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libavcodec/v210enc.c

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00001 /*
00002  * V210 encoder
00003  *
00004  * Copyright (C) 2009 Michael Niedermayer <michaelni@gmx.at>
00005  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>
00006  *
00007  * This file is part of FFmpeg.
00008  *
00009  * FFmpeg is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  *
00014  * FFmpeg is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017  * Lesser General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU Lesser General Public
00020  * License along with FFmpeg; if not, write to the Free Software
00021  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00022  */
00023 
00024 #include "avcodec.h"
00025 #include "libavcodec/bytestream.h"
00026 
00027 static av_cold int encode_init(AVCodecContext *avctx)
00028 {
00029     if (avctx->width & 1) {
00030         av_log(avctx, AV_LOG_ERROR, "v210 needs even width\n");
00031         return -1;
00032     }
00033 
00034     if (avctx->pix_fmt != PIX_FMT_YUV422P16) {
00035         av_log(avctx, AV_LOG_ERROR, "v210 needs YUV422P16\n");
00036         return -1;
00037     }
00038 
00039     if (avctx->bits_per_raw_sample != 10)
00040         av_log(avctx, AV_LOG_WARNING, "bits per raw sample: %d != 10-bit\n",
00041                avctx->bits_per_raw_sample);
00042 
00043     avctx->coded_frame = avcodec_alloc_frame();
00044 
00045     avctx->coded_frame->key_frame = 1;
00046     avctx->coded_frame->pict_type = FF_I_TYPE;
00047 
00048     return 0;
00049 }
00050 
00051 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
00052                         int buf_size, void *data)
00053 {
00054     const AVFrame *pic = data;
00055     int aligned_width = ((avctx->width + 47) / 48) * 48;
00056     int stride = aligned_width * 8 / 3;
00057     int h, w;
00058     const uint16_t *y = (const uint16_t*)pic->data[0];
00059     const uint16_t *u = (const uint16_t*)pic->data[1];
00060     const uint16_t *v = (const uint16_t*)pic->data[2];
00061     uint8_t *p = buf;
00062     uint8_t *pdst = buf;
00063 
00064     if (buf_size < aligned_width * avctx->height * 8 / 3) {
00065         av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
00066         return -1;
00067     }
00068 
00069 #define WRITE_PIXELS(a, b, c)           \
00070     do {                                \
00071         val =  (*a++           >>  6) | \
00072               ((*b++ & 0xFFC0) <<  4);  \
00073         val|=  (*c++ & 0xFFC0) << 14;   \
00074         bytestream_put_le32(&p, val);   \
00075     } while (0)
00076 
00077     for (h = 0; h < avctx->height; h++) {
00078         uint32_t val;
00079         for (w = 0; w < avctx->width - 5; w += 6) {
00080             WRITE_PIXELS(u, y, v);
00081             WRITE_PIXELS(y, u, y);
00082             WRITE_PIXELS(v, y, u);
00083             WRITE_PIXELS(y, v, y);
00084         }
00085         if (w < avctx->width - 1) {
00086             WRITE_PIXELS(u, y, v);
00087 
00088             val =   *y++           >>  6;
00089             if (w == avctx->width - 2)
00090                 bytestream_put_le32(&p, val);
00091         }
00092         if (w < avctx->width - 3) {
00093             val |=((*u++ & 0xFFC0) <<  4) |
00094                   ((*y++ & 0xFFC0) << 14);
00095             bytestream_put_le32(&p, val);
00096 
00097             val =  (*v++           >>  6) |
00098                    (*y++ & 0xFFC0) <<  4;
00099             bytestream_put_le32(&p, val);
00100         }
00101 
00102         pdst += stride;
00103         memset(p, 0, pdst - p);
00104         p = pdst;
00105         y += pic->linesize[0] / 2 - avctx->width;
00106         u += pic->linesize[1] / 2 - avctx->width / 2;
00107         v += pic->linesize[2] / 2 - avctx->width / 2;
00108     }
00109 
00110     return p - buf;
00111 }
00112 
00113 static av_cold int encode_close(AVCodecContext *avctx)
00114 {
00115     av_freep(&avctx->coded_frame);
00116 
00117     return 0;
00118 }
00119 
00120 AVCodec v210_encoder = {
00121     "v210",
00122     AVMEDIA_TYPE_VIDEO,
00123     CODEC_ID_V210,
00124     0,
00125     encode_init,
00126     encode_frame,
00127     encode_close,
00128     .pix_fmts = (const enum PixelFormat[]){PIX_FMT_YUV422P16, PIX_FMT_NONE},
00129     .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
00130 };

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