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4243da4ff4
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>
118 lines
4.2 KiB
C
118 lines
4.2 KiB
C
/*
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* Copyright (c) 2016 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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#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 av_cold int m101_decode_init(AVCodecContext *avctx)
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{
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if (avctx->extradata_size < 6*4) {
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avpriv_request_sample(avctx, "Missing or too small extradata (size %d)", avctx->extradata_size);
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return AVERROR_INVALIDDATA;
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}
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if (avctx->extradata[2*4] == 10)
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avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
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else if (avctx->extradata[2*4] == 8) {
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avctx->pix_fmt = AV_PIX_FMT_YUYV422;
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} else {
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avpriv_request_sample(avctx, "BPS %d", avctx->extradata[2*4]);
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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 m101_decode_frame(AVCodecContext *avctx, AVFrame *frame,
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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 stride, ret;
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int x, y;
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int min_stride = 2 * avctx->width;
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int bits = avctx->extradata[2*4];
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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stride = AV_RL32(avctx->extradata + 5*4);
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if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
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min_stride = (avctx->width + 15) / 16 * 40;
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if (stride < min_stride || avpkt->size < stride * (uint64_t)avctx->height) {
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av_log(avctx, AV_LOG_ERROR, "stride (%d) is invalid for packet sized %d\n",
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stride, avpkt->size);
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return AVERROR_INVALIDDATA;
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}
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frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3);
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if (frame->interlaced_frame)
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frame->top_field_first = avctx->extradata[3*4] & 1;
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for (y = 0; y < avctx->height; y++) {
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int src_y = y;
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if (frame->interlaced_frame)
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src_y = ((y&1)^frame->top_field_first) ? y/2 : (y/2 + avctx->height/2);
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if (bits == 8) {
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uint8_t *line = frame->data[0] + y*frame->linesize[0];
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memcpy(line, buf + src_y*stride, 2*avctx->width);
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} else {
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int block;
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uint16_t *luma = (uint16_t*)&frame->data[0][y*frame->linesize[0]];
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uint16_t *cb = (uint16_t*)&frame->data[1][y*frame->linesize[1]];
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uint16_t *cr = (uint16_t*)&frame->data[2][y*frame->linesize[2]];
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for (block = 0; 16*block < avctx->width; block ++) {
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const uint8_t *buf_src = buf + src_y*stride + 40*block;
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for (x = 0; x < 16 && x + 16*block < avctx->width; x++) {
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int xd = x + 16*block;
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if (x&1) {
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luma [xd] = (4*buf_src[2*x + 0]) + ((buf_src[32 + (x>>1)]>>4)&3);
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} else {
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luma [xd] = (4*buf_src[2*x + 0]) + (buf_src[32 + (x>>1)] &3);
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cb[xd>>1] = (4*buf_src[2*x + 1]) + ((buf_src[32 + (x>>1)]>>2)&3);
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cr[xd>>1] = (4*buf_src[2*x + 3]) + (buf_src[32 + (x>>1)]>>6);
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}
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}
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}
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}
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}
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*got_frame = 1;
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return avpkt->size;
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}
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const FFCodec ff_m101_decoder = {
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.p.name = "m101",
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.p.long_name = NULL_IF_CONFIG_SMALL("Matrox Uncompressed SD"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_M101,
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.init = m101_decode_init,
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FF_CODEC_DECODE_CB(m101_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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