libavcodec/rawdec.c

   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 libavcodec/rawdec.c
  24  * Raw Video Decoder
  25  */
  26
  27 #include "avcodec.h"
  28 #include "raw.h"
  29 #include "libavutil/intreadwrite.h"
  30
  31 typedef 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
  38 static 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
  48 static const PixelFormatTag pixelFormatBpsMOV[] = {
  49     { PIX_FMT_PAL8,      4 },
  50     { PIX_FMT_PAL8,      8 },
  51     // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
  52     // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
  53     { PIX_FMT_BGR555,   16 },
  54     { PIX_FMT_RGB24,    24 },
  55     { PIX_FMT_BGR32_1,  32 },
  56     { PIX_FMT_NONE, 0 },
  57 };
  58
  59 static enum PixelFormat findPixelFormat(const PixelFormatTag *tags, unsigned int fourcc)
  60 {
  61     while (tags->pix_fmt >= 0) {
  62         if (tags->fourcc == fourcc)
  63             return tags->pix_fmt;
  64         tags++;
  65     }
  66     return PIX_FMT_YUV420P;
  67 }
  68
  69 static av_cold int raw_init_decoder(AVCodecContext *avctx)
  70 {
  71     RawVideoContext *context = avctx->priv_data;
  72
  73     if (avctx->codec_tag == MKTAG('r','a','w',' '))
  74         avctx->pix_fmt = findPixelFormat(pixelFormatBpsMOV, avctx->bits_per_coded_sample);
  75     else if (avctx->codec_tag)
  76         avctx->pix_fmt = findPixelFormat(ff_raw_pixelFormatTags, avctx->codec_tag);
  77     else if (avctx->bits_per_coded_sample)
  78         avctx->pix_fmt = findPixelFormat(pixelFormatBpsAVI, avctx->bits_per_coded_sample);
  79
  80     context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
  81     context->buffer = av_malloc(context->length);
  82     context->pic.pict_type = FF_I_TYPE;
  83     context->pic.key_frame = 1;
  84
  85     avctx->coded_frame= &context->pic;
  86
  87     if (!context->buffer)
  88         return -1;
  89
  90     if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
  91        avctx->codec_tag == MKTAG( 3 ,  0 ,  0 ,  0 ))
  92         context->flip=1;
  93
  94     return 0;
  95 }
  96
  97 static void flip(AVCodecContext *avctx, AVPicture * picture){
  98     picture->data[0] += picture->linesize[0] * (avctx->height-1);
  99     picture->linesize[0] *= -1;
 100 }
 101
 102 static int raw_decode(AVCodecContext *avctx,
 103                             void *data, int *data_size,
 104                             AVPacket *avpkt)
 105 {
 106     const uint8_t *buf = avpkt->data;
 107     int buf_size = avpkt->size;
 108     RawVideoContext *context = avctx->priv_data;
 109
 110     AVFrame * frame = (AVFrame *) data;
 111     AVPicture * picture = (AVPicture *) data;
 112
 113     frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
 114     frame->top_field_first = avctx->coded_frame->top_field_first;
 115
 116     //4bpp raw in avi and mov (yes this is ugly ...)
 117     if(avctx->bits_per_coded_sample == 4 && avctx->pix_fmt==PIX_FMT_PAL8 &&
 118        (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
 119         int i;
 120         for(i=256*2; i+1 < context->length>>1; i++){
 121             context->buffer[2*i+0]= buf[i-256*2]>>4;
 122             context->buffer[2*i+1]= buf[i-256*2]&15;
 123         }
 124         buf= context->buffer + 256*4;
 125         buf_size= context->length - 256*4;
 126     }
 127
 128     if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
 129         return -1;
 130
 131     avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
 132     if(avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length){
 133         frame->data[1]= context->buffer;
 134     }
 135     if (avctx->palctrl && avctx->palctrl->palette_changed) {
 136         memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
 137         avctx->palctrl->palette_changed = 0;
 138     }
 139
 140     if(context->flip)
 141         flip(avctx, picture);
 142
 143     if (   avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
 144         || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
 145     {
 146         // swap fields
 147         unsigned char *tmp = picture->data[1];
 148         picture->data[1] = picture->data[2];
 149         picture->data[2] = tmp;
 150     }
 151
 152     if(avctx->codec_tag == AV_RL32("yuv2") &&
 153        avctx->pix_fmt   == PIX_FMT_YUYV422) {
 154         int x, y;
 155         uint8_t *line = picture->data[0];
 156         for(y = 0; y < avctx->height; y++) {
 157             for(x = 0; x < avctx->width; x++)
 158                 line[2*x + 1] ^= 0x80;
 159             line += picture->linesize[0];
 160         }
 161     }
 162
 163     *data_size = sizeof(AVPicture);
 164     return buf_size;
 165 }
 166
 167 static av_cold int raw_close_decoder(AVCodecContext *avctx)
 168 {
 169     RawVideoContext *context = avctx->priv_data;
 170
 171     av_freep(&context->buffer);
 172     return 0;
 173 }
 174
 175 AVCodec rawvideo_decoder = {
 176     "rawvideo",
 177     CODEC_TYPE_VIDEO,
 178     CODEC_ID_RAWVIDEO,
 179     sizeof(RawVideoContext),
 180     raw_init_decoder,
 181     NULL,
 182     raw_close_decoder,
 183     raw_decode,
 184     .long_name = NULL_IF_CONFIG_SMALL("raw video"),
 185 };