1/* 2 * Raw Video Decoder 3 * Copyright (c) 2001 Fabrice Bellard 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * Raw Video Decoder 25 */ 26 27#include "avcodec.h" 28#include "raw.h" 29#include "libavutil/intreadwrite.h" 30 31typedef struct RawVideoContext { 32 unsigned char * buffer; /* block of memory for holding one frame */ 33 int length; /* number of bytes in buffer */ 34 int flip; 35 AVFrame pic; ///< AVCodecContext.coded_frame 36} RawVideoContext; 37 38static const PixelFormatTag pixelFormatBpsAVI[] = { 39 { PIX_FMT_PAL8, 4 }, 40 { PIX_FMT_PAL8, 8 }, 41 { PIX_FMT_RGB555, 15 }, 42 { PIX_FMT_RGB555, 16 }, 43 { PIX_FMT_BGR24, 24 }, 44 { PIX_FMT_RGB32, 32 }, 45 { PIX_FMT_NONE, 0 }, 46}; 47 48static const PixelFormatTag pixelFormatBpsMOV[] = { 49 { PIX_FMT_MONOWHITE, 1 }, 50 { PIX_FMT_PAL8, 2 }, 51 { PIX_FMT_PAL8, 4 }, 52 { PIX_FMT_PAL8, 8 }, 53 // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov 54 // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html 55 { PIX_FMT_RGB555BE, 16 }, 56 { PIX_FMT_RGB24, 24 }, 57 { PIX_FMT_ARGB, 32 }, 58 { PIX_FMT_NONE, 0 }, 59}; 60 61static enum PixelFormat findPixelFormat(const PixelFormatTag *tags, unsigned int fourcc) 62{ 63 while (tags->pix_fmt >= 0) { 64 if (tags->fourcc == fourcc) 65 return tags->pix_fmt; 66 tags++; 67 } 68 return PIX_FMT_YUV420P; 69} 70 71static av_cold int raw_init_decoder(AVCodecContext *avctx) 72{ 73 RawVideoContext *context = avctx->priv_data; 74 75 if (avctx->codec_tag == MKTAG('r','a','w',' ')) 76 avctx->pix_fmt = findPixelFormat(pixelFormatBpsMOV, avctx->bits_per_coded_sample); 77 else if (avctx->codec_tag) 78 avctx->pix_fmt = findPixelFormat(ff_raw_pixelFormatTags, avctx->codec_tag); 79 else if (avctx->bits_per_coded_sample) 80 avctx->pix_fmt = findPixelFormat(pixelFormatBpsAVI, avctx->bits_per_coded_sample); 81 82 context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height); 83 context->buffer = av_malloc(context->length); 84 context->pic.pict_type = FF_I_TYPE; 85 context->pic.key_frame = 1; 86 87 avctx->coded_frame= &context->pic; 88 89 if (!context->buffer) 90 return -1; 91 92 if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) || 93 avctx->codec_tag == MKTAG( 3 , 0 , 0 , 0 )) 94 context->flip=1; 95 96 return 0; 97} 98 99static void flip(AVCodecContext *avctx, AVPicture * picture){ 100 picture->data[0] += picture->linesize[0] * (avctx->height-1); 101 picture->linesize[0] *= -1; 102} 103 104static int raw_decode(AVCodecContext *avctx, 105 void *data, int *data_size, 106 AVPacket *avpkt) 107{ 108 const uint8_t *buf = avpkt->data; 109 int buf_size = avpkt->size; 110 RawVideoContext *context = avctx->priv_data; 111 112 AVFrame * frame = (AVFrame *) data; 113 AVPicture * picture = (AVPicture *) data; 114 115 frame->interlaced_frame = avctx->coded_frame->interlaced_frame; 116 frame->top_field_first = avctx->coded_frame->top_field_first; 117 118 //2bpp and 4bpp raw in avi and mov (yes this is ugly ...) 119 if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) && 120 avctx->pix_fmt==PIX_FMT_PAL8 && 121 (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){ 122 int i; 123 uint8_t *dst = context->buffer + 256*4; 124 buf_size = context->length - 256*4; 125 if (avctx->bits_per_coded_sample == 4){ 126 for(i=0; 2*i+1 < buf_size; i++){ 127 dst[2*i+0]= buf[i]>>4; 128 dst[2*i+1]= buf[i]&15; 129 } 130 } else 131 for(i=0; 4*i+3 < buf_size; i++){ 132 dst[4*i+0]= buf[i]>>6; 133 dst[4*i+1]= buf[i]>>4&3; 134 dst[4*i+2]= buf[i]>>2&3; 135 dst[4*i+3]= buf[i] &3; 136 } 137 buf= dst; 138 } 139 140 if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') || 141 avctx->codec_tag == MKTAG('A', 'V', 'u', 'p')) 142 buf += buf_size - context->length; 143 144 if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0)) 145 return -1; 146 147 avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height); 148 if(avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length){ 149 frame->data[1]= context->buffer; 150 } 151 if (avctx->palctrl && avctx->palctrl->palette_changed) { 152 memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE); 153 avctx->palctrl->palette_changed = 0; 154 } 155 if(avctx->pix_fmt==PIX_FMT_BGR24 && ((frame->linesize[0]+3)&~3)*avctx->height <= buf_size) 156 frame->linesize[0] = (frame->linesize[0]+3)&~3; 157 158 if(context->flip) 159 flip(avctx, picture); 160 161 if ( avctx->codec_tag == MKTAG('Y', 'V', '1', '2') 162 || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9')) 163 FFSWAP(uint8_t *, picture->data[1], picture->data[2]); 164 165 if(avctx->codec_tag == AV_RL32("yuv2") && 166 avctx->pix_fmt == PIX_FMT_YUYV422) { 167 int x, y; 168 uint8_t *line = picture->data[0]; 169 for(y = 0; y < avctx->height; y++) { 170 for(x = 0; x < avctx->width; x++) 171 line[2*x + 1] ^= 0x80; 172 line += picture->linesize[0]; 173 } 174 } 175 176 *data_size = sizeof(AVPicture); 177 return buf_size; 178} 179 180static av_cold int raw_close_decoder(AVCodecContext *avctx) 181{ 182 RawVideoContext *context = avctx->priv_data; 183 184 av_freep(&context->buffer); 185 return 0; 186} 187 188AVCodec rawvideo_decoder = { 189 "rawvideo", 190 AVMEDIA_TYPE_VIDEO, 191 CODEC_ID_RAWVIDEO, 192 sizeof(RawVideoContext), 193 raw_init_decoder, 194 NULL, 195 raw_close_decoder, 196 raw_decode, 197 .long_name = NULL_IF_CONFIG_SMALL("raw video"), 198}; 199