libavutil/tests/channel_layout.c - play-games/ffmpeg - Git at Google


            
            /*

            
             * Copyright (c) 2021 James Almer

            
             *

            
             * 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 <inttypes.h>

            
            #include <stdio.h>

            
            #include <string.h>


            #include "libavutil/bprint.h"

            
            #include "libavutil/channel_layout.h"

            
            #include "libavutil/error.h"

            
            #include "libavutil/internal.h"

            
            #include "libavutil/macros.h"

            
            #include "libavutil/mem.h"


            #define BPRINT_ARGS1(bp, ...)     (bp), __VA_ARGS__

            
            #define BPRINT_ARGS0(bp, ...)     __VA_ARGS__, (bp)

            
            #define ORD_ARGS1(str, size, ...) (str), (size), __VA_ARGS__

            
            #define ORD_ARGS0(str, size, ...) __VA_ARGS__, (str), (size)


            // This macro presumes the AVBPrint to have been cleared before usage.

            
            #define CMP_BPRINT_AND_NONBPRINT(bp, func_name, ARG_ORDER, ...) do {       \

            
                char *str;                                                             \

            
                int size;                                                              \

            
                func_name ## _bprint(BPRINT_ARGS ## ARG_ORDER((bp), __VA_ARGS__));     \

            
                if (strlen((bp)->str) != (bp)->len) {                                  \

            
                    printf("strlen of AVBPrint-string returned by "#func_name"_bprint" \

            
                           " differs from AVBPrint.len: %"SIZE_SPECIFIER" vs. %u\n",   \

            
                           strlen((bp)->str), (bp)->len);                              \

            
                    break;                                                             \

            
                }                                                                      \

            
                size = func_name(ORD_ARGS ## ARG_ORDER(NULL, 0, __VA_ARGS__));         \

            
                if (size <= 0) {                                                       \

            
                    printf(#func_name " returned %d\n", size);                         \

            
                    break;                                                             \

            
                }                                                                      \

            
                if ((bp)->len != size - 1) {                                           \

            
                    printf("Return value %d of " #func_name " inconsistent with length"\

            
                           " %u obtained from corresponding bprint version\n",         \

            
                           size, (bp)->len);                                           \

            
                    break;                                                             \

            
                }                                                                      \

            
                str = av_malloc(size);                                                 \

            
                if (!str) {                                                            \

            
                    printf("string of size %d could not be allocated.\n", size);       \

            
                    break;                                                             \

            
                }                                                                      \

            
                size = func_name(ORD_ARGS ## ARG_ORDER(str, size, __VA_ARGS__));       \

            
                if (size <= 0 || (bp)->len != size - 1) {                              \

            
                    printf("Return value %d of " #func_name " inconsistent with length"\

            
                           " %d obtained in first pass.\n", size, (bp)->len);          \

            
                    av_free(str);                                                      \

            
                    break;                                                             \

            
                }                                                                      \

            
                if (strcmp(str, (bp)->str)) {                                          \

            
                    printf("Ordinary and _bprint versions of "#func_name" disagree: "  \

            
                           "'%s' vs. '%s'\n", str, (bp)->str);                         \

            
                    av_free(str);                                                      \

            
                    break;                                                             \

            
                }                                                                      \

            
                av_free(str);                                                          \

            
                } while (0)


            static void channel_name(AVBPrint *bp, enum AVChannel channel)

            
            {

            
                av_bprint_clear(bp);

            
                CMP_BPRINT_AND_NONBPRINT(bp, av_channel_name, 1, channel);

            
            }


            static void channel_description(AVBPrint *bp, enum AVChannel channel)

            
            {

            
                av_bprint_clear(bp);

            
                CMP_BPRINT_AND_NONBPRINT(bp, av_channel_description, 1, channel);

            
            }


            static void channel_layout_from_mask(AVChannelLayout *layout,

            
                                                 AVBPrint *bp, uint64_t channel_layout)

            
            {

            
                av_channel_layout_uninit(layout);

            
                av_bprint_clear(bp);

            
                if (!av_channel_layout_from_mask(layout, channel_layout) &&

            
                     av_channel_layout_check(layout))

            
                    CMP_BPRINT_AND_NONBPRINT(bp, av_channel_layout_describe, 0, layout);

            
                else

            
                    av_bprintf(bp, "fail");

            
            }


            static void channel_layout_from_string(AVChannelLayout *layout,

            
                                                   AVBPrint *bp, const char *channel_layout)

            
            {

            
                av_channel_layout_uninit(layout);

            
                av_bprint_clear(bp);

            
                if (!av_channel_layout_from_string(layout, channel_layout) &&

            
                     av_channel_layout_check(layout))

            
                    CMP_BPRINT_AND_NONBPRINT(bp, av_channel_layout_describe, 0, layout);

            
                else

            
                    av_bprintf(bp, "fail");

            
            }


            static const char* channel_order_names[]  = {"UNSPEC", "NATIVE", "CUSTOM", "AMBI"};


            static void describe_type(AVBPrint *bp, AVChannelLayout *layout)

            
            {

            
                if (layout->order >= 0 && layout->order < FF_ARRAY_ELEMS(channel_order_names)) {

            
                    av_bprintf(bp, "%-6s (", channel_order_names[layout->order]);

            
                    av_channel_layout_describe_bprint(layout, bp);

            
                    av_bprintf(bp, ")");

            
                } else {

            
                    av_bprintf(bp, "???");

            
                }

            
            }


            static const char *channel_layout_retype(AVChannelLayout *layout, AVBPrint *bp, const char *channel_layout)

            
            {

            
                av_channel_layout_uninit(layout);

            
                av_bprint_clear(bp);

            
                if (!av_channel_layout_from_string(layout, channel_layout) &&

            
                    av_channel_layout_check(layout)) {

            
                    describe_type(bp, layout);

            
                    for (int i = 0; i < FF_CHANNEL_ORDER_NB; i++) {

            
                        int ret;

            
                        AVChannelLayout copy = {0};

            
                        av_bprintf(bp, "\n ");

            
                        if (av_channel_layout_copy(&copy, layout) < 0)

            
                            return "nomem";

            
                        ret = av_channel_layout_retype(&copy, i, 0);

            
                        if (ret < 0 && (copy.order != layout->order || av_channel_layout_compare(&copy, layout)))

            
                            av_bprintf(bp, "failed to keep existing layout on failure");

            
                        if (ret >= 0 && copy.order != i)

            
                            av_bprintf(bp, "returned success but did not change order");

            
                        if (ret == AVERROR(ENOSYS)) {

            
                            av_bprintf(bp, " != %s", channel_order_names[i]);

            
                        } else if (ret < 0) {

            
                            av_bprintf(bp, "FAIL");

            
                        } else {

            
                            av_bprintf(bp, " %s ", ret ? "~~" : "==");

            
                            describe_type(bp, &copy);

            
                        }

            
                        av_channel_layout_uninit(&copy);

            
                    }

            
                } else {

            
                    av_bprintf(bp, "fail");

            
                }

            
                return bp->str;

            
            }


            #define CHANNEL_NAME(x)                                                    \

            
                channel_name(&bp, (x));                                                \

            
                printf("With %-32s %14s\n", AV_STRINGIFY(x)":", bp.str)


            #define CHANNEL_DESCRIPTION(x)                                             \

            
                channel_description(&bp, (x));                                         \

            
                printf("With %-23s %23s\n", AV_STRINGIFY(x)":", bp.str);


            #define CHANNEL_FROM_STRING(x)                                             \

            
                printf("With %-38s %8d\n", AV_STRINGIFY(x)":", av_channel_from_string(x))


            #define CHANNEL_LAYOUT_FROM_MASK(x)                                        \

            
                channel_layout_from_mask(&layout, &bp, (x));


            #define CHANNEL_LAYOUT_FROM_STRING(x)                                      \

            
                channel_layout_from_string(&layout, &bp, (x));                         \

            
                printf("With \"%s\":%*s %32s\n", x, strlen(x) > 32 ? 0 : 32 - (int)strlen(x), "", bp.str);


            #define CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(l, x)                            \

            
                ret = av_channel_layout_channel_from_index(&layout, x);                \

            
                if (ret < 0)                                                           \

            
                    ret = -1;                                                          \

            
                printf("On \"%s\" layout with %2d: %8d\n", l,  x, ret)


            #define CHANNEL_LAYOUT_SUBSET(l, xstr, x)                                  \

            
                mask = av_channel_layout_subset(&layout, x);                           \

            
                printf("On \"%s\" layout with %-22s 0x%"PRIx64"\n", l, xstr, mask)


            #define CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(l, x)                            \

            
                ret = av_channel_layout_index_from_channel(&layout, x);                \

            
                if (ret < 0)                                                           \

            
                    ret = -1;                                                          \

            
                printf("On \"%s\" layout with %-23s %3d\n", l, AV_STRINGIFY(x)":", ret)


            #define CHANNEL_LAYOUT_CHANNEL_FROM_STRING(l, x)                           \

            
                ret = av_channel_layout_channel_from_string(&layout, x);               \

            
                if (ret < 0)                                                           \

            
                    ret = -1;                                                          \

            
                printf("On \"%s\" layout with %-21s %3d\n", bp.str, AV_STRINGIFY(x)":", ret);


            #define CHANNEL_LAYOUT_INDEX_FROM_STRING(l, x)                             \

            
                ret = av_channel_layout_index_from_string(&layout, x);                 \

            
                if (ret < 0)                                                           \

            
                    ret = -1;                                                          \

            
                printf("On \"%s\" layout with %-20s %3d\n", l, AV_STRINGIFY(x)":", ret);


            int main(void)

            
            {

            
                const AVChannelLayout *playout;

            
                AVChannelLayout layout = { 0 }, layout2 = { 0 };

            
                AVBPrint bp;

            
                void *iter = NULL;

            
                uint64_t mask;

            
                int ret;


                av_bprint_init(&bp, 64, AV_BPRINT_SIZE_AUTOMATIC);


                printf("Testing av_channel_layout_standard\n");

            
                while (playout = av_channel_layout_standard(&iter)) {

            
                    av_channel_layout_describe_bprint(playout, &bp);

            
                    printf("%-14s ", bp.str);

            
                    av_bprint_clear(&bp);

            
                    for (int i = 0; i < 63; i++) {

            
                        int idx = av_channel_layout_index_from_channel(playout, i);

            
                        if (idx >= 0) {

            
                            if (idx)

            
                                av_bprintf(&bp, "+");

            
                            av_channel_name_bprint(&bp, i);

            
                        }

            
                    }

            
                    printf("%s\n", bp.str);

            
                    av_bprint_clear(&bp);

            
                }


                printf("\nTesting av_channel_name\n");

            
                CHANNEL_NAME(AV_CHAN_FRONT_LEFT);

            
                CHANNEL_NAME(AV_CHAN_FRONT_RIGHT);

            
                CHANNEL_NAME(63);

            
                CHANNEL_NAME(AV_CHAN_AMBISONIC_BASE);

            
                CHANNEL_NAME(AV_CHAN_AMBISONIC_END);


                printf("Testing av_channel_description\n");

            
                CHANNEL_DESCRIPTION(AV_CHAN_FRONT_LEFT);

            
                CHANNEL_DESCRIPTION(AV_CHAN_FRONT_RIGHT);

            
                CHANNEL_DESCRIPTION(63);

            
                CHANNEL_DESCRIPTION(AV_CHAN_AMBISONIC_BASE);

            
                CHANNEL_DESCRIPTION(AV_CHAN_AMBISONIC_END);


                printf("\nTesting av_channel_from_string\n");

            
                CHANNEL_FROM_STRING("FL");

            
                CHANNEL_FROM_STRING("FR");

            
                CHANNEL_FROM_STRING("USR63");

            
                CHANNEL_FROM_STRING("AMBI0");

            
                CHANNEL_FROM_STRING("AMBI1023");

            
                CHANNEL_FROM_STRING("AMBI1024");

            
                CHANNEL_FROM_STRING("Dummy");

            
                CHANNEL_FROM_STRING("FL@Foo");

            
                CHANNEL_FROM_STRING("Foo@FL");

            
                CHANNEL_FROM_STRING("@FL");


                printf("\n==Native layouts==\n");


                printf("\nTesting av_channel_layout_from_string\n");

            
                CHANNEL_LAYOUT_FROM_STRING("0x3f");

            
                CHANNEL_LAYOUT_FROM_STRING("63");

            
                CHANNEL_LAYOUT_FROM_STRING("6c");

            
                CHANNEL_LAYOUT_FROM_STRING("6C");

            
                CHANNEL_LAYOUT_FROM_STRING("6 channels");

            
                CHANNEL_LAYOUT_FROM_STRING("6 channels (FL+FR+FC+LFE+BL+BR)");

            
                CHANNEL_LAYOUT_FROM_STRING("FL+FR+FC+LFE+BL+BR");

            
                CHANNEL_LAYOUT_FROM_STRING("5.1");

            
                CHANNEL_LAYOUT_FROM_STRING("FL+FR+USR63");

            
                CHANNEL_LAYOUT_FROM_STRING("FL+FR+FC+LFE+SL+SR");

            
                CHANNEL_LAYOUT_FROM_STRING("5.1(side)");


                printf("\nTesting av_channel_layout_from_mask\n");

            
                CHANNEL_LAYOUT_FROM_MASK(AV_CH_LAYOUT_5POINT1);

            
                printf("With AV_CH_LAYOUT_5POINT1: %25s\n", bp.str);


                printf("\nTesting av_channel_layout_channel_from_index\n");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 0);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 1);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 2);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 3);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 4);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 5);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 6);


                printf("\nTesting av_channel_layout_index_from_channel\n");

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_LEFT);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_RIGHT);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_CENTER);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_LOW_FREQUENCY);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_SIDE_LEFT);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_SIDE_RIGHT);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_BACK_CENTER);


                printf("\nTesting av_channel_layout_channel_from_string\n");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FL");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FR");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FC");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "LFE");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "SL");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "SR");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "BC");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "@");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "@Foo");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FL@Foo");


                printf("\nTesting av_channel_layout_index_from_string\n");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FL");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FR");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FC");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "LFE");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "SL");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "SR");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "BC");


                printf("\nTesting av_channel_layout_subset\n");

            
                CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_STEREO:",  AV_CH_LAYOUT_STEREO);

            
                CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_2POINT1:", AV_CH_LAYOUT_2POINT1);

            
                CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_4POINT1:", AV_CH_LAYOUT_4POINT1);


                printf("\n==Custom layouts==\n");


                printf("\nTesting av_channel_layout_from_string\n");

            
                CHANNEL_LAYOUT_FROM_STRING("FL+FR+FC+BL+BR+LFE");

            
                CHANNEL_LAYOUT_FROM_STRING("2 channels (FR+FL)");

            
                CHANNEL_LAYOUT_FROM_STRING("2 channels (AMBI1023+FL)");

            
                CHANNEL_LAYOUT_FROM_STRING("3 channels (FR+FL)");

            
                CHANNEL_LAYOUT_FROM_STRING("-3 channels (FR+FL)");

            
                CHANNEL_LAYOUT_FROM_STRING("0 channels ()");

            
                CHANNEL_LAYOUT_FROM_STRING("2 channels (FL+FR");

            
                CHANNEL_LAYOUT_FROM_STRING("ambisonic 1+FR+FL");

            
                CHANNEL_LAYOUT_FROM_STRING("ambisonic 2+FC@Foo");

            
                CHANNEL_LAYOUT_FROM_STRING("FL@Foo+FR@Bar");

            
                CHANNEL_LAYOUT_FROM_STRING("FL+stereo");

            
                CHANNEL_LAYOUT_FROM_STRING("stereo+stereo");

            
                CHANNEL_LAYOUT_FROM_STRING("stereo@Boo");

            
                CHANNEL_LAYOUT_FROM_STRING("");

            
                CHANNEL_LAYOUT_FROM_STRING("@");

            
                CHANNEL_LAYOUT_FROM_STRING("@Dummy");

            
                CHANNEL_LAYOUT_FROM_STRING("@FL");

            
                CHANNEL_LAYOUT_FROM_STRING("Dummy");

            
                CHANNEL_LAYOUT_FROM_STRING("Dummy@FL");

            
                CHANNEL_LAYOUT_FROM_STRING("FR+Dummy");

            
                CHANNEL_LAYOUT_FROM_STRING("FR+Dummy@FL");

            
                CHANNEL_LAYOUT_FROM_STRING("UNK+UNSD");

            
                CHANNEL_LAYOUT_FROM_STRING("NONE");

            
                CHANNEL_LAYOUT_FROM_STRING("FR+@FL");

            
                CHANNEL_LAYOUT_FROM_STRING("FL+@");

            
                CHANNEL_LAYOUT_FROM_STRING("FR+FL@Foo+USR63@Foo");


                ret = av_channel_layout_copy(&layout2, &layout);

            
                if (ret < 0) {

            
                    printf("Copying channel layout \"FR+FL@Foo+USR63@Foo\" failed; "

            
                           "ret %d\n", ret);

            
                }

            
                ret = av_channel_layout_compare(&layout, &layout2);

            
                if (ret)

            
                    printf("Channel layout and its copy compare unequal; ret: %d\n", ret);


                printf("\nTesting av_channel_layout_index_from_string\n");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FR");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FL");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "USR63");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "Foo");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "@Foo");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FR@Foo");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FL@Foo");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "USR63@Foo");

            
                CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "BC");


                printf("\nTesting av_channel_layout_channel_from_string\n");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FR");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FL");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "USR63");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "Foo");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "@Foo");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FR@Foo");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FL@Foo");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "USR63@Foo");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "BC");


                printf("\nTesting av_channel_layout_index_from_channel\n");

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_RIGHT);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_LEFT);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, 63);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_BACK_CENTER);


                printf("\nTesting av_channel_layout_channel_from_index\n");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 0);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 1);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 2);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 3);


                printf("\nTesting av_channel_layout_subset\n");

            
                CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_STEREO:", AV_CH_LAYOUT_STEREO);

            
                CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_QUAD:", AV_CH_LAYOUT_QUAD);


                printf("\n==Ambisonic layouts==\n");


                printf("\nTesting av_channel_layout_from_string\n");

            
                CHANNEL_LAYOUT_FROM_STRING("ambisonic 1");

            
                CHANNEL_LAYOUT_FROM_STRING("ambisonic 2+stereo");


                printf("\nTesting av_channel_layout_index_from_channel\n");

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_AMBISONIC_BASE);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_LEFT);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_RIGHT);

            
                CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_BACK_CENTER);


                printf("\nTesting av_channel_layout_channel_from_index\n");

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 0);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 9);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 10);

            
                CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 11);


                printf("\nTesting av_channel_layout_subset\n");

            
                CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_STEREO:", AV_CH_LAYOUT_STEREO);

            
                CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_QUAD:", AV_CH_LAYOUT_QUAD);


                av_channel_layout_uninit(&layout);

            
                av_channel_layout_uninit(&layout2);


                printf("\nTesting av_channel_layout_retype\n");

            
                {

            
                    const char* layouts[] = {

            
                        "FL@Boo",

            
                        "stereo",

            
                        "FR+FL",

            
                        "ambisonic 2+stereo",

            
                        "2C",

            
                        NULL

            
                    };

            
                    for (int i = 0; layouts[i]; i++)

            
                        printf("With \"%s\": %s\n", layouts[i], channel_layout_retype(&layout, &bp, layouts[i]));

            
                }

            
                av_bprint_finalize(&bp, NULL);


                return 0;

            
            }
	/*
	* Copyright (c) 2021 James Almer
	*
	* 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 <inttypes.h>
	#include <stdio.h>
	#include <string.h>

	#include "libavutil/bprint.h"
	#include "libavutil/channel_layout.h"
	#include "libavutil/error.h"
	#include "libavutil/internal.h"
	#include "libavutil/macros.h"
	#include "libavutil/mem.h"

	#define BPRINT_ARGS1(bp, ...) (bp), __VA_ARGS__
	#define BPRINT_ARGS0(bp, ...) __VA_ARGS__, (bp)
	#define ORD_ARGS1(str, size, ...) (str), (size), __VA_ARGS__
	#define ORD_ARGS0(str, size, ...) __VA_ARGS__, (str), (size)

	// This macro presumes the AVBPrint to have been cleared before usage.
	#define CMP_BPRINT_AND_NONBPRINT(bp, func_name, ARG_ORDER, ...) do { \
	char *str; \
	int size; \
	func_name ## _bprint(BPRINT_ARGS ## ARG_ORDER((bp), __VA_ARGS__)); \
	if (strlen((bp)->str) != (bp)->len) { \
	printf("strlen of AVBPrint-string returned by "#func_name"_bprint" \
	" differs from AVBPrint.len: %"SIZE_SPECIFIER" vs. %u\n", \
	strlen((bp)->str), (bp)->len); \
	break; \
	} \
	size = func_name(ORD_ARGS ## ARG_ORDER(NULL, 0, __VA_ARGS__)); \
	if (size <= 0) { \
	printf(#func_name " returned %d\n", size); \
	break; \
	} \
	if ((bp)->len != size - 1) { \
	printf("Return value %d of " #func_name " inconsistent with length"\
	" %u obtained from corresponding bprint version\n", \
	size, (bp)->len); \
	break; \
	} \
	str = av_malloc(size); \
	if (!str) { \
	printf("string of size %d could not be allocated.\n", size); \
	break; \
	} \
	size = func_name(ORD_ARGS ## ARG_ORDER(str, size, __VA_ARGS__)); \
	if (size <= 0 \|\| (bp)->len != size - 1) { \
	printf("Return value %d of " #func_name " inconsistent with length"\
	" %d obtained in first pass.\n", size, (bp)->len); \
	av_free(str); \
	break; \
	} \
	if (strcmp(str, (bp)->str)) { \
	printf("Ordinary and _bprint versions of "#func_name" disagree: " \
	"'%s' vs. '%s'\n", str, (bp)->str); \
	av_free(str); \
	break; \
	} \
	av_free(str); \
	} while (0)


	static void channel_name(AVBPrint *bp, enum AVChannel channel)
	{
	av_bprint_clear(bp);
	CMP_BPRINT_AND_NONBPRINT(bp, av_channel_name, 1, channel);
	}

	static void channel_description(AVBPrint *bp, enum AVChannel channel)
	{
	av_bprint_clear(bp);
	CMP_BPRINT_AND_NONBPRINT(bp, av_channel_description, 1, channel);
	}

	static void channel_layout_from_mask(AVChannelLayout *layout,
	AVBPrint *bp, uint64_t channel_layout)
	{
	av_channel_layout_uninit(layout);
	av_bprint_clear(bp);
	if (!av_channel_layout_from_mask(layout, channel_layout) &&
	av_channel_layout_check(layout))
	CMP_BPRINT_AND_NONBPRINT(bp, av_channel_layout_describe, 0, layout);
	else
	av_bprintf(bp, "fail");
	}

	static void channel_layout_from_string(AVChannelLayout *layout,
	AVBPrint bp, const char channel_layout)
	{
	av_channel_layout_uninit(layout);
	av_bprint_clear(bp);
	if (!av_channel_layout_from_string(layout, channel_layout) &&
	av_channel_layout_check(layout))
	CMP_BPRINT_AND_NONBPRINT(bp, av_channel_layout_describe, 0, layout);
	else
	av_bprintf(bp, "fail");
	}

	static const char* channel_order_names[] = {"UNSPEC", "NATIVE", "CUSTOM", "AMBI"};

	static void describe_type(AVBPrint bp, AVChannelLayout layout)
	{
	if (layout->order >= 0 && layout->order < FF_ARRAY_ELEMS(channel_order_names)) {
	av_bprintf(bp, "%-6s (", channel_order_names[layout->order]);
	av_channel_layout_describe_bprint(layout, bp);
	av_bprintf(bp, ")");
	} else {
	av_bprintf(bp, "???");
	}
	}

	static const char channel_layout_retype(AVChannelLayout layout, AVBPrint bp, const char channel_layout)
	{
	av_channel_layout_uninit(layout);
	av_bprint_clear(bp);
	if (!av_channel_layout_from_string(layout, channel_layout) &&
	av_channel_layout_check(layout)) {
	describe_type(bp, layout);
	for (int i = 0; i < FF_CHANNEL_ORDER_NB; i++) {
	int ret;
	AVChannelLayout copy = {0};
	av_bprintf(bp, "\n ");
	if (av_channel_layout_copy(&copy, layout) < 0)
	return "nomem";
	ret = av_channel_layout_retype(&copy, i, 0);
	if (ret < 0 && (copy.order != layout->order \|\| av_channel_layout_compare(&copy, layout)))
	av_bprintf(bp, "failed to keep existing layout on failure");
	if (ret >= 0 && copy.order != i)
	av_bprintf(bp, "returned success but did not change order");
	if (ret == AVERROR(ENOSYS)) {
	av_bprintf(bp, " != %s", channel_order_names[i]);
	} else if (ret < 0) {
	av_bprintf(bp, "FAIL");
	} else {
	av_bprintf(bp, " %s ", ret ? "~~" : "==");
	describe_type(bp, &copy);
	}
	av_channel_layout_uninit(&copy);
	}
	} else {
	av_bprintf(bp, "fail");
	}
	return bp->str;
	}

	#define CHANNEL_NAME(x) \
	channel_name(&bp, (x)); \
	printf("With %-32s %14s\n", AV_STRINGIFY(x)":", bp.str)

	#define CHANNEL_DESCRIPTION(x) \
	channel_description(&bp, (x)); \
	printf("With %-23s %23s\n", AV_STRINGIFY(x)":", bp.str);

	#define CHANNEL_FROM_STRING(x) \
	printf("With %-38s %8d\n", AV_STRINGIFY(x)":", av_channel_from_string(x))

	#define CHANNEL_LAYOUT_FROM_MASK(x) \
	channel_layout_from_mask(&layout, &bp, (x));

	#define CHANNEL_LAYOUT_FROM_STRING(x) \
	channel_layout_from_string(&layout, &bp, (x)); \
	printf("With \"%s\":%*s %32s\n", x, strlen(x) > 32 ? 0 : 32 - (int)strlen(x), "", bp.str);

	#define CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(l, x) \
	ret = av_channel_layout_channel_from_index(&layout, x); \
	if (ret < 0) \
	ret = -1; \
	printf("On \"%s\" layout with %2d: %8d\n", l, x, ret)

	#define CHANNEL_LAYOUT_SUBSET(l, xstr, x) \
	mask = av_channel_layout_subset(&layout, x); \
	printf("On \"%s\" layout with %-22s 0x%"PRIx64"\n", l, xstr, mask)

	#define CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(l, x) \
	ret = av_channel_layout_index_from_channel(&layout, x); \
	if (ret < 0) \
	ret = -1; \
	printf("On \"%s\" layout with %-23s %3d\n", l, AV_STRINGIFY(x)":", ret)

	#define CHANNEL_LAYOUT_CHANNEL_FROM_STRING(l, x) \
	ret = av_channel_layout_channel_from_string(&layout, x); \
	if (ret < 0) \
	ret = -1; \
	printf("On \"%s\" layout with %-21s %3d\n", bp.str, AV_STRINGIFY(x)":", ret);

	#define CHANNEL_LAYOUT_INDEX_FROM_STRING(l, x) \
	ret = av_channel_layout_index_from_string(&layout, x); \
	if (ret < 0) \
	ret = -1; \
	printf("On \"%s\" layout with %-20s %3d\n", l, AV_STRINGIFY(x)":", ret);

	int main(void)
	{
	const AVChannelLayout *playout;
	AVChannelLayout layout = { 0 }, layout2 = { 0 };
	AVBPrint bp;
	void *iter = NULL;
	uint64_t mask;
	int ret;

	av_bprint_init(&bp, 64, AV_BPRINT_SIZE_AUTOMATIC);

	printf("Testing av_channel_layout_standard\n");
	while (playout = av_channel_layout_standard(&iter)) {
	av_channel_layout_describe_bprint(playout, &bp);
	printf("%-14s ", bp.str);
	av_bprint_clear(&bp);
	for (int i = 0; i < 63; i++) {
	int idx = av_channel_layout_index_from_channel(playout, i);
	if (idx >= 0) {
	if (idx)
	av_bprintf(&bp, "+");
	av_channel_name_bprint(&bp, i);
	}
	}
	printf("%s\n", bp.str);
	av_bprint_clear(&bp);
	}

	printf("\nTesting av_channel_name\n");
	CHANNEL_NAME(AV_CHAN_FRONT_LEFT);
	CHANNEL_NAME(AV_CHAN_FRONT_RIGHT);
	CHANNEL_NAME(63);
	CHANNEL_NAME(AV_CHAN_AMBISONIC_BASE);
	CHANNEL_NAME(AV_CHAN_AMBISONIC_END);

	printf("Testing av_channel_description\n");
	CHANNEL_DESCRIPTION(AV_CHAN_FRONT_LEFT);
	CHANNEL_DESCRIPTION(AV_CHAN_FRONT_RIGHT);
	CHANNEL_DESCRIPTION(63);
	CHANNEL_DESCRIPTION(AV_CHAN_AMBISONIC_BASE);
	CHANNEL_DESCRIPTION(AV_CHAN_AMBISONIC_END);

	printf("\nTesting av_channel_from_string\n");
	CHANNEL_FROM_STRING("FL");
	CHANNEL_FROM_STRING("FR");
	CHANNEL_FROM_STRING("USR63");
	CHANNEL_FROM_STRING("AMBI0");
	CHANNEL_FROM_STRING("AMBI1023");
	CHANNEL_FROM_STRING("AMBI1024");
	CHANNEL_FROM_STRING("Dummy");
	CHANNEL_FROM_STRING("FL@Foo");
	CHANNEL_FROM_STRING("Foo@FL");
	CHANNEL_FROM_STRING("@FL");

	printf("\n==Native layouts==\n");

	printf("\nTesting av_channel_layout_from_string\n");
	CHANNEL_LAYOUT_FROM_STRING("0x3f");
	CHANNEL_LAYOUT_FROM_STRING("63");
	CHANNEL_LAYOUT_FROM_STRING("6c");
	CHANNEL_LAYOUT_FROM_STRING("6C");
	CHANNEL_LAYOUT_FROM_STRING("6 channels");
	CHANNEL_LAYOUT_FROM_STRING("6 channels (FL+FR+FC+LFE+BL+BR)");
	CHANNEL_LAYOUT_FROM_STRING("FL+FR+FC+LFE+BL+BR");
	CHANNEL_LAYOUT_FROM_STRING("5.1");
	CHANNEL_LAYOUT_FROM_STRING("FL+FR+USR63");
	CHANNEL_LAYOUT_FROM_STRING("FL+FR+FC+LFE+SL+SR");
	CHANNEL_LAYOUT_FROM_STRING("5.1(side)");

	printf("\nTesting av_channel_layout_from_mask\n");
	CHANNEL_LAYOUT_FROM_MASK(AV_CH_LAYOUT_5POINT1);
	printf("With AV_CH_LAYOUT_5POINT1: %25s\n", bp.str);

	printf("\nTesting av_channel_layout_channel_from_index\n");
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 0);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 1);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 2);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 3);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 4);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 5);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 6);

	printf("\nTesting av_channel_layout_index_from_channel\n");
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_LEFT);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_RIGHT);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_CENTER);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_LOW_FREQUENCY);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_SIDE_LEFT);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_SIDE_RIGHT);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_BACK_CENTER);

	printf("\nTesting av_channel_layout_channel_from_string\n");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FL");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FR");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FC");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "LFE");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "SL");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "SR");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "BC");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "@");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "@Foo");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FL@Foo");

	printf("\nTesting av_channel_layout_index_from_string\n");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FL");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FR");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FC");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "LFE");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "SL");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "SR");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "BC");

	printf("\nTesting av_channel_layout_subset\n");
	CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_STEREO:", AV_CH_LAYOUT_STEREO);
	CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_2POINT1:", AV_CH_LAYOUT_2POINT1);
	CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_4POINT1:", AV_CH_LAYOUT_4POINT1);

	printf("\n==Custom layouts==\n");

	printf("\nTesting av_channel_layout_from_string\n");
	CHANNEL_LAYOUT_FROM_STRING("FL+FR+FC+BL+BR+LFE");
	CHANNEL_LAYOUT_FROM_STRING("2 channels (FR+FL)");
	CHANNEL_LAYOUT_FROM_STRING("2 channels (AMBI1023+FL)");
	CHANNEL_LAYOUT_FROM_STRING("3 channels (FR+FL)");
	CHANNEL_LAYOUT_FROM_STRING("-3 channels (FR+FL)");
	CHANNEL_LAYOUT_FROM_STRING("0 channels ()");
	CHANNEL_LAYOUT_FROM_STRING("2 channels (FL+FR");
	CHANNEL_LAYOUT_FROM_STRING("ambisonic 1+FR+FL");
	CHANNEL_LAYOUT_FROM_STRING("ambisonic 2+FC@Foo");
	CHANNEL_LAYOUT_FROM_STRING("FL@Foo+FR@Bar");
	CHANNEL_LAYOUT_FROM_STRING("FL+stereo");
	CHANNEL_LAYOUT_FROM_STRING("stereo+stereo");
	CHANNEL_LAYOUT_FROM_STRING("stereo@Boo");
	CHANNEL_LAYOUT_FROM_STRING("");
	CHANNEL_LAYOUT_FROM_STRING("@");
	CHANNEL_LAYOUT_FROM_STRING("@Dummy");
	CHANNEL_LAYOUT_FROM_STRING("@FL");
	CHANNEL_LAYOUT_FROM_STRING("Dummy");
	CHANNEL_LAYOUT_FROM_STRING("Dummy@FL");
	CHANNEL_LAYOUT_FROM_STRING("FR+Dummy");
	CHANNEL_LAYOUT_FROM_STRING("FR+Dummy@FL");
	CHANNEL_LAYOUT_FROM_STRING("UNK+UNSD");
	CHANNEL_LAYOUT_FROM_STRING("NONE");
	CHANNEL_LAYOUT_FROM_STRING("FR+@FL");
	CHANNEL_LAYOUT_FROM_STRING("FL+@");
	CHANNEL_LAYOUT_FROM_STRING("FR+FL@Foo+USR63@Foo");

	ret = av_channel_layout_copy(&layout2, &layout);
	if (ret < 0) {
	printf("Copying channel layout \"FR+FL@Foo+USR63@Foo\" failed; "
	"ret %d\n", ret);
	}
	ret = av_channel_layout_compare(&layout, &layout2);
	if (ret)
	printf("Channel layout and its copy compare unequal; ret: %d\n", ret);

	printf("\nTesting av_channel_layout_index_from_string\n");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FR");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FL");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "USR63");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "Foo");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "@Foo");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FR@Foo");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "FL@Foo");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "USR63@Foo");
	CHANNEL_LAYOUT_INDEX_FROM_STRING(bp.str, "BC");

	printf("\nTesting av_channel_layout_channel_from_string\n");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FR");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FL");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "USR63");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "Foo");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "@Foo");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FR@Foo");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "FL@Foo");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "USR63@Foo");
	CHANNEL_LAYOUT_CHANNEL_FROM_STRING(bp.str, "BC");

	printf("\nTesting av_channel_layout_index_from_channel\n");
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_RIGHT);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_LEFT);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, 63);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_BACK_CENTER);

	printf("\nTesting av_channel_layout_channel_from_index\n");
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 0);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 1);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 2);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 3);

	printf("\nTesting av_channel_layout_subset\n");
	CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_STEREO:", AV_CH_LAYOUT_STEREO);
	CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_QUAD:", AV_CH_LAYOUT_QUAD);

	printf("\n==Ambisonic layouts==\n");

	printf("\nTesting av_channel_layout_from_string\n");
	CHANNEL_LAYOUT_FROM_STRING("ambisonic 1");
	CHANNEL_LAYOUT_FROM_STRING("ambisonic 2+stereo");

	printf("\nTesting av_channel_layout_index_from_channel\n");
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_AMBISONIC_BASE);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_LEFT);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_FRONT_RIGHT);
	CHANNEL_LAYOUT_INDEX_FROM_CHANNEL(bp.str, AV_CHAN_BACK_CENTER);

	printf("\nTesting av_channel_layout_channel_from_index\n");
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 0);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 9);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 10);
	CHANNEL_LAYOUT_CHANNEL_FROM_INDEX(bp.str, 11);

	printf("\nTesting av_channel_layout_subset\n");
	CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_STEREO:", AV_CH_LAYOUT_STEREO);
	CHANNEL_LAYOUT_SUBSET(bp.str, "AV_CH_LAYOUT_QUAD:", AV_CH_LAYOUT_QUAD);

	av_channel_layout_uninit(&layout);
	av_channel_layout_uninit(&layout2);

	printf("\nTesting av_channel_layout_retype\n");
	{
	const char* layouts[] = {
	"FL@Boo",
	"stereo",
	"FR+FL",
	"ambisonic 2+stereo",
	"2C",
	NULL
	};
	for (int i = 0; layouts[i]; i++)
	printf("With \"%s\": %s\n", layouts[i], channel_layout_retype(&layout, &bp, layouts[i]));
	}
	av_bprint_finalize(&bp, NULL);

	return 0;
	}