154 lines
4.8 KiB
C
154 lines
4.8 KiB
C
/*
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* 012v decoder
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*
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* Copyright (C) 2012 Carl Eugen Hoyos
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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 "avcodec.h"
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#include "internal.h"
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#include "libavutil/intreadwrite.h"
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static av_cold int zero12v_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
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avctx->bits_per_raw_sample = 10;
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if (avctx->codec_tag == MKTAG('a', '1', '2', 'v'))
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avpriv_request_sample(avctx, "transparency");
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return 0;
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}
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static int zero12v_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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int line = 0, ret;
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const int width = avctx->width;
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AVFrame *pic = data;
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uint16_t *y, *u, *v;
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const uint8_t *line_end, *src = avpkt->data;
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int stride = avctx->width * 8 / 3;
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if (width == 1) {
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av_log(avctx, AV_LOG_ERROR, "Width 1 not supported.\n");
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return AVERROR_INVALIDDATA;
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}
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if (avpkt->size < avctx->height * stride) {
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av_log(avctx, AV_LOG_ERROR, "Packet too small: %d instead of %d\n",
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avpkt->size, avctx->height * stride);
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return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
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return ret;
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pic->pict_type = AV_PICTURE_TYPE_I;
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pic->key_frame = 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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line_end = avpkt->data + stride;
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while (line++ < avctx->height) {
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while (1) {
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uint32_t t = AV_RL32(src);
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src += 4;
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*u++ = t << 6 & 0xFFC0;
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*y++ = t >> 4 & 0xFFC0;
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*v++ = t >> 14 & 0xFFC0;
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if (src >= line_end - 1) {
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*y = 0x80;
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src++;
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line_end += stride;
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y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
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u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
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v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
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break;
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}
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t = AV_RL32(src);
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src += 4;
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*y++ = t << 6 & 0xFFC0;
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*u++ = t >> 4 & 0xFFC0;
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*y++ = t >> 14 & 0xFFC0;
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if (src >= line_end - 2) {
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if (!(width & 1)) {
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*y = 0x80;
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src += 2;
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}
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line_end += stride;
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y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
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u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
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v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
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break;
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}
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t = AV_RL32(src);
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src += 4;
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*v++ = t << 6 & 0xFFC0;
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*y++ = t >> 4 & 0xFFC0;
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*u++ = t >> 14 & 0xFFC0;
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if (src >= line_end - 1) {
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*y = 0x80;
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src++;
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line_end += stride;
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y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
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u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
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v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
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break;
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}
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t = AV_RL32(src);
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src += 4;
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*y++ = t << 6 & 0xFFC0;
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*v++ = t >> 4 & 0xFFC0;
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*y++ = t >> 14 & 0xFFC0;
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if (src >= line_end - 2) {
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if (width & 1) {
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*y = 0x80;
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src += 2;
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}
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line_end += stride;
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y = (uint16_t *)(pic->data[0] + line * pic->linesize[0]);
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u = (uint16_t *)(pic->data[1] + line * pic->linesize[1]);
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v = (uint16_t *)(pic->data[2] + line * pic->linesize[2]);
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break;
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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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AVCodec ff_zero12v_decoder = {
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.name = "012v",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_012V,
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.init = zero12v_decode_init,
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.decode = zero12v_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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