3 * Copyright (c) 2011 Derek Buitenhuis
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #define BITSTREAM_READER_LE
29 #include "libavutil/imgutils.h"
33 #include "huffyuvdsp.h"
38 typedef struct VBLEContext {
39 AVCodecContext *avctx;
40 HuffYUVDSPContext hdsp;
43 uint8_t *val; ///< This array first holds the lengths of vlc symbols and then their value.
46 static int vble_unpack(VBLEContext *ctx, GetBitContext *gb)
50 static const uint8_t LUT[256] = {
51 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,
52 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,
53 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,
54 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,
55 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,
56 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,
57 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,
58 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,
61 /* Read all the lengths in first */
62 for (i = 0; i < ctx->size; i++) {
63 /* At most we need to read 9 bits total to get indices up to 8 */
64 int val = show_bits(gb, 8);
69 skip_bits(gb, val + 1);
77 allbits += ctx->val[i];
80 /* Check we have enough bits left */
81 if (get_bits_left(gb) < allbits)
86 static void vble_restore_plane(VBLEContext *ctx, AVFrame *pic,
87 GetBitContext *gb, int plane,
88 int offset, int width, int height)
90 uint8_t *dst = pic->data[plane];
91 uint8_t *val = ctx->val + offset;
92 int stride = pic->linesize[plane];
93 int i, j, left, left_top;
95 for (i = 0; i < height; i++) {
96 for (j = 0; j < width; j++) {
97 /* get_bits can't take a length of 0 */
99 int v = (1 << val[j]) + get_bits(gb, val[j]) - 1;
100 val[j] = (v >> 1) ^ -(v & 1);
105 left_top = dst[-stride];
106 ctx->hdsp.add_hfyu_median_pred(dst, dst - stride, val,
107 width, &left, &left_top);
110 for (j = 1; j < width; j++)
111 dst[j] = val[j] + dst[j - 1];
118 static int vble_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
121 VBLEContext *ctx = avctx->priv_data;
124 const uint8_t *src = avpkt->data;
127 int width_uv = avctx->width / 2, height_uv = avctx->height / 2;
129 ThreadFrame frame = { .f = data };
131 if (avpkt->size < 4 || avpkt->size - 4 > INT_MAX/8) {
132 av_log(avctx, AV_LOG_ERROR, "Invalid packet size\n");
133 return AVERROR_INVALIDDATA;
136 /* Allocate buffer */
137 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
142 pic->pict_type = AV_PICTURE_TYPE_I;
144 /* Version should always be 1 */
145 version = AV_RL32(src);
148 av_log(avctx, AV_LOG_WARNING, "Unsupported VBLE Version: %d\n", version);
150 init_get_bits(&gb, src + 4, (avpkt->size - 4) * 8);
153 if (vble_unpack(ctx, &gb) < 0) {
154 av_log(avctx, AV_LOG_ERROR, "Invalid Code\n");
155 return AVERROR_INVALIDDATA;
158 /* Restore planes. Should be almost identical to Huffyuv's. */
159 vble_restore_plane(ctx, pic, &gb, 0, offset, avctx->width, avctx->height);
162 if (!(ctx->avctx->flags & AV_CODEC_FLAG_GRAY)) {
163 offset += avctx->width * avctx->height;
164 vble_restore_plane(ctx, pic, &gb, 1, offset, width_uv, height_uv);
166 offset += width_uv * height_uv;
167 vble_restore_plane(ctx, pic, &gb, 2, offset, width_uv, height_uv);
175 static av_cold int vble_decode_close(AVCodecContext *avctx)
177 VBLEContext *ctx = avctx->priv_data;
183 static av_cold int vble_decode_init(AVCodecContext *avctx)
185 VBLEContext *ctx = avctx->priv_data;
187 /* Stash for later use */
189 ff_huffyuvdsp_init(&ctx->hdsp);
191 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
192 avctx->bits_per_raw_sample = 8;
194 ctx->size = av_image_get_buffer_size(avctx->pix_fmt,
195 avctx->width, avctx->height, 1);
197 ctx->val = av_malloc_array(ctx->size, sizeof(*ctx->val));
200 av_log(avctx, AV_LOG_ERROR, "Could not allocate values buffer.\n");
201 vble_decode_close(avctx);
202 return AVERROR(ENOMEM);
208 AVCodec ff_vble_decoder = {
210 .long_name = NULL_IF_CONFIG_SMALL("VBLE Lossless Codec"),
211 .type = AVMEDIA_TYPE_VIDEO,
212 .id = AV_CODEC_ID_VBLE,
213 .priv_data_size = sizeof(VBLEContext),
214 .init = vble_decode_init,
215 .close = vble_decode_close,
216 .decode = vble_decode_frame,
217 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
218 .init_thread_copy = ONLY_IF_THREADS_ENABLED(vble_decode_init),