mirror of
https://github.com/mpv-player/mpv
synced 2024-12-22 14:52:43 +00:00
8922c7b84a
I'm not even sure when/if FFmpeg produces those. It's just confusing. If you really need this, you can still use dl-dr. I expect that most use is unintentional. Probably fixes #4545.
489 lines
17 KiB
C
489 lines
17 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <assert.h>
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#include <libavutil/common.h>
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#include "common/common.h"
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#include "common/msg.h"
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#include "chmap.h"
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// Names taken from libavutil/channel_layout.c (Not accessible by API.)
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// Use of these names is hard-coded in some places (e.g. ao_alsa.c)
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static const char *const speaker_names[MP_SPEAKER_ID_COUNT][2] = {
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[MP_SPEAKER_ID_FL] = {"fl", "front left"},
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[MP_SPEAKER_ID_FR] = {"fr", "front right"},
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[MP_SPEAKER_ID_FC] = {"fc", "front center"},
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[MP_SPEAKER_ID_LFE] = {"lfe", "low frequency"},
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[MP_SPEAKER_ID_BL] = {"bl", "back left"},
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[MP_SPEAKER_ID_BR] = {"br", "back right"},
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[MP_SPEAKER_ID_FLC] = {"flc", "front left-of-center"},
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[MP_SPEAKER_ID_FRC] = {"frc", "front right-of-center"},
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[MP_SPEAKER_ID_BC] = {"bc", "back center"},
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[MP_SPEAKER_ID_SL] = {"sl", "side left"},
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[MP_SPEAKER_ID_SR] = {"sr", "side right"},
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[MP_SPEAKER_ID_TC] = {"tc", "top center"},
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[MP_SPEAKER_ID_TFL] = {"tfl", "top front left"},
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[MP_SPEAKER_ID_TFC] = {"tfc", "top front center"},
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[MP_SPEAKER_ID_TFR] = {"tfr", "top front right"},
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[MP_SPEAKER_ID_TBL] = {"tbl", "top back left"},
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[MP_SPEAKER_ID_TBC] = {"tbc", "top back center"},
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[MP_SPEAKER_ID_TBR] = {"tbr", "top back right"},
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[MP_SPEAKER_ID_DL] = {"dl", "downmix left"},
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[MP_SPEAKER_ID_DR] = {"dr", "downmix right"},
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[MP_SPEAKER_ID_WL] = {"wl", "wide left"},
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[MP_SPEAKER_ID_WR] = {"wr", "wide right"},
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[MP_SPEAKER_ID_SDL] = {"sdl", "surround direct left"},
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[MP_SPEAKER_ID_SDR] = {"sdr", "surround direct right"},
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[MP_SPEAKER_ID_LFE2] = {"lfe2", "low frequency 2"},
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[MP_SPEAKER_ID_NA] = {"na", "not available"},
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};
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// Names taken from libavutil/channel_layout.c (Not accessible by API.)
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// Channel order corresponds to lavc/waveex, except for the alsa entries.
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static const char *const std_layout_names[][2] = {
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{"empty", ""}, // not in lavc
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{"mono", "fc"},
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{"1.0", "fc"}, // not in lavc
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{"stereo", "fl-fr"},
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{"2.0", "fl-fr"}, // not in lavc
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{"2.1", "fl-fr-lfe"},
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{"3.0", "fl-fr-fc"},
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{"3.0(back)", "fl-fr-bc"},
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{"4.0", "fl-fr-fc-bc"},
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{"quad", "fl-fr-bl-br"},
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{"quad(side)", "fl-fr-sl-sr"},
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{"3.1", "fl-fr-fc-lfe"},
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{"3.1(back)", "fl-fr-lfe-bc"}, // not in lavc
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{"5.0", "fl-fr-fc-bl-br"},
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{"5.0(alsa)", "fl-fr-bl-br-fc"}, // not in lavc
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{"5.0(side)", "fl-fr-fc-sl-sr"},
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{"4.1", "fl-fr-fc-lfe-bc"},
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{"4.1(alsa)", "fl-fr-bl-br-lfe"}, // not in lavc
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{"5.1", "fl-fr-fc-lfe-bl-br"},
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{"5.1(alsa)", "fl-fr-bl-br-fc-lfe"}, // not in lavc
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{"5.1(side)", "fl-fr-fc-lfe-sl-sr"},
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{"6.0", "fl-fr-fc-bc-sl-sr"},
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{"6.0(front)", "fl-fr-flc-frc-sl-sr"},
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{"hexagonal", "fl-fr-fc-bl-br-bc"},
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{"6.1", "fl-fr-fc-lfe-bc-sl-sr"},
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{"6.1(back)", "fl-fr-fc-lfe-bl-br-bc"}, // lavc calls this "6.1" too
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{"6.1(top)", "fl-fr-fc-lfe-bl-br-tc"}, // not in lavc
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{"6.1(front)", "fl-fr-lfe-flc-frc-sl-sr"},
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{"7.0", "fl-fr-fc-bl-br-sl-sr"},
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{"7.0(front)", "fl-fr-fc-flc-frc-sl-sr"},
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{"7.0(rear)", "fl-fr-fc-bl-br-sdl-sdr"}, // not in lavc
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{"7.1", "fl-fr-fc-lfe-bl-br-sl-sr"},
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{"7.1(alsa)", "fl-fr-bl-br-fc-lfe-sl-sr"}, // not in lavc
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{"7.1(wide)", "fl-fr-fc-lfe-bl-br-flc-frc"},
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{"7.1(wide-side)", "fl-fr-fc-lfe-flc-frc-sl-sr"},
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{"7.1(rear)", "fl-fr-fc-lfe-bl-br-sdl-sdr"}, // not in lavc
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{"octagonal", "fl-fr-fc-bl-br-bc-sl-sr"},
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{"auto", ""}, // not in lavc
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{0}
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};
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static const struct mp_chmap default_layouts[] = {
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{0}, // empty
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MP_CHMAP_INIT_MONO, // mono
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MP_CHMAP2(FL, FR), // stereo
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MP_CHMAP3(FL, FR, LFE), // 2.1
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MP_CHMAP4(FL, FR, FC, BC), // 4.0
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MP_CHMAP5(FL, FR, FC, BL, BR), // 5.0
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MP_CHMAP6(FL, FR, FC, LFE, BL, BR), // 5.1
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MP_CHMAP7(FL, FR, FC, LFE, BC, SL, SR), // 6.1
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MP_CHMAP8(FL, FR, FC, LFE, BL, BR, SL, SR), // 7.1
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};
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// Returns true if speakers are mapped uniquely, and there's at least 1 channel.
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bool mp_chmap_is_valid(const struct mp_chmap *src)
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{
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bool mapped[MP_SPEAKER_ID_COUNT] = {0};
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for (int n = 0; n < src->num; n++) {
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int sp = src->speaker[n];
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if (sp >= MP_SPEAKER_ID_COUNT || mapped[sp])
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return false;
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if (sp != MP_SPEAKER_ID_NA)
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mapped[sp] = true;
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}
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return src->num > 0;
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}
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bool mp_chmap_is_empty(const struct mp_chmap *src)
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{
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return src->num == 0;
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}
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// Return true if the channel map defines the number of the channels only, and
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// the channels have to meaning associated with them.
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bool mp_chmap_is_unknown(const struct mp_chmap *src)
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{
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for (int n = 0; n < src->num; n++) {
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if (src->speaker[n] != MP_SPEAKER_ID_NA)
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return false;
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}
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return mp_chmap_is_valid(src);
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}
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// Note: empty channel maps compare as equal. Invalid ones can equal too.
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bool mp_chmap_equals(const struct mp_chmap *a, const struct mp_chmap *b)
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{
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if (a->num != b->num)
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return false;
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for (int n = 0; n < a->num; n++) {
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if (a->speaker[n] != b->speaker[n])
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return false;
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}
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return true;
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}
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// Whether they use the same speakers (even if in different order).
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bool mp_chmap_equals_reordered(const struct mp_chmap *a, const struct mp_chmap *b)
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{
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struct mp_chmap t1 = *a, t2 = *b;
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mp_chmap_reorder_norm(&t1);
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mp_chmap_reorder_norm(&t2);
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return mp_chmap_equals(&t1, &t2);
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}
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bool mp_chmap_is_stereo(const struct mp_chmap *src)
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{
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static const struct mp_chmap stereo = MP_CHMAP_INIT_STEREO;
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return mp_chmap_equals(src, &stereo);
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}
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static int comp_uint8(const void *a, const void *b)
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{
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return *(const uint8_t *)a - *(const uint8_t *)b;
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}
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// Reorder channels to normal order, with monotonically increasing speaker IDs.
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// We define this order as the same order used with waveex.
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void mp_chmap_reorder_norm(struct mp_chmap *map)
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{
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uint8_t *arr = &map->speaker[0];
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qsort(arr, map->num, 1, comp_uint8);
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}
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// Remove silent (NA) channels, if any.
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void mp_chmap_remove_na(struct mp_chmap *map)
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{
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struct mp_chmap new = {0};
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for (int n = 0; n < map->num; n++) {
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int sp = map->speaker[n];
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if (sp != MP_SPEAKER_ID_NA)
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new.speaker[new.num++] = map->speaker[n];
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}
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*map = new;
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}
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// Add silent (NA) channels to map until map->num >= num.
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void mp_chmap_fill_na(struct mp_chmap *map, int num)
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{
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assert(num <= MP_NUM_CHANNELS);
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while (map->num < num)
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map->speaker[map->num++] = MP_SPEAKER_ID_NA;
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}
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// Set *dst to a standard layout with the given number of channels.
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// If the number of channels is invalid, an invalid map is set, and
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// mp_chmap_is_valid(dst) will return false.
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void mp_chmap_from_channels(struct mp_chmap *dst, int num_channels)
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{
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*dst = (struct mp_chmap) {0};
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if (num_channels >= 0 && num_channels < MP_ARRAY_SIZE(default_layouts))
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*dst = default_layouts[num_channels];
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if (!dst->num)
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mp_chmap_set_unknown(dst, num_channels);
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}
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// Set *dst to an unknown layout for the given numbers of channels.
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// If the number of channels is invalid, an invalid map is set, and
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// mp_chmap_is_valid(dst) will return false.
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// A mp_chmap with all entries set to NA is treated specially in some
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// contexts (watch out for mp_chmap_is_unknown()).
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void mp_chmap_set_unknown(struct mp_chmap *dst, int num_channels)
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{
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if (num_channels < 0 || num_channels > MP_NUM_CHANNELS) {
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*dst = (struct mp_chmap) {0};
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} else {
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dst->num = num_channels;
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for (int n = 0; n < dst->num; n++)
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dst->speaker[n] = MP_SPEAKER_ID_NA;
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}
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}
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// Return the ffmpeg/libav channel layout as in <libavutil/channel_layout.h>.
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// Speakers not representable by ffmpeg/libav are dropped.
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// Warning: this ignores the order of the channels, and will return a channel
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// mask even if the order is different from libavcodec's.
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// Also, "unknown" channel maps are translated to non-sense channel
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// maps with the same number of channels.
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uint64_t mp_chmap_to_lavc_unchecked(const struct mp_chmap *src)
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{
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struct mp_chmap t = *src;
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if (t.num > 64)
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return 0;
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// lavc has no concept for unknown layouts yet, so pick something that does
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// the job of signaling the number of channels, even if it makes no sense
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// as a proper layout.
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if (mp_chmap_is_unknown(&t))
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return t.num == 64 ? (uint64_t)-1 : (1ULL << t.num) - 1;
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uint64_t mask = 0;
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for (int n = 0; n < t.num; n++) {
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if (t.speaker[n] < 64) // ignore MP_SPEAKER_ID_NA etc.
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mask |= 1ULL << t.speaker[n];
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}
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return mask;
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}
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// Return the ffmpeg/libav channel layout as in <libavutil/channel_layout.h>.
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// Returns 0 if the channel order doesn't match lavc's or if it's invalid.
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uint64_t mp_chmap_to_lavc(const struct mp_chmap *src)
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{
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if (!mp_chmap_is_lavc(src))
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return 0;
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return mp_chmap_to_lavc_unchecked(src);
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}
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// Set channel map from the ffmpeg/libav channel layout as in
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// <libavutil/channel_layout.h>.
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// If the number of channels exceed MP_NUM_CHANNELS, set dst to empty.
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void mp_chmap_from_lavc(struct mp_chmap *dst, uint64_t src)
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{
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dst->num = 0;
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for (int n = 0; n < 64; n++) {
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if (src & (1ULL << n)) {
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if (dst->num >= MP_NUM_CHANNELS) {
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dst->num = 0;
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return;
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}
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dst->speaker[dst->num] = n;
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dst->num++;
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}
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}
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}
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bool mp_chmap_is_lavc(const struct mp_chmap *src)
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{
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if (!mp_chmap_is_valid(src))
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return false;
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if (mp_chmap_is_unknown(src))
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return true;
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// lavc's channel layout is a bit mask, and channels are always ordered
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// from LSB to MSB speaker bits, so speaker IDs have to increase.
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assert(src->num > 0);
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for (int n = 1; n < src->num; n++) {
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if (src->speaker[n - 1] >= src->speaker[n])
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return false;
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}
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for (int n = 0; n < src->num; n++) {
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if (src->speaker[n] >= 64)
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return false;
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}
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return true;
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}
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// Warning: for "unknown" channel maps, this returns something that may not
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// make sense. Invalid channel maps are not changed.
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void mp_chmap_reorder_to_lavc(struct mp_chmap *map)
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{
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if (!mp_chmap_is_valid(map))
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return;
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uint64_t mask = mp_chmap_to_lavc_unchecked(map);
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mp_chmap_from_lavc(map, mask);
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}
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// Get reordering array for from->to reordering. from->to must have the same set
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// of speakers (i.e. same number and speaker IDs, just different order). Then,
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// for each speaker n, src[n] will be set such that:
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// to->speaker[n] = from->speaker[src[n]]
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// (src[n] gives the source channel for destination channel n)
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// If *from and *to don't contain the same set of speakers, then the above
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// invariant is not guaranteed. Instead, src[n] can be set to -1 if the channel
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// at to->speaker[n] is unmapped.
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void mp_chmap_get_reorder(int src[MP_NUM_CHANNELS], const struct mp_chmap *from,
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const struct mp_chmap *to)
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{
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for (int n = 0; n < MP_NUM_CHANNELS; n++)
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src[n] = -1;
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if (mp_chmap_is_unknown(from) || mp_chmap_is_unknown(to)) {
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for (int n = 0; n < to->num; n++)
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src[n] = n < from->num ? n : -1;
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return;
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}
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for (int n = 0; n < to->num; n++) {
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for (int i = 0; i < from->num; i++) {
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if (to->speaker[n] == from->speaker[i]) {
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src[n] = i;
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break;
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}
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}
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}
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for (int n = 0; n < to->num; n++)
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assert(src[n] < 0 || (to->speaker[n] == from->speaker[src[n]]));
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}
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// Return the number of channels only in a.
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int mp_chmap_diffn(const struct mp_chmap *a, const struct mp_chmap *b)
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{
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uint64_t a_mask = mp_chmap_to_lavc_unchecked(a);
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uint64_t b_mask = mp_chmap_to_lavc_unchecked(b);
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return av_popcount64((a_mask ^ b_mask) & a_mask);
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}
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// Returns something like "fl-fr-fc". If there's a standard layout in lavc
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// order, return that, e.g. "3.0" instead of "fl-fr-fc".
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// Unassigned but valid speakers get names like "sp28".
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char *mp_chmap_to_str_buf(char *buf, size_t buf_size, const struct mp_chmap *src)
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{
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buf[0] = '\0';
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if (mp_chmap_is_unknown(src)) {
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snprintf(buf, buf_size, "unknown%d", src->num);
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return buf;
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}
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for (int n = 0; n < src->num; n++) {
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int sp = src->speaker[n];
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const char *s = sp < MP_SPEAKER_ID_COUNT ? speaker_names[sp][0] : NULL;
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char sp_buf[10];
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if (!s) {
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snprintf(sp_buf, sizeof(sp_buf), "sp%d", sp);
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s = sp_buf;
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}
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mp_snprintf_cat(buf, buf_size, "%s%s", n > 0 ? "-" : "", s);
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}
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// To standard layout name
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for (int n = 0; std_layout_names[n][0]; n++) {
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if (strcmp(buf, std_layout_names[n][1]) == 0) {
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snprintf(buf, buf_size, "%s", std_layout_names[n][0]);
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break;
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}
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}
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return buf;
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}
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// If src can be parsed as channel map (as produced by mp_chmap_to_str()),
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// return true and set *dst. Otherwise, return false and don't change *dst.
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// Note: call mp_chmap_is_valid() to test whether the returned map is valid
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// the map could be empty, or contain multiply mapped channels
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bool mp_chmap_from_str(struct mp_chmap *dst, bstr src)
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{
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// Single number corresponds to mp_chmap_from_channels()
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if (src.len > 0) {
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bstr t = src;
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bool unknown = bstr_eatstart0(&t, "unknown");
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bstr rest;
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long long count = bstrtoll(t, &rest, 10);
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if (rest.len == 0) {
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struct mp_chmap res;
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if (unknown) {
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mp_chmap_set_unknown(&res, count);
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} else {
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mp_chmap_from_channels(&res, count);
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}
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if (mp_chmap_is_valid(&res)) {
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*dst = res;
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return true;
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}
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}
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}
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// From standard layout name
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for (int n = 0; std_layout_names[n][0]; n++) {
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if (bstr_equals0(src, std_layout_names[n][0])) {
|
|
src = bstr0(std_layout_names[n][1]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Explicit speaker list (separated by "-")
|
|
struct mp_chmap res = {0};
|
|
while (src.len) {
|
|
bstr s;
|
|
bstr_split_tok(src, "-", &s, &src);
|
|
int speaker = -1;
|
|
for (int n = 0; n < MP_SPEAKER_ID_COUNT; n++) {
|
|
const char *name = speaker_names[n][0];
|
|
if (name && bstr_equals0(s, name)) {
|
|
speaker = n;
|
|
break;
|
|
}
|
|
}
|
|
if (speaker < 0) {
|
|
if (bstr_eatstart0(&s, "sp")) {
|
|
long long sp = bstrtoll(s, &s, 0);
|
|
if (s.len == 0 && sp >= 0 && sp < MP_SPEAKER_ID_COUNT)
|
|
speaker = sp;
|
|
}
|
|
if (speaker < 0)
|
|
return false;
|
|
}
|
|
if (res.num >= MP_NUM_CHANNELS)
|
|
return false;
|
|
res.speaker[res.num] = speaker;
|
|
res.num++;
|
|
}
|
|
|
|
*dst = res;
|
|
return true;
|
|
}
|
|
|
|
// Output a human readable "canonical" channel map string. Converting this from
|
|
// a string back to a channel map can yield a different map, but the string
|
|
// looks nicer. E.g. "fc-fl-fr-na" becomes "3.0".
|
|
char *mp_chmap_to_str_hr_buf(char *buf, size_t buf_size, const struct mp_chmap *src)
|
|
{
|
|
struct mp_chmap map = *src;
|
|
mp_chmap_remove_na(&map);
|
|
for (int n = 0; std_layout_names[n][0]; n++) {
|
|
struct mp_chmap s;
|
|
if (mp_chmap_from_str(&s, bstr0(std_layout_names[n][0])) &&
|
|
mp_chmap_equals_reordered(&s, &map))
|
|
{
|
|
map = s;
|
|
break;
|
|
}
|
|
}
|
|
return mp_chmap_to_str_buf(buf, buf_size, &map);
|
|
}
|
|
|
|
void mp_chmap_print_help(struct mp_log *log)
|
|
{
|
|
mp_info(log, "Speakers:\n");
|
|
for (int n = 0; n < MP_SPEAKER_ID_COUNT; n++) {
|
|
if (speaker_names[n][0])
|
|
mp_info(log, " %-16s (%s)\n",
|
|
speaker_names[n][0], speaker_names[n][1]);
|
|
}
|
|
mp_info(log, "Standard layouts:\n");
|
|
for (int n = 0; std_layout_names[n][0]; n++) {
|
|
mp_info(log, " %-16s (%s)\n",
|
|
std_layout_names[n][0], std_layout_names[n][1]);
|
|
}
|
|
for (int n = 0; n < MP_NUM_CHANNELS; n++)
|
|
mp_info(log, " unknown%d\n", n + 1);
|
|
}
|