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proresenc: alpha coding support

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This commit is contained in:
Kostya Shishkov 2013-05-18 12:07:30 +02:00
parent 86113667c0
commit 0b0953baec
2 changed files with 226 additions and 21 deletions
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6
doc/encoders.texi
View File

@ -608,6 +608,7 @@ Select the ProRes profile to encode
@item lt
@item standard
@item hq
@item 4444
@end table
@item quant_mat @var{integer}
@ -637,6 +638,11 @@ Override the 4-byte vendor ID.
A custom vendor ID like @var{apl0} would claim the stream was produced by
the Apple encoder.
@item alpha_bits @var{integer}
Specify number of bits for alpha component.
Possible values are @var{0}, @var{8} and @var{16}.
Use @var{0} to disable alpha plane coding.
@end table
@subsection Speed considerations

241
libavcodec/proresenc.c
View File

@ -21,6 +21,7 @@
*/
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "dsputil.h"
#include "put_bits.h"
@ -34,13 +35,14 @@
#define MAX_MBS_PER_SLICE 8
#define MAX_PLANES 3 // should be increased to 4 when there's AV_PIX_FMT_YUV444AP10
#define MAX_PLANES 4
enum {
PRORES_PROFILE_PROXY = 0,
PRORES_PROFILE_LT,
PRORES_PROFILE_STANDARD,
PRORES_PROFILE_HQ,
PRORES_PROFILE_4444,
};
enum {
@ -119,7 +121,7 @@ static const struct prores_profile {
int max_quant;
int br_tab[NUM_MB_LIMITS];
int quant;
} prores_profile_info[4] = {
} prores_profile_info[5] = {
{
.full_name = "proxy",
.tag = MKTAG('a', 'p', 'c', 'o'),
@ -151,8 +153,15 @@ static const struct prores_profile {
.max_quant = 6,
.br_tab = { 1566, 1216, 1070, 950 },
.quant = QUANT_MAT_HQ,
},
{
.full_name = "4444",
.tag = MKTAG('a', 'p', '4', 'h'),
.min_quant = 1,
.max_quant = 6,
.br_tab = { 2350, 1828, 1600, 1425 },
.quant = QUANT_MAT_HQ,
}
// for 4444 profile bitrate numbers are { 2350, 1828, 1600, 1425 }
};
#define TRELLIS_WIDTH 16
@ -195,6 +204,7 @@ typedef struct ProresContext {
int num_planes;
int bits_per_mb;
int force_quant;
int alpha_bits;
char *vendor;
int quant_sel;
@ -280,6 +290,34 @@ static void get_slice_data(ProresContext *ctx, const uint16_t *src,
}
}
static void get_alpha_data(ProresContext *ctx, const uint16_t *src,
int linesize, int x, int y, int w, int h,
int16_t *blocks, int mbs_per_slice, int abits)
{
const int slice_width = 16 * mbs_per_slice;
int i, j, copy_w, copy_h;
copy_w = FFMIN(w - x, slice_width);
copy_h = FFMIN(h - y, 16);
for (i = 0; i < copy_h; i++) {
memcpy(blocks, src, copy_w * sizeof(*src));
if (abits == 8)
for (j = 0; j < copy_w; j++)
blocks[j] >>= 2;
else
for (j = 0; j < copy_w; j++)
blocks[j] = (blocks[j] << 6) | (blocks[j] >> 4);
for (j = copy_w; j < slice_width; j++)
blocks[j] = blocks[copy_w - 1];
blocks += slice_width;
src += linesize >> 1;
}
for (; i < 16; i++) {
memcpy(blocks, blocks - slice_width, slice_width * sizeof(*blocks));
blocks += slice_width;
}
}
/**
* Write an unsigned rice/exp golomb codeword.
*/
@ -394,6 +432,73 @@ static int encode_slice_plane(ProresContext *ctx, PutBitContext *pb,
return (put_bits_count(pb) - saved_pos) >> 3;
}
static void put_alpha_diff(PutBitContext *pb, int cur, int prev, int abits)
{
const int mask = (1 << abits) - 1;
const int dbits = (abits == 8) ? 4 : 7;
const int dsize = 1 << dbits - 1;
int diff = cur - prev;
diff &= mask;
if (diff >= (1 << abits) - dsize)
diff -= 1 << abits;
if (diff < -dsize || diff > dsize || !diff) {
put_bits(pb, 1, 1);
put_bits(pb, abits, diff);
} else {
put_bits(pb, 1, 0);
put_bits(pb, dbits - 1, FFABS(diff) - 1);
put_bits(pb, 1, diff < 0);
}
}
static void put_alpha_run(PutBitContext *pb, int run)
{
if (run) {
put_bits(pb, 1, 0);
if (run < 0x10)
put_bits(pb, 4, run);
else
put_bits(pb, 15, run);
} else {
put_bits(pb, 1, 1);
}
}
// todo alpha quantisation for high quants
static int encode_alpha_plane(ProresContext *ctx, PutBitContext *pb,
const uint16_t *src, int linesize,
int mbs_per_slice, uint16_t *blocks,
int quant)
{
const int abits = ctx->alpha_bits;
const int mask = (1 << abits) - 1;
const int num_coeffs = mbs_per_slice * 256;
int saved_pos = put_bits_count(pb);
int prev = mask, cur;
int idx = 0;
int run = 0;
cur = blocks[idx++];
put_alpha_diff(pb, cur, prev, abits);
prev = cur;
do {
cur = blocks[idx++];
if (cur != prev) {
put_alpha_run (pb, run);
put_alpha_diff(pb, cur, prev, abits);
prev = cur;
run = 0;
} else {
run++;
}
} while (idx < num_coeffs);
if (run)
put_alpha_run(pb, run);
flush_put_bits(pb);
return (put_bits_count(pb) - saved_pos) >> 3;
}
static int encode_slice(AVCodecContext *avctx, const AVFrame *pic,
PutBitContext *pb,
int sizes[4], int x, int y, int quant,
@ -444,14 +549,23 @@ static int encode_slice(AVCodecContext *avctx, const AVFrame *pic,
src = (const uint16_t*)(pic->data[i] + yp * linesize +
line_add * pic->linesize[i]) + xp;
get_slice_data(ctx, src, linesize, xp, yp,
pwidth, avctx->height / ctx->pictures_per_frame,
ctx->blocks[0], ctx->emu_buf,
mbs_per_slice, num_cblocks, is_chroma);
sizes[i] = encode_slice_plane(ctx, pb, src, linesize,
mbs_per_slice, ctx->blocks[0],
num_cblocks, plane_factor,
qmat);
if (i < 3) {
get_slice_data(ctx, src, linesize, xp, yp,
pwidth, avctx->height / ctx->pictures_per_frame,
ctx->blocks[0], ctx->emu_buf,
mbs_per_slice, num_cblocks, is_chroma);
sizes[i] = encode_slice_plane(ctx, pb, src, linesize,
mbs_per_slice, ctx->blocks[0],
num_cblocks, plane_factor,
qmat);
} else {
get_alpha_data(ctx, src, linesize, xp, yp,
pwidth, avctx->height / ctx->pictures_per_frame,
ctx->blocks[0], mbs_per_slice, ctx->alpha_bits);
sizes[i] = encode_alpha_plane(ctx, pb, src, linesize,
mbs_per_slice, ctx->blocks[0],
quant);
}
total_size += sizes[i];
}
return total_size;
@ -564,6 +678,66 @@ static int estimate_slice_plane(ProresContext *ctx, int *error, int plane,
return FFALIGN(bits, 8);
}
static int est_alpha_diff(int cur, int prev, int abits)
{
const int mask = (1 << abits) - 1;
const int dbits = (abits == 8) ? 4 : 7;
const int dsize = 1 << dbits - 1;
int diff = cur - prev;
diff &= mask;
if (diff >= (1 << abits) - dsize)
diff -= 1 << abits;
if (diff < -dsize || diff > dsize || !diff)
return abits + 1;
else
return dbits + 1;
}
static int estimate_alpha_plane(ProresContext *ctx, int *error,
const uint16_t *src, int linesize,
int mbs_per_slice, int quant,
int16_t *blocks)
{
const int abits = ctx->alpha_bits;
const int mask = (1 << abits) - 1;
const int num_coeffs = mbs_per_slice * 256;
int prev = mask, cur;
int idx = 0;
int run = 0;
int bits;
*error = 0;
cur = blocks[idx++];
bits = est_alpha_diff(cur, prev, abits);
prev = cur;
do {
cur = blocks[idx++];
if (cur != prev) {
if (!run)
bits++;
else if (run < 0x10)
bits += 4;
else
bits += 15;
bits += est_alpha_diff(cur, prev, abits);
prev = cur;
run = 0;
} else {
run++;
}
} while (idx < num_coeffs);
if (run) {
if (run < 0x10)
bits += 4;
else
bits += 15;
}
return bits;
}
static int find_slice_quant(AVCodecContext *avctx, const AVFrame *pic,
int trellis_node, int x, int y, int mbs_per_slice,
ProresThreadData *td)
@ -610,10 +784,16 @@ static int find_slice_quant(AVCodecContext *avctx, const AVFrame *pic,
src = (const uint16_t*)(pic->data[i] + yp * linesize[i] +
line_add * pic->linesize[i]) + xp;
get_slice_data(ctx, src, linesize[i], xp, yp,
pwidth, avctx->height / ctx->pictures_per_frame,
td->blocks[i], td->emu_buf,
mbs_per_slice, num_cblocks[i], is_chroma[i]);
if (i < 3) {
get_slice_data(ctx, src, linesize[i], xp, yp,
pwidth, avctx->height / ctx->pictures_per_frame,
td->blocks[i], td->emu_buf,
mbs_per_slice, num_cblocks[i], is_chroma[i]);
} else {
get_alpha_data(ctx, src, linesize[i], xp, yp,
pwidth, avctx->height / ctx->pictures_per_frame,
td->blocks[i], mbs_per_slice, ctx->alpha_bits);
}
}
for (q = min_quant; q < max_quant + 2; q++) {
@ -625,13 +805,16 @@ static int find_slice_quant(AVCodecContext *avctx, const AVFrame *pic,
for (q = min_quant; q <= max_quant; q++) {
bits = 0;
error = 0;
for (i = 0; i < ctx->num_planes; i++) {
for (i = 0; i < ctx->num_planes - !!ctx->alpha_bits; i++) {
bits += estimate_slice_plane(ctx, &error, i,
src, linesize[i],
mbs_per_slice,
num_cblocks[i], plane_factor[i],
ctx->quants[q], td);
}
if (ctx->alpha_bits)
bits += estimate_alpha_plane(ctx, &error, src, linesize[3],
mbs_per_slice, q, td->blocks[3]);
if (bits > 65000 * 8) {
error = SCORE_LIMIT;
break;
@ -654,13 +837,16 @@ static int find_slice_quant(AVCodecContext *avctx, const AVFrame *pic,
for (i = 0; i < 64; i++)
qmat[i] = ctx->quant_mat[i] * q;
}
for (i = 0; i < ctx->num_planes; i++) {
for (i = 0; i < ctx->num_planes - !!ctx->alpha_bits; i++) {
bits += estimate_slice_plane(ctx, &error, i,
src, linesize[i],
mbs_per_slice,
num_cblocks[i], plane_factor[i],
qmat, td);
}
if (ctx->alpha_bits)
bits += estimate_alpha_plane(ctx, &error, src, linesize[3],
mbs_per_slice, q, td->blocks[3]);
if (bits <= ctx->bits_per_mb * mbs_per_slice)
break;
}
@ -782,7 +968,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
bytestream_put_byte (&buf, avctx->color_primaries);
bytestream_put_byte (&buf, avctx->color_trc);
bytestream_put_byte (&buf, avctx->colorspace);
bytestream_put_byte (&buf, 0x40); // source format and alpha information
bytestream_put_byte (&buf, 0x40 | (ctx->alpha_bits >> 3));
bytestream_put_byte (&buf, 0); // reserved
if (ctx->quant_sel != QUANT_MAT_DEFAULT) {
bytestream_put_byte (&buf, 0x03); // matrix flags - both matrices are present
@ -904,12 +1090,20 @@ static av_cold int encode_init(AVCodecContext *avctx)
"there should be an integer power of two MBs per slice\n");
return AVERROR(EINVAL);
}
if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_ALPHA) {
if (ctx->alpha_bits & 7) {
av_log(avctx, AV_LOG_ERROR, "alpha bits should be 0, 8 or 16\n");
return AVERROR(EINVAL);
}
} else {
ctx->alpha_bits = 0;
}
ctx->chroma_factor = avctx->pix_fmt == AV_PIX_FMT_YUV422P10
? CFACTOR_Y422
: CFACTOR_Y444;
ctx->profile_info = prores_profile_info + ctx->profile;
ctx->num_planes = 3;
ctx->num_planes = 3 + !!ctx->alpha_bits;
ctx->mb_width = FFALIGN(avctx->width, 16) >> 4;
@ -1025,7 +1219,7 @@ static const AVOption options[] = {
AV_OPT_TYPE_INT, { .i64 = 8 }, 1, MAX_MBS_PER_SLICE, VE },
{ "profile", NULL, OFFSET(profile), AV_OPT_TYPE_INT,
{ .i64 = PRORES_PROFILE_STANDARD },
PRORES_PROFILE_PROXY, PRORES_PROFILE_HQ, VE, "profile" },
PRORES_PROFILE_PROXY, PRORES_PROFILE_4444, VE, "profile" },
{ "proxy", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PRORES_PROFILE_PROXY },
0, 0, VE, "profile" },
{ "lt", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PRORES_PROFILE_LT },
@ -1034,6 +1228,8 @@ static const AVOption options[] = {
0, 0, VE, "profile" },
{ "hq", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PRORES_PROFILE_HQ },
0, 0, VE, "profile" },
{ "4444", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PRORES_PROFILE_4444 },
0, 0, VE, "profile" },
{ "vendor", "vendor ID", OFFSET(vendor),
AV_OPT_TYPE_STRING, { .str = "Lavc" }, CHAR_MIN, CHAR_MAX, VE },
{ "bits_per_mb", "desired bits per macroblock", OFFSET(bits_per_mb),
@ -1052,6 +1248,8 @@ static const AVOption options[] = {
0, 0, VE, "quant_mat" },
{ "default", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = QUANT_MAT_DEFAULT },
0, 0, VE, "quant_mat" },
{ "alpha_bits", "bits for alpha plane", OFFSET(alpha_bits), AV_OPT_TYPE_INT,
{ .i64 = 16 }, 0, 16, VE },
{ NULL }
};
@ -1073,7 +1271,8 @@ AVCodec ff_prores_encoder = {
.capabilities = CODEC_CAP_SLICE_THREADS,
.long_name = NULL_IF_CONFIG_SMALL("Apple ProRes (iCodec Pro)"),
.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_NONE
AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_NONE
},
.priv_class = &proresenc_class,
};