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
  30 typedef struct RawVideoContext {
  31     unsigned char * buffer;  /* block of memory for holding one frame */
  32     int             length;  /* number of bytes in buffer */
  33     int flip;
  34     AVFrame pic;             ///< AVCodecContext.coded_frame
  35 } RawVideoContext;
  36
  37 static const PixelFormatTag pixelFormatBpsAVI[] = {
  38     { PIX_FMT_PAL8,    4 },
  39     { PIX_FMT_PAL8,    8 },
  40     { PIX_FMT_RGB555, 15 },
  41     { PIX_FMT_RGB555, 16 },
  42     { PIX_FMT_BGR24,  24 },
  43     { PIX_FMT_RGB32,  32 },
  44     { PIX_FMT_NONE, 0 },
  45 };
  46
  47 static const PixelFormatTag pixelFormatBpsMOV[] = {
  48     /* FIXME fix swscaler to support those */
  49     /* http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/chapter_4_section_2.html */
  50     { PIX_FMT_PAL8,      4 },
  51     { PIX_FMT_PAL8,      8 },
  52     { PIX_FMT_BGR555,   16 },
  53     { PIX_FMT_RGB24,    24 },
  54     { PIX_FMT_BGR32_1,  32 },
  55     { PIX_FMT_NONE, 0 },
  56 };
  57
  58 static enum PixelFormat findPixelFormat(const PixelFormatTag *tags, unsigned int fourcc)
  59 {
  60     while (tags->pix_fmt >= 0) {
  61         if (tags->fourcc == fourcc)
  62             return tags->pix_fmt;
  63         tags++;
  64     }
  65     return PIX_FMT_YUV420P;
  66 }
  67
  68 static av_cold int raw_init_decoder(AVCodecContext *avctx)
  69 {
  70     RawVideoContext *context = avctx->priv_data;
  71
  72     if (avctx->codec_tag == MKTAG('r','a','w',' '))
  73         avctx->pix_fmt = findPixelFormat(pixelFormatBpsMOV, avctx->bits_per_coded_sample);
  74     else if (avctx->codec_tag)
  75         avctx->pix_fmt = findPixelFormat(ff_raw_pixelFormatTags, avctx->codec_tag);
  76     else if (avctx->bits_per_coded_sample)
  77         avctx->pix_fmt = findPixelFormat(pixelFormatBpsAVI, avctx->bits_per_coded_sample);
  78
  79     context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
  80     context->buffer = av_malloc(context->length);
  81     context->pic.pict_type = FF_I_TYPE;
  82     context->pic.key_frame = 1;
  83
  84     avctx->coded_frame= &context->pic;
  85
  86     if (!context->buffer)
  87         return -1;
  88
  89     if(avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9))
  90         context->flip=1;
  91
  92     return 0;
  93 }
  94
  95 static void flip(AVCodecContext *avctx, AVPicture * picture){
  96     picture->data[0] += picture->linesize[0] * (avctx->height-1);
  97     picture->linesize[0] *= -1;
  98 }
  99
 100 static int raw_decode(AVCodecContext *avctx,
 101                             void *data, int *data_size,
 102                             const uint8_t *buf, int buf_size)
 103 {
 104     RawVideoContext *context = avctx->priv_data;
 105
 106     AVFrame * frame = (AVFrame *) data;
 107     AVPicture * picture = (AVPicture *) data;
 108
 109     frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
 110     frame->top_field_first = avctx->coded_frame->top_field_first;
 111
 112     //4bpp raw in avi and mov (yes this is ugly ...)
 113     if(avctx->bits_per_coded_sample == 4 && avctx->pix_fmt==PIX_FMT_PAL8 &&
 114        (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
 115         int i;
 116         for(i=256*2; i+1 < context->length>>1; i++){
 117             context->buffer[2*i+0]= buf[i-256*2]>>4;
 118             context->buffer[2*i+1]= buf[i-256*2]&15;
 119         }
 120         buf= context->buffer + 256*4;
 121         buf_size= context->length - 256*4;
 122     }
 123
 124     if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
 125         return -1;
 126
 127     avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
 128     if(avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length){
 129         frame->data[1]= context->buffer;
 130     }
 131     if (avctx->palctrl && avctx->palctrl->palette_changed) {
 132         memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
 133         avctx->palctrl->palette_changed = 0;
 134     }
 135
 136     if(context->flip)
 137         flip(avctx, picture);
 138
 139     if (avctx->codec_tag == MKTAG('Y', 'V', '1', '2'))
 140     {
 141         // swap fields
 142         unsigned char *tmp = picture->data[1];
 143         picture->data[1] = picture->data[2];
 144         picture->data[2] = tmp;
 145     }
 146
 147     *data_size = sizeof(AVPicture);
 148     return buf_size;
 149 }
 150
 151 static av_cold int raw_close_decoder(AVCodecContext *avctx)
 152 {
 153     RawVideoContext *context = avctx->priv_data;
 154
 155     av_freep(&context->buffer);
 156     return 0;
 157 }
 158
 159 AVCodec rawvideo_decoder = {
 160     "rawvideo",
 161     CODEC_TYPE_VIDEO,
 162     CODEC_ID_RAWVIDEO,
 163     sizeof(RawVideoContext),
 164     raw_init_decoder,
 165     NULL,
 166     raw_close_decoder,
 167     raw_decode,
 168     .long_name = NULL_IF_CONFIG_SMALL("raw video"),
 169 };