FFmpeg: libavcodec/rawdec.c Source File

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/avassert.h"
00031 #include "libavutil/common.h"
00032 #include "libavutil/intreadwrite.h"
00033 #include "libavutil/imgutils.h"
00034 #include "libavutil/opt.h"
00035 
00036 typedef struct RawVideoContext {
00037     AVClass *av_class;
00038     uint32_t palette[AVPALETTE_COUNT];
00039     unsigned char * buffer;  /* block of memory for holding one frame */
00040     int             length;  /* number of bytes in buffer */
00041     int flip;
00042     AVFrame pic;             
00043     int tff;
00044 } RawVideoContext;
00045 
00046 static const AVOption options[]={
00047 {"top", "top field first", offsetof(RawVideoContext, tff), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM|AV_OPT_FLAG_VIDEO_PARAM},
00048 {NULL}
00049 };
00050 
00051 static const AVClass class = {
00052     .class_name = "rawdec",
00053     .option     = options,
00054     .version    = LIBAVUTIL_VERSION_INT,
00055 };
00056 
00057 static const PixelFormatTag pix_fmt_bps_avi[] = {
00058     { PIX_FMT_MONOWHITE, 1 },
00059     { PIX_FMT_PAL8,    2 },
00060     { PIX_FMT_PAL8,    4 },
00061     { PIX_FMT_PAL8,    8 },
00062     { PIX_FMT_RGB444, 12 },
00063     { PIX_FMT_RGB555, 15 },
00064     { PIX_FMT_RGB555, 16 },
00065     { PIX_FMT_BGR24,  24 },
00066     { PIX_FMT_BGRA,   32 },
00067     { PIX_FMT_NONE, 0 },
00068 };
00069 
00070 static const PixelFormatTag pix_fmt_bps_mov[] = {
00071     { PIX_FMT_MONOWHITE, 1 },
00072     { PIX_FMT_PAL8,      2 },
00073     { PIX_FMT_PAL8,      4 },
00074     { PIX_FMT_PAL8,      8 },
00075     // FIXME swscale does not support 16 bit in .mov, sample 16bit.mov
00076     // http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/qtff3.html
00077     { PIX_FMT_RGB555BE, 16 },
00078     { PIX_FMT_RGB24,    24 },
00079     { PIX_FMT_ARGB,     32 },
00080     { PIX_FMT_MONOWHITE,33 },
00081     { PIX_FMT_NONE, 0 },
00082 };
00083 
00084 enum PixelFormat ff_find_pix_fmt(const PixelFormatTag *tags, unsigned int fourcc)
00085 {
00086     while (tags->pix_fmt >= 0) {
00087         if (tags->fourcc == fourcc)
00088             return tags->pix_fmt;
00089         tags++;
00090     }
00091     return PIX_FMT_YUV420P;
00092 }
00093 
00094 static av_cold int raw_init_decoder(AVCodecContext *avctx)
00095 {
00096     RawVideoContext *context = avctx->priv_data;
00097 
00098     if (avctx->codec_tag == MKTAG('r','a','w',' ') || avctx->codec_tag == MKTAG('N','O','1','6'))
00099         avctx->pix_fmt = ff_find_pix_fmt(pix_fmt_bps_mov, avctx->bits_per_coded_sample);
00100     else if (avctx->codec_tag == MKTAG('W','R','A','W'))
00101         avctx->pix_fmt = ff_find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
00102     else if (avctx->codec_tag)
00103         avctx->pix_fmt = ff_find_pix_fmt(ff_raw_pix_fmt_tags, avctx->codec_tag);
00104     else if (avctx->pix_fmt == PIX_FMT_NONE && avctx->bits_per_coded_sample)
00105         avctx->pix_fmt = ff_find_pix_fmt(pix_fmt_bps_avi, avctx->bits_per_coded_sample);
00106 
00107     if (avctx->pix_fmt == PIX_FMT_NONE) {
00108         av_log(avctx, AV_LOG_ERROR, "Pixel format was not specified and cannot be detected\n");
00109         return AVERROR(EINVAL);
00110     }
00111 
00112     ff_set_systematic_pal2(context->palette, avctx->pix_fmt);
00113     if((avctx->bits_per_coded_sample == 4 || avctx->bits_per_coded_sample == 2) &&
00114        avctx->pix_fmt==PIX_FMT_PAL8 &&
00115        (!avctx->codec_tag || avctx->codec_tag == MKTAG('r','a','w',' '))){
00116         context->length = avpicture_get_size(avctx->pix_fmt, FFALIGN(avctx->width, 16), avctx->height);
00117         context->buffer = av_malloc(context->length);
00118         if (!context->buffer)
00119             return AVERROR(ENOMEM);
00120     } else {
00121         context->length = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
00122     }
00123     context->pic.pict_type = AV_PICTURE_TYPE_I;
00124     context->pic.key_frame = 1;
00125 
00126     avctx->coded_frame= &context->pic;
00127 
00128     if((avctx->extradata_size >= 9 && !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9)) ||
00129         avctx->codec_tag == MKTAG('c','y','u','v') ||
00130         avctx->codec_tag == MKTAG(3, 0, 0, 0) || avctx->codec_tag == MKTAG('W','R','A','W'))
00131         context->flip=1;
00132 
00133     return 0;
00134 }
00135 
00136 static void flip(AVCodecContext *avctx, AVPicture * picture){
00137     picture->data[0] += picture->linesize[0] * (avctx->height-1);
00138     picture->linesize[0] *= -1;
00139 }
00140 
00141 static int raw_decode(AVCodecContext *avctx,
00142                             void *data, int *data_size,
00143                             AVPacket *avpkt)
00144 {
00145     const uint8_t *buf = avpkt->data;
00146     int buf_size = avpkt->size;
00147     int linesize_align = 4;
00148     RawVideoContext *context = avctx->priv_data;
00149     int res, len;
00150 
00151     AVFrame   *frame   = data;
00152     AVPicture *picture = data;
00153 
00154     frame->pict_type        = avctx->coded_frame->pict_type;
00155     frame->interlaced_frame = avctx->coded_frame->interlaced_frame;
00156     frame->top_field_first = avctx->coded_frame->top_field_first;
00157     frame->reordered_opaque = avctx->reordered_opaque;
00158     frame->pkt_pts          = avctx->pkt->pts;
00159     frame->pkt_pos          = avctx->pkt->pos;
00160     frame->pkt_duration     = avctx->pkt->duration;
00161 
00162     if(context->tff>=0){
00163         frame->interlaced_frame = 1;
00164         frame->top_field_first  = context->tff;
00165     }
00166 
00167     if (avctx->width <= 0 || avctx->height <= 0) {
00168         av_log(avctx, AV_LOG_ERROR, "w/h is invalid\n");
00169         return AVERROR(EINVAL);
00170     }
00171 
00172     //2bpp and 4bpp raw in avi and mov (yes this is ugly ...)
00173     if (context->buffer) {
00174         int i;
00175         uint8_t *dst = context->buffer;
00176         buf_size = context->length - AVPALETTE_SIZE;
00177         if (avctx->bits_per_coded_sample == 4){
00178             for(i=0; 2*i+1 < buf_size && i<avpkt->size; i++){
00179                 dst[2*i+0]= buf[i]>>4;
00180                 dst[2*i+1]= buf[i]&15;
00181             }
00182             linesize_align = 8;
00183         } else {
00184             av_assert0(avctx->bits_per_coded_sample == 2);
00185             for(i=0; 4*i+3 < buf_size && i<avpkt->size; i++){
00186                 dst[4*i+0]= buf[i]>>6;
00187                 dst[4*i+1]= buf[i]>>4&3;
00188                 dst[4*i+2]= buf[i]>>2&3;
00189                 dst[4*i+3]= buf[i]   &3;
00190             }
00191             linesize_align = 16;
00192         }
00193         buf= dst;
00194     }
00195 
00196     if(avctx->codec_tag == MKTAG('A', 'V', '1', 'x') ||
00197        avctx->codec_tag == MKTAG('A', 'V', 'u', 'p'))
00198         buf += buf_size - context->length;
00199 
00200     len = context->length - (avctx->pix_fmt==PIX_FMT_PAL8 ? AVPALETTE_SIZE : 0);
00201     if (buf_size < len) {
00202         av_log(avctx, AV_LOG_ERROR, "Invalid buffer size, packet size %d < expected length %d\n", buf_size, len);
00203         return AVERROR(EINVAL);
00204     }
00205 
00206     if ((res = avpicture_fill(picture, buf, avctx->pix_fmt,
00207                               avctx->width, avctx->height)) < 0)
00208         return res;
00209     if((avctx->pix_fmt==PIX_FMT_PAL8 && buf_size < context->length) ||
00210        (av_pix_fmt_descriptors[avctx->pix_fmt].flags & PIX_FMT_PSEUDOPAL)) {
00211         frame->data[1]= (uint8_t*)context->palette;
00212     }
00213     if (avctx->pix_fmt == PIX_FMT_PAL8) {
00214         const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
00215 
00216         if (pal) {
00217             memcpy(frame->data[1], pal, AVPALETTE_SIZE);
00218             frame->palette_has_changed = 1;
00219         }
00220     }
00221     if((avctx->pix_fmt==PIX_FMT_BGR24    ||
00222         avctx->pix_fmt==PIX_FMT_GRAY8    ||
00223         avctx->pix_fmt==PIX_FMT_RGB555LE ||
00224         avctx->pix_fmt==PIX_FMT_RGB555BE ||
00225         avctx->pix_fmt==PIX_FMT_RGB565LE ||
00226         avctx->pix_fmt==PIX_FMT_MONOWHITE ||
00227         avctx->pix_fmt==PIX_FMT_PAL8) &&
00228         FFALIGN(frame->linesize[0], linesize_align)*avctx->height <= buf_size)
00229         frame->linesize[0] = FFALIGN(frame->linesize[0], linesize_align);
00230 
00231     if(context->flip)
00232         flip(avctx, picture);
00233 
00234     if (   avctx->codec_tag == MKTAG('Y', 'V', '1', '2')
00235         || avctx->codec_tag == MKTAG('Y', 'V', '1', '6')
00236         || avctx->codec_tag == MKTAG('Y', 'V', '2', '4')
00237         || avctx->codec_tag == MKTAG('Y', 'V', 'U', '9'))
00238         FFSWAP(uint8_t *, picture->data[1], picture->data[2]);
00239 
00240     if(avctx->codec_tag == AV_RL32("yuv2") &&
00241        avctx->pix_fmt   == PIX_FMT_YUYV422) {
00242         int x, y;
00243         uint8_t *line = picture->data[0];
00244         for(y = 0; y < avctx->height; y++) {
00245             for(x = 0; x < avctx->width; x++)
00246                 line[2*x + 1] ^= 0x80;
00247             line += picture->linesize[0];
00248         }
00249     }
00250     if(avctx->codec_tag == AV_RL32("YVYU") &&
00251        avctx->pix_fmt   == PIX_FMT_YUYV422) {
00252         int x, y;
00253         uint8_t *line = picture->data[0];
00254         for(y = 0; y < avctx->height; y++) {
00255             for(x = 0; x < avctx->width - 1; x += 2)
00256                 FFSWAP(uint8_t, line[2*x + 1], line[2*x + 3]);
00257             line += picture->linesize[0];
00258         }
00259     }
00260 
00261     *data_size = sizeof(AVPicture);
00262     return buf_size;
00263 }
00264 
00265 static av_cold int raw_close_decoder(AVCodecContext *avctx)
00266 {
00267     RawVideoContext *context = avctx->priv_data;
00268 
00269     av_freep(&context->buffer);
00270     return 0;
00271 }
00272 
00273 AVCodec ff_rawvideo_decoder = {
00274     .name           = "rawvideo",
00275     .type           = AVMEDIA_TYPE_VIDEO,
00276     .id             = AV_CODEC_ID_RAWVIDEO,
00277     .priv_data_size = sizeof(RawVideoContext),
00278     .init           = raw_init_decoder,
00279     .close          = raw_close_decoder,
00280     .decode         = raw_decode,
00281     .long_name      = NULL_IF_CONFIG_SMALL("raw video"),
00282     .priv_class     = &class,
00283 };