| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * This file is part of FFmpeg. | ||
| 3 | * | ||
| 4 | * FFmpeg is free software; you can redistribute it and/or | ||
| 5 | * modify it under the terms of the GNU Lesser General Public | ||
| 6 | * License as published by the Free Software Foundation; either | ||
| 7 | * version 2.1 of the License, or (at your option) any later version. | ||
| 8 | * | ||
| 9 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 12 | * Lesser General Public License for more details. | ||
| 13 | * | ||
| 14 | * You should have received a copy of the GNU Lesser General Public | ||
| 15 | * License along with FFmpeg; if not, write to the Free Software | ||
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 17 | */ | ||
| 18 | |||
| 19 | #include "libavutil/rational.h" | ||
| 20 | |||
| 21 | #include "mpeg12.h" | ||
| 22 | #include "mpeg12data.h" | ||
| 23 | |||
| 24 | const AVRational ff_mpeg12_frame_rate_tab[16] = { | ||
| 25 | { 0, 0}, | ||
| 26 | {24000, 1001}, | ||
| 27 | { 24, 1}, | ||
| 28 | { 25, 1}, | ||
| 29 | {30000, 1001}, | ||
| 30 | { 30, 1}, | ||
| 31 | { 50, 1}, | ||
| 32 | {60000, 1001}, | ||
| 33 | { 60, 1}, | ||
| 34 | // Xing's 15fps: (9) | ||
| 35 | { 15, 1}, | ||
| 36 | // libmpeg3's "Unofficial economy rates": (10-13) | ||
| 37 | { 5, 1}, | ||
| 38 | { 10, 1}, | ||
| 39 | { 12, 1}, | ||
| 40 | { 15, 1}, | ||
| 41 | { 0, 0}, | ||
| 42 | }; | ||
| 43 | |||
| 44 | 183 | void ff_mpeg12_find_best_frame_rate(AVRational frame_rate, | |
| 45 | int *code, int *ext_n, int *ext_d, | ||
| 46 | int nonstandard) | ||
| 47 | { | ||
| 48 |
2/4✓ Branch 0 taken 183 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 183 times.
✗ Branch 3 not taken.
|
183 | int mpeg2 = ext_n && ext_d; |
| 49 |
1/2✗ Branch 0 not taken.
✓ Branch 1 taken 183 times.
|
183 | int max_code = nonstandard ? 12 : 8; |
| 50 | int c, n, d, best_c, best_n, best_d; | ||
| 51 | 183 | AVRational best_error = { INT_MAX, 1 }; | |
| 52 | |||
| 53 | // Default to NTSC if the inputs make no sense. | ||
| 54 | 183 | best_c = 4; | |
| 55 | 183 | best_n = best_d = 1; | |
| 56 | |||
| 57 |
2/2✓ Branch 0 taken 1436 times.
✓ Branch 1 taken 175 times.
|
1611 | for (c = 1; c <= max_code; c++) { |
| 58 |
2/2✓ Branch 1 taken 8 times.
✓ Branch 2 taken 1428 times.
|
1436 | if (av_cmp_q(frame_rate, ff_mpeg12_frame_rate_tab[c]) == 0) { |
| 59 | 8 | best_c = c; | |
| 60 | 8 | goto found; | |
| 61 | } | ||
| 62 | } | ||
| 63 | |||
| 64 |
2/2✓ Branch 0 taken 1364 times.
✓ Branch 1 taken 165 times.
|
1529 | for (c = 1; c <= max_code; c++) { |
| 65 |
3/4✓ Branch 0 taken 6797 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 5443 times.
✓ Branch 3 taken 1354 times.
|
6797 | for (n = 1; n <= (mpeg2 ? 4 : 1); n++) { |
| 66 |
3/4✓ Branch 0 taken 179339 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 173906 times.
✓ Branch 3 taken 5433 times.
|
179339 | for (d = 1; d <= (mpeg2 ? 32 : 1); d++) { |
| 67 | AVRational test, error; | ||
| 68 | int cmp; | ||
| 69 | |||
| 70 | 173906 | test = av_mul_q(ff_mpeg12_frame_rate_tab[c], | |
| 71 | 173906 | (AVRational) { n, d }); | |
| 72 | |||
| 73 | 173906 | cmp = av_cmp_q(test, frame_rate); | |
| 74 |
2/2✓ Branch 0 taken 10 times.
✓ Branch 1 taken 173896 times.
|
173906 | if (cmp == 0) { |
| 75 | 10 | best_c = c; | |
| 76 | 10 | best_n = n; | |
| 77 | 10 | best_d = d; | |
| 78 | 10 | goto found; | |
| 79 | } | ||
| 80 | |||
| 81 |
2/2✓ Branch 0 taken 96555 times.
✓ Branch 1 taken 77341 times.
|
173896 | if (cmp < 0) |
| 82 | 96555 | error = av_div_q(frame_rate, test); | |
| 83 | else | ||
| 84 | 77341 | error = av_div_q(test, frame_rate); | |
| 85 | |||
| 86 | 173896 | cmp = av_cmp_q(error, best_error); | |
| 87 |
8/8✓ Branch 0 taken 170477 times.
✓ Branch 1 taken 3419 times.
✓ Branch 2 taken 138 times.
✓ Branch 3 taken 170339 times.
✓ Branch 4 taken 12 times.
✓ Branch 5 taken 126 times.
✓ Branch 6 taken 6 times.
✓ Branch 7 taken 6 times.
|
173896 | if (cmp < 0 || (cmp == 0 && n == 1 && d == 1)) { |
| 88 | 3425 | best_c = c; | |
| 89 | 3425 | best_n = n; | |
| 90 | 3425 | best_d = d; | |
| 91 | 3425 | best_error = error; | |
| 92 | } | ||
| 93 | } | ||
| 94 | } | ||
| 95 | } | ||
| 96 | |||
| 97 | 165 | found: | |
| 98 | 183 | *code = best_c; | |
| 99 |
1/2✓ Branch 0 taken 183 times.
✗ Branch 1 not taken.
|
183 | if (mpeg2) { |
| 100 | 183 | *ext_n = best_n - 1; | |
| 101 | 183 | *ext_d = best_d - 1; | |
| 102 | } | ||
| 103 | 183 | } | |
| 104 |