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ffmpeg / libavcodec / v210enc.c @ 72415b2a

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/*
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 * V210 encoder
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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 "libavcodec/bytestream.h"
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static av_cold int encode_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 (avctx->pix_fmt != PIX_FMT_YUV422P16) {
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        av_log(avctx, AV_LOG_ERROR, "v210 needs YUV422P16\n");
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        return -1;
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    }
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    if (avctx->bits_per_raw_sample != 10)
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        av_log(avctx, AV_LOG_WARNING, "bits per raw sample: %d != 10-bit\n",
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               avctx->bits_per_raw_sample);
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    avctx->coded_frame = avcodec_alloc_frame();
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    avctx->coded_frame->key_frame = 1;
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    avctx->coded_frame->pict_type = FF_I_TYPE;
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    return 0;
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}
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static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
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                        int buf_size, void *data)
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{
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    const AVFrame *pic = data;
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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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    int h, w;
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    const uint16_t *y = (const uint16_t*)pic->data[0];
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    const uint16_t *u = (const uint16_t*)pic->data[1];
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    const uint16_t *v = (const uint16_t*)pic->data[2];
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    uint8_t *p = buf;
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    uint8_t *pdst = buf;
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    if (buf_size < aligned_width * avctx->height * 8 / 3) {
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        av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
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        return -1;
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    }
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#define WRITE_PIXELS(a, b, c)           \
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    do {                                \
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        val =  (*a++           >>  6) | \
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              ((*b++ & 0xFFC0) <<  4);  \
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        val|=  (*c++ & 0xFFC0) << 14;   \
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        bytestream_put_le32(&p, val);   \
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    } while (0)
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    for (h = 0; h < avctx->height; h++) {
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        uint32_t val;
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        for (w = 0; w < avctx->width - 5; w += 6) {
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            WRITE_PIXELS(u, y, v);
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            WRITE_PIXELS(y, u, y);
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            WRITE_PIXELS(v, y, u);
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            WRITE_PIXELS(y, v, y);
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        }
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        if (w < avctx->width - 1) {
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            WRITE_PIXELS(u, y, v);
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            val =   *y++           >>  6;
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            if (w == avctx->width - 2)
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                bytestream_put_le32(&p, val);
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        }
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        if (w < avctx->width - 3) {
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            val |=((*u++ & 0xFFC0) <<  4) |
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                  ((*y++ & 0xFFC0) << 14);
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            bytestream_put_le32(&p, val);
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            val =  (*v++           >>  6) |
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                   (*y++ & 0xFFC0) <<  4;
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            bytestream_put_le32(&p, val);
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        }
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        pdst += stride;
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        memset(p, 0, pdst - p);
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        p = pdst;
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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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    return p - buf;
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}
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static av_cold int encode_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_encoder = {
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    "v210",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_V210,
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    0,
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    encode_init,
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    encode_frame,
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    encode_close,
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    .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV422P16, PIX_FMT_NONE},
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    .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
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};