diff options
Diffstat (limited to 'ffmpeg1/libavcodec/vble.c')
| -rw-r--r-- | ffmpeg1/libavcodec/vble.c | 213 |
1 files changed, 0 insertions, 213 deletions
diff --git a/ffmpeg1/libavcodec/vble.c b/ffmpeg1/libavcodec/vble.c deleted file mode 100644 index cbb2ffc..0000000 --- a/ffmpeg1/libavcodec/vble.c +++ /dev/null @@ -1,213 +0,0 @@ -/* - * 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 - */ - -#define BITSTREAM_READER_LE - -#include "avcodec.h" -#include "dsputil.h" -#include "get_bits.h" -#include "internal.h" -#include "mathops.h" - -typedef struct { - AVCodecContext *avctx; - DSPContext dsp; - - int size; - uint8_t *val; ///< This array first holds the lengths of vlc symbols and then their value. -} VBLEContext; - -static int vble_unpack(VBLEContext *ctx, GetBitContext *gb) -{ - int i; - int allbits = 0; - 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, - }; - - /* Read all the lengths in first */ - for (i = 0; i < ctx->size; i++) { - /* 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); - ctx->val[i] = val; - } else { - skip_bits(gb, 8); - if (!get_bits1(gb)) - return -1; - ctx->val[i] = 8; - } - allbits += ctx->val[i]; - } - - /* Check we have enough bits left */ - if (get_bits_left(gb) < allbits) - return -1; - return 0; -} - -static void vble_restore_plane(VBLEContext *ctx, AVFrame *pic, - GetBitContext *gb, int plane, - int offset, int width, int height) -{ - uint8_t *dst = pic->data[plane]; - uint8_t *val = ctx->val + offset; - int stride = pic->linesize[plane]; - int i, j, left, left_top; - - for (i = 0; i < height; i++) { - for (j = 0; j < width; j++) { - /* 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); - } - } - if (i) { - left = 0; - left_top = dst[-stride]; - ctx->dsp.add_hfyu_median_prediction(dst, dst-stride, val, width, &left, &left_top); - } else { - dst[0] = val[0]; - for (j = 1; j < width; j++) - dst[j] = val[j] + dst[j - 1]; - } - dst += stride; - val += width; - } -} - -static int vble_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, - AVPacket *avpkt) -{ - VBLEContext *ctx = avctx->priv_data; - AVFrame *pic = data; - GetBitContext gb; - const uint8_t *src = avpkt->data; - int version; - int offset = 0; - int width_uv = avctx->width / 2, height_uv = avctx->height / 2; - int ret; - - if (avpkt->size < 4 || avpkt->size - 4 > INT_MAX/8) { - av_log(avctx, AV_LOG_ERROR, "Invalid packet size\n"); - return AVERROR_INVALIDDATA; - } - - /* Allocate buffer */ - if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) - return ret; - - /* Set flags */ - pic->key_frame = 1; - pic->pict_type = AV_PICTURE_TYPE_I; - - /* Version should always be 1 */ - version = AV_RL32(src); - - if (version != 1) - av_log(avctx, AV_LOG_WARNING, "Unsupported VBLE Version: %d\n", version); - - 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. */ - vble_restore_plane(ctx, pic, &gb, 0, offset, avctx->width, avctx->height); - - /* Chroma */ - if (!(ctx->avctx->flags & CODEC_FLAG_GRAY)) { - offset += avctx->width * avctx->height; - vble_restore_plane(ctx, pic, &gb, 1, offset, width_uv, height_uv); - - offset += width_uv * height_uv; - vble_restore_plane(ctx, pic, &gb, 2, offset, width_uv, height_uv); - } - - *got_frame = 1; - - 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; - ff_dsputil_init(&ctx->dsp, avctx); - - avctx->pix_fmt = AV_PIX_FMT_YUV420P; - avctx->bits_per_raw_sample = 8; - - ctx->size = avpicture_get_size(avctx->pix_fmt, - avctx->width, avctx->height); - - ctx->val = av_malloc(ctx->size * sizeof(*ctx->val)); - - if (!ctx->val) { - av_log(avctx, AV_LOG_ERROR, "Could not allocate values buffer.\n"); - vble_decode_close(avctx); - return AVERROR(ENOMEM); - } - - return 0; -} - -AVCodec ff_vble_decoder = { - .name = "vble", - .type = AVMEDIA_TYPE_VIDEO, - .id = AV_CODEC_ID_VBLE, - .priv_data_size = sizeof(VBLEContext), - .init = vble_decode_init, - .close = vble_decode_close, - .decode = vble_decode_frame, - .capabilities = CODEC_CAP_DR1, - .long_name = NULL_IF_CONFIG_SMALL("VBLE Lossless Codec"), -}; |