mirror of https://github.com/FFmpeg/FFmpeg.git
Some fixes provided by Paul B Mahol <onemda@gmail.com> and Michael Niedermayer <michaelni@gmx.at> and me. Signed-off-by: Diego Biurrun <diego@biurrun.de> Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>pull/18/head
parent
cebdedca57
commit
350914fc80
9 changed files with 369 additions and 3 deletions
@ -0,0 +1,356 @@ |
||||
/*
|
||||
* Escape 130 video decoder |
||||
* Copyright (C) 2008 Eli Friedman (eli.friedman <at> gmail.com) |
||||
* |
||||
* This file is part of Libav. |
||||
* |
||||
* Libav 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. |
||||
* |
||||
* Libav 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 Libav; if not, write to the Free Software |
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
||||
*/ |
||||
|
||||
#include "libavutil/attributes.h" |
||||
#include "libavutil/mem.h" |
||||
#include "avcodec.h" |
||||
#define BITSTREAM_READER_LE |
||||
#include "get_bits.h" |
||||
#include "internal.h" |
||||
|
||||
typedef struct Escape130Context { |
||||
uint8_t *old_y_avg; |
||||
|
||||
uint8_t *new_y, *old_y; |
||||
uint8_t *new_u, *old_u; |
||||
uint8_t *new_v, *old_v; |
||||
|
||||
uint8_t *buf1, *buf2; |
||||
int linesize[3]; |
||||
} Escape130Context; |
||||
|
||||
static const uint8_t offset_table[] = { 2, 4, 10, 20 }; |
||||
static const int8_t sign_table[64][4] = { |
||||
{ 0, 0, 0, 0 }, |
||||
{ -1, 1, 0, 0 }, |
||||
{ 1, -1, 0, 0 }, |
||||
{ -1, 0, 1, 0 }, |
||||
{ -1, 1, 1, 0 }, |
||||
{ 0, -1, 1, 0 }, |
||||
{ 1, -1, 1, 0 }, |
||||
{ -1, -1, 1, 0 }, |
||||
{ 1, 0, -1, 0 }, |
||||
{ 0, 1, -1, 0 }, |
||||
{ 1, 1, -1, 0 }, |
||||
{ -1, 1, -1, 0 }, |
||||
{ 1, -1, -1, 0 }, |
||||
{ -1, 0, 0, 1 }, |
||||
{ -1, 1, 0, 1 }, |
||||
{ 0, -1, 0, 1 }, |
||||
|
||||
{ 0, 0, 0, 0 }, |
||||
{ 1, -1, 0, 1 }, |
||||
{ -1, -1, 0, 1 }, |
||||
{ -1, 0, 1, 1 }, |
||||
{ -1, 1, 1, 1 }, |
||||
{ 0, -1, 1, 1 }, |
||||
{ 1, -1, 1, 1 }, |
||||
{ -1, -1, 1, 1 }, |
||||
{ 0, 0, -1, 1 }, |
||||
{ 1, 0, -1, 1 }, |
||||
{ -1, 0, -1, 1 }, |
||||
{ 0, 1, -1, 1 }, |
||||
{ 1, 1, -1, 1 }, |
||||
{ -1, 1, -1, 1 }, |
||||
{ 0, -1, -1, 1 }, |
||||
{ 1, -1, -1, 1 }, |
||||
|
||||
{ 0, 0, 0, 0 }, |
||||
{ -1, -1, -1, 1 }, |
||||
{ 1, 0, 0, -1 }, |
||||
{ 0, 1, 0, -1 }, |
||||
{ 1, 1, 0, -1 }, |
||||
{ -1, 1, 0, -1 }, |
||||
{ 1, -1, 0, -1 }, |
||||
{ 0, 0, 1, -1 }, |
||||
{ 1, 0, 1, -1 }, |
||||
{ -1, 0, 1, -1 }, |
||||
{ 0, 1, 1, -1 }, |
||||
{ 1, 1, 1, -1 }, |
||||
{ -1, 1, 1, -1 }, |
||||
{ 0, -1, 1, -1 }, |
||||
{ 1, -1, 1, -1 }, |
||||
{ -1, -1, 1, -1 }, |
||||
|
||||
{ 0, 0, 0, 0 }, |
||||
{ 1, 0, -1, -1 }, |
||||
{ 0, 1, -1, -1 }, |
||||
{ 1, 1, -1, -1 }, |
||||
{ -1, 1, -1, -1 }, |
||||
{ 1, -1, -1, -1 } |
||||
}; |
||||
|
||||
static const int8_t luma_adjust[] = { -4, -3, -2, -1, 1, 2, 3, 4 }; |
||||
|
||||
static const int8_t chroma_adjust[2][8] = { |
||||
{ 1, 1, 0, -1, -1, -1, 0, 1 }, |
||||
{ 0, 1, 1, 1, 0, -1, -1, -1 } |
||||
}; |
||||
|
||||
const uint8_t chroma_vals[] = { |
||||
20, 28, 36, 44, 52, 60, 68, 76, |
||||
84, 92, 100, 106, 112, 116, 120, 124, |
||||
128, 132, 136, 140, 144, 150, 156, 164, |
||||
172, 180, 188, 196, 204, 212, 220, 228 |
||||
}; |
||||
|
||||
static av_cold int escape130_decode_init(AVCodecContext *avctx) |
||||
{ |
||||
Escape130Context *s = avctx->priv_data; |
||||
avctx->pix_fmt = PIX_FMT_YUV420P; |
||||
|
||||
if ((avctx->width & 1) || (avctx->height & 1)) { |
||||
av_log(avctx, AV_LOG_ERROR, |
||||
"Dimensions should be a multiple of two.\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
s->old_y_avg = av_malloc(avctx->width * avctx->height / 4); |
||||
s->buf1 = av_malloc(avctx->width * avctx->height * 3 / 2); |
||||
s->buf2 = av_malloc(avctx->width * avctx->height * 3 / 2); |
||||
if (!s->old_y_avg || !s->buf1 || !s->buf2) { |
||||
av_freep(&s->old_y_avg); |
||||
av_freep(&s->buf1); |
||||
av_freep(&s->buf2); |
||||
av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); |
||||
return AVERROR(ENOMEM); |
||||
} |
||||
|
||||
s->linesize[0] = avctx->width; |
||||
s->linesize[1] = |
||||
s->linesize[2] = avctx->width / 2; |
||||
|
||||
s->new_y = s->buf1; |
||||
s->new_u = s->new_y + avctx->width * avctx->height; |
||||
s->new_v = s->new_u + avctx->width * avctx->height / 4; |
||||
s->old_y = s->buf2; |
||||
s->old_u = s->old_y + avctx->width * avctx->height; |
||||
s->old_v = s->old_u + avctx->width * avctx->height / 4; |
||||
memset(s->old_y, 0, avctx->width * avctx->height); |
||||
memset(s->old_u, 0x10, avctx->width * avctx->height / 4); |
||||
memset(s->old_v, 0x10, avctx->width * avctx->height / 4); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static av_cold int escape130_decode_close(AVCodecContext *avctx) |
||||
{ |
||||
Escape130Context *s = avctx->priv_data; |
||||
|
||||
av_freep(&s->old_y_avg); |
||||
av_freep(&s->buf1); |
||||
av_freep(&s->buf2); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static int decode_skip_count(GetBitContext* gb) |
||||
{ |
||||
int value; |
||||
|
||||
value = get_bits1(gb); |
||||
if (value) |
||||
return 0; |
||||
|
||||
value = get_bits(gb, 3); |
||||
if (value) |
||||
return value; |
||||
|
||||
value = get_bits(gb, 8); |
||||
if (value) |
||||
return value + 7; |
||||
|
||||
value = get_bits(gb, 15); |
||||
if (value) |
||||
return value + 262; |
||||
|
||||
return -1; |
||||
} |
||||
|
||||
static int escape130_decode_frame(AVCodecContext *avctx, void *data, |
||||
int *got_frame, AVPacket *avpkt) |
||||
{ |
||||
const uint8_t *buf = avpkt->data; |
||||
int buf_size = avpkt->size; |
||||
Escape130Context *s = avctx->priv_data; |
||||
AVFrame *pic = data; |
||||
GetBitContext gb; |
||||
int ret; |
||||
|
||||
uint8_t *old_y, *old_cb, *old_cr, |
||||
*new_y, *new_cb, *new_cr; |
||||
uint8_t *dstY, *dstU, *dstV; |
||||
unsigned old_y_stride, old_cb_stride, old_cr_stride, |
||||
new_y_stride, new_cb_stride, new_cr_stride; |
||||
unsigned total_blocks = avctx->width * avctx->height / 4, |
||||
block_index, block_x = 0; |
||||
unsigned y[4] = { 0 }, cb = 0x10, cr = 0x10; |
||||
int skip = -1, y_avg = 0, i, j; |
||||
uint8_t *ya = s->old_y_avg; |
||||
|
||||
// first 16 bytes are header; no useful information in here
|
||||
if (buf_size <= 16) { |
||||
av_log(avctx, AV_LOG_ERROR, "Insufficient frame data\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
||||
return ret; |
||||
|
||||
init_get_bits(&gb, buf + 16, (buf_size - 16) * 8); |
||||
|
||||
new_y = s->new_y; |
||||
new_cb = s->new_u; |
||||
new_cr = s->new_v; |
||||
new_y_stride = s->linesize[0]; |
||||
new_cb_stride = s->linesize[1]; |
||||
new_cr_stride = s->linesize[2]; |
||||
old_y = s->old_y; |
||||
old_cb = s->old_u; |
||||
old_cr = s->old_v; |
||||
old_y_stride = s->linesize[0]; |
||||
old_cb_stride = s->linesize[1]; |
||||
old_cr_stride = s->linesize[2]; |
||||
|
||||
for (block_index = 0; block_index < total_blocks; block_index++) { |
||||
// Note that this call will make us skip the rest of the blocks
|
||||
// if the frame ends prematurely.
|
||||
if (skip == -1) |
||||
skip = decode_skip_count(&gb); |
||||
if (skip == -1) { |
||||
av_log(avctx, AV_LOG_ERROR, "Error decoding skip value\n"); |
||||
return AVERROR_INVALIDDATA; |
||||
} |
||||
|
||||
if (skip) { |
||||
y[0] = old_y[0]; |
||||
y[1] = old_y[1]; |
||||
y[2] = old_y[old_y_stride]; |
||||
y[3] = old_y[old_y_stride + 1]; |
||||
y_avg = ya[0]; |
||||
cb = old_cb[0]; |
||||
cr = old_cr[0]; |
||||
} else { |
||||
if (get_bits1(&gb)) { |
||||
unsigned sign_selector = get_bits(&gb, 6); |
||||
unsigned difference_selector = get_bits(&gb, 2); |
||||
y_avg = 2 * get_bits(&gb, 5); |
||||
for (i = 0; i < 4; i++) { |
||||
y[i] = av_clip(y_avg + offset_table[difference_selector] * |
||||
sign_table[sign_selector][i], 0, 63); |
||||
} |
||||
} else if (get_bits1(&gb)) { |
||||
if (get_bits1(&gb)) { |
||||
y_avg = get_bits(&gb, 6); |
||||
} else { |
||||
unsigned adjust_index = get_bits(&gb, 3); |
||||
y_avg = (y_avg + luma_adjust[adjust_index]) & 63; |
||||
} |
||||
for (i = 0; i < 4; i++) |
||||
y[i] = y_avg; |
||||
} |
||||
|
||||
if (get_bits1(&gb)) { |
||||
if (get_bits1(&gb)) { |
||||
cb = get_bits(&gb, 5); |
||||
cr = get_bits(&gb, 5); |
||||
} else { |
||||
unsigned adjust_index = get_bits(&gb, 3); |
||||
cb = (cb + chroma_adjust[0][adjust_index]) & 31; |
||||
cr = (cr + chroma_adjust[1][adjust_index]) & 31; |
||||
} |
||||
} |
||||
} |
||||
*ya++ = y_avg; |
||||
|
||||
new_y[0] = y[0]; |
||||
new_y[1] = y[1]; |
||||
new_y[new_y_stride] = y[2]; |
||||
new_y[new_y_stride + 1] = y[3]; |
||||
*new_cb = cb; |
||||
*new_cr = cr; |
||||
|
||||
old_y += 2; |
||||
old_cb++; |
||||
old_cr++; |
||||
new_y += 2; |
||||
new_cb++; |
||||
new_cr++; |
||||
block_x++; |
||||
if (block_x * 2 == avctx->width) { |
||||
block_x = 0; |
||||
old_y += old_y_stride * 2 - avctx->width; |
||||
old_cb += old_cb_stride - avctx->width / 2; |
||||
old_cr += old_cr_stride - avctx->width / 2; |
||||
new_y += new_y_stride * 2 - avctx->width; |
||||
new_cb += new_cb_stride - avctx->width / 2; |
||||
new_cr += new_cr_stride - avctx->width / 2; |
||||
} |
||||
|
||||
skip--; |
||||
} |
||||
|
||||
new_y = s->new_y; |
||||
new_cb = s->new_u; |
||||
new_cr = s->new_v; |
||||
dstY = pic->data[0]; |
||||
dstU = pic->data[1]; |
||||
dstV = pic->data[2]; |
||||
for (j = 0; j < avctx->height; j++) { |
||||
for (i = 0; i < avctx->width; i++) |
||||
dstY[i] = new_y[i] << 2; |
||||
dstY += pic->linesize[0]; |
||||
new_y += new_y_stride; |
||||
} |
||||
for (j = 0; j < avctx->height / 2; j++) { |
||||
for (i = 0; i < avctx->width / 2; i++) { |
||||
dstU[i] = chroma_vals[new_cb[i]]; |
||||
dstV[i] = chroma_vals[new_cr[i]]; |
||||
} |
||||
dstU += pic->linesize[1]; |
||||
dstV += pic->linesize[2]; |
||||
new_cb += new_cb_stride; |
||||
new_cr += new_cr_stride; |
||||
} |
||||
|
||||
av_dlog(avctx, "Frame data: provided %d bytes, used %d bytes\n", |
||||
buf_size, get_bits_count(&gb) >> 3); |
||||
|
||||
FFSWAP(uint8_t*, s->old_y, s->new_y); |
||||
FFSWAP(uint8_t*, s->old_u, s->new_u); |
||||
FFSWAP(uint8_t*, s->old_v, s->new_v); |
||||
|
||||
*got_frame = 1; |
||||
|
||||
return buf_size; |
||||
} |
||||
|
||||
AVCodec ff_escape130_decoder = { |
||||
.name = "escape130", |
||||
.type = AVMEDIA_TYPE_VIDEO, |
||||
.id = AV_CODEC_ID_ESCAPE130, |
||||
.priv_data_size = sizeof(Escape130Context), |
||||
.init = escape130_decode_init, |
||||
.close = escape130_decode_close, |
||||
.decode = escape130_decode_frame, |
||||
.capabilities = CODEC_CAP_DR1, |
||||
.long_name = NULL_IF_CONFIG_SMALL("Escape 130"), |
||||
}; |
Loading…
Reference in new issue