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/* |
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* ATI VCR1 codec |
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* Copyright (c) 2003 Michael Niedermayer |
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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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* ATI VCR1 codec |
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*/ |
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#include "avcodec.h" |
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#include "internal.h" |
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#include "libavutil/avassert.h" |
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#include "libavutil/internal.h" |
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typedef struct VCR1Context { |
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int delta[16]; |
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int offset[4]; |
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} VCR1Context; |
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static av_cold int vcr1_decode_init(AVCodecContext *avctx) |
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{ |
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avctx->pix_fmt = AV_PIX_FMT_YUV410P; |
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✓✗✗✓
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if (avctx->width % 8 || avctx->height%4) { |
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avpriv_request_sample(avctx, "odd dimensions (%d x %d) support", avctx->width, avctx->height); |
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return AVERROR_INVALIDDATA; |
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} |
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return 0; |
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} |
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static int vcr1_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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VCR1Context *const a = avctx->priv_data; |
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AVFrame *const p = data; |
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const uint8_t *bytestream = avpkt->data; |
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const uint8_t *bytestream_end = bytestream + avpkt->size; |
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int i, x, y, ret; |
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✗✓ |
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if(avpkt->size < 32 + avctx->height + avctx->width*avctx->height*5/8){ |
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av_log(avctx, AV_LOG_ERROR, "Insufficient input data. %d < %d\n", avpkt->size , 32 + avctx->height + avctx->width*avctx->height*5/8); |
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return AVERROR(EINVAL); |
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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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✓✓ |
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for (i = 0; i < 16; i++) { |
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a->delta[i] = *bytestream++; |
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bytestream++; |
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} |
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✓✓ |
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for (y = 0; y < avctx->height; y++) { |
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int offset; |
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uint8_t *luma = &p->data[0][y * p->linesize[0]]; |
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✓✓ |
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if ((y & 3) == 0) { |
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uint8_t *cb = &p->data[1][(y >> 2) * p->linesize[1]]; |
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uint8_t *cr = &p->data[2][(y >> 2) * p->linesize[2]]; |
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✗✓ |
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av_assert0 (bytestream_end - bytestream >= 4 + avctx->width); |
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✓✓ |
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for (i = 0; i < 4; i++) |
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a->offset[i] = *bytestream++; |
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offset = a->offset[0] - a->delta[bytestream[2] & 0xF]; |
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✓✓ |
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for (x = 0; x < avctx->width; x += 4) { |
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luma[0] = offset += a->delta[bytestream[2] & 0xF]; |
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luma[1] = offset += a->delta[bytestream[2] >> 4]; |
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luma[2] = offset += a->delta[bytestream[0] & 0xF]; |
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luma[3] = offset += a->delta[bytestream[0] >> 4]; |
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luma += 4; |
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*cb++ = bytestream[3]; |
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*cr++ = bytestream[1]; |
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bytestream += 4; |
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} |
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} else { |
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✗✓ |
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av_assert0 (bytestream_end - bytestream >= avctx->width / 2); |
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offset = a->offset[y & 3] - a->delta[bytestream[2] & 0xF]; |
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✓✓ |
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for (x = 0; x < avctx->width; x += 8) { |
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luma[0] = offset += a->delta[bytestream[2] & 0xF]; |
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luma[1] = offset += a->delta[bytestream[2] >> 4]; |
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luma[2] = offset += a->delta[bytestream[3] & 0xF]; |
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luma[3] = offset += a->delta[bytestream[3] >> 4]; |
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luma[4] = offset += a->delta[bytestream[0] & 0xF]; |
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luma[5] = offset += a->delta[bytestream[0] >> 4]; |
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luma[6] = offset += a->delta[bytestream[1] & 0xF]; |
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luma[7] = offset += a->delta[bytestream[1] >> 4]; |
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luma += 8; |
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bytestream += 4; |
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} |
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} |
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} |
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*got_frame = 1; |
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return bytestream - avpkt->data; |
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} |
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AVCodec ff_vcr1_decoder = { |
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.name = "vcr1", |
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.long_name = NULL_IF_CONFIG_SMALL("ATI VCR1"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_VCR1, |
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.priv_data_size = sizeof(VCR1Context), |
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.init = vcr1_decode_init, |
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.decode = vcr1_decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |