mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-22 01:05:05 +02:00
175 lines
5.0 KiB
C
175 lines
5.0 KiB
C
/*
|
|
* Cirrus Logic AccuPak (CLJR) codec
|
|
* Copyright (c) 2003 Alex Beregszaszi
|
|
*
|
|
* 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
|
|
* Cirrus Logic AccuPak codec.
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
#include "put_bits.h"
|
|
|
|
typedef struct CLJRContext {
|
|
AVFrame picture;
|
|
} CLJRContext;
|
|
|
|
static av_cold int common_init(AVCodecContext *avctx)
|
|
{
|
|
CLJRContext * const a = avctx->priv_data;
|
|
|
|
avctx->coded_frame = &a->picture;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_CLJR_DECODER
|
|
static int decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
CLJRContext * const a = avctx->priv_data;
|
|
GetBitContext gb;
|
|
AVFrame *picture = data;
|
|
AVFrame * const p = &a->picture;
|
|
int x, y;
|
|
|
|
if (p->data[0])
|
|
avctx->release_buffer(avctx, p);
|
|
|
|
if (avctx->height <= 0 || avctx->width <= 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (buf_size < avctx->height * avctx->width) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Resolution larger than buffer size. Invalid header?\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
p->reference = 0;
|
|
if (avctx->get_buffer(avctx, p) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
p->key_frame = 1;
|
|
|
|
init_get_bits(&gb, buf, buf_size * 8);
|
|
|
|
for (y = 0; y < avctx->height; y++) {
|
|
uint8_t *luma = &a->picture.data[0][y * a->picture.linesize[0]];
|
|
uint8_t *cb = &a->picture.data[1][y * a->picture.linesize[1]];
|
|
uint8_t *cr = &a->picture.data[2][y * a->picture.linesize[2]];
|
|
for (x = 0; x < avctx->width; x += 4) {
|
|
luma[3] = get_bits(&gb, 5) << 3;
|
|
luma[2] = get_bits(&gb, 5) << 3;
|
|
luma[1] = get_bits(&gb, 5) << 3;
|
|
luma[0] = get_bits(&gb, 5) << 3;
|
|
luma += 4;
|
|
*(cb++) = get_bits(&gb, 6) << 2;
|
|
*(cr++) = get_bits(&gb, 6) << 2;
|
|
}
|
|
}
|
|
|
|
*picture = a->picture;
|
|
*data_size = sizeof(AVPicture);
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
avctx->pix_fmt = PIX_FMT_YUV411P;
|
|
return common_init(avctx);
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
CLJRContext *a = avctx->priv_data;
|
|
|
|
if (a->picture.data[0])
|
|
avctx->release_buffer(avctx, &a->picture);
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_cljr_decoder = {
|
|
.name = "cljr",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = CODEC_ID_CLJR,
|
|
.priv_data_size = sizeof(CLJRContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_CLJR_ENCODER
|
|
static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
|
|
int buf_size, void *data)
|
|
{
|
|
PutBitContext pb;
|
|
AVFrame *p = data;
|
|
int x, y;
|
|
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
p->key_frame = 1;
|
|
|
|
init_put_bits(&pb, buf, buf_size / 8);
|
|
|
|
for (y = 0; y < avctx->height; y++) {
|
|
uint8_t *luma = &p->data[0][y * p->linesize[0]];
|
|
uint8_t *cb = &p->data[1][y * p->linesize[1]];
|
|
uint8_t *cr = &p->data[2][y * p->linesize[2]];
|
|
for (x = 0; x < avctx->width; x += 4) {
|
|
put_bits(&pb, 5, luma[3] >> 3);
|
|
put_bits(&pb, 5, luma[2] >> 3);
|
|
put_bits(&pb, 5, luma[1] >> 3);
|
|
put_bits(&pb, 5, luma[0] >> 3);
|
|
luma += 4;
|
|
put_bits(&pb, 6, *(cb++) >> 2);
|
|
put_bits(&pb, 6, *(cr++) >> 2);
|
|
}
|
|
}
|
|
|
|
flush_put_bits(&pb);
|
|
|
|
return put_bits_count(&pb) / 8;
|
|
}
|
|
|
|
AVCodec ff_cljr_encoder = {
|
|
.name = "cljr",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = CODEC_ID_CLJR,
|
|
.priv_data_size = sizeof(CLJRContext),
|
|
.init = common_init,
|
|
.encode = encode_frame,
|
|
.pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
|
|
PIX_FMT_NONE },
|
|
.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
|
|
};
|
|
#endif
|