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FFmpeg/libavcodec/speedhqdec.c
Andreas Rheinhardt fd4cb6ebee avcodec/speedhqdec: Avoid unnecessary VLC structure 
Everything besides VLC.table is basically write-only
and even VLC.table can be removed by accessing the
underlying table directly.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2023-10-31 20:47:00 +01:00

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/*
* NewTek SpeedHQ codec
* Copyright 2017 Steinar H. Gunderson
*
* 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
*/
/**
* @file
* NewTek SpeedHQ decoder.
*/
#define BITSTREAM_READER_LE
#include "libavutil/attributes.h"
#include "libavutil/mem_internal.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "libavutil/thread.h"
#include "mathops.h"
#include "mpeg12data.h"
#include "mpeg12vlc.h"
#include "speedhq.h"
#define MAX_INDEX (64 - 1)
/*
* 5 bits makes for very small tables, with no more than two lookups needed
* for the longest (10-bit) codes.
*/
#define ALPHA_VLC_BITS 5
typedef struct SHQContext {
BlockDSPContext bdsp;
IDCTDSPContext idsp;
uint8_t permutated_intra_scantable[64];
int quant_matrix[64];
enum { SHQ_SUBSAMPLING_420, SHQ_SUBSAMPLING_422, SHQ_SUBSAMPLING_444 }
subsampling;
enum { SHQ_NO_ALPHA, SHQ_RLE_ALPHA, SHQ_DCT_ALPHA } alpha_type;
} SHQContext;
/* NOTE: The first element is always 16, unscaled. */
static const uint8_t unscaled_quant_matrix[64] = {
16, 16, 19, 22, 26, 27, 29, 34,
16, 16, 22, 24, 27, 29, 34, 37,
19, 22, 26, 27, 29, 34, 34, 38,
22, 22, 26, 27, 29, 34, 37, 40,
22, 26, 27, 29, 32, 35, 40, 48,
26, 27, 29, 32, 35, 40, 48, 58,
26, 27, 29, 34, 38, 46, 56, 69,
27, 29, 35, 38, 46, 56, 69, 83
};
static VLCElem dc_lum_vlc_le[512];
static VLCElem dc_chroma_vlc_le[514];
static VLCElem dc_alpha_run_vlc_le[160];
static VLCElem dc_alpha_level_vlc_le[288];
static RL_VLC_ELEM speedhq_rl_vlc[674];
static inline int decode_dc_le(GetBitContext *gb, int component)
{
int code, diff;
if (component == 0 || component == 3) {
code = get_vlc2(gb, dc_lum_vlc_le, DC_VLC_BITS, 2);
} else {
code = get_vlc2(gb, dc_chroma_vlc_le, DC_VLC_BITS, 2);
}
if (!code) {
diff = 0;
} else {
diff = get_xbits_le(gb, code);
}
return diff;
}
static inline int decode_alpha_block(const SHQContext *s, GetBitContext *gb, uint8_t last_alpha[16], uint8_t *dest, int linesize)
{
uint8_t block[128];
int i = 0, x, y;
memset(block, 0, sizeof(block));
{
OPEN_READER(re, gb);
for ( ;; ) {
int run, level;
UPDATE_CACHE_LE(re, gb);
GET_VLC(run, re, gb, dc_alpha_run_vlc_le, ALPHA_VLC_BITS, 2);
if (run < 0) break;
i += run;
if (i >= 128)
return AVERROR_INVALIDDATA;
UPDATE_CACHE_LE(re, gb);
GET_VLC(level, re, gb, dc_alpha_level_vlc_le, ALPHA_VLC_BITS, 2);
block[i++] = level;
}
CLOSE_READER(re, gb);
}
for (y = 0; y < 8; y++) {
for (x = 0; x < 16; x++) {
last_alpha[x] -= block[y * 16 + x];
}
memcpy(dest, last_alpha, 16);
dest += linesize;
}
return 0;
}
static inline int decode_dct_block(const SHQContext *s, GetBitContext *gb, int last_dc[4], int component, uint8_t *dest, int linesize)
{
const int *quant_matrix = s->quant_matrix;
const uint8_t *scantable = s->permutated_intra_scantable;
LOCAL_ALIGNED_32(int16_t, block, [64]);
int dc_offset;
s->bdsp.clear_block(block);
dc_offset = decode_dc_le(gb, component);
last_dc[component] -= dc_offset; /* Note: Opposite of most codecs. */
block[scantable[0]] = last_dc[component]; /* quant_matrix[0] is always 16. */
/* Read AC coefficients. */
{
int i = 0;
OPEN_READER(re, gb);
for ( ;; ) {
int level, run;
UPDATE_CACHE_LE(re, gb);
GET_RL_VLC(level, run, re, gb, speedhq_rl_vlc,
TEX_VLC_BITS, 2, 0);
if (level == 127) {
break;
} else if (level) {
i += run;
if (i > MAX_INDEX)
return AVERROR_INVALIDDATA;
/* If next bit is 1, level = -level */
level = (level ^ SHOW_SBITS(re, gb, 1)) -
SHOW_SBITS(re, gb, 1);
LAST_SKIP_BITS(re, gb, 1);
} else {
/* Escape. */
#if MIN_CACHE_BITS < 6 + 6 + 12
#error MIN_CACHE_BITS is too small for the escape code, add UPDATE_CACHE
#endif
run = SHOW_UBITS(re, gb, 6) + 1;
SKIP_BITS(re, gb, 6);
level = SHOW_UBITS(re, gb, 12) - 2048;
LAST_SKIP_BITS(re, gb, 12);
i += run;
if (i > MAX_INDEX)
return AVERROR_INVALIDDATA;
}
block[scantable[i]] = (level * quant_matrix[i]) >> 4;
}
CLOSE_READER(re, gb);
}
s->idsp.idct_put(dest, linesize, block);
return 0;
}
static int decode_speedhq_border(const SHQContext *s, GetBitContext *gb, AVFrame *frame, int field_number, int line_stride)
{
int linesize_y = frame->linesize[0] * line_stride;
int linesize_cb = frame->linesize[1] * line_stride;
int linesize_cr = frame->linesize[2] * line_stride;
int linesize_a;
int ret;
if (s->alpha_type != SHQ_NO_ALPHA)
linesize_a = frame->linesize[3] * line_stride;
for (int y = 0; y < frame->height; y += 16 * line_stride) {
int last_dc[4] = { 1024, 1024, 1024, 1024 };
uint8_t *dest_y, *dest_cb, *dest_cr, *dest_a;
uint8_t last_alpha[16];
int x = frame->width - 8;
dest_y = frame->data[0] + frame->linesize[0] * (y + field_number) + x;
if (s->subsampling == SHQ_SUBSAMPLING_420) {
dest_cb = frame->data[1] + frame->linesize[1] * (y/2 + field_number) + x / 2;
dest_cr = frame->data[2] + frame->linesize[2] * (y/2 + field_number) + x / 2;
} else {
av_assert2(s->subsampling == SHQ_SUBSAMPLING_422);
dest_cb = frame->data[1] + frame->linesize[1] * (y + field_number) + x / 2;
dest_cr = frame->data[2] + frame->linesize[2] * (y + field_number) + x / 2;
}
if (s->alpha_type != SHQ_NO_ALPHA) {
memset(last_alpha, 255, sizeof(last_alpha));
dest_a = frame->data[3] + frame->linesize[3] * (y + field_number) + x;
}
if ((ret = decode_dct_block(s, gb, last_dc, 0, dest_y, linesize_y)) < 0)
return ret;
if ((ret = decode_dct_block(s, gb, last_dc, 0, dest_y + 8, linesize_y)) < 0)
return ret;
if ((ret = decode_dct_block(s, gb, last_dc, 0, dest_y + 8 * linesize_y, linesize_y)) < 0)
return ret;
if ((ret = decode_dct_block(s, gb, last_dc, 0, dest_y + 8 * linesize_y + 8, linesize_y)) < 0)
return ret;
if ((ret = decode_dct_block(s, gb, last_dc, 1, dest_cb, linesize_cb)) < 0)
return ret;
if ((ret = decode_dct_block(s, gb, last_dc, 2, dest_cr, linesize_cr)) < 0)
return ret;
if (s->subsampling != SHQ_SUBSAMPLING_420) {
if ((ret = decode_dct_block(s, gb, last_dc, 1, dest_cb + 8 * linesize_cb, linesize_cb)) < 0)
return ret;
if ((ret = decode_dct_block(s, gb, last_dc, 2, dest_cr + 8 * linesize_cr, linesize_cr)) < 0)
return ret;
}
if (s->alpha_type == SHQ_RLE_ALPHA) {
/* Alpha coded using 16x8 RLE blocks. */
if ((ret = decode_alpha_block(s, gb, last_alpha, dest_a, linesize_a)) < 0)
return ret;
if ((ret = decode_alpha_block(s, gb, last_alpha, dest_a + 8 * linesize_a, linesize_a)) < 0)
return ret;
} else if (s->alpha_type == SHQ_DCT_ALPHA) {
/* Alpha encoded exactly like luma. */
if ((ret = decode_dct_block(s, gb, last_dc, 3, dest_a, linesize_a)) < 0)
return ret;
if ((ret = decode_dct_block(s, gb, last_dc, 3, dest_a + 8, linesize_a)) < 0)
return ret;
if ((ret = decode_dct_block(s, gb, last_dc, 3, dest_a + 8 * linesize_a, linesize_a)) < 0)
return ret;
if ((ret = decode_dct_block(s, gb, last_dc, 3, dest_a + 8 * linesize_a + 8, linesize_a)) < 0)
return ret;
}
}
return 0;
}
static int decode_speedhq_field(const SHQContext *s, const uint8_t *buf, int buf_size, AVFrame *frame, int field_number, int start, int end, int line_stride)
{
int ret, slice_number, slice_offsets[5];
int linesize_y = frame->linesize[0] * line_stride;
int linesize_cb = frame->linesize[1] * line_stride;
int linesize_cr = frame->linesize[2] * line_stride;
int linesize_a;
GetBitContext gb;
if (s->alpha_type != SHQ_NO_ALPHA)
linesize_a = frame->linesize[3] * line_stride;
if (end < start || end - start < 3 || end > buf_size)
return AVERROR_INVALIDDATA;
slice_offsets[0] = start;
slice_offsets[4] = end;
for (slice_number = 1; slice_number < 4; slice_number++) {
uint32_t last_offset, slice_len;
last_offset = slice_offsets[slice_number - 1];
slice_len = AV_RL24(buf + last_offset);
slice_offsets[slice_number] = last_offset + slice_len;
if (slice_len < 3 || slice_offsets[slice_number] > end - 3)
return AVERROR_INVALIDDATA;
}
for (slice_number = 0; slice_number < 4; slice_number++) {
uint32_t slice_begin, slice_end;
int x, y;
slice_begin = slice_offsets[slice_number];
slice_end = slice_offsets[slice_number + 1];
if ((ret = init_get_bits8(&gb, buf + slice_begin + 3, slice_end - slice_begin - 3)) < 0)
return ret;
for (y = slice_number * 16 * line_stride; y < frame->height; y += line_stride * 64) {
uint8_t *dest_y, *dest_cb, *dest_cr, *dest_a;
int last_dc[4] = { 1024, 1024, 1024, 1024 };
uint8_t last_alpha[16];
memset(last_alpha, 255, sizeof(last_alpha));
dest_y = frame->data[0] + frame->linesize[0] * (y + field_number);
if (s->subsampling == SHQ_SUBSAMPLING_420) {
dest_cb = frame->data[1] + frame->linesize[1] * (y/2 + field_number);
dest_cr = frame->data[2] + frame->linesize[2] * (y/2 + field_number);
} else {
dest_cb = frame->data[1] + frame->linesize[1] * (y + field_number);
dest_cr = frame->data[2] + frame->linesize[2] * (y + field_number);
}
if (s->alpha_type != SHQ_NO_ALPHA) {
dest_a = frame->data[3] + frame->linesize[3] * (y + field_number);
}
for (x = 0; x < frame->width - 8 * (s->subsampling != SHQ_SUBSAMPLING_444); x += 16) {
/* Decode the four luma blocks. */
if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y, linesize_y)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y + 8, linesize_y)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y + 8 * linesize_y, linesize_y)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 0, dest_y + 8 * linesize_y + 8, linesize_y)) < 0)
return ret;
/*
* Decode the first chroma block. For 4:2:0, this is the only one;
* for 4:2:2, it's the top block; for 4:4:4, it's the top-left block.
*/
if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb, linesize_cb)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr, linesize_cr)) < 0)
return ret;
if (s->subsampling != SHQ_SUBSAMPLING_420) {
/* For 4:2:2, this is the bottom block; for 4:4:4, it's the bottom-left block. */
if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb + 8 * linesize_cb, linesize_cb)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr + 8 * linesize_cr, linesize_cr)) < 0)
return ret;
if (s->subsampling == SHQ_SUBSAMPLING_444) {
/* Top-right and bottom-right blocks. */
if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb + 8, linesize_cb)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr + 8, linesize_cr)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 1, dest_cb + 8 * linesize_cb + 8, linesize_cb)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 2, dest_cr + 8 * linesize_cr + 8, linesize_cr)) < 0)
return ret;
dest_cb += 8;
dest_cr += 8;
}
}
dest_y += 16;
dest_cb += 8;
dest_cr += 8;
if (s->alpha_type == SHQ_RLE_ALPHA) {
/* Alpha coded using 16x8 RLE blocks. */
if ((ret = decode_alpha_block(s, &gb, last_alpha, dest_a, linesize_a)) < 0)
return ret;
if ((ret = decode_alpha_block(s, &gb, last_alpha, dest_a + 8 * linesize_a, linesize_a)) < 0)
return ret;
dest_a += 16;
} else if (s->alpha_type == SHQ_DCT_ALPHA) {
/* Alpha encoded exactly like luma. */
if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a, linesize_a)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a + 8, linesize_a)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a + 8 * linesize_a, linesize_a)) < 0)
return ret;
if ((ret = decode_dct_block(s, &gb, last_dc, 3, dest_a + 8 * linesize_a + 8, linesize_a)) < 0)
return ret;
dest_a += 16;
}
}
}
}
if (s->subsampling != SHQ_SUBSAMPLING_444 && (frame->width & 15))
return decode_speedhq_border(s, &gb, frame, field_number, line_stride);
return 0;
}
static void compute_quant_matrix(int *output, int qscale)
{
int i;
for (i = 0; i < 64; i++) output[i] = unscaled_quant_matrix[ff_zigzag_direct[i]] * qscale;
}
static int speedhq_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
SHQContext * const s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
uint8_t quality;
uint32_t second_field_offset;
int ret;
if (buf_size < 4 || avctx->width < 8 || avctx->width % 8 != 0)
return AVERROR_INVALIDDATA;
if (buf_size < avctx->width*avctx->height / 64 / 4)
return AVERROR_INVALIDDATA;
quality = buf[0];
if (quality >= 100) {
return AVERROR_INVALIDDATA;
}
compute_quant_matrix(s->quant_matrix, 100 - quality);
second_field_offset = AV_RL24(buf + 1);
if (second_field_offset >= buf_size - 3) {
return AVERROR_INVALIDDATA;
}
avctx->coded_width = FFALIGN(avctx->width, 16);
avctx->coded_height = FFALIGN(avctx->height, 16);
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
return ret;
}
frame->flags |= AV_FRAME_FLAG_KEY;
if (second_field_offset == 4 || second_field_offset == (buf_size-4)) {
/*
* Overlapping first and second fields is used to signal
* encoding only a single field. In this case, "height"
* is ambiguous; it could mean either the height of the
* frame as a whole, or of the field. The former would make
* more sense for compatibility with legacy decoders,
* but this matches the convention used in NDI, which is
* the primary user of this trick.
*/
if ((ret = decode_speedhq_field(s, buf, buf_size, frame, 0, 4, buf_size, 1)) < 0)
return ret;
} else {
if ((ret = decode_speedhq_field(s, buf, buf_size, frame, 0, 4, second_field_offset, 2)) < 0)
return ret;
if ((ret = decode_speedhq_field(s, buf, buf_size, frame, 1, second_field_offset, buf_size, 2)) < 0)
return ret;
}
*got_frame = 1;
return buf_size;
}
/*
* Alpha VLC. Run and level are independently coded, and would be
* outside the default limits for MAX_RUN/MAX_LEVEL, so we don't
* bother with combining them into one table.
*/
static av_cold void compute_alpha_vlcs(void)
{
uint16_t run_code[134], level_code[266];
uint8_t run_bits[134], level_bits[266];
int16_t run_symbols[134], level_symbols[266];
int entry, i, sign;
/* Initialize VLC for alpha run. */
entry = 0;
/* 0 -> 0. */
run_code[entry] = 0;
run_bits[entry] = 1;
run_symbols[entry] = 0;
++entry;
/* 10xx -> xx plus 1. */
for (i = 0; i < 4; ++i) {
run_code[entry] = (i << 2) | 1;
run_bits[entry] = 4;
run_symbols[entry] = i + 1;
++entry;
}
/* 111xxxxxxx -> xxxxxxx. */
for (i = 0; i < 128; ++i) {
run_code[entry] = (i << 3) | 7;
run_bits[entry] = 10;
run_symbols[entry] = i;
++entry;
}
/* 110 -> EOB. */
run_code[entry] = 3;
run_bits[entry] = 3;
run_symbols[entry] = -1;
++entry;
av_assert0(entry == FF_ARRAY_ELEMS(run_code));
VLC_INIT_STATIC_SPARSE_TABLE(dc_alpha_run_vlc_le, ALPHA_VLC_BITS,
FF_ARRAY_ELEMS(run_code),
run_bits, 1, 1,
run_code, 2, 2,
run_symbols, 2, 2, VLC_INIT_LE);
/* Initialize VLC for alpha level. */
entry = 0;
for (sign = 0; sign <= 1; ++sign) {
/* 1s -> -1 or +1 (depending on sign bit). */
level_code[entry] = (sign << 1) | 1;
level_bits[entry] = 2;
level_symbols[entry] = sign ? -1 : 1;
++entry;
/* 01sxx -> xx plus 2 (2..5 or -2..-5, depending on sign bit). */
for (i = 0; i < 4; ++i) {
level_code[entry] = (i << 3) | (sign << 2) | 2;
level_bits[entry] = 5;
level_symbols[entry] = sign ? -(i + 2) : (i + 2);
++entry;
}
}
/*
* 00xxxxxxxx -> xxxxxxxx, in two's complement. There are many codes
* here that would better be encoded in other ways (e.g. 0 would be
* encoded by increasing run, and +/- 1 would be encoded with a
* shorter code), but it doesn't hurt to allow everything.
*/
for (i = 0; i < 256; ++i) {
level_code[entry] = i << 2;
level_bits[entry] = 10;
level_symbols[entry] = i;
++entry;
}
av_assert0(entry == FF_ARRAY_ELEMS(level_code));
VLC_INIT_STATIC_SPARSE_TABLE(dc_alpha_level_vlc_le, ALPHA_VLC_BITS,
FF_ARRAY_ELEMS(level_code),
level_bits, 1, 1,
level_code, 2, 2,
level_symbols, 2, 2, VLC_INIT_LE);
}
static av_cold void speedhq_static_init(void)
{
/* Exactly the same as MPEG-2, except for a little-endian reader. */
VLC_INIT_STATIC_TABLE(dc_lum_vlc_le, DC_VLC_BITS, 12,
ff_mpeg12_vlc_dc_lum_bits, 1, 1,
ff_mpeg12_vlc_dc_lum_code, 2, 2,
VLC_INIT_OUTPUT_LE);
VLC_INIT_STATIC_TABLE(dc_chroma_vlc_le, DC_VLC_BITS, 12,
ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
ff_mpeg12_vlc_dc_chroma_code, 2, 2,
VLC_INIT_OUTPUT_LE);
ff_init_2d_vlc_rl(ff_speedhq_vlc_table, speedhq_rl_vlc, ff_speedhq_run,
ff_speedhq_level, SPEEDHQ_RL_NB_ELEMS,
FF_ARRAY_ELEMS(speedhq_rl_vlc), VLC_INIT_LE);
compute_alpha_vlcs();
}
static av_cold int speedhq_decode_init(AVCodecContext *avctx)
{
int ret;
static AVOnce init_once = AV_ONCE_INIT;
SHQContext * const s = avctx->priv_data;
ret = ff_thread_once(&init_once, speedhq_static_init);
if (ret)
return AVERROR_UNKNOWN;
ff_blockdsp_init(&s->bdsp);
ff_idctdsp_init(&s->idsp, avctx);
ff_permute_scantable(s->permutated_intra_scantable, ff_zigzag_direct,
s->idsp.idct_permutation);
switch (avctx->codec_tag) {
case MKTAG('S', 'H', 'Q', '0'):
s->subsampling = SHQ_SUBSAMPLING_420;
s->alpha_type = SHQ_NO_ALPHA;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
break;
case MKTAG('S', 'H', 'Q', '1'):
s->subsampling = SHQ_SUBSAMPLING_420;
s->alpha_type = SHQ_RLE_ALPHA;
avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
break;
case MKTAG('S', 'H', 'Q', '2'):
s->subsampling = SHQ_SUBSAMPLING_422;
s->alpha_type = SHQ_NO_ALPHA;
avctx->pix_fmt = AV_PIX_FMT_YUV422P;
break;
case MKTAG('S', 'H', 'Q', '3'):
s->subsampling = SHQ_SUBSAMPLING_422;
s->alpha_type = SHQ_RLE_ALPHA;
avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
break;
case MKTAG('S', 'H', 'Q', '4'):
s->subsampling = SHQ_SUBSAMPLING_444;
s->alpha_type = SHQ_NO_ALPHA;
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
break;
case MKTAG('S', 'H', 'Q', '5'):
s->subsampling = SHQ_SUBSAMPLING_444;
s->alpha_type = SHQ_RLE_ALPHA;
avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
break;
case MKTAG('S', 'H', 'Q', '7'):
s->subsampling = SHQ_SUBSAMPLING_422;
s->alpha_type = SHQ_DCT_ALPHA;
avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
break;
case MKTAG('S', 'H', 'Q', '9'):
s->subsampling = SHQ_SUBSAMPLING_444;
s->alpha_type = SHQ_DCT_ALPHA;
avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown NewTek SpeedHQ FOURCC provided (%08X)\n",
avctx->codec_tag);
return AVERROR_INVALIDDATA;
}
/* This matches what NDI's RGB -> Y'CbCr 4:2:2 converter uses. */
avctx->colorspace = AVCOL_SPC_BT470BG;
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
return 0;
}
const FFCodec ff_speedhq_decoder = {
.p.name = "speedhq",
CODEC_LONG_NAME("NewTek SpeedHQ"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_SPEEDHQ,
.priv_data_size = sizeof(SHQContext),
.init = speedhq_decode_init,
FF_CODEC_DECODE_CB(speedhq_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
};
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