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/* |
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* Miro VideoXL codec |
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* Copyright (c) 2004 Konstantin Shishkov |
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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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* Miro VideoXL codec. |
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*/ |
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#include "libavutil/common.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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static const int xl_table[32] = { |
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0, 1, 2, 3, 4, 5, 6, 7, |
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8, 9, 12, 15, 20, 25, 34, 46, |
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64, 82, 94, 103, 108, 113, 116, 119, |
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120, 121, 122, 123, 124, 125, 126, 127 |
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}; |
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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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AVFrame *const p = data; |
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uint8_t *Y, *U, *V; |
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int i, j, ret; |
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int stride; |
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uint32_t val; |
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int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0; |
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✗✓ |
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if (avctx->width % 4) { |
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av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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✗✓ |
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if (buf_size < avctx->width * avctx->height) { |
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av_log(avctx, AV_LOG_ERROR, "Packet is too small\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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Y = p->data[0]; |
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U = p->data[1]; |
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V = p->data[2]; |
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stride = avctx->width - 4; |
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✓✓ |
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for (i = 0; i < avctx->height; i++) { |
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/* lines are stored in reversed order */ |
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buf += stride; |
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✓✓ |
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for (j = 0; j < avctx->width; j += 4) { |
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/* value is stored in LE dword with word swapped */ |
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val = AV_RL32(buf); |
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buf -= 4; |
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val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16); |
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✓✓ |
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if (!j) |
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y0 = (val & 0x1F) << 2; |
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else |
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y0 = y3 + xl_table[val & 0x1F]; |
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val >>= 5; |
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y1 = y0 + xl_table[val & 0x1F]; |
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val >>= 5; |
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y2 = y1 + xl_table[val & 0x1F]; |
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val >>= 6; /* align to word */ |
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y3 = y2 + xl_table[val & 0x1F]; |
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val >>= 5; |
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✓✓ |
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if (!j) |
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c0 = (val & 0x1F) << 2; |
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else |
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c0 += xl_table[val & 0x1F]; |
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val >>= 5; |
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✓✓ |
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if (!j) |
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c1 = (val & 0x1F) << 2; |
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else |
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c1 += xl_table[val & 0x1F]; |
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Y[j + 0] = y0 << 1; |
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Y[j + 1] = y1 << 1; |
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Y[j + 2] = y2 << 1; |
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Y[j + 3] = y3 << 1; |
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U[j >> 2] = c0 << 1; |
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V[j >> 2] = c1 << 1; |
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} |
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buf += avctx->width + 4; |
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Y += p->linesize[0]; |
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U += p->linesize[1]; |
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V += p->linesize[2]; |
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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_xl_decoder = { |
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.name = "xl", |
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.long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_VIXL, |
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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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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, |
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}; |