Libav
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00001 /* 00002 * V210 decoder 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 "libavutil/bswap.h" 00026 00027 static av_cold int decode_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 avctx->pix_fmt = PIX_FMT_YUV422P16; 00034 avctx->bits_per_raw_sample = 10; 00035 00036 avctx->coded_frame = avcodec_alloc_frame(); 00037 00038 return 0; 00039 } 00040 00041 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, 00042 AVPacket *avpkt) 00043 { 00044 int h, w; 00045 AVFrame *pic = avctx->coded_frame; 00046 const uint8_t *psrc = avpkt->data; 00047 uint16_t *y, *u, *v; 00048 int aligned_width = ((avctx->width + 47) / 48) * 48; 00049 int stride = aligned_width * 8 / 3; 00050 00051 if (pic->data[0]) 00052 avctx->release_buffer(avctx, pic); 00053 00054 if (avpkt->size < stride * avctx->height) { 00055 av_log(avctx, AV_LOG_ERROR, "packet too small\n"); 00056 return -1; 00057 } 00058 00059 pic->reference = 0; 00060 if (avctx->get_buffer(avctx, pic) < 0) 00061 return -1; 00062 00063 y = (uint16_t*)pic->data[0]; 00064 u = (uint16_t*)pic->data[1]; 00065 v = (uint16_t*)pic->data[2]; 00066 pic->pict_type = FF_I_TYPE; 00067 pic->key_frame = 1; 00068 00069 #define READ_PIXELS(a, b, c) \ 00070 do { \ 00071 val = le2me_32(*src++); \ 00072 *a++ = val << 6; \ 00073 *b++ = (val >> 4) & 0xFFC0; \ 00074 *c++ = (val >> 14) & 0xFFC0; \ 00075 } while (0) 00076 00077 for (h = 0; h < avctx->height; h++) { 00078 const uint32_t *src = (const uint32_t*)psrc; 00079 uint32_t val; 00080 for (w = 0; w < avctx->width - 5; w += 6) { 00081 READ_PIXELS(u, y, v); 00082 READ_PIXELS(y, u, y); 00083 READ_PIXELS(v, y, u); 00084 READ_PIXELS(y, v, y); 00085 } 00086 if (w < avctx->width - 1) { 00087 READ_PIXELS(u, y, v); 00088 00089 val = le2me_32(*src++); 00090 *y++ = val << 6; 00091 } 00092 if (w < avctx->width - 3) { 00093 *u++ = (val >> 4) & 0xFFC0; 00094 *y++ = (val >> 14) & 0xFFC0; 00095 00096 val = le2me_32(*src++); 00097 *v++ = val << 6; 00098 *y++ = (val >> 4) & 0xFFC0; 00099 } 00100 00101 psrc += stride; 00102 y += pic->linesize[0] / 2 - avctx->width; 00103 u += pic->linesize[1] / 2 - avctx->width / 2; 00104 v += pic->linesize[2] / 2 - avctx->width / 2; 00105 } 00106 00107 *data_size = sizeof(AVFrame); 00108 *(AVFrame*)data = *avctx->coded_frame; 00109 00110 return avpkt->size; 00111 } 00112 00113 static av_cold int decode_close(AVCodecContext *avctx) 00114 { 00115 AVFrame *pic = avctx->coded_frame; 00116 if (pic->data[0]) 00117 avctx->release_buffer(avctx, pic); 00118 av_freep(&avctx->coded_frame); 00119 00120 return 0; 00121 } 00122 00123 AVCodec v210_decoder = { 00124 "v210", 00125 AVMEDIA_TYPE_VIDEO, 00126 CODEC_ID_V210, 00127 0, 00128 decode_init, 00129 NULL, 00130 decode_close, 00131 decode_frame, 00132 CODEC_CAP_DR1, 00133 .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"), 00134 };