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mpv/test/chmap.c

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test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
#include "config.h"
various: remove av channel layout check
2024-06-21 16:24:30 +00:00
#include "audio/chmap.h"
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
#include "audio/chmap_avchannel.h"
various: remove av channel layout check
2024-06-21 16:24:30 +00:00
#include "audio/chmap_sel.h"
#include "test_utils.h"
test: make tests part of the mpv binary Until now, each .c file in test/ was built as separate, self-contained binary. Each binary could be run to execute the tests it contained. Change this and make them part of the normal mpv binary. Now the tests have to be invoked via the --unittest option. Do this for two reasons: - Tests now run within a "properly" initialized mpv instance, so all services are available. - Possibly simplifying the situation for future build systems. The first point is the main motivation. The mpv code is entangled with mp_log and the option system. It feels like a bad idea to duplicate some of the initialization of this just so you can call code using them. I'm also getting rid of cmocka. There wouldn't be any problem to keep it (it's a perfectly sane set of helpers), but NIH calls. I would have had to aggregate all tests into a CMUnitTest list, and I don't see how I'd get different types of entry points easily. Probably easily solvable, but since we made only pretty basic use of this library, NIH-ing this is actually easier (I needed a list of tests with custom metadata anyway, so all what was left was reimplement the assert_* helpers). Unit tests now don't output anything, and if they fail, they'll simply crash and leave a message that typically requires inspecting the test code to figure out what went wrong (and probably editing the test code to get more information). I even merged the various test functions into single ones. Sucks, but here you go. chmap_sel.c is merged into chmap.c, because I didn't see the point of this being separate. json.c drops the print_message() to go along with the new silent-by-default idea, also there's a memory leak fix unrelated to the rest of this commit. The new code is enabled with --enable-tests (--enable-test goes away). Due to waf's option parser, --enable-test still works, because it's a unique prefix to --enable-tests.
2019-11-07 21:42:14 +00:00
#define LAYOUTS(...) (char*[]){__VA_ARGS__, NULL}
static void test_sel(const char *input, const char *expected_selection,
char **layouts)
{
struct mp_chmap_sel s = {0};
struct mp_chmap input_map;
struct mp_chmap expected_map;
assert_true(mp_chmap_from_str(&input_map, bstr0(input)));
assert_true(mp_chmap_from_str(&expected_map, bstr0(expected_selection)));
for (int n = 0; layouts[n]; n++) {
struct mp_chmap tmp;
assert_true(mp_chmap_from_str(&tmp, bstr0(layouts[n])));
int count = s.num_chmaps;
mp_chmap_sel_add_map(&s, &tmp);
assert_true(s.num_chmaps > count); // assure validity and max. count
}
assert_true(mp_chmap_sel_fallback(&s, &input_map));
// We convert expected_map to a chmap and then back to a string to avoid
// problems with ambiguous layouts.
assert_string_equal(mp_chmap_to_str(&input_map),
mp_chmap_to_str(&expected_map));
}
chmap_sel: add multichannel fallback heuristic Instead of just failing during channel map selection, try to select a close layout that makes most sense and upmix/downmix to that instead of failing AO initialization. The heuristic is rather simple, and uses the following steps: 1) If mono is required always prefer stereo to a multichannel upmix. 2) Search for an upmix that is an exact superset of the required channel map. 3) Search for a downmix that is the exact subset of the required channel map. 4) Search for either an upmix or downmix that is the closest (minimum difference of channels) to the required channel map.
2014-12-28 08:38:22 +00:00
test/chmap: start adding AVChannelLayout unit tests The first set iterates through all standard FFmpeg layouts and checks that those which fit MP_NUM_CHANNELS succeed. The second set iterates through built-in named channel layouts, and attempts to convert them to AVChannelLayouts.
2022-06-12 11:12:53 +00:00
static bool layout_matches(const AVChannelLayout *av_layout,
const struct mp_chmap *mp_layout,
bool require_default_unspec)
{
if (!mp_chmap_is_valid(mp_layout) ||
!av_channel_layout_check(av_layout) ||
av_layout->nb_channels != mp_layout->num ||
mp_layout->num > MP_NUM_CHANNELS)
return false;
switch (av_layout->order) {
case AV_CHANNEL_ORDER_UNSPEC:
{
if (!require_default_unspec)
return true;
// mp_chmap essentially does not have a concept of "unspecified"
// so we check if the mp layout matches the default layout for such
// channel count.
struct mp_chmap default_layout = { 0 };
mp_chmap_from_channels(&default_layout, mp_layout->num);
return mp_chmap_equals(mp_layout, &default_layout);
}
case AV_CHANNEL_ORDER_NATIVE:
return av_layout->u.mask == mp_chmap_to_lavc(mp_layout);
default:
// TODO: handle custom layouts
return false;
}
return true;
}
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
static void test_mp_chmap_to_av_channel_layout(void)
test/chmap: start adding AVChannelLayout unit tests The first set iterates through all standard FFmpeg layouts and checks that those which fit MP_NUM_CHANNELS succeed. The second set iterates through built-in named channel layouts, and attempts to convert them to AVChannelLayouts.
2022-06-12 11:12:53 +00:00
{
mp_ch_layout_tuple *mapping_array = NULL;
void *iter = NULL;
bool anything_failed = false;
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
printf("Testing mp_chmap -> AVChannelLayout conversions\n");
test/chmap: start adding AVChannelLayout unit tests The first set iterates through all standard FFmpeg layouts and checks that those which fit MP_NUM_CHANNELS succeed. The second set iterates through built-in named channel layouts, and attempts to convert them to AVChannelLayouts.
2022-06-12 11:12:53 +00:00
while ((mapping_array = mp_iterate_builtin_layouts(&iter))) {
const char *mapping_name = (*mapping_array)[0];
const char *mapping_str = (*mapping_array)[1];
struct mp_chmap mp_layout = { 0 };
AVChannelLayout av_layout = { 0 };
char layout_desc[128] = {0};
assert_true(mp_chmap_from_str(&mp_layout, bstr0(mapping_str)));
mp_chmap_to_av_layout(&av_layout, &mp_layout);
assert_false(av_channel_layout_describe(&av_layout,
layout_desc, 128) < 0);
bool success =
(strcmp(layout_desc, mp_chmap_to_str(&mp_layout)) == 0 ||
layout_matches(&av_layout, &mp_layout, false));
if (!success)
anything_failed = true;
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
printf("%s: %s (%s) -> %s\n",
test/chmap: start adding AVChannelLayout unit tests The first set iterates through all standard FFmpeg layouts and checks that those which fit MP_NUM_CHANNELS succeed. The second set iterates through built-in named channel layouts, and attempts to convert them to AVChannelLayouts.
2022-06-12 11:12:53 +00:00
success ? "Success" : "Failure",
mapping_str, mapping_name, layout_desc);
av_channel_layout_uninit(&av_layout);
}
assert_false(anything_failed);
}
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
static void test_av_channel_layout_to_mp_chmap(void)
test/chmap: start adding AVChannelLayout unit tests The first set iterates through all standard FFmpeg layouts and checks that those which fit MP_NUM_CHANNELS succeed. The second set iterates through built-in named channel layouts, and attempts to convert them to AVChannelLayouts.
2022-06-12 11:12:53 +00:00
{
const AVChannelLayout *av_layout = NULL;
void *iter = NULL;
bool anything_failed = false;
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
printf("Testing AVChannelLayout -> mp_chmap conversions\n");
test/chmap: start adding AVChannelLayout unit tests The first set iterates through all standard FFmpeg layouts and checks that those which fit MP_NUM_CHANNELS succeed. The second set iterates through built-in named channel layouts, and attempts to convert them to AVChannelLayouts.
2022-06-12 11:12:53 +00:00
while ((av_layout = av_channel_layout_standard(&iter))) {
struct mp_chmap mp_layout = { 0 };
char layout_desc[128] = {0};
assert_false(av_channel_layout_describe(av_layout,
layout_desc, 128) < 0);
bool ret = mp_chmap_from_av_layout(&mp_layout, av_layout);
if (!ret) {
bool too_many_channels =
av_layout->nb_channels > MP_NUM_CHANNELS;
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
printf("Conversion from '%s' to mp_chmap failed (%s)!\n",
layout_desc,
too_many_channels ?
"channel count was over max, ignoring" :
"unexpected, failing");
test/chmap: start adding AVChannelLayout unit tests The first set iterates through all standard FFmpeg layouts and checks that those which fit MP_NUM_CHANNELS succeed. The second set iterates through built-in named channel layouts, and attempts to convert them to AVChannelLayouts.
2022-06-12 11:12:53 +00:00
// we should for now only fail with things such as 22.2
// due to mp_chmap being currently limited to 16 channels
assert_true(too_many_channels);
continue;
}
bool success =
(strcmp(layout_desc, mp_chmap_to_str(&mp_layout)) == 0 ||
layout_matches(av_layout, &mp_layout, true));
if (!success)
anything_failed = true;
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
printf("%s: %s -> %s\n",
test/chmap: start adding AVChannelLayout unit tests The first set iterates through all standard FFmpeg layouts and checks that those which fit MP_NUM_CHANNELS succeed. The second set iterates through built-in named channel layouts, and attempts to convert them to AVChannelLayouts.
2022-06-12 11:12:53 +00:00
success ? "Success" : "Failure",
layout_desc, mp_chmap_to_str(&mp_layout));
}
assert_false(anything_failed);
}
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
int main(void)
test: make tests part of the mpv binary Until now, each .c file in test/ was built as separate, self-contained binary. Each binary could be run to execute the tests it contained. Change this and make them part of the normal mpv binary. Now the tests have to be invoked via the --unittest option. Do this for two reasons: - Tests now run within a "properly" initialized mpv instance, so all services are available. - Possibly simplifying the situation for future build systems. The first point is the main motivation. The mpv code is entangled with mp_log and the option system. It feels like a bad idea to duplicate some of the initialization of this just so you can call code using them. I'm also getting rid of cmocka. There wouldn't be any problem to keep it (it's a perfectly sane set of helpers), but NIH calls. I would have had to aggregate all tests into a CMUnitTest list, and I don't see how I'd get different types of entry points easily. Probably easily solvable, but since we made only pretty basic use of this library, NIH-ing this is actually easier (I needed a list of tests with custom metadata anyway, so all what was left was reimplement the assert_* helpers). Unit tests now don't output anything, and if they fail, they'll simply crash and leave a message that typically requires inspecting the test code to figure out what went wrong (and probably editing the test code to get more information). I even merged the various test functions into single ones. Sucks, but here you go. chmap_sel.c is merged into chmap.c, because I didn't see the point of this being separate. json.c drops the print_message() to go along with the new silent-by-default idea, also there's a memory leak fix unrelated to the rest of this commit. The new code is enabled with --enable-tests (--enable-test goes away). Due to waf's option parser, --enable-test still works, because it's a unique prefix to --enable-tests.
2019-11-07 21:42:14 +00:00
{
chmap_sel: add multichannel fallback heuristic Instead of just failing during channel map selection, try to select a close layout that makes most sense and upmix/downmix to that instead of failing AO initialization. The heuristic is rather simple, and uses the following steps: 1) If mono is required always prefer stereo to a multichannel upmix. 2) Search for an upmix that is an exact superset of the required channel map. 3) Search for a downmix that is the exact subset of the required channel map. 4) Search for either an upmix or downmix that is the closest (minimum difference of channels) to the required channel map.
2014-12-28 08:38:22 +00:00
struct mp_chmap a;
struct mp_chmap b;
test: make tests part of the mpv binary Until now, each .c file in test/ was built as separate, self-contained binary. Each binary could be run to execute the tests it contained. Change this and make them part of the normal mpv binary. Now the tests have to be invoked via the --unittest option. Do this for two reasons: - Tests now run within a "properly" initialized mpv instance, so all services are available. - Possibly simplifying the situation for future build systems. The first point is the main motivation. The mpv code is entangled with mp_log and the option system. It feels like a bad idea to duplicate some of the initialization of this just so you can call code using them. I'm also getting rid of cmocka. There wouldn't be any problem to keep it (it's a perfectly sane set of helpers), but NIH calls. I would have had to aggregate all tests into a CMUnitTest list, and I don't see how I'd get different types of entry points easily. Probably easily solvable, but since we made only pretty basic use of this library, NIH-ing this is actually easier (I needed a list of tests with custom metadata anyway, so all what was left was reimplement the assert_* helpers). Unit tests now don't output anything, and if they fail, they'll simply crash and leave a message that typically requires inspecting the test code to figure out what went wrong (and probably editing the test code to get more information). I even merged the various test functions into single ones. Sucks, but here you go. chmap_sel.c is merged into chmap.c, because I didn't see the point of this being separate. json.c drops the print_message() to go along with the new silent-by-default idea, also there's a memory leak fix unrelated to the rest of this commit. The new code is enabled with --enable-tests (--enable-test goes away). Due to waf's option parser, --enable-test still works, because it's a unique prefix to --enable-tests.
2019-11-07 21:42:14 +00:00
struct mp_chmap_sel s = {0};
test_sel("5.1", "7.1", LAYOUTS("7.1"));
test_sel("7.1", "5.1", LAYOUTS("5.1"));
test_sel("7.1(wide-side)", "7.1", LAYOUTS("7.1"));
test_sel("7.1(wide-side)", "5.1(side)", LAYOUTS("7.1", "5.1(side)"));
test_sel("3.1", "5.1", LAYOUTS("7.1", "5.1", "2.1", "stereo", "mono"));
test_sel("5.1", "7.1(rear)", LAYOUTS("7.1(rear)"));
test_sel("5.1(side)", "5.1", LAYOUTS("5.1", "7.1"));
test_sel("5.1", "7.1(alsa)", LAYOUTS("7.1(alsa)"));
test_sel("mono", "stereo", LAYOUTS("stereo", "5.1"));
test_sel("stereo", "stereo", LAYOUTS("stereo", "5.1"));
test_sel("5.1(side)", "7.1(rear)", LAYOUTS("stereo", "7.1(rear)"));
test_sel("7.1", "fl-fr-lfe-fc-bl-br-flc-frc",
LAYOUTS("fl-fr-lfe-fc-bl-br-flc-frc", "3.0(back)"));
mp_chmap_set_unknown(&a, 2);
mp_chmap_from_str(&b, bstr0("5.1"));
mp_chmap_sel_add_map(&s, &a);
assert_false(mp_chmap_sel_fallback(&s, &b));
assert_string_equal(mp_chmap_to_str(&b), "5.1");
test_sel("quad", "quad(side)", LAYOUTS("quad(side)", "stereo"));
test_sel("quad", "quad(side)", LAYOUTS("quad(side)", "7.0"));
test_sel("quad", "quad(side)", LAYOUTS("7.0", "quad(side)"));
test_sel("quad", "7.1(wide-side)", LAYOUTS("7.1(wide-side)", "stereo"));
test_sel("quad", "7.1(wide-side)", LAYOUTS("stereo", "7.1(wide-side)"));
test_sel("quad", "fl-fr-sl-sr",
LAYOUTS("fl-fr-fc-bl-br", "fl-fr-sl-sr"));
test_sel("quad", "fl-fr-bl-br-na-na-na-na",
LAYOUTS("fl-fr-bl-br-na-na-na-na", "quad(side)", "stereo"));
test_sel("quad", "fl-fr-bl-br-na-na-na-na",
LAYOUTS("stereo", "quad(side)", "fl-fr-bl-br-na-na-na-na"));
test_sel("fl-fr-fc-lfe-sl-sr", "fl-fr-lfe-fc-bl-br-na-na",
LAYOUTS("fl-fr-lfe-fc-bl-br-na-na", "fl-fr-lfe-fc-bl-br-sdl-sdr"));
test_sel("fl-fr-fc-lfe-sl-sr", "fl-fr-lfe-fc-bl-br-na-na",
LAYOUTS("fl-fr-lfe-fc-bl-br-sdl-sdr", "fl-fr-lfe-fc-bl-br-na-na"));
test_sel("na-fl-fr", "na-fl-fr", LAYOUTS("na-fl-fr-na", "fl-na-fr", "na-fl-fr",
"fl-fr-na-na", "na-na-fl-fr"));
chmap_sel: add multichannel fallback heuristic Instead of just failing during channel map selection, try to select a close layout that makes most sense and upmix/downmix to that instead of failing AO initialization. The heuristic is rather simple, and uses the following steps: 1) If mono is required always prefer stereo to a multichannel upmix. 2) Search for an upmix that is an exact superset of the required channel map. 3) Search for a downmix that is the exact subset of the required channel map. 4) Search for either an upmix or downmix that is the closest (minimum difference of channels) to the required channel map.
2014-12-28 08:38:22 +00:00
mp_chmap_from_str(&a, bstr0("3.1"));
mp_chmap_from_str(&b, bstr0("2.1"));
audio: simplify further Drop mp_chmap_diff() (which is unused too now), and implement mp_chmap_diffn() in a slightly simpler way. (Too bad there is no standard function for counting set bits.)
2015-05-08 19:22:39 +00:00
assert_int_equal(mp_chmap_diffn(&a, &b), 1);
chmap_sel: add multichannel fallback heuristic Instead of just failing during channel map selection, try to select a close layout that makes most sense and upmix/downmix to that instead of failing AO initialization. The heuristic is rather simple, and uses the following steps: 1) If mono is required always prefer stereo to a multichannel upmix. 2) Search for an upmix that is an exact superset of the required channel map. 3) Search for a downmix that is the exact subset of the required channel map. 4) Search for either an upmix or downmix that is the closest (minimum difference of channels) to the required channel map.
2014-12-28 08:38:22 +00:00
mp_chmap_from_str(&b, bstr0("6.1(back)"));
audio: simplify further Drop mp_chmap_diff() (which is unused too now), and implement mp_chmap_diffn() in a slightly simpler way. (Too bad there is no standard function for counting set bits.)
2015-05-08 19:22:39 +00:00
assert_int_equal(mp_chmap_diffn(&a, &b), 0);
assert_int_equal(mp_chmap_diffn(&b, &a), 3);
test/chmap: start adding AVChannelLayout unit tests The first set iterates through all standard FFmpeg layouts and checks that those which fit MP_NUM_CHANNELS succeed. The second set iterates through built-in named channel layouts, and attempts to convert them to AVChannelLayouts.
2022-06-12 11:12:53 +00:00
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
test_av_channel_layout_to_mp_chmap();
test_mp_chmap_to_av_channel_layout();
various: remove av channel layout check
2024-06-21 16:24:30 +00:00
test: integrate unittests with meson This reworks all of mpv's unit tests so they are compiled as separate executables (optional) and run via meson test. Because most of the tests are dependant on mpv's internals, existing compiled objects are leveraged to create static libs and used when necessary. As an aside, a function was moved into video/out/gpu/utils for sanity's sake (otherwise most of vo would have been needed). As a plus, meson multithreads running tests automatically and also the output no longer pollutes the source directory. There are tests that can break due to ffmpeg changes, so they require a specific minimum libavutil version to be built.
2023-02-26 03:50:08 +00:00
return 0;
chmap_sel: add multichannel fallback heuristic Instead of just failing during channel map selection, try to select a close layout that makes most sense and upmix/downmix to that instead of failing AO initialization. The heuristic is rather simple, and uses the following steps: 1) If mono is required always prefer stereo to a multichannel upmix. 2) Search for an upmix that is an exact superset of the required channel map. 3) Search for a downmix that is the exact subset of the required channel map. 4) Search for either an upmix or downmix that is the closest (minimum difference of channels) to the required channel map.
2014-12-28 08:38:22 +00:00
}