libavcodec/v210enc.c

   1 /*
   2  * V210 encoder
   3  *
   4  * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
   5  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * FFmpeg is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include "avcodec.h"
  25 #include "libavcodec/bytestream.h"
  26
  27 static av_cold int encode_init(AVCodecContext *avctx)
  28 {
  29     if (avctx->width & 1) {
  30         av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
  31         return -1;
  32     }
  33
  34     if (avctx->pix_fmt != PIX_FMT_YUV422P16) {
  35         av_log(avctx, AV_LOG_ERROR, "v210 needs YUV422P16\n");
  36         return -1;
  37     }
  38
  39     if (avctx->bits_per_raw_sample != 10)
  40         av_log(avctx, AV_LOG_WARNING, "bits per raw sample: %d != 10-bit\n",
  41                avctx->bits_per_raw_sample);
  42
  43     avctx->coded_frame = avcodec_alloc_frame();
  44
  45     avctx->coded_frame->key_frame = 1;
  46     avctx->coded_frame->pict_type = FF_I_TYPE;
  47
  48     return 0;
  49 }
  50
  51 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
  52                         int buf_size, void *data)
  53 {
  54     const AVFrame *pic = data;
  55     int aligned_width = ((avctx->width + 47) / 48) * 48;
  56     int stride = aligned_width * 8 / 3;
  57     int h, w;
  58     const uint16_t *y = (const uint16_t*)pic->data[0];
  59     const uint16_t *u = (const uint16_t*)pic->data[1];
  60     const uint16_t *v = (const uint16_t*)pic->data[2];
  61     uint8_t *p = buf;
  62     uint8_t *pdst = buf;
  63
  64     if (buf_size < aligned_width * avctx->height * 8 / 3) {
  65         av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
  66         return -1;
  67     }
  68
  69 #define WRITE_PIXELS(a, b, c)           \
  70     do {                                \
  71         val =  (*a++           >>  6) | \
  72               ((*b++ & 0xFFC0) <<  4);  \
  73         val|=  (*c++ & 0xFFC0) << 14;   \
  74         bytestream_put_le32(&p, val);   \
  75     } while (0);
  76
  77     for (h = 0; h < avctx->height; h++) {
  78         uint32_t val;
  79         for (w = 0; w < avctx->width - 5; w += 6) {
  80             WRITE_PIXELS(u, y, v);
  81             WRITE_PIXELS(y, u, y);
  82             WRITE_PIXELS(v, y, u);
  83             WRITE_PIXELS(y, v, y);
  84         }
  85         if (w < avctx->width - 1) {
  86             WRITE_PIXELS(u, y, v);
  87
  88             val =   *y++           >>  6;
  89             if (w == avctx->width - 2)
  90                 bytestream_put_le32(&p, val);
  91         }
  92         if (w < avctx->width - 3) {
  93             val |=((*u++ & 0xFFC0) <<  4) |
  94                   ((*y++ & 0xFFC0) << 14);
  95             bytestream_put_le32(&p, val);
  96
  97             val =  (*v++           >>  6) |
  98                    (*y++ & 0xFFC0) <<  4;
  99             bytestream_put_le32(&p, val);
 100         }
 101
 102         pdst += stride;
 103         memset(p, 0, pdst - p);
 104         p = pdst;
 105         y += pic->linesize[0] / 2 - avctx->width;
 106         u += pic->linesize[1] / 2 - avctx->width / 2;
 107         v += pic->linesize[2] / 2 - avctx->width / 2;
 108     }
 109
 110     return p - buf;
 111 }
 112
 113 static av_cold int encode_close(AVCodecContext *avctx)
 114 {
 115     av_freep(&avctx->coded_frame);
 116
 117     return 0;
 118 }
 119
 120 AVCodec v210_encoder = {
 121     "v210",
 122     CODEC_TYPE_VIDEO,
 123     CODEC_ID_V210,
 124     0,
 125     encode_init,
 126     encode_frame,
 127     encode_close,
 128     .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV422P16, PIX_FMT_NONE},
 129     .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
 130 };