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mpv/audio/chmap.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <assert.h>
#include "common/common.h"
#include "common/msg.h"
#include "chmap.h"
// Names taken from libavutil/channel_layout.c (Not accessible by API.)
// Use of these names is hard-coded in some places (e.g. ao_alsa.c)
static const char *const speaker_names[MP_SPEAKER_ID_COUNT][2] = {
[MP_SPEAKER_ID_FL] = {"fl", "front left"},
[MP_SPEAKER_ID_FR] = {"fr", "front right"},
[MP_SPEAKER_ID_FC] = {"fc", "front center"},
[MP_SPEAKER_ID_LFE] = {"lfe", "low frequency"},
[MP_SPEAKER_ID_BL] = {"bl", "back left"},
[MP_SPEAKER_ID_BR] = {"br", "back right"},
[MP_SPEAKER_ID_FLC] = {"flc", "front left-of-center"},
[MP_SPEAKER_ID_FRC] = {"frc", "front right-of-center"},
[MP_SPEAKER_ID_BC] = {"bc", "back center"},
[MP_SPEAKER_ID_SL] = {"sl", "side left"},
[MP_SPEAKER_ID_SR] = {"sr", "side right"},
[MP_SPEAKER_ID_TC] = {"tc", "top center"},
[MP_SPEAKER_ID_TFL] = {"tfl", "top front left"},
[MP_SPEAKER_ID_TFC] = {"tfc", "top front center"},
[MP_SPEAKER_ID_TFR] = {"tfr", "top front right"},
[MP_SPEAKER_ID_TBL] = {"tbl", "top back left"},
[MP_SPEAKER_ID_TBC] = {"tbc", "top back center"},
[MP_SPEAKER_ID_TBR] = {"tbr", "top back right"},
[MP_SPEAKER_ID_DL] = {"dl", "downmix left"},
[MP_SPEAKER_ID_DR] = {"dr", "downmix right"},
[MP_SPEAKER_ID_WL] = {"wl", "wide left"},
[MP_SPEAKER_ID_WR] = {"wr", "wide right"},
[MP_SPEAKER_ID_SDL] = {"sdl", "surround direct left"},
[MP_SPEAKER_ID_SDR] = {"sdr", "surround direct right"},
[MP_SPEAKER_ID_LFE2] = {"lfe2", "low frequency 2"},
};
// Names taken from libavutil/channel_layout.c (Not accessible by API.)
// Channel order corresponds to lavc/waveex, except for the alsa entries.
static const char *const std_layout_names[][2] = {
{"empty", ""}, // not in lavc
{"mono", "fc"},
{"1.0", "fc"}, // not in lavc
{"stereo", "fl-fr"},
{"2.0", "fl-fr"}, // not in lavc
{"2.1", "fl-fr-lfe"},
{"3.0", "fl-fr-fc"},
{"3.0(back)", "fl-fr-bc"},
{"4.0", "fl-fr-fc-bc"},
{"quad", "fl-fr-bl-br"},
{"quad(side)", "fl-fr-sl-sr"},
{"3.1", "fl-fr-fc-lfe"},
{"5.0", "fl-fr-fc-bl-br"},
{"5.0(alsa)", "fl-fr-bl-br-fc"}, // not in lavc
{"5.0(side)", "fl-fr-fc-sl-sr"},
{"4.1", "fl-fr-fc-lfe-bc"},
{"4.1(alsa)", "fl-fr-bl-br-lfe"}, // not in lavc
{"5.1", "fl-fr-fc-lfe-bl-br"},
{"5.1(alsa)", "fl-fr-bl-br-fc-lfe"}, // not in lavc
{"5.1(side)", "fl-fr-fc-lfe-sl-sr"},
{"6.0", "fl-fr-fc-bc-sl-sr"},
{"6.0(front)", "fl-fr-flc-frc-sl-sr"},
{"hexagonal", "fl-fr-fc-bl-br-bc"},
{"6.1", "fl-fr-fc-lfe-bc-sl-sr"},
{"6.1(back)", "fl-fr-fc-lfe-bl-br-bc"}, // lavc calls this "6.1" too
{"6.1(front)", "fl-fr-lfe-flc-frc-sl-sr"},
{"7.0", "fl-fr-fc-bl-br-sl-sr"},
{"7.0(front)", "fl-fr-fc-flc-frc-sl-sr"},
{"7.1", "fl-fr-fc-lfe-bl-br-sl-sr"},
{"7.1(alsa)", "fl-fr-bl-br-fc-lfe-sl-sr"}, // not in lavc
{"7.1(wide)", "fl-fr-fc-lfe-bl-br-flc-frc"},
{"7.1(wide-side)", "fl-fr-fc-lfe-flc-frc-sl-sr"},
{"7.1(rear)", "fl-fr-fc-lfe-bl-br-sdl-sdr"},
{"octagonal", "fl-fr-fc-bl-br-bc-sl-sr"},
{"downmix", "dl-dr"},
{"auto", ""}, // not in lavc
{0}
};
static const struct mp_chmap default_layouts[MP_NUM_CHANNELS + 1] = {
{0}, // empty
MP_CHMAP_INIT_MONO, // mono
MP_CHMAP2(FL, FR), // stereo
MP_CHMAP3(FL, FR, LFE), // 2.1
MP_CHMAP4(FL, FR, FC, BC), // 4.0
MP_CHMAP5(FL, FR, FC, BL, BR), // 5.0
MP_CHMAP6(FL, FR, FC, LFE, BL, BR), // 5.1
MP_CHMAP7(FL, FR, FC, LFE, BC, SL, SR), // 6.1
MP_CHMAP8(FL, FR, FC, LFE, BL, BR, SL, SR), // 7.1
};
// The channel order was lavc/waveex, but differs from lavc for 5, 6 and 8
// channels. 3 and 7 channels were likely undefined (no ALSA support).
// I'm not sure about the 4 channel case: ALSA uses "quad", while the ffmpeg
// default layout is "4.0".
static const char *const mplayer_layouts[MP_NUM_CHANNELS + 1] = {
[1] = "mono",
[2] = "stereo",
[4] = "quad",
[5] = "5.0(alsa)",
[6] = "5.1(alsa)",
[8] = "7.1(alsa)",
};
// Returns true if speakers are mapped uniquely, and there's at least 1 channel.
bool mp_chmap_is_valid(const struct mp_chmap *src)
{
bool mapped[MP_SPEAKER_ID_COUNT] = {0};
for (int n = 0; n < src->num; n++) {
int sp = src->speaker[n];
if (sp >= MP_SPEAKER_ID_COUNT || mapped[sp])
return false;
mapped[sp] = true;
}
return src->num > 0;
}
bool mp_chmap_is_empty(const struct mp_chmap *src)
{
return src->num == 0;
}
// Return true if the channel map defines the number of the channels only, and
// the channels have to meaning associated with them.
bool mp_chmap_is_unknown(const struct mp_chmap *src)
{
for (int n = 0; n < src->num; n++) {
int speaker = src->speaker[n];
if (speaker >= MP_SPEAKER_ID_UNKNOWN0 &&
speaker <= MP_SPEAKER_ID_UNKNOWN_LAST)
return true;
}
return false;
}
// Note: empty channel maps compare as equal. Invalid ones can equal too.
bool mp_chmap_equals(const struct mp_chmap *a, const struct mp_chmap *b)
{
if (a->num != b->num)
return false;
for (int n = 0; n < a->num; n++) {
if (a->speaker[n] != b->speaker[n])
return false;
}
return true;
}
// Whether they use the same speakers (even if in different order).
bool mp_chmap_equals_reordered(const struct mp_chmap *a, const struct mp_chmap *b)
{
struct mp_chmap t1 = *a, t2 = *b;
mp_chmap_reorder_norm(&t1);
mp_chmap_reorder_norm(&t2);
return mp_chmap_equals(&t1, &t2);
}
bool mp_chmap_is_compatible(const struct mp_chmap *a, const struct mp_chmap *b)
{
if (mp_chmap_equals(a, b))
return true;
if (a->num == b->num && (mp_chmap_is_unknown(a) || mp_chmap_is_unknown(b)))
return true;
return false;
}
bool mp_chmap_is_stereo(const struct mp_chmap *src)
{
static const struct mp_chmap stereo = MP_CHMAP_INIT_STEREO;
return mp_chmap_equals(src, &stereo);
}
static int comp_uint8(const void *a, const void *b)
{
return *(const uint8_t *)a - *(const uint8_t *)b;
}
// Reorder channels to normal order, with monotonically increasing speaker IDs.
// We define this order as the same order used with waveex.
void mp_chmap_reorder_norm(struct mp_chmap *map)
{
uint8_t *arr = &map->speaker[0];
qsort(arr, map->num, 1, comp_uint8);
}
// Set *dst to a standard layout with the given number of channels.
// If the number of channels is invalid, an invalid map is set, and
// mp_chmap_is_valid(dst) will return false.
void mp_chmap_from_channels(struct mp_chmap *dst, int num_channels)
{
if (num_channels < 0 || num_channels > MP_NUM_CHANNELS) {
*dst = (struct mp_chmap) {0};
} else {
*dst = default_layouts[num_channels];
}
}
// Try to do what mplayer/mplayer2/mpv did before channel layouts were
// introduced, i.e. get the old default channel order.
void mp_chmap_from_channels_alsa(struct mp_chmap *dst, int num_channels)
{
if (num_channels < 0 || num_channels > MP_NUM_CHANNELS) {
*dst = (struct mp_chmap) {0};
} else {
mp_chmap_from_str(dst, bstr0(mplayer_layouts[num_channels]));
if (!dst->num)
mp_chmap_from_channels(dst, num_channels);
}
}
// Set *dst to an unknown layout for the given numbers of channels.
// If the number of channels is invalid, an invalid map is set, and
// mp_chmap_is_valid(dst) will return false.
void mp_chmap_set_unknown(struct mp_chmap *dst, int num_channels)
{
if (num_channels < 0 || num_channels > MP_NUM_CHANNELS) {
*dst = (struct mp_chmap) {0};
} else {
dst->num = num_channels;
for (int n = 0; n < dst->num; n++)
dst->speaker[n] = MP_SPEAKER_ID_UNKNOWN0 + n;
}
}
// Return channel index of the given speaker, or -1.
static int mp_chmap_find_speaker(const struct mp_chmap *map, int speaker)
{
for (int n = 0; n < map->num; n++) {
if (map->speaker[n] == speaker)
return n;
}
return -1;
}
static void mp_chmap_remove_speaker(struct mp_chmap *map, int speaker)
{
int index = mp_chmap_find_speaker(map, speaker);
if (index >= 0) {
for (int n = index; n < map->num - 1; n++)
map->speaker[n] = map->speaker[n + 1];
map->num--;
}
}
// Some decoders output additional, redundant channels, which are usually
// useless and will mess up proper audio output channel handling.
// map: channel map from which the channels should be removed
// requested: if not NULL, and if it contains any of the "useless" channels,
// don't remove them (this is for convenience)
void mp_chmap_remove_useless_channels(struct mp_chmap *map,
const struct mp_chmap *requested)
{
if (requested &&
mp_chmap_find_speaker(requested, MP_SPEAKER_ID_DL) >= 0)
return;
if (map->num > 2) {
mp_chmap_remove_speaker(map, MP_SPEAKER_ID_DL);
mp_chmap_remove_speaker(map, MP_SPEAKER_ID_DR);
}
}
// Return the ffmpeg/libav channel layout as in <libavutil/channel_layout.h>.
// Warning: this ignores the order of the channels, and will return a channel
// mask even if the order is different from libavcodec's.
uint64_t mp_chmap_to_lavc_unchecked(const struct mp_chmap *src)
{
// lavc has no concept for unknown layouts yet, so pick a default
struct mp_chmap t = *src;
if (mp_chmap_is_unknown(&t))
mp_chmap_from_channels(&t, t.num);
uint64_t mask = 0;
for (int n = 0; n < t.num; n++)
mask |= 1ULL << t.speaker[n];
return mask;
}
// Return the ffmpeg/libav channel layout as in <libavutil/channel_layout.h>.
// Returns 0 if the channel order doesn't match lavc's or if it's invalid.
uint64_t mp_chmap_to_lavc(const struct mp_chmap *src)
{
if (!mp_chmap_is_lavc(src))
return 0;
return mp_chmap_to_lavc_unchecked(src);
}
// Set channel map from the ffmpeg/libav channel layout as in
// <libavutil/channel_layout.h>.
// If the number of channels exceed MP_NUM_CHANNELS, set dst to empty.
void mp_chmap_from_lavc(struct mp_chmap *dst, uint64_t src)
{
dst->num = 0;
for (int n = 0; n < 64; n++) {
if (src & (1ULL << n)) {
if (dst->num >= MP_NUM_CHANNELS) {
dst->num = 0;
return;
}
dst->speaker[dst->num] = n;
dst->num++;
}
}
}
bool mp_chmap_is_lavc(const struct mp_chmap *src)
{
if (!mp_chmap_is_valid(src))
return false;
if (mp_chmap_is_unknown(src))
return true;
// lavc's channel layout is a bit mask, and channels are always ordered
// from LSB to MSB speaker bits, so speaker IDs have to increase.
assert(src->num > 0);
for (int n = 1; n < src->num; n++) {
if (src->speaker[n - 1] >= src->speaker[n])
return false;
}
for (int n = 0; n < src->num; n++) {
if (src->speaker[n] >= 64)
return false;
}
return true;
}
void mp_chmap_reorder_to_lavc(struct mp_chmap *map)
{
if (!mp_chmap_is_valid(map))
return;
uint64_t mask = mp_chmap_to_lavc_unchecked(map);
mp_chmap_from_lavc(map, mask);
}
// Get reordering array for from->to reordering. from->to must have the same set
// of speakers (i.e. same number and speaker IDs, just different order). Then,
// for each speaker n, dst[n] will be set such that:
// to->speaker[dst[n]] = from->speaker[n]
// (dst[n] gives the source channel for destination channel n)
void mp_chmap_get_reorder(int dst[MP_NUM_CHANNELS], const struct mp_chmap *from,
const struct mp_chmap *to)
{
assert(from->num == to->num);
if (mp_chmap_is_unknown(from) || mp_chmap_is_unknown(to)) {
for (int n = 0; n < from->num; n++)
dst[n] = n;
return;
}
// Same set of speakers required
assert(mp_chmap_equals_reordered(from, to));
for (int n = 0; n < from->num; n++) {
int src = from->speaker[n];
dst[n] = -1;
for (int i = 0; i < to->num; i++) {
if (src == to->speaker[i]) {
dst[n] = i;
break;
}
}
assert(dst[n] != -1);
}
for (int n = 0; n < from->num; n++)
assert(to->speaker[dst[n]] == from->speaker[n]);
}
// Performs the difference between a and b, and store it in diff. If b has
// channels that do not appear in a, those will not appear in the difference.
// To get to those the argument ordering in the function call has to be
// inverted. For the same reason, the diff with a superset will return no
// speakers.
void mp_chmap_diff(const struct mp_chmap *a, const struct mp_chmap *b,
struct mp_chmap *diff)
{
uint64_t a_mask = mp_chmap_to_lavc_unchecked(a);
uint64_t b_mask = mp_chmap_to_lavc_unchecked(b);
mp_chmap_from_lavc(diff, (a_mask ^ b_mask) & a_mask);
}
// Checks whether a contains all the speakers in b
bool mp_chmap_contains(const struct mp_chmap *a, const struct mp_chmap *b)
{
struct mp_chmap d1;
struct mp_chmap d2;
mp_chmap_diff(a, b, &d1);
mp_chmap_diff(b, a, &d2);
return a->num >= b->num && d1.num >= 0 && d2.num == 0;
}
// Returns something like "fl-fr-fc". If there's a standard layout in lavc
// order, return that, e.g. "3.0" instead of "fl-fr-fc".
// Unassigned but valid speakers get names like "sp28".
char *mp_chmap_to_str_buf(char *buf, size_t buf_size, const struct mp_chmap *src)
{
buf[0] = '\0';
if (mp_chmap_is_unknown(src)) {
snprintf(buf, buf_size, "unknown%d", src->num);
return buf;
}
for (int n = 0; n < src->num; n++) {
int sp = src->speaker[n];
const char *s = sp < MP_SPEAKER_ID_COUNT ? speaker_names[sp][0] : NULL;
char sp_buf[10];
if (!s) {
snprintf(sp_buf, sizeof(sp_buf), "sp%d", sp);
s = sp_buf;
}
mp_snprintf_cat(buf, buf_size, "%s%s", n > 0 ? "-" : "", s);
}
// To standard layout name
for (int n = 0; std_layout_names[n][0]; n++) {
if (strcmp(buf, std_layout_names[n][1]) == 0) {
snprintf(buf, buf_size, "%s", std_layout_names[n][0]);
break;
}
}
return buf;
}
// If src can be parsed as channel map (as produced by mp_chmap_to_str()),
// return true and set *dst. Otherwise, return false and don't change *dst.
// Note: call mp_chmap_is_valid() to test whether the returned map is valid
// the map could be empty, or contain multiply mapped channels
bool mp_chmap_from_str(struct mp_chmap *dst, bstr src)
{
// Single number corresponds to mp_chmap_from_channels()
if (src.len > 0) {
bstr t = src;
bool unknown = bstr_eatstart0(&t, "unknown");
bstr rest;
long long count = bstrtoll(t, &rest, 10);
if (rest.len == 0) {
struct mp_chmap res;
if (unknown) {
mp_chmap_set_unknown(&res, count);
} else {
mp_chmap_from_channels(&res, count);
}
if (mp_chmap_is_valid(&res)) {
*dst = res;
return true;
}
}
}
// From standard layout name
for (int n = 0; std_layout_names[n][0]; n++) {
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;
}
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);
}
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