mirror of https://git.ffmpeg.org/ffmpeg.git
244 lines
7.3 KiB
C
244 lines
7.3 KiB
C
/*
|
|
* Intel Indeo 2 codec
|
|
* Copyright (c) 2005 Konstantin Shishkov
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Intel Indeo 2 decoder.
|
|
*/
|
|
#define BITSTREAM_READER_LE
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
#include "indeo2data.h"
|
|
#include "libavutil/common.h"
|
|
|
|
typedef struct Ir2Context{
|
|
AVCodecContext *avctx;
|
|
AVFrame picture;
|
|
GetBitContext gb;
|
|
int decode_delta;
|
|
} Ir2Context;
|
|
|
|
#define CODE_VLC_BITS 14
|
|
static VLC ir2_vlc;
|
|
|
|
/* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */
|
|
static inline int ir2_get_code(GetBitContext *gb)
|
|
{
|
|
return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1;
|
|
}
|
|
|
|
static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
|
|
const uint8_t *table)
|
|
{
|
|
int i;
|
|
int j;
|
|
int out = 0;
|
|
int c;
|
|
int t;
|
|
|
|
if(width&1)
|
|
return -1;
|
|
|
|
/* first line contain absolute values, other lines contain deltas */
|
|
while (out < width){
|
|
c = ir2_get_code(&ctx->gb);
|
|
if(c >= 0x80) { /* we have a run */
|
|
c -= 0x7F;
|
|
if(out + c*2 > width)
|
|
return -1;
|
|
for (i = 0; i < c * 2; i++)
|
|
dst[out++] = 0x80;
|
|
} else { /* copy two values from table */
|
|
dst[out++] = table[c * 2];
|
|
dst[out++] = table[(c * 2) + 1];
|
|
}
|
|
}
|
|
dst += stride;
|
|
|
|
for (j = 1; j < height; j++){
|
|
out = 0;
|
|
while (out < width){
|
|
c = ir2_get_code(&ctx->gb);
|
|
if(c >= 0x80) { /* we have a skip */
|
|
c -= 0x7F;
|
|
if(out + c*2 > width)
|
|
return -1;
|
|
for (i = 0; i < c * 2; i++) {
|
|
dst[out] = dst[out - stride];
|
|
out++;
|
|
}
|
|
} else { /* add two deltas from table */
|
|
t = dst[out - stride] + (table[c * 2] - 128);
|
|
t= av_clip_uint8(t);
|
|
dst[out] = t;
|
|
out++;
|
|
t = dst[out - stride] + (table[(c * 2) + 1] - 128);
|
|
t= av_clip_uint8(t);
|
|
dst[out] = t;
|
|
out++;
|
|
}
|
|
}
|
|
dst += stride;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride,
|
|
const uint8_t *table)
|
|
{
|
|
int j;
|
|
int out = 0;
|
|
int c;
|
|
int t;
|
|
|
|
if(width&1)
|
|
return -1;
|
|
|
|
for (j = 0; j < height; j++){
|
|
out = 0;
|
|
while (out < width){
|
|
c = ir2_get_code(&ctx->gb);
|
|
if(c >= 0x80) { /* we have a skip */
|
|
c -= 0x7F;
|
|
out += c * 2;
|
|
} else { /* add two deltas from table */
|
|
t = dst[out] + (((table[c * 2] - 128)*3) >> 2);
|
|
t= av_clip_uint8(t);
|
|
dst[out] = t;
|
|
out++;
|
|
t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2);
|
|
t= av_clip_uint8(t);
|
|
dst[out] = t;
|
|
out++;
|
|
}
|
|
}
|
|
dst += stride;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ir2_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
Ir2Context * const s = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
AVFrame * const p = &s->picture;
|
|
int start;
|
|
|
|
if(p->data[0])
|
|
avctx->release_buffer(avctx, p);
|
|
|
|
p->reference = 1;
|
|
p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
|
|
if (avctx->reget_buffer(avctx, p)) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
start = 48; /* hardcoded for now */
|
|
|
|
if (start >= buf_size) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
s->decode_delta = buf[18];
|
|
|
|
/* decide whether frame uses deltas or not */
|
|
#ifndef BITSTREAM_READER_LE
|
|
for (i = 0; i < buf_size; i++)
|
|
buf[i] = av_reverse[buf[i]];
|
|
#endif
|
|
|
|
init_get_bits(&s->gb, buf + start, (buf_size - start) * 8);
|
|
|
|
if (s->decode_delta) { /* intraframe */
|
|
ir2_decode_plane(s, avctx->width, avctx->height,
|
|
s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
|
|
/* swapped U and V */
|
|
ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
|
|
s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
|
|
ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
|
|
s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
|
|
} else { /* interframe */
|
|
ir2_decode_plane_inter(s, avctx->width, avctx->height,
|
|
s->picture.data[0], s->picture.linesize[0], ir2_luma_table);
|
|
/* swapped U and V */
|
|
ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
|
|
s->picture.data[2], s->picture.linesize[2], ir2_luma_table);
|
|
ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
|
|
s->picture.data[1], s->picture.linesize[1], ir2_luma_table);
|
|
}
|
|
|
|
*picture = s->picture;
|
|
*data_size = sizeof(AVPicture);
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int ir2_decode_init(AVCodecContext *avctx){
|
|
Ir2Context * const ic = avctx->priv_data;
|
|
static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2];
|
|
|
|
ic->avctx = avctx;
|
|
|
|
avctx->pix_fmt= PIX_FMT_YUV410P;
|
|
|
|
ir2_vlc.table = vlc_tables;
|
|
ir2_vlc.table_allocated = 1 << CODE_VLC_BITS;
|
|
#ifdef BITSTREAM_READER_LE
|
|
init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
|
|
&ir2_codes[0][1], 4, 2,
|
|
&ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
|
|
#else
|
|
init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES,
|
|
&ir2_codes[0][1], 4, 2,
|
|
&ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int ir2_decode_end(AVCodecContext *avctx){
|
|
Ir2Context * const ic = avctx->priv_data;
|
|
AVFrame *pic = &ic->picture;
|
|
|
|
if (pic->data[0])
|
|
avctx->release_buffer(avctx, pic);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_indeo2_decoder = {
|
|
.name = "indeo2",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_INDEO2,
|
|
.priv_data_size = sizeof(Ir2Context),
|
|
.init = ir2_decode_init,
|
|
.close = ir2_decode_end,
|
|
.decode = ir2_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"),
|
|
};
|