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mpv/video/img_format.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 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.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <string.h>
#include <libavcodec/avcodec.h>
#include <libavutil/imgutils.h>
#include <libavutil/pixfmt.h>
#include <libavutil/pixdesc.h>
#include "config.h"
#include "video/img_format.h"
#include "video/mp_image.h"
#include "video/fmt-conversion.h"
struct mp_imgfmt_entry {
const char *name;
// Valid if flags!=0.
// This can be incomplete, and missing fields are filled in:
// - sets num_planes and bpp[], derived from comps[] (rounds to bytes)
// - sets MP_IMGFLAG_GRAY, derived from comps[]
// - sets MP_IMGFLAG_ALPHA, derived from comps[]
// - sets align_x/y if 0, derived from chroma shift
// - sets xs[]/ys[] always, derived from num_planes/chroma_shift
// - sets MP_IMGFLAG_HAS_COMPS|MP_IMGFLAG_NE if num_planes>0
// - sets MP_IMGFLAG_TYPE_UINT if no other type set
// - sets id to mp_imgfmt_list[] implied format
struct mp_imgfmt_desc desc;
};
#define FRINGE_GBRP(def, dname, b) \
[def - IMGFMT_CUST_BASE] = { \
.name = dname, \
.desc = { .flags = MP_IMGFLAG_COLOR_RGB, \
.comps = { {2, 0, 8, (b) - 8}, {0, 0, 8, (b) - 8}, \
{1, 0, 8, (b) - 8}, }, }}
#define FLOAT_YUV(def, dname, xs, ys, a) \
[def - IMGFMT_CUST_BASE] = { \
.name = dname, \
.desc = { .flags = MP_IMGFLAG_COLOR_YUV | MP_IMGFLAG_TYPE_FLOAT, \
.chroma_xs = xs, .chroma_ys = ys, \
.comps = { {0, 0, 32}, {1, 0, 32}, {2, 0, 32}, \
{3 * (a), 0, 32 * (a)} }, }}
static const struct mp_imgfmt_entry mp_imgfmt_list[] = {
// not in ffmpeg
[IMGFMT_VDPAU_OUTPUT - IMGFMT_CUST_BASE] = {
.name = "vdpau_output",
.desc = {
.flags = MP_IMGFLAG_NE | MP_IMGFLAG_RGB | MP_IMGFLAG_HWACCEL,
},
},
[IMGFMT_RGB30 - IMGFMT_CUST_BASE] = {
.name = "rgb30",
.desc = {
.flags = MP_IMGFLAG_RGB,
.comps = { {0, 20, 10}, {0, 10, 10}, {0, 0, 10} },
},
},
[IMGFMT_YAP8 - IMGFMT_CUST_BASE] = {
.name = "yap8",
.desc = {
.flags = MP_IMGFLAG_COLOR_YUV,
.comps = { {0, 0, 8}, {0}, {0}, {1, 0, 8} },
},
},
[IMGFMT_YAP16 - IMGFMT_CUST_BASE] = {
.name = "yap16",
.desc = {
.flags = MP_IMGFLAG_COLOR_YUV,
.comps = { {0, 0, 16}, {0}, {0}, {1, 0, 16} },
},
},
[IMGFMT_Y1 - IMGFMT_CUST_BASE] = {
.name = "y1",
.desc = {
.flags = MP_IMGFLAG_COLOR_RGB,
.comps = { {0, 0, 8, -7} },
},
},
[IMGFMT_YAPF - IMGFMT_CUST_BASE] = {
.name = "grayaf32", // try to mimic ffmpeg naming convention
.desc = {
.flags = MP_IMGFLAG_COLOR_YUV | MP_IMGFLAG_TYPE_FLOAT,
.comps = { {0, 0, 32}, {0}, {0}, {1, 0, 32} },
},
},
FLOAT_YUV(IMGFMT_444PF, "yuv444pf", 0, 0, 0),
FLOAT_YUV(IMGFMT_444APF, "yuva444pf", 0, 0, 1),
FLOAT_YUV(IMGFMT_420PF, "yuv420pf", 1, 1, 0),
FLOAT_YUV(IMGFMT_420APF, "yuva420pf", 1, 1, 1),
FLOAT_YUV(IMGFMT_422PF, "yuv422pf", 1, 0, 0),
FLOAT_YUV(IMGFMT_422APF, "yuva422pf", 1, 0, 1),
FLOAT_YUV(IMGFMT_440PF, "yuv440pf", 0, 1, 0),
FLOAT_YUV(IMGFMT_440APF, "yuva440pf", 0, 1, 1),
FLOAT_YUV(IMGFMT_410PF, "yuv410pf", 2, 2, 0),
FLOAT_YUV(IMGFMT_410APF, "yuva410pf", 2, 2, 1),
FLOAT_YUV(IMGFMT_411PF, "yuv411pf", 2, 0, 0),
FLOAT_YUV(IMGFMT_411APF, "yuva411pf", 2, 0, 1),
FRINGE_GBRP(IMGFMT_GBRP1, "gbrp1", 1),
FRINGE_GBRP(IMGFMT_GBRP2, "gbrp2", 2),
FRINGE_GBRP(IMGFMT_GBRP3, "gbrp3", 3),
FRINGE_GBRP(IMGFMT_GBRP4, "gbrp4", 4),
FRINGE_GBRP(IMGFMT_GBRP5, "gbrp5", 5),
FRINGE_GBRP(IMGFMT_GBRP6, "gbrp6", 6),
// in FFmpeg, but FFmpeg names have an annoying "_vld" suffix
[IMGFMT_VIDEOTOOLBOX - IMGFMT_CUST_BASE] = {
.name = "videotoolbox",
},
[IMGFMT_VAAPI - IMGFMT_CUST_BASE] = {
.name = "vaapi",
},
};
static const struct mp_imgfmt_entry *get_mp_desc(int imgfmt)
{
if (imgfmt < IMGFMT_CUST_BASE)
return NULL;
int index = imgfmt - IMGFMT_CUST_BASE;
if (index >= MP_ARRAY_SIZE(mp_imgfmt_list))
return NULL;
const struct mp_imgfmt_entry *e = &mp_imgfmt_list[index];
return e->name ? e : NULL;
}
char **mp_imgfmt_name_list(void)
{
int count = IMGFMT_END - IMGFMT_START;
char **list = talloc_zero_array(NULL, char *, count + 1);
int num = 0;
for (int n = IMGFMT_START; n < IMGFMT_END; n++) {
const char *name = mp_imgfmt_to_name(n);
if (strcmp(name, "unknown") != 0)
list[num++] = talloc_strdup(list, name);
}
return list;
}
int mp_imgfmt_from_name(bstr name)
{
if (bstr_equals0(name, "none"))
return 0;
for (int n = 0; n < MP_ARRAY_SIZE(mp_imgfmt_list); n++) {
const struct mp_imgfmt_entry *p = &mp_imgfmt_list[n];
if (p->name && bstr_equals0(name, p->name))
return IMGFMT_CUST_BASE + n;
}
return pixfmt2imgfmt(av_get_pix_fmt(mp_tprintf(80, "%.*s", BSTR_P(name))));
}
char *mp_imgfmt_to_name_buf(char *buf, size_t buf_size, int fmt)
{
const struct mp_imgfmt_entry *p = get_mp_desc(fmt);
const char *name = p ? p->name : NULL;
if (!name) {
const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(imgfmt2pixfmt(fmt));
if (pixdesc)
name = pixdesc->name;
}
if (!name)
name = "unknown";
snprintf(buf, buf_size, "%s", name);
int len = strlen(buf);
if (len > 2 && buf[len - 2] == MP_SELECT_LE_BE('l', 'b') && buf[len - 1] == 'e')
buf[len - 2] = '\0';
return buf;
}
static void fill_pixdesc_layout(struct mp_imgfmt_desc *desc,
enum AVPixelFormat fmt,
const AVPixFmtDescriptor *pd)
{
if (pd->flags & AV_PIX_FMT_FLAG_PAL ||
pd->flags & AV_PIX_FMT_FLAG_HWACCEL)
goto fail;
bool has_alpha = pd->flags & AV_PIX_FMT_FLAG_ALPHA;
if (pd->nb_components != 1 + has_alpha &&
pd->nb_components != 3 + has_alpha)
goto fail;
// Very convenient: we assume we're always on little endian, and FFmpeg
// explicitly marks big endian formats => don't need to guess whether a
// format is little endian, or not affected by byte order.
bool is_be = pd->flags & AV_PIX_FMT_FLAG_BE;
// Packed sub-sampled YUV is very... special.
bool is_packed_ss_yuv = pd->log2_chroma_w && !pd->log2_chroma_h &&
pd->comp[1].plane == 0 && pd->comp[2].plane == 0 &&
pd->nb_components == 3;
if (is_packed_ss_yuv)
desc->bpp[0] = pd->comp[1].step * 8;
int el_bits = (pd->flags & AV_PIX_FMT_FLAG_BITSTREAM) ? 1 : 8;
for (int c = 0; c < pd->nb_components; c++) {
const AVComponentDescriptor *d = &pd->comp[c];
if (d->plane >= MP_MAX_PLANES)
goto fail;
desc->num_planes = MPMAX(desc->num_planes, d->plane + 1);
int plane_bits = desc->bpp[d->plane];
int c_bits = d->step * el_bits;
// The first component wins, because either all components result in
// the same value, or luma wins (luma always comes before chroma).
if (plane_bits) {
if (c_bits > plane_bits)
goto fail; // inconsistent
} else {
desc->bpp[d->plane] = plane_bits = c_bits;
}
int shift = d->shift;
// What the fuck: for some inexplicable reason, MONOB uses shift=7
// in pixdesc, which is basically out of bounds. Pixdesc bug?
// Make it behave like MONOW. (No, the bit-order is not different.)
if (fmt == AV_PIX_FMT_MONOBLACK)
shift = 0;
int offset = d->offset * el_bits;
// The pixdesc logic for reading and endian swapping is as follows
// (reverse engineered from av_read_image_line2()):
// - determine a word size that will include the component fully;
// this includes the "active" bits and the amount "shifted" away
// (for example shift=7/depth=18 => 32 bit word reading [31:0])
// - the same format can use different word sizes (e.g. bgr565: the R
// component at offset 0 is read as 8 bit; BG is read as 16 bits)
// - if BE flag is set, swap the word before proceeding
// - extract via shift and mask derived by depth
int word = mp_round_next_power_of_2(MPMAX(d->depth + shift, 8)) / 8;
// The purpose of this is unknown. It's an absurdity fished out of
// av_read_image_line2()'s implementation. It seems technically
// unnecessary, and provides no information. On the other hand, it
// compensates for seemingly bogus packed integer pixdescs; this
// is "why" some formats use d->offset = -1.
if (is_be && el_bits == 8 && word == 1)
offset += 8;
// Pixdesc's model requires accesses with varying word-sizes. This
// is complete bullshit, so we transform it into word swaps before
// further processing.
if (is_be && word == 1) {
// Probably packed RGB formats with varying word sizes. Assume
// the word access size is the entire pixel.
int logend = mp_log2(plane_bits) - 3;
if (!MP_IS_POWER_OF_2(plane_bits) || logend < 0 || logend > 3)
goto fail;
if (!desc->endian_shift)
desc->endian_shift = logend;
if (desc->endian_shift != logend)
goto fail;
offset = (1 << desc->endian_shift) * 8 - 8 - offset;
}
if (is_be && word > 1) {
int logend = mp_log2(word);
if (desc->endian_shift && desc->endian_shift != logend)
goto fail; // fortunately not needed/never happens
if (logend > 3)
goto fail;
desc->endian_shift = logend;
}
// We always use bit offsets; this doesn't lose any information,
// and pixdesc is merely more redundant.
offset += shift;
if (offset < 0 || offset >= (1 << 6))
goto fail;
if (offset + d->depth > plane_bits)
goto fail;
if (d->depth < 0 || d->depth >= (1 << 6))
goto fail;
desc->comps[c] = (struct mp_imgfmt_comp_desc){
.plane = d->plane,
.offset = offset,
.size = d->depth,
};
}
for (int p = 0; p < desc->num_planes; p++) {
if (!desc->bpp[p])
goto fail; // plane doesn't exist
}
// What the fuck: this is probably a pixdesc bug, so fix it.
if (fmt == AV_PIX_FMT_RGB8) {
desc->comps[2] = (struct mp_imgfmt_comp_desc){0, 0, 2};
desc->comps[1] = (struct mp_imgfmt_comp_desc){0, 2, 3};
desc->comps[0] = (struct mp_imgfmt_comp_desc){0, 5, 3};
}
// Overlap test. If any shared bits are happening, this is not a format we
// can represent (or it's something like Bayer: components in the same bits,
// but different alternating lines).
bool any_shared_bits = false;
bool any_shared_bytes = false;
for (int c = 0; c < pd->nb_components; c++) {
for (int i = 0; i < c; i++) {
struct mp_imgfmt_comp_desc *c1 = &desc->comps[c];
struct mp_imgfmt_comp_desc *c2 = &desc->comps[i];
if (c1->plane == c2->plane) {
if (c1->offset + c1->size > c2->offset &&
c2->offset + c2->size > c1->offset)
any_shared_bits = true;
if ((c1->offset + c1->size + 7) / 8u > c2->offset / 8u &&
(c2->offset + c2->size + 7) / 8u > c1->offset / 8u)
any_shared_bytes = true;
}
}
}
if (any_shared_bits) {
for (int c = 0; c < pd->nb_components; c++)
desc->comps[c] = (struct mp_imgfmt_comp_desc){0};
}
// Many important formats have padding within an access word. For example
// yuv420p10 has the upper 6 bit cleared to 0; P010 has the lower 6 bits
// cleared to 0. Pixdesc cannot represent that these bits are 0. There are
// other formats where padding is not guaranteed to be 0, but they are
// described in the same way.
// Apply a heuristic that is supposed to identify formats which use
// guaranteed 0 padding. This could fail, but nobody said this pixdesc crap
// is robust.
for (int c = 0; c < pd->nb_components; c++) {
struct mp_imgfmt_comp_desc *cd = &desc->comps[c];
// Note: rgb444 would defeat our heuristic if we checked only per comp.
// also, exclude "bitstream" formats due to monow/monob
int fsize = MP_ALIGN_UP(cd->size, 8);
if (!any_shared_bytes && el_bits == 8 && fsize != cd->size &&
fsize - cd->size <= (1 << 3))
{
if (!(cd->offset % 8u)) {
cd->pad = -(fsize - cd->size);
cd->size = fsize;
} else if (!((cd->offset + cd->size) % 8u)) {
cd->pad = fsize - cd->size;
cd->size = fsize;
cd->offset = MP_ALIGN_DOWN(cd->offset, 8);
}
}
}
// The alpha component always has ID 4 (index 3) in our representation, so
// move the alpha component to there.
if (has_alpha && pd->nb_components < 4) {
desc->comps[3] = desc->comps[pd->nb_components - 1];
desc->comps[pd->nb_components - 1] = (struct mp_imgfmt_comp_desc){0};
}
if (is_packed_ss_yuv) {
desc->flags |= MP_IMGFLAG_PACKED_SS_YUV;
desc->bpp[0] /= 1 << pd->log2_chroma_w;
} else if (!any_shared_bits) {
desc->flags |= MP_IMGFLAG_HAS_COMPS;
}
return;
fail:
for (int n = 0; n < 4; n++)
desc->comps[n] = (struct mp_imgfmt_comp_desc){0};
// Average bit size fallback.
desc->num_planes = av_pix_fmt_count_planes(fmt);
for (int p = 0; p < desc->num_planes; p++) {
int ls = av_image_get_linesize(fmt, 256, p);
desc->bpp[p] = ls > 0 ? ls * 8 / 256 : 0;
}
}
static bool mp_imgfmt_get_desc_from_pixdesc(int mpfmt, struct mp_imgfmt_desc *out)
{
enum AVPixelFormat fmt = imgfmt2pixfmt(mpfmt);
const AVPixFmtDescriptor *pd = av_pix_fmt_desc_get(fmt);
if (!pd || pd->nb_components > 4)
return false;
struct mp_imgfmt_desc desc = {
.id = mpfmt,
.chroma_xs = pd->log2_chroma_w,
.chroma_ys = pd->log2_chroma_h,
};
if (pd->flags & AV_PIX_FMT_FLAG_ALPHA)
desc.flags |= MP_IMGFLAG_ALPHA;
if (pd->flags & AV_PIX_FMT_FLAG_HWACCEL)
desc.flags |= MP_IMGFLAG_TYPE_HW;
// Pixdesc does not provide a flag for XYZ, so this is the best we can do.
if (strncmp(pd->name, "xyz", 3) == 0) {
desc.flags |= MP_IMGFLAG_COLOR_XYZ;
} else if (pd->flags & AV_PIX_FMT_FLAG_RGB) {
desc.flags |= MP_IMGFLAG_COLOR_RGB;
} else if (fmt == AV_PIX_FMT_MONOBLACK || fmt == AV_PIX_FMT_MONOWHITE) {
desc.flags |= MP_IMGFLAG_COLOR_RGB;
} else if (fmt == AV_PIX_FMT_PAL8) {
desc.flags |= MP_IMGFLAG_COLOR_RGB | MP_IMGFLAG_TYPE_PAL8;
}
if (pd->flags & AV_PIX_FMT_FLAG_FLOAT)
desc.flags |= MP_IMGFLAG_TYPE_FLOAT;
// Educated guess.
if (!(desc.flags & MP_IMGFLAG_COLOR_MASK) &&
!(desc.flags & MP_IMGFLAG_TYPE_HW))
desc.flags |= MP_IMGFLAG_COLOR_YUV;
desc.align_x = 1 << desc.chroma_xs;
desc.align_y = 1 << desc.chroma_ys;
fill_pixdesc_layout(&desc, fmt, pd);
if (desc.flags & (MP_IMGFLAG_HAS_COMPS | MP_IMGFLAG_PACKED_SS_YUV)) {
if (!(desc.flags & MP_IMGFLAG_TYPE_MASK))
desc.flags |= MP_IMGFLAG_TYPE_UINT;
}
if (desc.bpp[0] % 8u && (pd->flags & AV_PIX_FMT_FLAG_BITSTREAM))
desc.align_x = 8 / desc.bpp[0]; // expect power of 2
// Very heuristical.
bool is_be = desc.endian_shift > 0;
bool need_endian = (desc.comps[0].size % 8u && desc.bpp[0] > 8) ||
desc.comps[0].size > 8;
if (need_endian) {
desc.flags |= is_be ? MP_IMGFLAG_BE : MP_IMGFLAG_LE;
} else {
desc.flags |= MP_IMGFLAG_LE | MP_IMGFLAG_BE;
}
*out = desc;
return true;
}
bool mp_imgfmt_get_packed_yuv_locations(int imgfmt, uint8_t *luma_offsets)
{
struct mp_imgfmt_desc desc = mp_imgfmt_get_desc(imgfmt);
if (!(desc.flags & MP_IMGFLAG_PACKED_SS_YUV))
return false;
assert(desc.num_planes == 1);
// Guess at which positions the additional luma samples are. We iterate
// starting with the first byte, and then put a luma sample at places
// not covered by other luma/chroma.
// Pixdesc does not and can not provide this information. This heuristic
// may fail in certain cases. What a load of bullshit, right?
int lsize = desc.comps[0].size;
int cur_offset = 0;
for (int lsample = 1; lsample < (1 << desc.chroma_xs); lsample++) {
while (1) {
if (cur_offset + lsize > desc.bpp[0] * desc.align_x)
return false;
bool free = true;
for (int c = 0; c < 3; c++) {
struct mp_imgfmt_comp_desc *cd = &desc.comps[c];
if (!cd->size)
continue;
if (cd->offset + cd->size > cur_offset &&
cur_offset + lsize > cd->offset)
{
free = false;
break;
}
}
if (free)
break;
cur_offset += lsize;
}
luma_offsets[lsample] = cur_offset;
cur_offset += lsize;
}
luma_offsets[0] = desc.comps[0].offset;
return true;
}
static bool get_native_desc(int mpfmt, struct mp_imgfmt_desc *desc)
{
const struct mp_imgfmt_entry *p = get_mp_desc(mpfmt);
if (!p || !p->desc.flags)
return false;
*desc = p->desc;
// Fill in some fields mp_imgfmt_entry.desc is not required to set.
desc->id = mpfmt;
for (int n = 0; n < MP_NUM_COMPONENTS; n++) {
struct mp_imgfmt_comp_desc *cd = &desc->comps[n];
if (cd->size)
desc->num_planes = MPMAX(desc->num_planes, cd->plane + 1);
desc->bpp[cd->plane] =
MPMAX(desc->bpp[cd->plane], MP_ALIGN_UP(cd->offset + cd->size, 8));
}
if (!desc->align_x && !desc->align_y) {
desc->align_x = 1 << desc->chroma_xs;
desc->align_y = 1 << desc->chroma_ys;
}
if (desc->num_planes)
desc->flags |= MP_IMGFLAG_HAS_COMPS | MP_IMGFLAG_NE;
if (!(desc->flags & MP_IMGFLAG_TYPE_MASK))
desc->flags |= MP_IMGFLAG_TYPE_UINT;
return true;
}
int mp_imgfmt_desc_get_num_comps(struct mp_imgfmt_desc *desc)
{
int flags = desc->flags;
if (!(flags & MP_IMGFLAG_COLOR_MASK))
return 0;
return 3 + (flags & MP_IMGFLAG_GRAY ? -2 : 0) + !!(flags & MP_IMGFLAG_ALPHA);
}
struct mp_imgfmt_desc mp_imgfmt_get_desc(int mpfmt)
{
struct mp_imgfmt_desc desc;
if (!get_native_desc(mpfmt, &desc) &&
!mp_imgfmt_get_desc_from_pixdesc(mpfmt, &desc))
return (struct mp_imgfmt_desc){0};
for (int p = 0; p < desc.num_planes; p++) {
desc.xs[p] = (p == 1 || p == 2) ? desc.chroma_xs : 0;
desc.ys[p] = (p == 1 || p == 2) ? desc.chroma_ys : 0;
}
bool is_ba = desc.num_planes > 0;
for (int p = 0; p < desc.num_planes; p++)
is_ba = !(desc.bpp[p] % 8u);
if (is_ba)
desc.flags |= MP_IMGFLAG_BYTE_ALIGNED;
if (desc.flags & MP_IMGFLAG_HAS_COMPS) {
if (desc.comps[3].size)
desc.flags |= MP_IMGFLAG_ALPHA;
// Assuming all colors are (CCC+[A]) or (C+[A]), the latter being gray.
if (!desc.comps[1].size)
desc.flags |= MP_IMGFLAG_GRAY;
bool bb = true;
for (int n = 0; n < MP_NUM_COMPONENTS; n++) {
if (desc.comps[n].offset % 8u || desc.comps[n].size % 8u)
bb = false;
}
if (bb)
desc.flags |= MP_IMGFLAG_BYTES;
}
if ((desc.flags & (MP_IMGFLAG_YUV | MP_IMGFLAG_RGB))
&& (desc.flags & MP_IMGFLAG_HAS_COMPS)
&& (desc.flags & MP_IMGFLAG_BYTES)
&& ((desc.flags & MP_IMGFLAG_TYPE_MASK) == MP_IMGFLAG_TYPE_UINT))
{
int cnt = mp_imgfmt_desc_get_num_comps(&desc);
bool same_depth = true;
for (int p = 0; p < desc.num_planes; p++)
same_depth &= desc.bpp[p] == desc.bpp[0];
if (same_depth && cnt == desc.num_planes) {
if (desc.flags & MP_IMGFLAG_YUV) {
desc.flags |= MP_IMGFLAG_YUV_P;
} else {
desc.flags |= MP_IMGFLAG_RGB_P;
}
}
if (cnt == 3 && desc.num_planes == 2 &&
desc.bpp[1] == desc.bpp[0] * 2 &&
(desc.flags & MP_IMGFLAG_YUV))
{
desc.flags |= MP_IMGFLAG_YUV_NV;
}
}
return desc;
}
static bool validate_regular_imgfmt(const struct mp_regular_imgfmt *fmt)
{
bool present[MP_NUM_COMPONENTS] = {0};
int n_comp = 0;
for (int n = 0; n < fmt->num_planes; n++) {
const struct mp_regular_imgfmt_plane *plane = &fmt->planes[n];
n_comp += plane->num_components;
if (n_comp > MP_NUM_COMPONENTS)
return false;
if (!plane->num_components)
return false; // no empty planes in between allowed
bool pad_only = true;
int chroma_luma = 0; // luma: 1, chroma: 2, both: 3
for (int i = 0; i < plane->num_components; i++) {
int comp = plane->components[i];
if (comp > MP_NUM_COMPONENTS)
return false;
if (comp == 0)
continue;
pad_only = false;
if (present[comp - 1])
return false; // no duplicates
present[comp - 1] = true;
chroma_luma |= (comp == 2 || comp == 3) ? 2 : 1;
}
if (pad_only)
return false; // no planes with only padding allowed
if ((fmt->chroma_xs > 0 || fmt->chroma_ys > 0) && chroma_luma == 3)
return false; // separate chroma/luma planes required
}
if (!(present[0] || present[3]) || // at least component 1 or alpha needed
(present[1] && !present[0]) || // component 2 requires component 1
(present[2] && !present[1])) // component 3 requires component 2
return false;
return true;
}
static enum mp_csp get_forced_csp_from_flags(int flags)
{
if (flags & MP_IMGFLAG_COLOR_XYZ)
return MP_CSP_XYZ;
if (flags & MP_IMGFLAG_COLOR_RGB)
return MP_CSP_RGB;
return MP_CSP_AUTO;
}
enum mp_csp mp_imgfmt_get_forced_csp(int imgfmt)
{
return get_forced_csp_from_flags(mp_imgfmt_get_desc(imgfmt).flags);
}
static enum mp_component_type get_component_type_from_flags(int flags)
{
if (flags & MP_IMGFLAG_TYPE_UINT)
return MP_COMPONENT_TYPE_UINT;
if (flags & MP_IMGFLAG_TYPE_FLOAT)
return MP_COMPONENT_TYPE_FLOAT;
return MP_COMPONENT_TYPE_UNKNOWN;
}
enum mp_component_type mp_imgfmt_get_component_type(int imgfmt)
{
return get_component_type_from_flags(mp_imgfmt_get_desc(imgfmt).flags);
}
int mp_find_other_endian(int imgfmt)
{
return pixfmt2imgfmt(av_pix_fmt_swap_endianness(imgfmt2pixfmt(imgfmt)));
}
bool mp_get_regular_imgfmt(struct mp_regular_imgfmt *dst, int imgfmt)
{
struct mp_regular_imgfmt res = {0};
struct mp_imgfmt_desc desc = mp_imgfmt_get_desc(imgfmt);
if (!desc.num_planes)
return false;
res.num_planes = desc.num_planes;
if (desc.endian_shift || !(desc.flags & MP_IMGFLAG_HAS_COMPS))
return false;
res.component_type = get_component_type_from_flags(desc.flags);
if (!res.component_type)
return false;
struct mp_imgfmt_comp_desc *comp0 = &desc.comps[0];
if (comp0->size < 1 || comp0->size > 64 || (comp0->size % 8u))
return false;
res.component_size = comp0->size / 8u;
res.component_pad = comp0->pad;
for (int n = 0; n < res.num_planes; n++) {
if (desc.bpp[n] % comp0->size)
return false;
res.planes[n].num_components = desc.bpp[n] / comp0->size;
}
for (int n = 0; n < MP_NUM_COMPONENTS; n++) {
struct mp_imgfmt_comp_desc *comp = &desc.comps[n];
if (!comp->size)
continue;
struct mp_regular_imgfmt_plane *plane = &res.planes[comp->plane];
res.num_planes = MPMAX(res.num_planes, comp->plane + 1);
// We support uniform depth only.
if (comp->size != comp0->size || comp->pad != comp0->pad)
return false;
// Size-aligned only.
int pos = comp->offset / comp->size;
if (comp->offset != pos * comp->size || pos >= MP_NUM_COMPONENTS)
return false;
if (plane->components[pos])
return false;
plane->components[pos] = n + 1;
}
res.chroma_xs = desc.chroma_xs;
res.chroma_ys = desc.chroma_ys;
res.forced_csp = get_forced_csp_from_flags(desc.flags);
if (!validate_regular_imgfmt(&res))
return false;
*dst = res;
return true;
}
static bool regular_imgfmt_equals(struct mp_regular_imgfmt *a,
struct mp_regular_imgfmt *b)
{
if (a->component_type != b->component_type ||
a->component_size != b->component_size ||
a->num_planes != b->num_planes ||
a->component_pad != b->component_pad ||
a->forced_csp != b->forced_csp ||
a->chroma_xs != b->chroma_xs ||
a->chroma_ys != b->chroma_ys)
return false;
for (int n = 0; n < a->num_planes; n++) {
int num_comps = a->planes[n].num_components;
if (num_comps != b->planes[n].num_components)
return false;
for (int i = 0; i < num_comps; i++) {
if (a->planes[n].components[i] != b->planes[n].components[i])
return false;
}
}
return true;
}
// Find a format that matches this one exactly.
int mp_find_regular_imgfmt(struct mp_regular_imgfmt *src)
{
for (int n = IMGFMT_START + 1; n < IMGFMT_END; n++) {
struct mp_regular_imgfmt f;
if (mp_get_regular_imgfmt(&f, n) && regular_imgfmt_equals(src, &f))
return n;
}
return 0;
}
// Compare the dst image formats, and return the one which can carry more data
// (e.g. higher depth, more color components, lower chroma subsampling, etc.),
// with respect to what is required to keep most of the src format.
// Returns the imgfmt, or 0 on error.
int mp_imgfmt_select_best(int dst1, int dst2, int src)
{
enum AVPixelFormat dst1pxf = imgfmt2pixfmt(dst1);
enum AVPixelFormat dst2pxf = imgfmt2pixfmt(dst2);
enum AVPixelFormat srcpxf = imgfmt2pixfmt(src);
enum AVPixelFormat dstlist[] = {dst1pxf, dst2pxf, AV_PIX_FMT_NONE};
return pixfmt2imgfmt(avcodec_find_best_pix_fmt_of_list(dstlist, srcpxf, 1, 0));
}
// Same as mp_imgfmt_select_best(), but with a list of dst formats.
int mp_imgfmt_select_best_list(int *dst, int num_dst, int src)
{
int best = 0;
for (int n = 0; n < num_dst; n++)
best = best ? mp_imgfmt_select_best(best, dst[n], src) : dst[n];
return best;
}
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