mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-21 16:55:05 +02:00
![Clément Bœsch](/assets/img/avatar_default.png)
Coccinelle profile used: @@ expression r, ctx, f, loglevel, str, flags; @@ -if ((r = ff_get_buffer(ctx, f, flags)) < 0) { - av_log(ctx, loglevel, str); - return r; -} +if ((r = ff_get_buffer(ctx, f, flags)) < 0) + return r; @@ expression r, ctx, f, loglevel, str; @@ -if ((r = ff_reget_buffer(ctx, f)) < 0) { - av_log(ctx, loglevel, str); - return r; -} +if ((r = ff_reget_buffer(ctx, f)) < 0) + return r; @@ expression r, ctx, f, loglevel, str, flags; @@ -if ((r = ff_thread_get_buffer(ctx, f, flags)) < 0) { - av_log(ctx, loglevel, str); - return r; -} +if ((r = ff_thread_get_buffer(ctx, f, flags)) < 0) + return r; ...along with some manual patches for the remaining ones.
214 lines
6.2 KiB
C
214 lines
6.2 KiB
C
/*
|
|
* 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"),
|
|
};
|