mirror of
https://github.com/FFmpeg/FFmpeg.git
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133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/*
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* V210 decoder
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*
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* Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "avcodec.h"
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#include "libavutil/bswap.h"
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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if (avctx->width & 1) {
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av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
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return -1;
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}
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avctx->pix_fmt = PIX_FMT_YUV422P16;
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avctx->bits_per_raw_sample = 10;
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avctx->coded_frame = avcodec_alloc_frame();
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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AVPacket *avpkt)
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{
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int h, w;
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AVFrame *pic = avctx->coded_frame;
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const uint8_t *psrc = avpkt->data;
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uint16_t *y, *u, *v;
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int aligned_width = ((avctx->width + 47) / 48) * 48;
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int stride = aligned_width * 8 / 3;
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if (pic->data[0])
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avctx->release_buffer(avctx, pic);
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if (avpkt->size < stride * avctx->height) {
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av_log(avctx, AV_LOG_ERROR, "packet too small\n");
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return -1;
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}
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pic->reference = 0;
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if (avctx->get_buffer(avctx, pic) < 0)
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return -1;
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y = (uint16_t*)pic->data[0];
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u = (uint16_t*)pic->data[1];
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v = (uint16_t*)pic->data[2];
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pic->pict_type = AV_PICTURE_TYPE_I;
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pic->key_frame = 1;
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#define READ_PIXELS(a, b, c) \
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do { \
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val = av_le2ne32(*src++); \
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*a++ = val << 6; \
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*b++ = (val >> 4) & 0xFFC0; \
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*c++ = (val >> 14) & 0xFFC0; \
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} while (0)
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for (h = 0; h < avctx->height; h++) {
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const uint32_t *src = (const uint32_t*)psrc;
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uint32_t val;
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for (w = 0; w < avctx->width - 5; w += 6) {
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READ_PIXELS(u, y, v);
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READ_PIXELS(y, u, y);
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READ_PIXELS(v, y, u);
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READ_PIXELS(y, v, y);
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}
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if (w < avctx->width - 1) {
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READ_PIXELS(u, y, v);
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val = av_le2ne32(*src++);
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*y++ = val << 6;
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}
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if (w < avctx->width - 3) {
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*u++ = (val >> 4) & 0xFFC0;
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*y++ = (val >> 14) & 0xFFC0;
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val = av_le2ne32(*src++);
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*v++ = val << 6;
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*y++ = (val >> 4) & 0xFFC0;
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}
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psrc += stride;
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y += pic->linesize[0] / 2 - avctx->width;
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u += pic->linesize[1] / 2 - avctx->width / 2;
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v += pic->linesize[2] / 2 - avctx->width / 2;
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = *avctx->coded_frame;
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return avpkt->size;
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}
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static av_cold int decode_close(AVCodecContext *avctx)
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{
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AVFrame *pic = avctx->coded_frame;
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if (pic->data[0])
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avctx->release_buffer(avctx, pic);
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av_freep(&avctx->coded_frame);
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return 0;
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}
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AVCodec ff_v210_decoder = {
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.name = "v210",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_V210,
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.init = decode_init,
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.close = decode_close,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
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};
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