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 Libav.
   8  *
   9  * Libav 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  * Libav 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 Libav; 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 "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 AVERROR(EINVAL);
  32     }
  33
  34     if (avctx->pix_fmt != PIX_FMT_YUV422P10) {
  35         av_log(avctx, AV_LOG_ERROR, "v210 needs YUV422P10\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     if (!avctx->coded_frame)
  45         return AVERROR(ENOMEM);
  46
  47     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
  48
  49     return 0;
  50 }
  51
  52 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
  53                         int buf_size, void *data)
  54 {
  55     const AVFrame *pic = data;
  56     int aligned_width = ((avctx->width + 47) / 48) * 48;
  57     int stride = aligned_width * 8 / 3;
  58     int h, w;
  59     const uint16_t *y = (const uint16_t*)pic->data[0];
  60     const uint16_t *u = (const uint16_t*)pic->data[1];
  61     const uint16_t *v = (const uint16_t*)pic->data[2];
  62     uint8_t *p = buf;
  63     uint8_t *pdst = buf;
  64
  65     if (buf_size < aligned_width * avctx->height * 8 / 3) {
  66         av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
  67         return AVERROR(ENOMEM);
  68     }
  69
  70 #define CLIP(v) av_clip(v, 4, 1019)
  71
  72 #define WRITE_PIXELS(a, b, c)           \
  73     do {                                \
  74         val =   CLIP(*a++);             \
  75         val |= (CLIP(*b++) << 10) |     \
  76                (CLIP(*c++) << 20);      \
  77         bytestream_put_le32(&p, val);   \
  78     } while (0)
  79
  80     for (h = 0; h < avctx->height; h++) {
  81         uint32_t val;
  82         for (w = 0; w < avctx->width - 5; w += 6) {
  83             WRITE_PIXELS(u, y, v);
  84             WRITE_PIXELS(y, u, y);
  85             WRITE_PIXELS(v, y, u);
  86             WRITE_PIXELS(y, v, y);
  87         }
  88         if (w < avctx->width - 1) {
  89             WRITE_PIXELS(u, y, v);
  90
  91             val = CLIP(*y++);
  92             if (w == avctx->width - 2)
  93                 bytestream_put_le32(&p, val);
  94         }
  95         if (w < avctx->width - 3) {
  96             val |= (CLIP(*u++) << 10) | (CLIP(*y++) << 20);
  97             bytestream_put_le32(&p, val);
  98
  99             val = CLIP(*v++) | (CLIP(*y++) << 10);
 100             bytestream_put_le32(&p, val);
 101         }
 102
 103         pdst += stride;
 104         memset(p, 0, pdst - p);
 105         p = pdst;
 106         y += pic->linesize[0] / 2 - avctx->width;
 107         u += pic->linesize[1] / 2 - avctx->width / 2;
 108         v += pic->linesize[2] / 2 - avctx->width / 2;
 109     }
 110
 111     return p - buf;
 112 }
 113
 114 static av_cold int encode_close(AVCodecContext *avctx)
 115 {
 116     av_freep(&avctx->coded_frame);
 117
 118     return 0;
 119 }
 120
 121 AVCodec ff_v210_encoder = {
 122     .name           = "v210",
 123     .type           = AVMEDIA_TYPE_VIDEO,
 124     .id             = CODEC_ID_V210,
 125     .init           = encode_init,
 126     .encode         = encode_frame,
 127     .close          = encode_close,
 128     .pix_fmts       = (const enum PixelFormat[]){PIX_FMT_YUV422P10, PIX_FMT_NONE},
 129     .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
 130 };