diff options
author | Mark Thompson <sw@jkqxz.net> | 2017-09-13 00:11:56 +0300 |
---|---|---|
committer | Mark Thompson <sw@jkqxz.net> | 2017-10-17 22:56:30 +0300 |
commit | 278c308ceae6b8d7bac1dfc24518821aae603988 (patch) | |
tree | 3117d01acfc7268aed67db95eb4c7f98fe2511cb /libavcodec/tests | |
parent | 03f982bbca4211108477e772db9a339517ecde37 (diff) |
mpeg12: Add a common function to find the best frame rate
This will be used later in both the mpeg2_metadata filter and the
VAAPI MPEG-2 encoder. Also adds a unit test.
(cherry picked from commit b5859e0b04bdbe12c97cb12ac10a45d51d2d73c9)
Diffstat (limited to 'libavcodec/tests')
-rw-r--r-- | libavcodec/tests/mpeg12framerate.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/libavcodec/tests/mpeg12framerate.c b/libavcodec/tests/mpeg12framerate.c new file mode 100644 index 0000000000..595bdb278a --- /dev/null +++ b/libavcodec/tests/mpeg12framerate.c @@ -0,0 +1,87 @@ +/* + * 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 "libavcodec/mpeg12.h" +#include "libavcodec/mpeg12data.h" + +int main(void) +{ + int i; + +#define TEST_MATCH(frame_rate, code, ext_n, ext_d) do { \ + AVRational fr = frame_rate; \ + int c, n, d; \ + ff_mpeg12_find_best_frame_rate(fr, &c, &n, &d, 0); \ + if (c != code || n != ext_n || d != ext_d) { \ + av_log(NULL, AV_LOG_ERROR, "Failed to match %d/%d: " \ + "code = %d, ext_n = %d, ext_d = %d.\n", \ + fr.num, fr.den, c, n, d); \ + return 1; \ + } \ + } while (0) +#define TEST_EXACT(frn, frd) do { \ + AVRational fr = (AVRational) { frn, frd }; \ + int c, n, d; \ + ff_mpeg12_find_best_frame_rate(fr, &c, &n, &d, 0); \ + if (av_cmp_q(fr, av_mul_q(ff_mpeg12_frame_rate_tab[c], \ + (AVRational) { n + 1, d + 1 })) != 0) { \ + av_log(NULL, AV_LOG_ERROR, "Failed to find exact %d/%d: " \ + "code = %d, ext_n = %d, ext_d = %d.\n", \ + fr.num, fr.den, c, n, d); \ + return 1; \ + } \ + } while (0) + + // Framerates in the table must be chosen exactly. + for (i = 1; i <= 8; i++) + TEST_MATCH(ff_mpeg12_frame_rate_tab[i], i, 0, 0); + + // As should the same ones with small perturbations. + // (1/1000 used here to be smaller than half the difference + // between 24 and 24000/1001.) + for (i = 1; i <= 8; i++) { + TEST_MATCH(av_sub_q(ff_mpeg12_frame_rate_tab[i], + (AVRational) { 1, 1000 }), i, 0, 0); + TEST_MATCH(av_add_q(ff_mpeg12_frame_rate_tab[i], + (AVRational) { 1, 1000 }), i, 0, 0); + } + + // Exactly constructable framerates should be exact. Note that some + // values can be made in multiple ways (e.g. 12 = 24 / 2 == 60 / 5), + // and there is no reason to favour any particular choice. + TEST_EXACT( 1, 1); + TEST_EXACT( 2, 1); + TEST_EXACT( 12, 1); + TEST_EXACT( 15000, 1001); + TEST_EXACT( 15, 1); + TEST_EXACT( 120, 1); + TEST_EXACT(120000, 1001); + TEST_EXACT( 200, 1); + TEST_EXACT( 240, 1); + + // Values higher than 240 (the highest representable, as 60 * 4 / 1) + // should be mapped to 240. + for (i = 240; i < 1000; i += 10) + TEST_MATCH(((AVRational) { i, 1 }), 8, 3, 0); + // Values lower than 24000/32032 (the lowest representable, as + // 24000/1001 * 1 / 32) should be mapped to 24000/32032. + for (i = 74; i > 0; i--) + TEST_MATCH(((AVRational) { i, 100 }), 1, 0, 31); + + return 0; +} |