Libav 0.7.1
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00001 /* 00002 * Raw Video Decoder 00003 * Copyright (c) 2001 Fabrice Bellard 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav 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 * Libav 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 Libav; 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 "imgconvert.h" 00029 #include "raw.h" 00030 #include "libavutil/intreadwrite.h" 00031 #include "libavutil/imgutils.h" 00032 00033 typedef struct RawVideoContext { 00034 uint32_t palette[AVPALETTE_COUNT]; 00035 unsigned char * buffer; /* block of memory for holding one frame */ 00036 int length; /* number of bytes in buffer */ 00037 int flip; 00038 AVFrame pic; 00039 } RawVideoContext; 00040 00041 static const PixelFormatTag pix_fmt_bps_avi[] = { 00042 { PIX_FMT_PAL8, 4 }, 00043 { PIX_FMT_PAL8, 8 }, 00044 { PIX_FMT_RGB444, 12 }, 00045 { PIX_FMT_RGB555, 15 }, 00046 { PIX_FMT_RGB555, 16 }, 00047 { PIX_FMT_BGR24, 24 }, 00048 { PIX_FMT_RGB32, 32 }, 00049 { PIX_FMT_NONE, 0 }, 00050 }; 00051 00052 static const PixelFormatTag pix_fmt_bps_mov[] = { 00053 { PIX_FMT_MONOWHITE, 1 }, 00054 { PIX_FMT_PAL8, 2 }, 00055 { PIX_FMT_PAL8, 4 }, 00056 { PIX_FMT_PAL8, 8 }, 00057 // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov 00058 // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html 00059 { PIX_FMT_RGB555BE, 16 }, 00060 { PIX_FMT_RGB24, 24 }, 00061 { PIX_FMT_ARGB, 32 }, 00062 { PIX_FMT_NONE, 0 }, 00063 }; 00064 00065 static enum PixelFormat find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc) 00066 { 00067 while (tags->pix_fmt >= 0) { 00068 if (tags->fourcc == fourcc) 00069 return tags->pix_fmt; 00070 tags++; 00071 } 00072 return PIX_FMT_YUV420P; 00073 } 00074 00075 static av_cold int raw_init_decoder(AVCodecContext *avctx) 00076 { 00077 RawVideoContext *context = avctx->priv_data; 00078 00079 if (avctx->codec_tag == MKTAG('r','a','w',' ')) 00080 avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_mov, avctx->bits_per_coded_sample); 00081 else if (avctx->codec_tag == MKTAG('W','R','A','W')) 00082 avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample); 00083 else if (avctx->codec_tag) 00084 avctx->pix_fmt = find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag); 00085 else if (avctx->pix_fmt == PIX_FMT_NONE && avctx->bits_per_coded_sample) 00086 avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample); 00087 00088 ff_set_systematic_pal2(context->palette, avctx->pix_fmt); 00089 context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height); 00090 if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) && 00091 avctx->pix_fmt==PIX_FMT_PAL8 && 00092 (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){ 00093 context->buffer = av_malloc(context->length); 00094 if (!context->buffer) 00095 return -1; 00096 } 00097 context->pic.pict_type = AV_PICTURE_TYPE_I; 00098 context->pic.key_frame = 1; 00099 00100 avctx->coded_frame= &context->pic; 00101 00102 if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) || 00103 avctx->codec_tag == MKTAG(3, 0, 0, 0) || avctx->codec_tag == MKTAG('W','R','A','W')) 00104 context->flip=1; 00105 00106 return 0; 00107 } 00108 00109 static void flip(AVCodecContext *avctx, AVPicture * picture){ 00110 picture->data[0] += picture->linesize[0] * (avctx->height-1); 00111 picture->linesize[0] *= -1; 00112 } 00113 00114 static int raw_decode(AVCodecContext *avctx, 00115 void *data, int *data_size, 00116 AVPacket *avpkt) 00117 { 00118 const uint8_t *buf = avpkt->data; 00119 int buf_size = avpkt->size; 00120 RawVideoContext *context = avctx->priv_data; 00121 00122 AVFrame * frame = (AVFrame *) data; 00123 AVPicture * picture = (AVPicture *) data; 00124 00125 frame->interlaced_frame = avctx->coded_frame->interlaced_frame; 00126 frame->top_field_first = avctx->coded_frame->top_field_first; 00127 frame->reordered_opaque = avctx->reordered_opaque; 00128 frame->pkt_pts = avctx->pkt->pts; 00129 00130 if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0)) 00131 return -1; 00132 00133 //2bpp and 4bpp raw in avi and mov (yes this is ugly ...) 00134 if (context->buffer) { 00135 int i; 00136 uint8_t *dst = context->buffer; 00137 buf_size = context->length - 256*4; 00138 if (avctx->bits_per_coded_sample == 4){ 00139 for(i=0; 2*i+1 < buf_size; i++){ 00140 dst[2*i+0]= buf[i]>>4; 00141 dst[2*i+1]= buf[i]&15; 00142 } 00143 } else 00144 for(i=0; 4*i+3 < buf_size; i++){ 00145 dst[4*i+0]= buf[i]>>6; 00146 dst[4*i+1]= buf[i]>>4&3; 00147 dst[4*i+2]= buf[i]>>2&3; 00148 dst[4*i+3]= buf[i] &3; 00149 } 00150 buf= dst; 00151 } 00152 00153 if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') || 00154 avctx->codec_tag == MKTAG('A', 'V', 'u', 'p')) 00155 buf += buf_size - context->length; 00156 00157 avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height); 00158 if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) || 00159 (avctx->pix_fmt!=PIX_FMT_PAL8 && 00160 (av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PAL))){ 00161 frame->data[1]= context->palette; 00162 } 00163 if (avctx->pix_fmt == PIX_FMT_PAL8) { 00164 const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); 00165 00166 if (pal) { 00167 memcpy(frame->data[1], pal, AVPALETTE_SIZE); 00168 frame->palette_has_changed = 1; 00169 } 00170 } 00171 if(avctx->pix_fmt==PIX_FMT_BGR24 && ((frame->linesize[0]+3)&~3)*avctx->height <= buf_size) 00172 frame->linesize[0] = (frame->linesize[0]+3)&~3; 00173 00174 if(context->flip) 00175 flip(avctx, picture); 00176 00177 if ( avctx->codec_tag == MKTAG('Y', 'V', '1', '2') 00178 || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9')) 00179 FFSWAP(uint8_t *, picture->data[1], picture->data[2]); 00180 00181 if(avctx->codec_tag == AV_RL32("yuv2") && 00182 avctx->pix_fmt == PIX_FMT_YUYV422) { 00183 int x, y; 00184 uint8_t *line = picture->data[0]; 00185 for(y = 0; y < avctx->height; y++) { 00186 for(x = 0; x < avctx->width; x++) 00187 line[2*x + 1] ^= 0x80; 00188 line += picture->linesize[0]; 00189 } 00190 } 00191 00192 *data_size = sizeof(AVPicture); 00193 return buf_size; 00194 } 00195 00196 static av_cold int raw_close_decoder(AVCodecContext *avctx) 00197 { 00198 RawVideoContext *context = avctx->priv_data; 00199 00200 av_freep(&context->buffer); 00201 return 0; 00202 } 00203 00204 AVCodec ff_rawvideo_decoder = { 00205 "rawvideo", 00206 AVMEDIA_TYPE_VIDEO, 00207 CODEC_ID_RAWVIDEO, 00208 sizeof(RawVideoContext), 00209 raw_init_decoder, 00210 NULL, 00211 raw_close_decoder, 00212 raw_decode, 00213 .long_name = NULL_IF_CONFIG_SMALL("raw video"), 00214 };