mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
245 lines
7.3 KiB
245 lines
7.3 KiB
/* |
|
* 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 "libavutil/attributes.h" |
|
#include "avcodec.h" |
|
#include "get_bits.h" |
|
#include "indeo2data.h" |
|
#include "mathops.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 *got_frame, |
|
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] = ff_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; |
|
*got_frame = 1; |
|
|
|
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= AV_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"), |
|
};
|
|
|