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/* |
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* Cirrus Logic AccuPak (CLJR) decoder |
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* Copyright (c) 2003 Alex Beregszaszi |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 decoder. |
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*/ |
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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "internal.h" |
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static int decode_frame(AVCodecContext *avctx, |
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void *data, int *got_frame, |
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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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GetBitContext gb; |
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AVFrame * const p = data; |
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int x, y, ret; |
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✓✗✗✓
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if (avctx->height <= 0 || avctx->width <= 0) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid width or height\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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✓✓ |
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if (buf_size / avctx->height < avctx->width) { |
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av_log(avctx, AV_LOG_ERROR, |
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"Resolution larger than buffer size. Invalid header?\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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✗✓ |
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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return ret; |
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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(&gb, buf, buf_size * 8); |
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✓✓ |
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for (y = 0; y < avctx->height; y++) { |
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uint8_t *luma = &p->data[0][y * p->linesize[0]]; |
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uint8_t *cb = &p->data[1][y * p->linesize[1]]; |
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uint8_t *cr = &p->data[2][y * p->linesize[2]]; |
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✓✓ |
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for (x = 0; x < avctx->width; x += 4) { |
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luma[3] = (get_bits(&gb, 5)*33) >> 2; |
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luma[2] = (get_bits(&gb, 5)*33) >> 2; |
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luma[1] = (get_bits(&gb, 5)*33) >> 2; |
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luma[0] = (get_bits(&gb, 5)*33) >> 2; |
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luma += 4; |
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*(cb++) = get_bits(&gb, 6) << 2; |
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*(cr++) = get_bits(&gb, 6) << 2; |
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} |
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} |
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*got_frame = 1; |
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return buf_size; |
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} |
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static av_cold int decode_init(AVCodecContext *avctx) |
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{ |
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avctx->pix_fmt = AV_PIX_FMT_YUV411P; |
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return 0; |
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} |
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AVCodec ff_cljr_decoder = { |
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.name = "cljr", |
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.long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_CLJR, |
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.init = decode_init, |
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.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |
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