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
  24  * Raw Video Decoder
  25  */
  26
  27 #include "avcodec.h"
  28 #include "imgconvert.h"
  29 #include "raw.h"
  30 #include "libavutil/intreadwrite.h"
  31 #include "libavcore/imgutils.h"
  32 #include "libavcore/internal.h"
  33
  34 typedef struct RawVideoContext {
  35     uint32_t palette[AVPALETTE_COUNT];
  36     unsigned char * buffer;  /* block of memory for holding one frame */
  37     int             length;  /* number of bytes in buffer */
  38     int flip;
  39     AVFrame pic;             ///< AVCodecContext.coded_frame
  40 } RawVideoContext;
  41
  42 static const PixelFormatTag pix_fmt_bps_avi[] = {
  43     { PIX_FMT_PAL8,    4 },
  44     { PIX_FMT_PAL8,    8 },
  45     { PIX_FMT_RGB444, 12 },
  46     { PIX_FMT_RGB555, 15 },
  47     { PIX_FMT_RGB555, 16 },
  48     { PIX_FMT_BGR24,  24 },
  49     { PIX_FMT_RGB32,  32 },
  50     { PIX_FMT_NONE, 0 },
  51 };
  52
  53 static const PixelFormatTag pix_fmt_bps_mov[] = {
  54     { PIX_FMT_MONOWHITE, 1 },
  55     { PIX_FMT_PAL8,      2 },
  56     { PIX_FMT_PAL8,      4 },
  57     { PIX_FMT_PAL8,      8 },
  58     // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
  59     // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
  60     { PIX_FMT_RGB555BE, 16 },
  61     { PIX_FMT_RGB24,    24 },
  62     { PIX_FMT_ARGB,     32 },
  63     { PIX_FMT_NONE, 0 },
  64 };
  65
  66 static enum PixelFormat find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)
  67 {
  68     while (tags->pix_fmt >= 0) {
  69         if (tags->fourcc == fourcc)
  70             return tags->pix_fmt;
  71         tags++;
  72     }
  73     return PIX_FMT_YUV420P;
  74 }
  75
  76 static av_cold int raw_init_decoder(AVCodecContext *avctx)
  77 {
  78     RawVideoContext *context = avctx->priv_data;
  79
  80     if (avctx->codec_tag == MKTAG('r','a','w',' '))
  81         avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_mov, avctx->bits_per_coded_sample);
  82     else if (avctx->codec_tag)
  83         avctx->pix_fmt = find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
  84     else if (avctx->pix_fmt == PIX_FMT_NONE && avctx->bits_per_coded_sample)
  85         avctx->pix_fmt = find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
  86
  87     ff_set_systematic_pal2(context->palette, avctx->pix_fmt);
  88     context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
  89     if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
  90        avctx->pix_fmt==PIX_FMT_PAL8 &&
  91        (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
  92         context->buffer = av_malloc(context->length);
  93         if (!context->buffer)
  94             return -1;
  95     }
  96     context->pic.pict_type = FF_I_TYPE;
  97     context->pic.key_frame = 1;
  98
  99     avctx->coded_frame= &context->pic;
 100
 101     if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
 102        avctx->codec_tag == MKTAG( 3 ,  0 ,  0 ,  0 ))
 103         context->flip=1;
 104
 105     return 0;
 106 }
 107
 108 static void flip(AVCodecContext *avctx, AVPicture * picture){
 109     picture->data[0] += picture->linesize[0] * (avctx->height-1);
 110     picture->linesize[0] *= -1;
 111 }
 112
 113 static int raw_decode(AVCodecContext *avctx,
 114                             void *data, int *data_size,
 115                             AVPacket *avpkt)
 116 {
 117     const uint8_t *buf = avpkt->data;
 118     int buf_size = avpkt->size;
 119     RawVideoContext *context = avctx->priv_data;
 120
 121     AVFrame * frame = (AVFrame *) data;
 122     AVPicture * picture = (AVPicture *) data;
 123
 124     frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
 125     frame->top_field_first = avctx->coded_frame->top_field_first;
 126     frame->reordered_opaque = avctx->reordered_opaque;
 127
 128     //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
 129     if (context->buffer) {
 130         int i;
 131         uint8_t *dst = context->buffer;
 132         buf_size = context->length - 256*4;
 133         if (avctx->bits_per_coded_sample == 4){
 134             for(i=0; 2*i+1 < buf_size; i++){
 135                 dst[2*i+0]= buf[i]>>4;
 136                 dst[2*i+1]= buf[i]&15;
 137             }
 138         } else
 139             for(i=0; 4*i+3 < buf_size; i++){
 140                 dst[4*i+0]= buf[i]>>6;
 141                 dst[4*i+1]= buf[i]>>4&3;
 142                 dst[4*i+2]= buf[i]>>2&3;
 143                 dst[4*i+3]= buf[i]   &3;
 144             }
 145         buf= dst;
 146     }
 147
 148     if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
 149        avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
 150         buf += buf_size - context->length;
 151
 152     if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
 153         return -1;
 154
 155     avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
 156     if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
 157        (avctx->pix_fmt!=PIX_FMT_PAL8 &&
 158         (av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PAL))){
 159         frame->data[1]= context->palette;
 160     }
 161     if (avctx->palctrl && avctx->palctrl->palette_changed) {
 162         memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
 163         avctx->palctrl->palette_changed = 0;
 164     }
 165     if(avctx->pix_fmt==PIX_FMT_BGR24 && ((frame->linesize[0]+3)&~3)*avctx->height <= buf_size)
 166         frame->linesize[0] = (frame->linesize[0]+3)&~3;
 167
 168     if(context->flip)
 169         flip(avctx, picture);
 170
 171     if (   avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
 172         || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
 173         FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
 174
 175     if(avctx->codec_tag == AV_RL32("yuv2") &&
 176        avctx->pix_fmt   == PIX_FMT_YUYV422) {
 177         int x, y;
 178         uint8_t *line = picture->data[0];
 179         for(y = 0; y < avctx->height; y++) {
 180             for(x = 0; x < avctx->width; x++)
 181                 line[2*x + 1] ^= 0x80;
 182             line += picture->linesize[0];
 183         }
 184     }
 185
 186     *data_size = sizeof(AVPicture);
 187     return buf_size;
 188 }
 189
 190 static av_cold int raw_close_decoder(AVCodecContext *avctx)
 191 {
 192     RawVideoContext *context = avctx->priv_data;
 193
 194     av_freep(&context->buffer);
 195     return 0;
 196 }
 197
 198 AVCodec ff_rawvideo_decoder = {
 199     "rawvideo",
 200     AVMEDIA_TYPE_VIDEO,
 201     CODEC_ID_RAWVIDEO,
 202     sizeof(RawVideoContext),
 203     raw_init_decoder,
 204     NULL,
 205     raw_close_decoder,
 206     raw_decode,
 207     .long_name = NULL_IF_CONFIG_SMALL("raw video"),
 208 };