mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-26 17:32:06 +00:00
05577d2c76
Everything besides VLC.table is basically write-only and even VLC.table can be removed by accessing the underlying table directly. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
272 lines
8.2 KiB
C
272 lines
8.2 KiB
C
/*
|
|
* Intel Indeo 2 codec
|
|
* Copyright (c) 2005 Konstantin Shishkov
|
|
*
|
|
* 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
|
|
* Intel Indeo 2 decoder.
|
|
*/
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/thread.h"
|
|
|
|
#define BITSTREAM_READER_LE
|
|
#include "avcodec.h"
|
|
#include "codec_internal.h"
|
|
#include "decode.h"
|
|
#include "get_bits.h"
|
|
#include "indeo2data.h"
|
|
|
|
typedef struct Ir2Context{
|
|
AVCodecContext *avctx;
|
|
AVFrame *picture;
|
|
GetBitContext gb;
|
|
int decode_delta;
|
|
} Ir2Context;
|
|
|
|
#define CODE_VLC_BITS 14
|
|
static VLCElem ir2_vlc[1 << CODE_VLC_BITS];
|
|
|
|
/* 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, CODE_VLC_BITS, 1);
|
|
}
|
|
|
|
static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst,
|
|
int pitch, const uint8_t *table)
|
|
{
|
|
int i;
|
|
int j;
|
|
int out = 0;
|
|
|
|
if ((width & 1) || width * height / (2*(IR2_CODES - 0x7F)) > get_bits_left(&ctx->gb))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* first line contain absolute values, other lines contain deltas */
|
|
while (out < width) {
|
|
int c = ir2_get_code(&ctx->gb);
|
|
if (c >= 0x80) { /* we have a run */
|
|
c -= 0x7F;
|
|
if (out + c*2 > width)
|
|
return AVERROR_INVALIDDATA;
|
|
for (i = 0; i < c * 2; i++)
|
|
dst[out++] = 0x80;
|
|
} else { /* copy two values from table */
|
|
if (c <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
dst[out++] = table[c * 2];
|
|
dst[out++] = table[(c * 2) + 1];
|
|
}
|
|
}
|
|
dst += pitch;
|
|
|
|
for (j = 1; j < height; j++) {
|
|
out = 0;
|
|
while (out < width) {
|
|
int c;
|
|
if (get_bits_left(&ctx->gb) <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
c = ir2_get_code(&ctx->gb);
|
|
if (c >= 0x80) { /* we have a skip */
|
|
c -= 0x7F;
|
|
if (out + c*2 > width)
|
|
return AVERROR_INVALIDDATA;
|
|
for (i = 0; i < c * 2; i++) {
|
|
dst[out] = dst[out - pitch];
|
|
out++;
|
|
}
|
|
} else { /* add two deltas from table */
|
|
int t;
|
|
if (c <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
t = dst[out - pitch] + (table[c * 2] - 128);
|
|
t = av_clip_uint8(t);
|
|
dst[out] = t;
|
|
out++;
|
|
t = dst[out - pitch] + (table[(c * 2) + 1] - 128);
|
|
t = av_clip_uint8(t);
|
|
dst[out] = t;
|
|
out++;
|
|
}
|
|
}
|
|
dst += pitch;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst,
|
|
int pitch, const uint8_t *table)
|
|
{
|
|
int j;
|
|
int out = 0;
|
|
int c;
|
|
int t;
|
|
|
|
if (width & 1)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
for (j = 0; j < height; j++) {
|
|
out = 0;
|
|
while (out < width) {
|
|
if (get_bits_left(&ctx->gb) <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
c = ir2_get_code(&ctx->gb);
|
|
if (c >= 0x80) { /* we have a skip */
|
|
c -= 0x7F;
|
|
out += c * 2;
|
|
} else { /* add two deltas from table */
|
|
if (c <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
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 += pitch;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ir2_decode_frame(AVCodecContext *avctx, AVFrame *picture,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
Ir2Context * const s = avctx->priv_data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
AVFrame * const p = s->picture;
|
|
int start, ret;
|
|
int ltab, ctab;
|
|
|
|
if ((ret = ff_reget_buffer(avctx, p, 0)) < 0)
|
|
return ret;
|
|
|
|
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 */
|
|
|
|
if ((ret = init_get_bits8(&s->gb, buf + start, buf_size - start)) < 0)
|
|
return ret;
|
|
|
|
ltab = buf[0x22] & 3;
|
|
ctab = buf[0x22] >> 2;
|
|
|
|
if (ctab > 3) {
|
|
av_log(avctx, AV_LOG_ERROR, "ctab %d is invalid\n", ctab);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (s->decode_delta) { /* intraframe */
|
|
if ((ret = ir2_decode_plane(s, avctx->width, avctx->height,
|
|
p->data[0], p->linesize[0],
|
|
ir2_delta_table[ltab])) < 0)
|
|
return ret;
|
|
|
|
/* swapped U and V */
|
|
if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
|
|
p->data[2], p->linesize[2],
|
|
ir2_delta_table[ctab])) < 0)
|
|
return ret;
|
|
if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2,
|
|
p->data[1], p->linesize[1],
|
|
ir2_delta_table[ctab])) < 0)
|
|
return ret;
|
|
} else { /* interframe */
|
|
if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height,
|
|
p->data[0], p->linesize[0],
|
|
ir2_delta_table[ltab])) < 0)
|
|
return ret;
|
|
/* swapped U and V */
|
|
if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
|
|
p->data[2], p->linesize[2],
|
|
ir2_delta_table[ctab])) < 0)
|
|
return ret;
|
|
if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2,
|
|
p->data[1], p->linesize[1],
|
|
ir2_delta_table[ctab])) < 0)
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = av_frame_ref(picture, p)) < 0)
|
|
return ret;
|
|
|
|
*got_frame = 1;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold void ir2_init_static(void)
|
|
{
|
|
VLC_INIT_STATIC_TABLE_FROM_LENGTHS(ir2_vlc, CODE_VLC_BITS, IR2_CODES,
|
|
&ir2_tab[0][1], 2, &ir2_tab[0][0], 2, 1,
|
|
0, VLC_INIT_OUTPUT_LE);
|
|
}
|
|
|
|
static av_cold int ir2_decode_init(AVCodecContext *avctx)
|
|
{
|
|
static AVOnce init_static_once = AV_ONCE_INIT;
|
|
Ir2Context * const ic = avctx->priv_data;
|
|
|
|
ic->avctx = avctx;
|
|
|
|
avctx->pix_fmt= AV_PIX_FMT_YUV410P;
|
|
|
|
ic->picture = av_frame_alloc();
|
|
if (!ic->picture)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ff_thread_once(&init_static_once, ir2_init_static);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int ir2_decode_end(AVCodecContext *avctx)
|
|
{
|
|
Ir2Context * const ic = avctx->priv_data;
|
|
|
|
av_frame_free(&ic->picture);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFCodec ff_indeo2_decoder = {
|
|
.p.name = "indeo2",
|
|
CODEC_LONG_NAME("Intel Indeo 2"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_INDEO2,
|
|
.priv_data_size = sizeof(Ir2Context),
|
|
.init = ir2_decode_init,
|
|
.close = ir2_decode_end,
|
|
FF_CODEC_DECODE_CB(ir2_decode_frame),
|
|
.p.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|