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FFmpeg/libavcodec/notchlc.c
Paul B Mahol 1c3a3a4ec6 avcodec/notchlc: add initial alpha support
2020-08-23 16:21:56 +02:00

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/*
* NotchLC decoder
* Copyright (c) 2020 Paul B Mahol
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BITSTREAM_READER_LE
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"
#include "lzf.h"
#include "thread.h"
typedef struct NotchLCContext {
unsigned compressed_size;
unsigned format;
uint8_t *uncompressed_buffer;
unsigned uncompressed_size;
uint8_t *lzf_buffer;
int64_t lzf_size;
unsigned texture_size_x;
unsigned texture_size_y;
unsigned y_data_row_offsets;
unsigned uv_offset_data_offset;
unsigned y_control_data_offset;
unsigned a_control_word_offset;
unsigned y_data_offset;
unsigned uv_data_offset;
unsigned y_data_size;
unsigned a_data_offset;
unsigned uv_count_offset;
unsigned a_count_size;
unsigned data_end;
GetByteContext gb;
PutByteContext pb;
} NotchLCContext;
static av_cold int decode_init(AVCodecContext *avctx)
{
avctx->pix_fmt = AV_PIX_FMT_YUVA444P12;
avctx->color_range = AVCOL_RANGE_JPEG;
avctx->colorspace = AVCOL_SPC_RGB;
avctx->color_primaries = AVCOL_PRI_BT709;
avctx->color_trc = AVCOL_TRC_IEC61966_2_1;
return 0;
}
#define HISTORY_SIZE (64 * 1024)
static int lz4_decompress(AVCodecContext *avctx,
GetByteContext *gb,
PutByteContext *pb)
{
unsigned reference_pos, match_length, delta, pos = 0;
uint8_t history[64 * 1024];
while (bytestream2_get_bytes_left(gb) > 0) {
uint8_t token = bytestream2_get_byte(gb);
unsigned num_literals = token >> 4;
if (num_literals == 15) {
unsigned char current;
do {
current = bytestream2_get_byte(gb);
num_literals += current;
} while (current == 255);
}
if (pos + num_literals < HISTORY_SIZE) {
bytestream2_get_buffer(gb, history + pos, num_literals);
pos += num_literals;
} else {
while (num_literals-- > 0) {
history[pos++] = bytestream2_get_byte(gb);
if (pos == HISTORY_SIZE) {
bytestream2_put_buffer(pb, history, HISTORY_SIZE);
pos = 0;
}
}
}
if (bytestream2_get_bytes_left(gb) <= 0)
break;
delta = bytestream2_get_byte(gb);
delta |= (unsigned)bytestream2_get_byte(gb) << 8;
if (delta == 0)
return 0;
match_length = 4 + (token & 0x0F);
if (match_length == 4 + 0x0F) {
uint8_t current;
do {
current = bytestream2_get_byte(gb);
match_length += current;
} while (current == 255);
}
reference_pos = (pos >= delta) ? (pos - delta) : (HISTORY_SIZE + pos - delta);
if (pos + match_length < HISTORY_SIZE && reference_pos + match_length < HISTORY_SIZE) {
if (pos >= reference_pos + match_length || reference_pos >= pos + match_length) {
memcpy(history + pos, history + reference_pos, match_length);
pos += match_length;
} else {
while (match_length-- > 0)
history[pos++] = history[reference_pos++];
}
} else {
while (match_length-- > 0) {
history[pos++] = history[reference_pos++];
if (pos == HISTORY_SIZE) {
bytestream2_put_buffer(pb, history, HISTORY_SIZE);
pos = 0;
}
reference_pos %= HISTORY_SIZE;
}
}
}
bytestream2_put_buffer(pb, history, pos);
return bytestream2_tell_p(pb);
}
static int decode_blocks(AVCodecContext *avctx, AVFrame *p, ThreadFrame *frame,
unsigned uncompressed_size)
{
NotchLCContext *s = avctx->priv_data;
GetByteContext rgb, dgb, *gb = &s->gb;
GetBitContext bit;
int ylinesize, ulinesize, vlinesize, alinesize;
uint16_t *dsty, *dstu, *dstv, *dsta;
int ret;
s->texture_size_x = bytestream2_get_le32(gb);
s->texture_size_y = bytestream2_get_le32(gb);
ret = ff_set_dimensions(avctx, s->texture_size_x, s->texture_size_y);
if (ret < 0)
return ret;
s->uv_offset_data_offset = bytestream2_get_le32(gb);
if (s->uv_offset_data_offset >= UINT_MAX / 4)
return AVERROR_INVALIDDATA;
s->uv_offset_data_offset *= 4;
if (s->uv_offset_data_offset >= uncompressed_size)
return AVERROR_INVALIDDATA;
s->y_control_data_offset = bytestream2_get_le32(gb);
if (s->y_control_data_offset >= UINT_MAX / 4)
return AVERROR_INVALIDDATA;
s->y_control_data_offset *= 4;
if (s->y_control_data_offset >= uncompressed_size)
return AVERROR_INVALIDDATA;
s->a_control_word_offset = bytestream2_get_le32(gb);
if (s->a_control_word_offset >= UINT_MAX / 4)
return AVERROR_INVALIDDATA;
s->a_control_word_offset *= 4;
if (s->a_control_word_offset >= uncompressed_size)
return AVERROR_INVALIDDATA;
s->uv_data_offset = bytestream2_get_le32(gb);
if (s->uv_data_offset >= UINT_MAX / 4)
return AVERROR_INVALIDDATA;
s->uv_data_offset *= 4;
if (s->uv_data_offset >= uncompressed_size)
return AVERROR_INVALIDDATA;
s->y_data_size = bytestream2_get_le32(gb);
if (s->y_data_size >= UINT_MAX / 4)
return AVERROR_INVALIDDATA;
s->a_data_offset = bytestream2_get_le32(gb);
if (s->a_data_offset >= UINT_MAX / 4)
return AVERROR_INVALIDDATA;
s->a_data_offset *= 4;
if (s->a_data_offset >= uncompressed_size)
return AVERROR_INVALIDDATA;
s->a_count_size = bytestream2_get_le32(gb);
if (s->a_count_size >= UINT_MAX / 4)
return AVERROR_INVALIDDATA;
s->a_count_size *= 4;
if (s->a_count_size >= uncompressed_size)
return AVERROR_INVALIDDATA;
s->data_end = bytestream2_get_le32(gb);
if (s->data_end > uncompressed_size)
return AVERROR_INVALIDDATA;
s->y_data_row_offsets = bytestream2_tell(gb);
if (s->data_end <= s->y_data_size)
return AVERROR_INVALIDDATA;
s->y_data_offset = s->data_end - s->y_data_size;
if (s->y_data_offset <= s->a_data_offset)
return AVERROR_INVALIDDATA;
s->uv_count_offset = s->y_data_offset - s->a_data_offset;
if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
return ret;
rgb = *gb;
dgb = *gb;
bytestream2_seek(&rgb, s->y_data_row_offsets, SEEK_SET);
bytestream2_seek(gb, s->y_control_data_offset, SEEK_SET);
dsty = (uint16_t *)p->data[0];
dsta = (uint16_t *)p->data[3];
ylinesize = p->linesize[0] / 2;
alinesize = p->linesize[3] / 2;
for (int y = 0; y < avctx->height; y += 4) {
const unsigned row_offset = bytestream2_get_le32(&rgb);
bytestream2_seek(&dgb, s->y_data_offset + row_offset, SEEK_SET);
init_get_bits8(&bit, dgb.buffer, bytestream2_get_bytes_left(&dgb));
for (int x = 0; x < avctx->width; x += 4) {
unsigned item = bytestream2_get_le32(gb);
unsigned y_min = item & 4095;
unsigned y_max = (item >> 12) & 4095;
unsigned y_diff = y_max - y_min;
unsigned control[4];
control[0] = (item >> 24) & 3;
control[1] = (item >> 26) & 3;
control[2] = (item >> 28) & 3;
control[3] = (item >> 30) & 3;
for (int i = 0; i < 4; i++) {
const int nb_bits = control[i] + 1;
const int div = (1 << nb_bits) - 1;
const int add = div - 1;
dsty[x + i * ylinesize + 0] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
dsty[x + i * ylinesize + 1] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
dsty[x + i * ylinesize + 2] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
dsty[x + i * ylinesize + 3] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
}
}
dsty += 4 * ylinesize;
}
rgb = *gb;
dgb = *gb;
bytestream2_seek(gb, s->a_control_word_offset, SEEK_SET);
if (s->uv_count_offset == s->a_control_word_offset) {
for (int y = 0; y < avctx->height; y++) {
for (int x = 0; x < avctx->width; x++)
dsta[x] = 4095;
dsta += alinesize;
}
} else {
for (int y = 0; y < avctx->height; y += 16) {
for (int x = 0; x < avctx->width; x += 16) {
unsigned m = bytestream2_get_le32(gb);
unsigned offset = bytestream2_get_le32(gb);
unsigned alpha0, alpha1;
uint64_t control;
if (offset >= UINT_MAX / 4)
return AVERROR_INVALIDDATA;
offset = offset * 4 + s->uv_data_offset + s->a_data_offset;
if (offset >= s->data_end)
return AVERROR_INVALIDDATA;
bytestream2_seek(&dgb, offset, SEEK_SET);
control = bytestream2_get_le64(&dgb);
alpha0 = control & 0xFF;
alpha1 = (control >> 8) & 0xFF;
control = control >> 16;
for (int by = 0; by < 4; by++) {
for (int bx = 0; bx < 4; bx++) {
switch (m & 3) {
case 0:
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = 0;
}
}
break;
case 1:
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = 4095;
}
}
break;
case 2:
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
dsta[x + (i + by * 4) * alinesize + bx * 4 + j] = (alpha0 + (alpha1 - alpha0) * (control & 7)) << 4;
}
}
break;
default:
return AVERROR_INVALIDDATA;
}
control >>= 3;
m >>= 2;
}
}
}
dsta += 16 * alinesize;
}
}
bytestream2_seek(&rgb, s->uv_offset_data_offset, SEEK_SET);
dstu = (uint16_t *)p->data[1];
dstv = (uint16_t *)p->data[2];
ulinesize = p->linesize[1] / 2;
vlinesize = p->linesize[2] / 2;
for (int y = 0; y < avctx->height; y += 16) {
for (int x = 0; x < avctx->width; x += 16) {
unsigned offset = bytestream2_get_le32(&rgb) * 4;
int u[16][16] = { 0 }, v[16][16] = { 0 };
int u0, v0, u1, v1, udif, vdif;
unsigned escape, is8x8, loc;
bytestream2_seek(&dgb, s->uv_data_offset + offset, SEEK_SET);
is8x8 = bytestream2_get_le16(&dgb);
escape = bytestream2_get_le16(&dgb);
if (escape == 0 && is8x8 == 0) {
u0 = bytestream2_get_byte(&dgb);
v0 = bytestream2_get_byte(&dgb);
u1 = bytestream2_get_byte(&dgb);
v1 = bytestream2_get_byte(&dgb);
loc = bytestream2_get_le32(&dgb);
u0 = (u0 << 4) | (u0 & 0xF);
v0 = (v0 << 4) | (v0 & 0xF);
u1 = (u1 << 4) | (u1 & 0xF);
v1 = (v1 << 4) | (v1 & 0xF);
udif = u1 - u0;
vdif = v1 - v0;
for (int i = 0; i < 16; i += 4) {
for (int j = 0; j < 16; j += 4) {
for (int ii = 0; ii < 4; ii++) {
for (int jj = 0; jj < 4; jj++) {
u[i + ii][j + jj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
v[i + ii][j + jj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
}
}
loc >>= 2;
}
}
} else {
for (int i = 0; i < 16; i += 8) {
for (int j = 0; j < 16; j += 8) {
if (is8x8 & 1) {
u0 = bytestream2_get_byte(&dgb);
v0 = bytestream2_get_byte(&dgb);
u1 = bytestream2_get_byte(&dgb);
v1 = bytestream2_get_byte(&dgb);
loc = bytestream2_get_le32(&dgb);
u0 = (u0 << 4) | (u0 & 0xF);
v0 = (v0 << 4) | (v0 & 0xF);
u1 = (u1 << 4) | (u1 & 0xF);
v1 = (v1 << 4) | (v1 & 0xF);
udif = u1 - u0;
vdif = v1 - v0;
for (int ii = 0; ii < 8; ii += 2) {
for (int jj = 0; jj < 8; jj += 2) {
for (int iii = 0; iii < 2; iii++) {
for (int jjj = 0; jjj < 2; jjj++) {
u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
}
}
loc >>= 2;
}
}
} else if (escape) {
for (int ii = 0; ii < 8; ii += 4) {
for (int jj = 0; jj < 8; jj += 4) {
u0 = bytestream2_get_byte(&dgb);
v0 = bytestream2_get_byte(&dgb);
u1 = bytestream2_get_byte(&dgb);
v1 = bytestream2_get_byte(&dgb);
loc = bytestream2_get_le32(&dgb);
u0 = (u0 << 4) | (u0 & 0xF);
v0 = (v0 << 4) | (v0 & 0xF);
u1 = (u1 << 4) | (u1 & 0xF);
v1 = (v1 << 4) | (v1 & 0xF);
udif = u1 - u0;
vdif = v1 - v0;
for (int iii = 0; iii < 4; iii++) {
for (int jjj = 0; jjj < 4; jjj++) {
u[i + ii + iii][j + jj + jjj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
v[i + ii + iii][j + jj + jjj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
loc >>= 2;
}
}
}
}
}
is8x8 >>= 1;
}
}
}
for (int i = 0; i < 16; i++) {
for (int j = 0; j < 16; j++) {
dstu[x + i * ulinesize + j] = u[i][j];
dstv[x + i * vlinesize + j] = v[i][j];
}
}
}
dstu += 16 * ulinesize;
dstv += 16 * vlinesize;
}
return 0;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
NotchLCContext *s = avctx->priv_data;
ThreadFrame frame = { .f = data };
GetByteContext *gb = &s->gb;
PutByteContext *pb = &s->pb;
unsigned uncompressed_size;
AVFrame *p = data;
int ret;
if (avpkt->size <= 40)
return AVERROR_INVALIDDATA;
bytestream2_init(gb, avpkt->data, avpkt->size);
if (bytestream2_get_le32(gb) != MKBETAG('N','L','C','1'))
return AVERROR_INVALIDDATA;
uncompressed_size = bytestream2_get_le32(gb);
s->compressed_size = bytestream2_get_le32(gb);
s->format = bytestream2_get_le32(gb);
if (s->format > 2)
return AVERROR_PATCHWELCOME;
if (s->format == 0) {
ret = ff_lzf_uncompress(gb, &s->lzf_buffer, &s->lzf_size);
if (ret < 0)
return ret;
if (uncompressed_size > s->lzf_size)
return AVERROR_INVALIDDATA;
bytestream2_init(gb, s->lzf_buffer, uncompressed_size);
} else if (s->format == 1) {
av_fast_padded_malloc(&s->uncompressed_buffer, &s->uncompressed_size,
uncompressed_size);
if (!s->uncompressed_buffer)
return AVERROR(ENOMEM);
bytestream2_init_writer(pb, s->uncompressed_buffer, s->uncompressed_size);
ret = lz4_decompress(avctx, gb, pb);
if (ret != uncompressed_size)
return AVERROR_INVALIDDATA;
bytestream2_init(gb, s->uncompressed_buffer, uncompressed_size);
}
ret = decode_blocks(avctx, p, &frame, uncompressed_size);
if (ret < 0)
return ret;
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
*got_frame = 1;
return avpkt->size;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
NotchLCContext *s = avctx->priv_data;
av_freep(&s->uncompressed_buffer);
s->uncompressed_size = 0;
av_freep(&s->lzf_buffer);
s->lzf_size = 0;
return 0;
}
AVCodec ff_notchlc_decoder = {
.name = "notchlc",
.long_name = NULL_IF_CONFIG_SMALL("NotchLC"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_NOTCHLC,
.priv_data_size = sizeof(NotchLCContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
};
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