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164 lines
4.3 KiB
164 lines
4.3 KiB
/* |
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* Cirrus Logic AccuPak (CLJR) codec |
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* Copyright (c) 2003 Alex Beregszaszi |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Cirrus Logic AccuPak codec. |
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*/ |
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "get_bits.h" |
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/* Disable the encoder. */ |
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#undef CONFIG_CLJR_ENCODER |
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#define CONFIG_CLJR_ENCODER 0 |
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typedef struct CLJRContext{ |
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AVCodecContext *avctx; |
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AVFrame picture; |
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int delta[16]; |
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int offset[4]; |
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GetBitContext gb; |
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} CLJRContext; |
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static int decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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CLJRContext * const a = avctx->priv_data; |
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AVFrame *picture = data; |
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AVFrame * const p= (AVFrame*)&a->picture; |
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int x, y; |
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if(p->data[0]) |
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avctx->release_buffer(avctx, p); |
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if(buf_size/avctx->height < avctx->width) { |
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av_log(avctx, AV_LOG_ERROR, "Resolution larger than buffer size. Invalid header?\n"); |
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return -1; |
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} |
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p->reference= 0; |
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if(avctx->get_buffer(avctx, p) < 0){ |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return -1; |
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} |
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p->pict_type= AV_PICTURE_TYPE_I; |
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p->key_frame= 1; |
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init_get_bits(&a->gb, buf, buf_size); |
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for(y=0; y<avctx->height; y++){ |
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uint8_t *luma= &a->picture.data[0][ y*a->picture.linesize[0] ]; |
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uint8_t *cb= &a->picture.data[1][ y*a->picture.linesize[1] ]; |
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uint8_t *cr= &a->picture.data[2][ y*a->picture.linesize[2] ]; |
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for(x=0; x<avctx->width; x+=4){ |
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luma[3] = get_bits(&a->gb, 5) << 3; |
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luma[2] = get_bits(&a->gb, 5) << 3; |
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luma[1] = get_bits(&a->gb, 5) << 3; |
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luma[0] = get_bits(&a->gb, 5) << 3; |
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luma+= 4; |
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*(cb++) = get_bits(&a->gb, 6) << 2; |
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*(cr++) = get_bits(&a->gb, 6) << 2; |
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} |
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} |
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*picture= *(AVFrame*)&a->picture; |
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*data_size = sizeof(AVPicture); |
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emms_c(); |
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return buf_size; |
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} |
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#if CONFIG_CLJR_ENCODER |
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static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ |
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CLJRContext * const a = avctx->priv_data; |
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AVFrame *pict = data; |
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AVFrame * const p= (AVFrame*)&a->picture; |
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int size; |
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*p = *pict; |
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p->pict_type= AV_PICTURE_TYPE_I; |
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p->key_frame= 1; |
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emms_c(); |
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align_put_bits(&a->pb); |
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while(get_bit_count(&a->pb)&31) |
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put_bits(&a->pb, 8, 0); |
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size= get_bit_count(&a->pb)/32; |
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return size*4; |
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} |
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#endif |
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static av_cold void common_init(AVCodecContext *avctx){ |
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CLJRContext * const a = avctx->priv_data; |
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avctx->coded_frame= (AVFrame*)&a->picture; |
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a->avctx= avctx; |
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} |
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static av_cold int decode_init(AVCodecContext *avctx){ |
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common_init(avctx); |
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avctx->pix_fmt= PIX_FMT_YUV411P; |
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return 0; |
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} |
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#if CONFIG_CLJR_ENCODER |
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static av_cold int encode_init(AVCodecContext *avctx){ |
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common_init(avctx); |
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return 0; |
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} |
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#endif |
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AVCodec ff_cljr_decoder = { |
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.name = "cljr", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = CODEC_ID_CLJR, |
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.priv_data_size = sizeof(CLJRContext), |
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.init = decode_init, |
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.decode = decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), |
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}; |
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#if CONFIG_CLJR_ENCODER |
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AVCodec ff_cljr_encoder = { |
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.name = "cljr", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = CODEC_ID_CLJR, |
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.priv_data_size = sizeof(CLJRContext), |
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.init = encode_init, |
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.encode = encode_frame, |
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.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), |
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}; |
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#endif
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