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This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*
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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 "codec_internal.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, AVFrame *p,
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int *got_frame, 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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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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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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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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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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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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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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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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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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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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const FFCodec ff_xl_decoder = {
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.p.name = "xl",
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.p.long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_VIXL,
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.init = decode_init,
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FF_CODEC_DECODE_CB(decode_frame),
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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