| /* |
| * H.264 encoder |
| * |
| * This file is part of FFmpeg. |
| * |
| * 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. |
| * |
| * 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| |
| #include "libavutil/common.h" |
| #include "bitstream.h" |
| #include "mpegvideo.h" |
| #include "h264data.h" |
| |
| /** |
| * Write out the provided data into a NAL unit. |
| * @param nal_ref_idc NAL reference IDC |
| * @param nal_unit_type NAL unit payload type |
| * @param dest the target buffer, dst+1 == src is allowed as a special case |
| * @param destsize the length of the dst array |
| * @param b2 the data which should be escaped |
| * @returns pointer to current position in the output buffer or NULL if an error occurred |
| */ |
| static uint8_t *h264_write_nal_unit(int nal_ref_idc, int nal_unit_type, uint8_t *dest, int *destsize, |
| PutBitContext *b2) |
| { |
| PutBitContext b; |
| int i, destpos, rbsplen, escape_count; |
| uint8_t *rbsp; |
| |
| if (nal_unit_type != NAL_END_STREAM) |
| put_bits(b2,1,1); // rbsp_stop_bit |
| |
| // Align b2 on a byte boundary |
| align_put_bits(b2); |
| rbsplen = put_bits_count(b2)/8; |
| flush_put_bits(b2); |
| rbsp = b2->buf; |
| |
| init_put_bits(&b,dest,*destsize); |
| |
| put_bits(&b,16,0); |
| put_bits(&b,16,0x01); |
| |
| put_bits(&b,1,0); // forbidden zero bit |
| put_bits(&b,2,nal_ref_idc); // nal_ref_idc |
| put_bits(&b,5,nal_unit_type); // nal_unit_type |
| |
| flush_put_bits(&b); |
| |
| destpos = 5; |
| escape_count= 0; |
| |
| for (i=0; i<rbsplen; i+=2) |
| { |
| if (rbsp[i]) continue; |
| if (i>0 && rbsp[i-1]==0) |
| i--; |
| if (i+2<rbsplen && rbsp[i+1]==0 && rbsp[i+2]<=3) |
| { |
| escape_count++; |
| i+=2; |
| } |
| } |
| |
| if(escape_count==0) |
| { |
| if(dest+destpos != rbsp) |
| { |
| memcpy(dest+destpos, rbsp, rbsplen); |
| *destsize -= (rbsplen+destpos); |
| } |
| return dest+rbsplen+destpos; |
| } |
| |
| if(rbsplen + escape_count + 1> *destsize) |
| { |
| av_log(NULL, AV_LOG_ERROR, "Destination buffer too small!\n"); |
| return NULL; |
| } |
| |
| // this should be damn rare (hopefully) |
| for (i = 0 ; i < rbsplen ; i++) |
| { |
| if (i + 2 < rbsplen && (rbsp[i] == 0 && rbsp[i+1] == 0 && rbsp[i+2] < 4)) |
| { |
| dest[destpos++] = rbsp[i++]; |
| dest[destpos++] = rbsp[i]; |
| dest[destpos++] = 0x03; // emulation prevention byte |
| } |
| else |
| dest[destpos++] = rbsp[i]; |
| } |
| *destsize -= destpos; |
| return dest+destpos; |
| } |
| |
| static const uint8_t pict_type_to_golomb[7] = {-1, 2, 0, 1, -1, 4, 3}; |
| |
| static const uint8_t intra4x4_cbp_to_golomb[48] = { |
| 3, 29, 30, 17, 31, 18, 37, 8, 32, 38, 19, 9, 20, 10, 11, 2, |
| 16, 33, 34, 21, 35, 22, 39, 4, 36, 40, 23, 5, 24, 6, 7, 1, |
| 41, 42, 43, 25, 44, 26, 46, 12, 45, 47, 27, 13, 28, 14, 15, 0 |
| }; |
| |
| static const uint8_t inter_cbp_to_golomb[48] = { |
| 0, 2, 3, 7, 4, 8, 17, 13, 5, 18, 9, 14, 10, 15, 16, 11, |
| 1, 32, 33, 36, 34, 37, 44, 40, 35, 45, 38, 41, 39, 42, 43, 19, |
| 6, 24, 25, 20, 26, 21, 46, 28, 27, 47, 22, 29, 23, 30, 31, 12 |
| }; |
| |
| #define QUANT_SHIFT 22 |
| |
| static const int quant_coeff[52][16] = { |
| { 419430, 258111, 419430, 258111, 258111, 167772, 258111, 167772, 419430, 258111, 419430, 258111, 258111, 167772, 258111, 167772,}, |
| { 381300, 239675, 381300, 239675, 239675, 149131, 239675, 149131, 381300, 239675, 381300, 239675, 239675, 149131, 239675, 149131,}, |
| { 322639, 209715, 322639, 209715, 209715, 134218, 209715, 134218, 322639, 209715, 322639, 209715, 209715, 134218, 209715, 134218,}, |
| { 299593, 186414, 299593, 186414, 186414, 116711, 186414, 116711, 299593, 186414, 299593, 186414, 186414, 116711, 186414, 116711,}, |
| { 262144, 167772, 262144, 167772, 167772, 107374, 167772, 107374, 262144, 167772, 262144, 167772, 167772, 107374, 167772, 107374,}, |
| { 233017, 145889, 233017, 145889, 145889, 92564, 145889, 92564, 233017, 145889, 233017, 145889, 145889, 92564, 145889, 92564,}, |
| { 209715, 129056, 209715, 129056, 129056, 83886, 129056, 83886, 209715, 129056, 209715, 129056, 129056, 83886, 129056, 83886,}, |
| { 190650, 119837, 190650, 119837, 119837, 74565, 119837, 74565, 190650, 119837, 190650, 119837, 119837, 74565, 119837, 74565,}, |
| { 161319, 104858, 161319, 104858, 104858, 67109, 104858, 67109, 161319, 104858, 161319, 104858, 104858, 67109, 104858, 67109,}, |
| { 149797, 93207, 149797, 93207, 93207, 58356, 93207, 58356, 149797, 93207, 149797, 93207, 93207, 58356, 93207, 58356,}, |
| { 131072, 83886, 131072, 83886, 83886, 53687, 83886, 53687, 131072, 83886, 131072, 83886, 83886, 53687, 83886, 53687,}, |
| { 116508, 72944, 116508, 72944, 72944, 46282, 72944, 46282, 116508, 72944, 116508, 72944, 72944, 46282, 72944, 46282,}, |
| { 104858, 64528, 104858, 64528, 64528, 41943, 64528, 41943, 104858, 64528, 104858, 64528, 64528, 41943, 64528, 41943,}, |
| { 95325, 59919, 95325, 59919, 59919, 37283, 59919, 37283, 95325, 59919, 95325, 59919, 59919, 37283, 59919, 37283,}, |
| { 80660, 52429, 80660, 52429, 52429, 33554, 52429, 33554, 80660, 52429, 80660, 52429, 52429, 33554, 52429, 33554,}, |
| { 74898, 46603, 74898, 46603, 46603, 29178, 46603, 29178, 74898, 46603, 74898, 46603, 46603, 29178, 46603, 29178,}, |
| { 65536, 41943, 65536, 41943, 41943, 26844, 41943, 26844, 65536, 41943, 65536, 41943, 41943, 26844, 41943, 26844,}, |
| { 58254, 36472, 58254, 36472, 36472, 23141, 36472, 23141, 58254, 36472, 58254, 36472, 36472, 23141, 36472, 23141,}, |
| { 52429, 32264, 52429, 32264, 32264, 20972, 32264, 20972, 52429, 32264, 52429, 32264, 32264, 20972, 32264, 20972,}, |
| { 47663, 29959, 47663, 29959, 29959, 18641, 29959, 18641, 47663, 29959, 47663, 29959, 29959, 18641, 29959, 18641,}, |
| { 40330, 26214, 40330, 26214, 26214, 16777, 26214, 16777, 40330, 26214, 40330, 26214, 26214, 16777, 26214, 16777,}, |
| { 37449, 23302, 37449, 23302, 23302, 14589, 23302, 14589, 37449, 23302, 37449, 23302, 23302, 14589, 23302, 14589,}, |
| { 32768, 20972, 32768, 20972, 20972, 13422, 20972, 13422, 32768, 20972, 32768, 20972, 20972, 13422, 20972, 13422,}, |
| { 29127, 18236, 29127, 18236, 18236, 11570, 18236, 11570, 29127, 18236, 29127, 18236, 18236, 11570, 18236, 11570,}, |
| { 26214, 16132, 26214, 16132, 16132, 10486, 16132, 10486, 26214, 16132, 26214, 16132, 16132, 10486, 16132, 10486,}, |
| { 23831, 14980, 23831, 14980, 14980, 9321, 14980, 9321, 23831, 14980, 23831, 14980, 14980, 9321, 14980, 9321,}, |
| { 20165, 13107, 20165, 13107, 13107, 8389, 13107, 8389, 20165, 13107, 20165, 13107, 13107, 8389, 13107, 8389,}, |
| { 18725, 11651, 18725, 11651, 11651, 7294, 11651, 7294, 18725, 11651, 18725, 11651, 11651, 7294, 11651, 7294,}, |
| { 16384, 10486, 16384, 10486, 10486, 6711, 10486, 6711, 16384, 10486, 16384, 10486, 10486, 6711, 10486, 6711,}, |
| { 14564, 9118, 14564, 9118, 9118, 5785, 9118, 5785, 14564, 9118, 14564, 9118, 9118, 5785, 9118, 5785,}, |
| { 13107, 8066, 13107, 8066, 8066, 5243, 8066, 5243, 13107, 8066, 13107, 8066, 8066, 5243, 8066, 5243,}, |
| { 11916, 7490, 11916, 7490, 7490, 4660, 7490, 4660, 11916, 7490, 11916, 7490, 7490, 4660, 7490, 4660,}, |
| { 10082, 6554, 10082, 6554, 6554, 4194, 6554, 4194, 10082, 6554, 10082, 6554, 6554, 4194, 6554, 4194,}, |
| { 9362, 5825, 9362, 5825, 5825, 3647, 5825, 3647, 9362, 5825, 9362, 5825, 5825, 3647, 5825, 3647,}, |
| { 8192, 5243, 8192, 5243, 5243, 3355, 5243, 3355, 8192, 5243, 8192, 5243, 5243, 3355, 5243, 3355,}, |
| { 7282, 4559, 7282, 4559, 4559, 2893, 4559, 2893, 7282, 4559, 7282, 4559, 4559, 2893, 4559, 2893,}, |
| { 6554, 4033, 6554, 4033, 4033, 2621, 4033, 2621, 6554, 4033, 6554, 4033, 4033, 2621, 4033, 2621,}, |
| { 5958, 3745, 5958, 3745, 3745, 2330, 3745, 2330, 5958, 3745, 5958, 3745, 3745, 2330, 3745, 2330,}, |
| { 5041, 3277, 5041, 3277, 3277, 2097, 3277, 2097, 5041, 3277, 5041, 3277, 3277, 2097, 3277, 2097,}, |
| { 4681, 2913, 4681, 2913, 2913, 1824, 2913, 1824, 4681, 2913, 4681, 2913, 2913, 1824, 2913, 1824,}, |
| { 4096, 2621, 4096, 2621, 2621, 1678, 2621, 1678, 4096, 2621, 4096, 2621, 2621, 1678, 2621, 1678,}, |
| { 3641, 2280, 3641, 2280, 2280, 1446, 2280, 1446, 3641, 2280, 3641, 2280, 2280, 1446, 2280, 1446,}, |
| { 3277, 2016, 3277, 2016, 2016, 1311, 2016, 1311, 3277, 2016, 3277, 2016, 2016, 1311, 2016, 1311,}, |
| { 2979, 1872, 2979, 1872, 1872, 1165, 1872, 1165, 2979, 1872, 2979, 1872, 1872, 1165, 1872, 1165,}, |
| { 2521, 1638, 2521, 1638, 1638, 1049, 1638, 1049, 2521, 1638, 2521, 1638, 1638, 1049, 1638, 1049,}, |
| { 2341, 1456, 2341, 1456, 1456, 912, 1456, 912, 2341, 1456, 2341, 1456, 1456, 912, 1456, 912,}, |
| { 2048, 1311, 2048, 1311, 1311, 839, 1311, 839, 2048, 1311, 2048, 1311, 1311, 839, 1311, 839,}, |
| { 1820, 1140, 1820, 1140, 1140, 723, 1140, 723, 1820, 1140, 1820, 1140, 1140, 723, 1140, 723,}, |
| { 1638, 1008, 1638, 1008, 1008, 655, 1008, 655, 1638, 1008, 1638, 1008, 1008, 655, 1008, 655,}, |
| { 1489, 936, 1489, 936, 936, 583, 936, 583, 1489, 936, 1489, 936, 936, 583, 936, 583,}, |
| { 1260, 819, 1260, 819, 819, 524, 819, 524, 1260, 819, 1260, 819, 819, 524, 819, 524,}, |
| { 1170, 728, 1170, 728, 728, 456, 728, 456, 1170, 728, 1170, 728, 728, 456, 728, 456,}, |
| }; |
| |
| //FIXME need to check that this does not overflow signed 32 bit for low qp, I am not sure, it's very close |
| //FIXME check that gcc inlines this (and optimizes intra & separate_dc stuff away) |
| static inline int quantize_c(DCTELEM *block, uint8_t *scantable, int qscale, |
| int intra, int separate_dc) |
| { |
| int i; |
| const int * const quant_3Btable = quant_coeff[qscale]; |
| const int bias = intra ? (1 << QUANT_SHIFT) / 3 : (1 << QUANT_SHIFT) / 6; |
| const unsigned int threshold1 = (1 << QUANT_SHIFT) - bias - 1; |
| const unsigned int threshold2 = (threshold1 << 1); |
| int last_non_zero; |
| |
| if (separate_dc) { |
| if (qscale <= 18) { |
| //avoid overflows |
| const int dc_bias = intra ? (1 << (QUANT_SHIFT - 2)) / 3 : (1 << (QUANT_SHIFT - 2)) / 6; |
| const unsigned int dc_threshold1 = (1 << (QUANT_SHIFT - 2)) - dc_bias - 1; |
| const unsigned int dc_threshold2 = (dc_threshold1 << 1); |
| |
| int level = block[0]*quant_coeff[qscale+18][0]; |
| if (((unsigned)(level + dc_threshold1)) > dc_threshold2) { |
| if (level > 0) { |
| level = (dc_bias + level) >> (QUANT_SHIFT - 2); |
| block[0] = level; |
| } else { |
| level = (dc_bias - level) >> (QUANT_SHIFT - 2); |
| block[0] = -level; |
| } |
| // last_non_zero = i; |
| } else { |
| block[0] = 0; |
| } |
| } else { |
| const int dc_bias = intra ? (1 << (QUANT_SHIFT + 1)) / 3 : (1 << (QUANT_SHIFT + 1)) / 6; |
| const unsigned int dc_threshold1 = (1 << (QUANT_SHIFT + 1)) - dc_bias - 1; |
| const unsigned int dc_threshold2 = (dc_threshold1 << 1); |
| |
| int level = block[0]*quant_table[0]; |
| if (((unsigned)(level + dc_threshold1)) > dc_threshold2) { |
| if (level > 0) { |
| level = (dc_bias + level) >> (QUANT_SHIFT + 1); |
| block[0] = level; |
| } else { |
| level = (dc_bias - level) >> (QUANT_SHIFT + 1); |
| block[0] = -level; |
| } |
| // last_non_zero = i; |
| } else { |
| block[0] = 0; |
| } |
| } |
| last_non_zero = 0; |
| i = 1; |
| } else { |
| last_non_zero = -1; |
| i = 0; |
| } |
| |
| for (; i < 16; i++) { |
| const int j = scantable[i]; |
| int level = block[j]*quant_table[j]; |
| |
| // if ( bias+level >= (1 << (QMAT_SHIFT - 3)) |
| // || bias-level >= (1 << (QMAT_SHIFT - 3))) { |
| if (((unsigned)(level + threshold1)) > threshold2) { |
| if (level > 0) { |
| level = (bias + level) >> QUANT_SHIFT; |
| block[j] = level; |
| } else { |
| level = (bias - level) >> QUANT_SHIFT; |
| block[j] = -level; |
| } |
| last_non_zero = i; |
| } else { |
| block[j] = 0; |
| } |
| } |
| |
| return last_non_zero; |
| } |
