0c251257 | /* * VBLE Decoder * Copyright (c) 2011 Derek Buitenhuis * * 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 * VBLE Decoder */ |
f890677d | #include "libavutil/imgutils.h" |
b6686629 | #define BITSTREAM_READER_LE |
0c251257 | #include "avcodec.h" #include "get_bits.h" |
594d4d5d | #include "internal.h" |
5ac1dd8e | #include "lossless_videodsp.h" |
d5c62122 | #include "mathops.h" |
d93495c9 | #include "thread.h" |
0c251257 | |
7f9f771e | typedef struct VBLEContext { |
0c251257 | AVCodecContext *avctx; |
5ac1dd8e | LLVidDSPContext llviddsp; |
0c251257 | int size; |
2fea60c6 | uint8_t *val; ///< This array first holds the lengths of vlc symbols and then their value. |
0c251257 | } VBLEContext; |
e3618cd4 | static int vble_unpack(VBLEContext *ctx, GetBitContext *gb) |
0c251257 | { |
e3618cd4 | int i; |
dde0af2d | int allbits = 0; |
35fd7b29 | static const uint8_t LUT[256] = { 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, 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, 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, 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, 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, 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, 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, 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, }; |
0c251257 | /* Read all the lengths in first */ for (i = 0; i < ctx->size; i++) { |
e3618cd4 | /* At most we need to read 9 bits total to get indices up to 8 */ int val = show_bits(gb, 8); // read reverse unary if (val) { val = LUT[val]; skip_bits(gb, val + 1); |
2fea60c6 | ctx->val[i] = val; |
e3618cd4 | } else { skip_bits(gb, 8); if (!get_bits1(gb)) return -1; |
2fea60c6 | ctx->val[i] = 8; |
e3618cd4 | } |
2fea60c6 | allbits += ctx->val[i]; |
0c251257 | } |
dde0af2d | /* Check we have enough bits left */ if (get_bits_left(gb) < allbits) return -1; |
0c251257 | return 0; } |
759001c5 | static void vble_restore_plane(VBLEContext *ctx, AVFrame *pic, |
80e9e63c | GetBitContext *gb, int plane, |
75c0ddc9 | int offset, int width, int height) |
0c251257 | { uint8_t *dst = pic->data[plane]; uint8_t *val = ctx->val + offset; int stride = pic->linesize[plane]; |
ecf5e705 | int i, j, left, left_top; |
0c251257 | for (i = 0; i < height; i++) { for (j = 0; j < width; j++) { |
75c0ddc9 | /* get_bits can't take a length of 0 */ if (val[j]) { int v = (1 << val[j]) + get_bits(gb, val[j]) - 1; val[j] = (v >> 1) ^ -(v & 1); } |
ecf5e705 | } if (i) { left = 0; left_top = dst[-stride]; |
5ac1dd8e | ctx->llviddsp.add_median_pred(dst, dst - stride, val, width, &left, &left_top); |
ecf5e705 | } else { dst[0] = val[0]; for (j = 1; j < width; j++) dst[j] = val[j] + dst[j - 1]; |
0c251257 | } dst += stride; val += width; } } |
df9b9567 | static int vble_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
0c251257 | AVPacket *avpkt) { VBLEContext *ctx = avctx->priv_data; |
759001c5 | AVFrame *pic = data; |
0c251257 | GetBitContext gb; const uint8_t *src = avpkt->data; int version; int offset = 0; int width_uv = avctx->width / 2, height_uv = avctx->height / 2; |
1ec94b0f | int ret; |
d93495c9 | ThreadFrame frame = { .f = data }; |
0c251257 | |
0b28abf9 | if (avpkt->size < 4 || avpkt->size - 4 > INT_MAX/8) { av_log(avctx, AV_LOG_ERROR, "Invalid packet size\n"); return AVERROR_INVALIDDATA; } |
0c251257 | /* Allocate buffer */ |
d93495c9 | if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) |
1ec94b0f | return ret; |
0c251257 | /* Set flags */ pic->key_frame = 1; |
7099f365 | pic->pict_type = AV_PICTURE_TYPE_I; |
0c251257 | /* Version should always be 1 */ version = AV_RL32(src); |
1b20877f | if (version != 1) |
45d8537c | av_log(avctx, AV_LOG_WARNING, "Unsupported VBLE Version: %d\n", version); |
0c251257 | init_get_bits(&gb, src + 4, (avpkt->size - 4) * 8); /* Unpack */ if (vble_unpack(ctx, &gb) < 0) { av_log(avctx, AV_LOG_ERROR, "Invalid Code\n"); return AVERROR_INVALIDDATA; } /* Restore planes. Should be almost identical to Huffyuv's. */ |
80e9e63c | vble_restore_plane(ctx, pic, &gb, 0, offset, avctx->width, avctx->height); |
0c251257 | /* Chroma */ |
7c6eb0a1 | if (!(ctx->avctx->flags & AV_CODEC_FLAG_GRAY)) { |
0c251257 | offset += avctx->width * avctx->height; |
80e9e63c | vble_restore_plane(ctx, pic, &gb, 1, offset, width_uv, height_uv); |
0c251257 | offset += width_uv * height_uv; |
80e9e63c | vble_restore_plane(ctx, pic, &gb, 2, offset, width_uv, height_uv); |
0c251257 | } |
df9b9567 | *got_frame = 1; |
0c251257 | return avpkt->size; } static av_cold int vble_decode_close(AVCodecContext *avctx) { VBLEContext *ctx = avctx->priv_data; av_freep(&ctx->val); return 0; } static av_cold int vble_decode_init(AVCodecContext *avctx) { VBLEContext *ctx = avctx->priv_data; /* Stash for later use */ ctx->avctx = avctx; |
47f21232 | ff_llviddsp_init(&ctx->llviddsp); |
0c251257 | |
716d413c | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
0c251257 | avctx->bits_per_raw_sample = 8; |
f890677d | ctx->size = av_image_get_buffer_size(avctx->pix_fmt, avctx->width, avctx->height, 1); |
0c251257 | |
58a53123 | ctx->val = av_malloc_array(ctx->size, sizeof(*ctx->val)); |
0c251257 | |
6761b6b8 | if (!ctx->val) { av_log(avctx, AV_LOG_ERROR, "Could not allocate values buffer.\n"); vble_decode_close(avctx); return AVERROR(ENOMEM); } |
0c251257 | return 0; } AVCodec ff_vble_decoder = { .name = "vble", |
b2bed932 | .long_name = NULL_IF_CONFIG_SMALL("VBLE Lossless Codec"), |
0c251257 | .type = AVMEDIA_TYPE_VIDEO, |
36ef5369 | .id = AV_CODEC_ID_VBLE, |
0c251257 | .priv_data_size = sizeof(VBLEContext), .init = vble_decode_init, .close = vble_decode_close, .decode = vble_decode_frame, |
d93495c9 | .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, .init_thread_copy = ONLY_IF_THREADS_ENABLED(vble_decode_init), |
91ed4e71 | .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
0c251257 | }; |