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/* |
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* VBLE Decoder |
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* Copyright (c) 2011 Derek Buitenhuis |
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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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/** |
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* @file |
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* VBLE Decoder |
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*/ |
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#include "libavutil/imgutils.h" |
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#define BITSTREAM_READER_LE |
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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "internal.h" |
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#include "lossless_videodsp.h" |
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#include "mathops.h" |
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#include "thread.h" |
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typedef struct VBLEContext { |
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AVCodecContext *avctx; |
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LLVidDSPContext llviddsp; |
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int size; |
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uint8_t *val; ///< This array first holds the lengths of vlc symbols and then their value. |
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} VBLEContext; |
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static int vble_unpack(VBLEContext *ctx, GetBitContext *gb) |
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{ |
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int i; |
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int allbits = 0; |
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static const uint8_t LUT[256] = { |
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8,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0, |
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5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0, |
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6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0, |
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5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0, |
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7,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0, |
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5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0, |
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6,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0, |
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5,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0,4,0,1,0,2,0,1,0,3,0,1,0,2,0,1,0, |
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}; |
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/* Read all the lengths in first */ |
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✓✓ |
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for (i = 0; i < ctx->size; i++) { |
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/* At most we need to read 9 bits total to get indices up to 8 */ |
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int val = show_bits(gb, 8); |
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// read reverse unary |
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✓✓ |
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if (val) { |
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val = LUT[val]; |
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skip_bits(gb, val + 1); |
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ctx->val[i] = val; |
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} else { |
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skip_bits(gb, 8); |
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✓✓ |
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if (!get_bits1(gb)) |
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return -1; |
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ctx->val[i] = 8; |
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} |
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allbits += ctx->val[i]; |
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} |
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/* Check we have enough bits left */ |
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✗✓ |
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if (get_bits_left(gb) < allbits) |
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return -1; |
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return 0; |
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} |
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static void vble_restore_plane(VBLEContext *ctx, AVFrame *pic, |
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GetBitContext *gb, int plane, |
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int offset, int width, int height) |
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{ |
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uint8_t *dst = pic->data[plane]; |
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uint8_t *val = ctx->val + offset; |
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int stride = pic->linesize[plane]; |
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int i, j, left, left_top; |
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✓✓ |
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for (i = 0; i < height; i++) { |
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✓✓ |
5535360 |
for (j = 0; j < width; j++) { |
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/* get_bits can't take a length of 0 */ |
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✓✓ |
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if (val[j]) { |
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int v = (1 << val[j]) + get_bits(gb, val[j]) - 1; |
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val[j] = (v >> 1) ^ -(v & 1); |
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} |
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} |
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✓✓ |
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if (i) { |
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left = 0; |
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left_top = dst[-stride]; |
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ctx->llviddsp.add_median_pred(dst, dst - stride, val, |
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width, &left, &left_top); |
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} else { |
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dst[0] = val[0]; |
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✓✓ |
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for (j = 1; j < width; j++) |
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dst[j] = val[j] + dst[j - 1]; |
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} |
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dst += stride; |
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val += width; |
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} |
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} |
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static int vble_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
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AVPacket *avpkt) |
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{ |
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VBLEContext *ctx = avctx->priv_data; |
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AVFrame *pic = data; |
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GetBitContext gb; |
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const uint8_t *src = avpkt->data; |
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int version; |
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int offset = 0; |
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int width_uv = avctx->width / 2, height_uv = avctx->height / 2; |
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int ret; |
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ThreadFrame frame = { .f = data }; |
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✓✗✗✓
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if (avpkt->size < 4 || avpkt->size - 4 > INT_MAX/8) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid packet size\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* Allocate buffer */ |
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✗✓ |
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if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) |
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return ret; |
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/* Set flags */ |
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pic->key_frame = 1; |
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pic->pict_type = AV_PICTURE_TYPE_I; |
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/* Version should always be 1 */ |
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version = AV_RL32(src); |
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✗✓ |
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if (version != 1) |
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av_log(avctx, AV_LOG_WARNING, "Unsupported VBLE Version: %d\n", version); |
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init_get_bits(&gb, src + 4, (avpkt->size - 4) * 8); |
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/* Unpack */ |
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✓✓ |
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if (vble_unpack(ctx, &gb) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid Code\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* Restore planes. Should be almost identical to Huffyuv's. */ |
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vble_restore_plane(ctx, pic, &gb, 0, offset, avctx->width, avctx->height); |
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/* Chroma */ |
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✓✗ |
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if (!(ctx->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
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offset += avctx->width * avctx->height; |
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vble_restore_plane(ctx, pic, &gb, 1, offset, width_uv, height_uv); |
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offset += width_uv * height_uv; |
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vble_restore_plane(ctx, pic, &gb, 2, offset, width_uv, height_uv); |
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} |
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*got_frame = 1; |
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return avpkt->size; |
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} |
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static av_cold int vble_decode_close(AVCodecContext *avctx) |
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{ |
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VBLEContext *ctx = avctx->priv_data; |
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av_freep(&ctx->val); |
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return 0; |
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} |
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static av_cold int vble_decode_init(AVCodecContext *avctx) |
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{ |
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VBLEContext *ctx = avctx->priv_data; |
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/* Stash for later use */ |
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ctx->avctx = avctx; |
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ff_llviddsp_init(&ctx->llviddsp); |
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avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
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avctx->bits_per_raw_sample = 8; |
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ctx->size = av_image_get_buffer_size(avctx->pix_fmt, |
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avctx->width, avctx->height, 1); |
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ctx->val = av_malloc_array(ctx->size, sizeof(*ctx->val)); |
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✗✓ |
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if (!ctx->val) { |
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av_log(avctx, AV_LOG_ERROR, "Could not allocate values buffer.\n"); |
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return AVERROR(ENOMEM); |
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} |
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return 0; |
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} |
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AVCodec ff_vble_decoder = { |
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.name = "vble", |
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.long_name = NULL_IF_CONFIG_SMALL("VBLE Lossless Codec"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_VBLE, |
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.priv_data_size = sizeof(VBLEContext), |
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.init = vble_decode_init, |
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.close = vble_decode_close, |
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.decode = vble_decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, |
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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}; |