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/* |
* 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. |
*/ |
|
#define BITSTREAM_READER_LE |
#include "libavutil/attributes.h" |
#include "avcodec.h" |
#include "get_bits.h" |
#include "indeo2data.h" |
#include "internal.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 AVERROR_INVALIDDATA; |
|
/* 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 AVERROR_INVALIDDATA; |
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 AVERROR_INVALIDDATA; |
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 AVERROR_INVALIDDATA; |
|
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) |
{ |
Ir2Context * const s = avctx->priv_data; |
const uint8_t *buf = avpkt->data; |
int buf_size = avpkt->size; |
AVFrame *picture = data; |
AVFrame * const p = s->picture; |
int start, ret; |
|
if ((ret = ff_reget_buffer(avctx, p)) < 0) |
return ret; |
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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; |
} |
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s->decode_delta = buf[18]; |
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/* 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 |
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init_get_bits(&s->gb, buf + start, (buf_size - start) * 8); |
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if (s->decode_delta) { /* intraframe */ |
if ((ret = ir2_decode_plane(s, avctx->width, avctx->height, |
s->picture->data[0], s->picture->linesize[0], |
ir2_luma_table)) < 0) |
return ret; |
|
/* swapped U and V */ |
if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, |
s->picture->data[2], s->picture->linesize[2], |
ir2_luma_table)) < 0) |
return ret; |
if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, |
s->picture->data[1], s->picture->linesize[1], |
ir2_luma_table)) < 0) |
return ret; |
} else { /* interframe */ |
if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height, |
s->picture->data[0], s->picture->linesize[0], |
ir2_luma_table)) < 0) |
return ret; |
/* swapped U and V */ |
if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, |
s->picture->data[2], s->picture->linesize[2], |
ir2_luma_table)) < 0) |
return ret; |
if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, |
s->picture->data[1], s->picture->linesize[1], |
ir2_luma_table)) < 0) |
return ret; |
} |
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if ((ret = av_frame_ref(picture, s->picture)) < 0) |
return ret; |
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*got_frame = 1; |
|
return buf_size; |
} |
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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]; |
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ic->avctx = avctx; |
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avctx->pix_fmt= AV_PIX_FMT_YUV410P; |
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ic->picture = av_frame_alloc(); |
if (!ic->picture) |
return AVERROR(ENOMEM); |
|
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; |
} |
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static av_cold int ir2_decode_end(AVCodecContext *avctx) |
{ |
Ir2Context * const ic = avctx->priv_data; |
|
av_frame_free(&ic->picture); |
|
return 0; |
} |
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AVCodec ff_indeo2_decoder = { |
.name = "indeo2", |
.long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"), |
.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, |
}; |