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20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
119 lines
4.2 KiB
C
119 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, 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 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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AVFrame *frame = data;
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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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.decode = 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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