhd_vlc_bits[j] = table_18_vlc_bits[i]; + new_cfhd_vlc_len[j] = table_18_vlc_len[i]; + new_cfhd_vlc_run[j] = table_18_vlc_run[i]; + new_cfhd_vlc_level[j] = table_18_vlc_level[i]; -av_cold int ff_cfhd_init_vlcs(CFHDContext *s) -{ - /** Similar to dv.c, generate signed VLC tables **/ + /* Don't include the zero level nor escape bits */ + if (table_18_vlc_level[i] && + new_cfhd_vlc_bits[j] != table_18_vlc_bits[NB_VLC_TABLE_18-1]) { + new_cfhd_vlc_bits[j] <<= 1; + new_cfhd_vlc_len[j]++; + j++; + new_cfhd_vlc_bits[j] = (table_18_vlc_bits[i] << 1) | 1; + new_cfhd_vlc_len[j] = table_18_vlc_len[i] + 1; + new_cfhd_vlc_run[j] = table_18_vlc_run[i]; + new_cfhd_vlc_level[j] = -table_18_vlc_level[i]; + } + } - int ret = init_vlc_signed(&s->vlc_9, s->table_9_rl_vlc, NB_VLC_TABLE_9, - table_9_vlc_bits, table_9_vlc_len, - table_9_vlc_run, table_9_vlc_level); + ret = init_vlc(&s->vlc_18, VLC_BITS, j, new_cfhd_vlc_len, + 1, 1, new_cfhd_vlc_bits, 4, 4, 0); if (ret < 0) return ret; + av_assert0(s->vlc_18.table_size == 4572); + + for (i = 0; i < s->vlc_18.table_size; i++) { + int code = s->vlc_18.table[i][0]; + int len = s->vlc_18.table[i][1]; + int level, run; + + if (len < 0) { // more bits needed + run = 0; + level = code; + } else { + run = new_cfhd_vlc_run[code]; + level = new_cfhd_vlc_level[code]; + } + s->table_18_rl_vlc[i].len = len; + s->table_18_rl_vlc[i].level = level; + s->table_18_rl_vlc[i].run = run; + } - return init_vlc_signed(&s->vlc_18, s->table_18_rl_vlc, NB_VLC_TABLE_18, - table_18_vlc_bits, table_18_vlc_len, - table_18_vlc_run, table_18_vlc_level); + return ret; } |