Libav
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00001 /* 00002 * Raw Video Decoder 00003 * Copyright (c) 2001 Fabrice Bellard 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00027 #include "avcodec.h" 00028 #include "raw.h" 00029 #include "libavutil/intreadwrite.h" 00030 00031 typedef struct RawVideoContext { 00032 unsigned char * buffer; /* block of memory for holding one frame */ 00033 int length; /* number of bytes in buffer */ 00034 int flip; 00035 AVFrame pic; 00036 } RawVideoContext; 00037 00038 static const PixelFormatTag pixelFormatBpsAVI[] = { 00039 { PIX_FMT_PAL8, 4 }, 00040 { PIX_FMT_PAL8, 8 }, 00041 { PIX_FMT_RGB555, 15 }, 00042 { PIX_FMT_RGB555, 16 }, 00043 { PIX_FMT_BGR24, 24 }, 00044 { PIX_FMT_RGB32, 32 }, 00045 { PIX_FMT_NONE, 0 }, 00046 }; 00047 00048 static const PixelFormatTag pixelFormatBpsMOV[] = { 00049 { PIX_FMT_MONOWHITE, 1 }, 00050 { PIX_FMT_PAL8, 2 }, 00051 { PIX_FMT_PAL8, 4 }, 00052 { PIX_FMT_PAL8, 8 }, 00053 // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov 00054 // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html 00055 { PIX_FMT_RGB555BE, 16 }, 00056 { PIX_FMT_RGB24, 24 }, 00057 { PIX_FMT_ARGB, 32 }, 00058 { PIX_FMT_NONE, 0 }, 00059 }; 00060 00061 static enum PixelFormat findPixelFormat(const PixelFormatTag *tags, unsigned int fourcc) 00062 { 00063 while (tags->pix_fmt >= 0) { 00064 if (tags->fourcc == fourcc) 00065 return tags->pix_fmt; 00066 tags++; 00067 } 00068 return PIX_FMT_YUV420P; 00069 } 00070 00071 static av_cold int raw_init_decoder(AVCodecContext *avctx) 00072 { 00073 RawVideoContext *context = avctx->priv_data; 00074 00075 if (avctx->codec_tag == MKTAG('r','a','w',' ')) 00076 avctx->pix_fmt = findPixelFormat(pixelFormatBpsMOV, avctx->bits_per_coded_sample); 00077 else if (avctx->codec_tag) 00078 avctx->pix_fmt = findPixelFormat(ff_raw_pixelFormatTags, avctx->codec_tag); 00079 else if (avctx->bits_per_coded_sample) 00080 avctx->pix_fmt = findPixelFormat(pixelFormatBpsAVI, avctx->bits_per_coded_sample); 00081 00082 context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height); 00083 context->buffer = av_malloc(context->length); 00084 context->pic.pict_type = FF_I_TYPE; 00085 context->pic.key_frame = 1; 00086 00087 avctx->coded_frame= &context->pic; 00088 00089 if (!context->buffer) 00090 return -1; 00091 00092 if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) || 00093 avctx->codec_tag == MKTAG( 3 , 0 , 0 , 0 )) 00094 context->flip=1; 00095 00096 return 0; 00097 } 00098 00099 static void flip(AVCodecContext *avctx, AVPicture * picture){ 00100 picture->data[0] += picture->linesize[0] * (avctx->height-1); 00101 picture->linesize[0] *= -1; 00102 } 00103 00104 static int raw_decode(AVCodecContext *avctx, 00105 void *data, int *data_size, 00106 AVPacket *avpkt) 00107 { 00108 const uint8_t *buf = avpkt->data; 00109 int buf_size = avpkt->size; 00110 RawVideoContext *context = avctx->priv_data; 00111 00112 AVFrame * frame = (AVFrame *) data; 00113 AVPicture * picture = (AVPicture *) data; 00114 00115 frame->interlaced_frame = avctx->coded_frame->interlaced_frame; 00116 frame->top_field_first = avctx->coded_frame->top_field_first; 00117 00118 //2bpp and 4bpp raw in avi and mov (yes this is ugly ...) 00119 if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) && 00120 avctx->pix_fmt==PIX_FMT_PAL8 && 00121 (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){ 00122 int i; 00123 uint8_t *dst = context->buffer + 256*4; 00124 buf_size = context->length - 256*4; 00125 if (avctx->bits_per_coded_sample == 4){ 00126 for(i=0; 2*i+1 < buf_size; i++){ 00127 dst[2*i+0]= buf[i]>>4; 00128 dst[2*i+1]= buf[i]&15; 00129 } 00130 } else 00131 for(i=0; 4*i+3 < buf_size; i++){ 00132 dst[4*i+0]= buf[i]>>6; 00133 dst[4*i+1]= buf[i]>>4&3; 00134 dst[4*i+2]= buf[i]>>2&3; 00135 dst[4*i+3]= buf[i] &3; 00136 } 00137 buf= dst; 00138 } 00139 00140 if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') || 00141 avctx->codec_tag == MKTAG('A', 'V', 'u', 'p')) 00142 buf += buf_size - context->length; 00143 00144 if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0)) 00145 return -1; 00146 00147 avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height); 00148 if(avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length){ 00149 frame->data[1]= context->buffer; 00150 } 00151 if (avctx->palctrl && avctx->palctrl->palette_changed) { 00152 memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE); 00153 avctx->palctrl->palette_changed = 0; 00154 } 00155 if(avctx->pix_fmt==PIX_FMT_BGR24 && ((frame->linesize[0]+3)&~3)*avctx->height <= buf_size) 00156 frame->linesize[0] = (frame->linesize[0]+3)&~3; 00157 00158 if(context->flip) 00159 flip(avctx, picture); 00160 00161 if ( avctx->codec_tag == MKTAG('Y', 'V', '1', '2') 00162 || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9')) 00163 FFSWAP(uint8_t *, picture->data[1], picture->data[2]); 00164 00165 if(avctx->codec_tag == AV_RL32("yuv2") && 00166 avctx->pix_fmt == PIX_FMT_YUYV422) { 00167 int x, y; 00168 uint8_t *line = picture->data[0]; 00169 for(y = 0; y < avctx->height; y++) { 00170 for(x = 0; x < avctx->width; x++) 00171 line[2*x + 1] ^= 0x80; 00172 line += picture->linesize[0]; 00173 } 00174 } 00175 00176 *data_size = sizeof(AVPicture); 00177 return buf_size; 00178 } 00179 00180 static av_cold int raw_close_decoder(AVCodecContext *avctx) 00181 { 00182 RawVideoContext *context = avctx->priv_data; 00183 00184 av_freep(&context->buffer); 00185 return 0; 00186 } 00187 00188 AVCodec rawvideo_decoder = { 00189 "rawvideo", 00190 AVMEDIA_TYPE_VIDEO, 00191 CODEC_ID_RAWVIDEO, 00192 sizeof(RawVideoContext), 00193 raw_init_decoder, 00194 NULL, 00195 raw_close_decoder, 00196 raw_decode, 00197 .long_name = NULL_IF_CONFIG_SMALL("raw video"), 00198 };