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 #include "internal.h"
  27
  28 static av_cold int encode_init(AVCodecContext *avctx)
  29 {
  30     if (avctx->width & 1) {
  31         av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
  32         return AVERROR(EINVAL);
  33     }
  34
  35     if (avctx->bits_per_raw_sample != 10)
  36         av_log(avctx, AV_LOG_WARNING, "bits per raw sample: %d != 10-bit\n",
  37                avctx->bits_per_raw_sample);
  38
  39     avctx->coded_frame = avcodec_alloc_frame();
  40     if (!avctx->coded_frame)
  41         return AVERROR(ENOMEM);
  42
  43     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
  44
  45     return 0;
  46 }
  47
  48 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  49                         const AVFrame *pic, int *got_packet)
  50 {
  51     int aligned_width = ((avctx->width + 47) / 48) * 48;
  52     int stride = aligned_width * 8 / 3;
  53     int line_padding = stride - ((avctx->width * 8 + 11) / 12) * 4;
  54     int h, w, ret;
  55     const uint16_t *y = (const uint16_t*)pic->data[0];
  56     const uint16_t *u = (const uint16_t*)pic->data[1];
  57     const uint16_t *v = (const uint16_t*)pic->data[2];
  58     PutByteContext p;
  59
  60     if ((ret = ff_alloc_packet(pkt, avctx->height * stride)) < 0) {
  61         av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
  62         return ret;
  63     }
  64
  65     bytestream2_init_writer(&p, pkt->data, pkt->size);
  66
  67 #define CLIP(v) av_clip(v, 4, 1019)
  68
  69 #define WRITE_PIXELS(a, b, c)           \
  70     do {                                \
  71         val =   CLIP(*a++);             \
  72         val |= (CLIP(*b++) << 10) |     \
  73                (CLIP(*c++) << 20);      \
  74         bytestream2_put_le32u(&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 = CLIP(*y++);
  89             if (w == avctx->width - 2)
  90                 bytestream2_put_le32u(&p, val);
  91         }
  92         if (w < avctx->width - 3) {
  93             val |= (CLIP(*u++) << 10) | (CLIP(*y++) << 20);
  94             bytestream2_put_le32u(&p, val);
  95
  96             val = CLIP(*v++) | (CLIP(*y++) << 10);
  97             bytestream2_put_le32u(&p, val);
  98         }
  99
 100         bytestream2_set_buffer(&p, 0, line_padding);
 101
 102         y += pic->linesize[0] / 2 - avctx->width;
 103         u += pic->linesize[1] / 2 - avctx->width / 2;
 104         v += pic->linesize[2] / 2 - avctx->width / 2;
 105     }
 106
 107     pkt->flags |= AV_PKT_FLAG_KEY;
 108     *got_packet = 1;
 109     return 0;
 110 }
 111
 112 static av_cold int encode_close(AVCodecContext *avctx)
 113 {
 114     av_freep(&avctx->coded_frame);
 115
 116     return 0;
 117 }
 118
 119 AVCodec ff_v210_encoder = {
 120     .name           = "v210",
 121     .type           = AVMEDIA_TYPE_VIDEO,
 122     .id             = AV_CODEC_ID_V210,
 123     .init           = encode_init,
 124     .encode2        = encode_frame,
 125     .close          = encode_close,
 126     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV422P10, AV_PIX_FMT_NONE },
 127     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
 128 };