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libavcodec/rawdec.c

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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 "imgconvert.h"
00029 #include "raw.h"
00030 #include "libavutil/intreadwrite.h"
00031 #include "libavutil/imgutils.h"
00032 #include "libavutil/opt.h"
00033 
00034 typedef struct RawVideoContext {
00035     AVClass *av_class;
00036     uint32_t palette[AVPALETTE_COUNT];
00037     unsigned char * buffer;  /* block of memory for holding one frame */
00038     int             length;  /* number of bytes in buffer */
00039     int flip;
00040     AVFrame pic;             
00041     int tff;
00042 } RawVideoContext;
00043 
00044 static const AVOption options[]={
00045 {"top", "top field first", offsetof(RawVideoContext, tff), FF_OPT_TYPE_INT, {.dbl = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM},
00046 {NULL}
00047 };
00048 static const AVClass class = { "rawdec", NULL, options, LIBAVUTIL_VERSION_INT };
00049 
00050 static const PixelFormatTag pix_fmt_bps_avi[] = {
00051     { PIX_FMT_MONOWHITE, 1 },
00052     { PIX_FMT_PAL8,    2 },
00053     { PIX_FMT_PAL8,    4 },
00054     { PIX_FMT_PAL8,    8 },
00055     { PIX_FMT_RGB444, 12 },
00056     { PIX_FMT_RGB555, 15 },
00057     { PIX_FMT_RGB555, 16 },
00058     { PIX_FMT_BGR24,  24 },
00059     { PIX_FMT_BGRA,   32 },
00060     { PIX_FMT_NONE, 0 },
00061 };
00062 
00063 static const PixelFormatTag pix_fmt_bps_mov[] = {
00064     { PIX_FMT_MONOWHITE, 1 },
00065     { PIX_FMT_PAL8,      2 },
00066     { PIX_FMT_PAL8,      4 },
00067     { PIX_FMT_PAL8,      8 },
00068     // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
00069     // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
00070     { PIX_FMT_RGB555BE, 16 },
00071     { PIX_FMT_RGB24,    24 },
00072     { PIX_FMT_ARGB,     32 },
00073     { PIX_FMT_MONOWHITE,33 },
00074     { PIX_FMT_NONE, 0 },
00075 };
00076 
00077 enum PixelFormat ff_find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)
00078 {
00079     while (tags->pix_fmt >= 0) {
00080         if (tags->fourcc == fourcc)
00081             return tags->pix_fmt;
00082         tags++;
00083     }
00084     return PIX_FMT_YUV420P;
00085 }
00086 
00087 static av_cold int raw_init_decoder(AVCodecContext *avctx)
00088 {
00089     RawVideoContext *context = avctx->priv_data;
00090 
00091     if (avctx->codec_tag == MKTAG('r','a','w',' '))
00092         avctx->pix_fmt = ff_find_pix_fmt(pix_fmt_bps_mov, avctx->bits_per_coded_sample);
00093     else if (avctx->codec_tag == MKTAG('W','R','A','W'))
00094         avctx->pix_fmt = ff_find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
00095     else if (avctx->codec_tag)
00096         avctx->pix_fmt = ff_find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
00097     else if (avctx->pix_fmt == PIX_FMT_NONE && avctx->bits_per_coded_sample)
00098         avctx->pix_fmt = ff_find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
00099 
00100     if (avctx->pix_fmt == PIX_FMT_NONE) {
00101         av_log(avctx, AV_LOG_ERROR, "Pixel format was not specified and cannot be detected\n");
00102         return AVERROR(EINVAL);
00103     }
00104 
00105     ff_set_systematic_pal2(context->palette, avctx->pix_fmt);
00106     context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
00107     if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
00108        avctx->pix_fmt==PIX_FMT_PAL8 &&
00109        (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
00110         context->buffer = av_malloc(context->length);
00111         if (!context->buffer)
00112             return -1;
00113     }
00114     context->pic.pict_type = AV_PICTURE_TYPE_I;
00115     context->pic.key_frame = 1;
00116 
00117     avctx->coded_frame= &context->pic;
00118 
00119     if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
00120         avctx->codec_tag == MKTAG(3, 0, 0, 0) || avctx->codec_tag == MKTAG('W','R','A','W'))
00121         context->flip=1;
00122 
00123     return 0;
00124 }
00125 
00126 static void flip(AVCodecContext *avctx, AVPicture * picture){
00127     picture->data[0] += picture->linesize[0] * (avctx->height-1);
00128     picture->linesize[0] *= -1;
00129 }
00130 
00131 static int raw_decode(AVCodecContext *avctx,
00132                             void *data, int *data_size,
00133                             AVPacket *avpkt)
00134 {
00135     const uint8_t *buf = avpkt->data;
00136     int buf_size = avpkt->size;
00137     RawVideoContext *context = avctx->priv_data;
00138 
00139     AVFrame * frame = (AVFrame *) data;
00140     AVPicture * picture = (AVPicture *) data;
00141 
00142     frame->pict_type        = avctx->coded_frame->pict_type;
00143     frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
00144     frame->top_field_first = avctx->coded_frame->top_field_first;
00145     frame->reordered_opaque = avctx->reordered_opaque;
00146     frame->pkt_pts          = avctx->pkt->pts;
00147     frame->pkt_pos          = avctx->pkt->pos;
00148 
00149     if(context->tff>=0){
00150         frame->interlaced_frame = 1;
00151         frame->top_field_first  = context->tff;
00152     }
00153 
00154     if(buf_size < context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? 256*4 : 0))
00155         return -1;
00156 
00157     //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
00158     if (context->buffer) {
00159         int i;
00160         uint8_t *dst = context->buffer;
00161         buf_size = context->length - 256*4;
00162         if (avctx->bits_per_coded_sample == 4){
00163             for(i=0; 2*i+1 < buf_size; i++){
00164                 dst[2*i+0]= buf[i]>>4;
00165                 dst[2*i+1]= buf[i]&15;
00166             }
00167         } else
00168             for(i=0; 4*i+3 < buf_size; i++){
00169                 dst[4*i+0]= buf[i]>>6;
00170                 dst[4*i+1]= buf[i]>>4&3;
00171                 dst[4*i+2]= buf[i]>>2&3;
00172                 dst[4*i+3]= buf[i]   &3;
00173             }
00174         buf= dst;
00175     }
00176 
00177     if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
00178        avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
00179         buf += buf_size - context->length;
00180 
00181     avpicture_fill(picture, buf, avctx->pix_fmt, avctx->width, avctx->height);
00182     if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
00183        (avctx->pix_fmt!=PIX_FMT_PAL8 &&
00184         (av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PAL))){
00185         frame->data[1]= context->palette;
00186     }
00187     if (avctx->palctrl && avctx->palctrl->palette_changed) {
00188         memcpy(frame->data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
00189         avctx->palctrl->palette_changed = 0;
00190     }
00191     if(avctx->pix_fmt==PIX_FMT_BGR24 && ((frame->linesize[0]+3)&~3)*avctx->height <= buf_size)
00192         frame->linesize[0] = (frame->linesize[0]+3)&~3;
00193 
00194     if(context->flip)
00195         flip(avctx, picture);
00196 
00197     if (   avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
00198         || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
00199         FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
00200 
00201     if(avctx->codec_tag == AV_RL32("yuv2") &&
00202        avctx->pix_fmt   == PIX_FMT_YUYV422) {
00203         int x, y;
00204         uint8_t *line = picture->data[0];
00205         for(y = 0; y < avctx->height; y++) {
00206             for(x = 0; x < avctx->width; x++)
00207                 line[2*x + 1] ^= 0x80;
00208             line += picture->linesize[0];
00209         }
00210     }
00211 
00212     *data_size = sizeof(AVPicture);
00213     return buf_size;
00214 }
00215 
00216 static av_cold int raw_close_decoder(AVCodecContext *avctx)
00217 {
00218     RawVideoContext *context = avctx->priv_data;
00219 
00220     av_freep(&context->buffer);
00221     return 0;
00222 }
00223 
00224 AVCodec ff_rawvideo_decoder = {
00225     "rawvideo",
00226     AVMEDIA_TYPE_VIDEO,
00227     CODEC_ID_RAWVIDEO,
00228     sizeof(RawVideoContext),
00229     raw_init_decoder,
00230     NULL,
00231     raw_close_decoder,
00232     raw_decode,
00233     .long_name = NULL_IF_CONFIG_SMALL("raw video"),
00234     .priv_class= &class,
00235 };

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