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ffmpeg / libavcodec / v210dec.c @ d87d5025

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/*
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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 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 "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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    if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0)
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        return -1;
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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 = FF_I_TYPE;
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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  = le2me_32(*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  = le2me_32(*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  = le2me_32(*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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    av_freep(&avctx->coded_frame);
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    return 0;
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}
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AVCodec v210_decoder = {
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    "v210",
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    CODEC_TYPE_VIDEO,
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    CODEC_ID_V210,
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    0,
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    decode_init,
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    NULL,
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    decode_close,
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    decode_frame,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
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};