480 lines
16 KiB
C
480 lines
16 KiB
C
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/*
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* NotchLC decoder
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* Copyright (c) 2020 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define BITSTREAM_READER_LE
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "lzf.h"
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#include "thread.h"
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typedef struct NotchLCContext {
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unsigned compressed_size;
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unsigned format;
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uint8_t *uncompressed_buffer;
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unsigned uncompressed_size;
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uint8_t *lzf_buffer;
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int64_t lzf_size;
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unsigned texture_size_x;
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unsigned texture_size_y;
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unsigned y_data_row_offsets;
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unsigned uv_offset_data_offset;
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unsigned y_control_data_offset;
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unsigned a_control_word_offset;
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unsigned y_data_offset;
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unsigned uv_data_offset;
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unsigned y_data_size;
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unsigned uv_count_size;
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unsigned uv_count_offset;
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unsigned a_count_size;
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unsigned data_end;
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GetByteContext gb;
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PutByteContext pb;
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} NotchLCContext;
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_YUV444P12;
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avctx->color_range = AVCOL_RANGE_JPEG;
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avctx->colorspace = AVCOL_SPC_RGB;
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avctx->color_primaries = AVCOL_PRI_BT709;
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avctx->color_trc = AVCOL_TRC_IEC61966_2_1;
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return 0;
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}
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#define HISTORY_SIZE (64 * 1024)
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static int lz4_decompress(AVCodecContext *avctx,
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GetByteContext *gb,
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PutByteContext *pb)
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{
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unsigned reference_pos, match_length, delta, pos = 0;
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uint8_t history[64 * 1024];
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while (bytestream2_get_bytes_left(gb) > 0) {
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uint8_t token = bytestream2_get_byte(gb);
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unsigned num_literals = token >> 4;
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if (num_literals == 15) {
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unsigned char current;
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do {
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current = bytestream2_get_byte(gb);
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num_literals += current;
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} while (current == 255);
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}
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if (pos + num_literals < HISTORY_SIZE) {
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bytestream2_get_buffer(gb, history + pos, num_literals);
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pos += num_literals;
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} else {
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while (num_literals-- > 0) {
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history[pos++] = bytestream2_get_byte(gb);
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if (pos == HISTORY_SIZE) {
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bytestream2_put_buffer(pb, history, HISTORY_SIZE);
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pos = 0;
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}
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}
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}
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if (bytestream2_get_bytes_left(gb) <= 0)
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break;
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delta = bytestream2_get_byte(gb);
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delta |= (unsigned)bytestream2_get_byte(gb) << 8;
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if (delta == 0)
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return 0;
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match_length = 4 + (token & 0x0F);
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if (match_length == 4 + 0x0F) {
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uint8_t current;
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do {
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current = bytestream2_get_byte(gb);
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match_length += current;
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} while (current == 255);
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}
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reference_pos = (pos >= delta) ? (pos - delta) : (HISTORY_SIZE + pos - delta);
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if (pos + match_length < HISTORY_SIZE && reference_pos + match_length < HISTORY_SIZE) {
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if (pos >= reference_pos + match_length || reference_pos >= pos + match_length) {
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memcpy(history + pos, history + reference_pos, match_length);
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pos += match_length;
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} else {
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while (match_length-- > 0)
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history[pos++] = history[reference_pos++];
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}
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} else {
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while (match_length-- > 0) {
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history[pos++] = history[reference_pos++];
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if (pos == HISTORY_SIZE) {
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bytestream2_put_buffer(pb, history, HISTORY_SIZE);
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pos = 0;
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}
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reference_pos %= HISTORY_SIZE;
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}
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}
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}
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bytestream2_put_buffer(pb, history, pos);
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return bytestream2_tell_p(pb);
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}
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static int decode_blocks(AVCodecContext *avctx, AVFrame *p, ThreadFrame *frame,
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unsigned uncompressed_size)
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{
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NotchLCContext *s = avctx->priv_data;
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GetByteContext rgb, dgb, *gb = &s->gb;
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GetBitContext bit;
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int ylinesize, ulinesize, vlinesize, alinesize;
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uint16_t *dsty, *dstu, *dstv, *dsta;
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int ret;
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s->texture_size_x = bytestream2_get_le32(gb);
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s->texture_size_y = bytestream2_get_le32(gb);
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ret = ff_set_dimensions(avctx, s->texture_size_x, s->texture_size_y);
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if (ret < 0)
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return ret;
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s->uv_offset_data_offset = bytestream2_get_le32(gb);
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if (s->uv_offset_data_offset >= UINT_MAX / 4)
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return AVERROR_INVALIDDATA;
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s->uv_offset_data_offset *= 4;
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if (s->uv_offset_data_offset >= uncompressed_size)
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return AVERROR_INVALIDDATA;
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s->y_control_data_offset = bytestream2_get_le32(gb);
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if (s->y_control_data_offset >= UINT_MAX / 4)
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return AVERROR_INVALIDDATA;
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s->y_control_data_offset *= 4;
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if (s->y_control_data_offset >= uncompressed_size)
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return AVERROR_INVALIDDATA;
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s->a_control_word_offset = bytestream2_get_le32(gb);
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if (s->a_control_word_offset >= UINT_MAX / 4)
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return AVERROR_INVALIDDATA;
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s->a_control_word_offset *= 4;
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if (s->a_control_word_offset >= uncompressed_size)
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return AVERROR_INVALIDDATA;
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s->uv_data_offset = bytestream2_get_le32(gb);
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if (s->uv_data_offset >= UINT_MAX / 4)
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return AVERROR_INVALIDDATA;
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s->uv_data_offset *= 4;
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if (s->uv_data_offset >= uncompressed_size)
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return AVERROR_INVALIDDATA;
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s->y_data_size = bytestream2_get_le32(gb);
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if (s->y_data_size >= UINT_MAX / 4)
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return AVERROR_INVALIDDATA;
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s->uv_count_size = bytestream2_get_le32(gb);
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if (s->uv_count_size >= UINT_MAX / 4)
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return AVERROR_INVALIDDATA;
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s->uv_count_size *= 4;
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if (s->uv_count_size >= uncompressed_size)
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return AVERROR_INVALIDDATA;
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s->a_count_size = bytestream2_get_le32(gb);
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if (s->a_count_size >= UINT_MAX / 4)
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return AVERROR_INVALIDDATA;
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s->a_count_size *= 4;
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if (s->a_count_size >= uncompressed_size)
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return AVERROR_INVALIDDATA;
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s->data_end = bytestream2_get_le32(gb);
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if (s->data_end > uncompressed_size)
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return AVERROR_INVALIDDATA;
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s->y_data_row_offsets = bytestream2_tell(gb);
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if (s->data_end <= s->y_data_size)
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return AVERROR_INVALIDDATA;
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s->y_data_offset = s->data_end - s->y_data_size;
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if (s->y_data_offset <= s->uv_count_size)
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return AVERROR_INVALIDDATA;
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s->uv_count_offset = s->y_data_offset - s->uv_count_size;
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if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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rgb = *gb;
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dgb = *gb;
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bytestream2_seek(&rgb, s->y_data_row_offsets, SEEK_SET);
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bytestream2_seek(gb, s->y_control_data_offset, SEEK_SET);
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dsty = (uint16_t *)p->data[0];
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dsta = (uint16_t *)p->data[3];
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ylinesize = p->linesize[0] / 2;
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alinesize = p->linesize[3] / 2;
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for (int y = 0; y < avctx->height; y += 4) {
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const unsigned row_offset = bytestream2_get_le32(&rgb);
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bytestream2_seek(&dgb, s->y_data_offset + row_offset, SEEK_SET);
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init_get_bits8(&bit, dgb.buffer, bytestream2_get_bytes_left(&dgb));
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for (int x = 0; x < avctx->width; x += 4) {
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unsigned item = bytestream2_get_le32(gb);
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unsigned y_min = item & 4095;
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unsigned y_max = (item >> 12) & 4095;
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unsigned y_diff = y_max - y_min;
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unsigned control[4];
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control[0] = (item >> 24) & 3;
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control[1] = (item >> 26) & 3;
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control[2] = (item >> 28) & 3;
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control[3] = (item >> 30) & 3;
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for (int i = 0; i < 4; i++) {
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const int nb_bits = control[i] + 1;
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const int div = (1 << nb_bits) - 1;
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const int add = div - 1;
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dsty[x + i * ylinesize + 0] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
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dsty[x + i * ylinesize + 1] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
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dsty[x + i * ylinesize + 2] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
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dsty[x + i * ylinesize + 3] = av_clip_uintp2(y_min + ((y_diff * get_bits(&bit, nb_bits) + add) / div), 12);
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}
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}
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dsty += 4 * ylinesize;
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dsta += 4 * alinesize;
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}
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rgb = *gb;
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dgb = *gb;
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bytestream2_seek(&rgb, s->uv_offset_data_offset, SEEK_SET);
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bytestream2_seek(gb, s->a_control_word_offset, SEEK_SET);
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dstu = (uint16_t *)p->data[1];
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dstv = (uint16_t *)p->data[2];
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ulinesize = p->linesize[1] / 2;
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vlinesize = p->linesize[2] / 2;
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for (int y = 0; y < avctx->height; y += 16) {
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for (int x = 0; x < avctx->width; x += 16) {
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unsigned offset = bytestream2_get_le32(&rgb) * 4;
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int u[16][16] = { 0 }, v[16][16] = { 0 };
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int u0, v0, u1, v1, udif, vdif;
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unsigned escape, is8x8, loc;
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bytestream2_seek(&dgb, s->uv_data_offset + offset, SEEK_SET);
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is8x8 = bytestream2_get_le16(&dgb);
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escape = bytestream2_get_le16(&dgb);
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if (escape == 0 && is8x8 == 0) {
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u0 = bytestream2_get_byte(&dgb);
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v0 = bytestream2_get_byte(&dgb);
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u1 = bytestream2_get_byte(&dgb);
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v1 = bytestream2_get_byte(&dgb);
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loc = bytestream2_get_le32(&dgb);
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u0 = (u0 << 4) | (u0 & 0xF);
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v0 = (v0 << 4) | (v0 & 0xF);
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u1 = (u1 << 4) | (u1 & 0xF);
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v1 = (v1 << 4) | (v1 & 0xF);
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udif = u1 - u0;
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vdif = v1 - v0;
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for (int i = 0; i < 16; i += 4) {
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for (int j = 0; j < 16; j += 4) {
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for (int ii = 0; ii < 4; ii++) {
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for (int jj = 0; jj < 4; jj++) {
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u[i + ii][j + jj] = u0 + ((udif * (int)(loc & 3) + 2) / 3);
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v[i + ii][j + jj] = v0 + ((vdif * (int)(loc & 3) + 2) / 3);
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}
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}
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loc >>= 2;
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}
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}
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} else {
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for (int i = 0; i < 16; i += 8) {
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for (int j = 0; j < 16; j += 8) {
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if (is8x8 & 1) {
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u0 = bytestream2_get_byte(&dgb);
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v0 = bytestream2_get_byte(&dgb);
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u1 = bytestream2_get_byte(&dgb);
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v1 = bytestream2_get_byte(&dgb);
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loc = bytestream2_get_le32(&dgb);
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u0 = (u0 << 4) | (u0 & 0xF);
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v0 = (v0 << 4) | (v0 & 0xF);
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u1 = (u1 << 4) | (u1 & 0xF);
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v1 = (v1 << 4) | (v1 & 0xF);
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udif = u1 - u0;
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vdif = v1 - v0;
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for (int ii = 0; ii < 8; ii += 2) {
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for (int jj = 0; jj < 8; jj += 2) {
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for (int iii = 0; iii < 2; iii++) {
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for (int jjj = 0; jjj < 2; jjj++) {
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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,
|
||
|
|
};
|