FFmpeg: libavcodec/roqvideodec.c Source File

00001 /*
00002  * Copyright (C) 2003 the ffmpeg project
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00028 #include <stdio.h>
00029 #include <stdlib.h>
00030 #include <string.h>
00031 
00032 #include "avcodec.h"
00033 #include "bytestream.h"
00034 #include "roqvideo.h"
00035 
00036 static void roqvideo_decode_frame(RoqContext *ri)
00037 {
00038     unsigned int chunk_id = 0, chunk_arg = 0;
00039     unsigned long chunk_size = 0;
00040     int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
00041     int vqid, xpos, ypos, xp, yp, x, y, mx, my;
00042     int frame_stats[2][4] = {{0},{0}};
00043     roq_qcell *qcell;
00044     int64_t chunk_start;
00045 
00046     while (bytestream2_get_bytes_left(&ri->gb) >= 8) {
00047         chunk_id   = bytestream2_get_le16(&ri->gb);
00048         chunk_size = bytestream2_get_le32(&ri->gb);
00049         chunk_arg  = bytestream2_get_le16(&ri->gb);
00050 
00051         if(chunk_id == RoQ_QUAD_VQ)
00052             break;
00053         if(chunk_id == RoQ_QUAD_CODEBOOK) {
00054             if((nv1 = chunk_arg >> 8) == 0)
00055                 nv1 = 256;
00056             if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
00057                 nv2 = 256;
00058             for(i = 0; i < nv1; i++) {
00059                 ri->cb2x2[i].y[0] = bytestream2_get_byte(&ri->gb);
00060                 ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
00061                 ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
00062                 ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
00063                 ri->cb2x2[i].u    = bytestream2_get_byte(&ri->gb);
00064                 ri->cb2x2[i].v    = bytestream2_get_byte(&ri->gb);
00065             }
00066             for(i = 0; i < nv2; i++)
00067                 for(j = 0; j < 4; j++)
00068                     ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
00069         }
00070     }
00071 
00072     chunk_start = bytestream2_tell(&ri->gb);
00073     xpos = ypos = 0;
00074 
00075     if (chunk_size > bytestream2_get_bytes_left(&ri->gb)) {
00076         av_log(ri->avctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n");
00077         chunk_size = bytestream2_get_bytes_left(&ri->gb);
00078     }
00079 
00080     while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
00081         for (yp = ypos; yp < ypos + 16; yp += 8)
00082             for (xp = xpos; xp < xpos + 16; xp += 8) {
00083                 if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
00084                     av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
00085                     return;
00086                 }
00087                 if (vqflg_pos < 0) {
00088                     vqflg = bytestream2_get_le16(&ri->gb);
00089                     vqflg_pos = 7;
00090                 }
00091                 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
00092                 frame_stats[0][vqid]++;
00093                 vqflg_pos--;
00094 
00095                 switch(vqid) {
00096                 case RoQ_ID_MOT:
00097                     break;
00098                 case RoQ_ID_FCC: {
00099                     int byte = bytestream2_get_byte(&ri->gb);
00100                     mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
00101                     my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
00102                     ff_apply_motion_8x8(ri, xp, yp, mx, my);
00103                     break;
00104                 }
00105                 case RoQ_ID_SLD:
00106                     qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
00107                     ff_apply_vector_4x4(ri, xp,     yp,     ri->cb2x2 + qcell->idx[0]);
00108                     ff_apply_vector_4x4(ri, xp + 4, yp,     ri->cb2x2 + qcell->idx[1]);
00109                     ff_apply_vector_4x4(ri, xp,     yp + 4, ri->cb2x2 + qcell->idx[2]);
00110                     ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
00111                     break;
00112                 case RoQ_ID_CCC:
00113                     for (k = 0; k < 4; k++) {
00114                         x = xp; y = yp;
00115                         if(k & 0x01) x += 4;
00116                         if(k & 0x02) y += 4;
00117 
00118                         if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
00119                             av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
00120                             return;
00121                         }
00122                         if (vqflg_pos < 0) {
00123                             vqflg = bytestream2_get_le16(&ri->gb);
00124                             vqflg_pos = 7;
00125                         }
00126                         vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
00127                         frame_stats[1][vqid]++;
00128                         vqflg_pos--;
00129                         switch(vqid) {
00130                         case RoQ_ID_MOT:
00131                             break;
00132                         case RoQ_ID_FCC: {
00133                             int byte = bytestream2_get_byte(&ri->gb);
00134                             mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
00135                             my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
00136                             ff_apply_motion_4x4(ri, x, y, mx, my);
00137                             break;
00138                         }
00139                         case RoQ_ID_SLD:
00140                             qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
00141                             ff_apply_vector_2x2(ri, x,     y,     ri->cb2x2 + qcell->idx[0]);
00142                             ff_apply_vector_2x2(ri, x + 2, y,     ri->cb2x2 + qcell->idx[1]);
00143                             ff_apply_vector_2x2(ri, x,     y + 2, ri->cb2x2 + qcell->idx[2]);
00144                             ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
00145                             break;
00146                         case RoQ_ID_CCC:
00147                             ff_apply_vector_2x2(ri, x,     y,     ri->cb2x2 + bytestream2_get_byte(&ri->gb));
00148                             ff_apply_vector_2x2(ri, x + 2, y,     ri->cb2x2 + bytestream2_get_byte(&ri->gb));
00149                             ff_apply_vector_2x2(ri, x,     y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
00150                             ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
00151                             break;
00152                         }
00153                     }
00154                     break;
00155                 default:
00156                     av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
00157             }
00158         }
00159 
00160         xpos += 16;
00161         if (xpos >= ri->width) {
00162             xpos -= ri->width;
00163             ypos += 16;
00164         }
00165         if(ypos >= ri->height)
00166             break;
00167     }
00168 }
00169 
00170 
00171 static av_cold int roq_decode_init(AVCodecContext *avctx)
00172 {
00173     RoqContext *s = avctx->priv_data;
00174 
00175     s->avctx = avctx;
00176     s->width = avctx->width;
00177     s->height = avctx->height;
00178     avcodec_get_frame_defaults(&s->frames[0]);
00179     avcodec_get_frame_defaults(&s->frames[1]);
00180     s->last_frame    = &s->frames[0];
00181     s->current_frame = &s->frames[1];
00182     avctx->pix_fmt = PIX_FMT_YUV444P;
00183 
00184     return 0;
00185 }
00186 
00187 static int roq_decode_frame(AVCodecContext *avctx,
00188                             void *data, int *data_size,
00189                             AVPacket *avpkt)
00190 {
00191     const uint8_t *buf = avpkt->data;
00192     int buf_size = avpkt->size;
00193     RoqContext *s = avctx->priv_data;
00194     int copy= !s->current_frame->data[0];
00195 
00196     s->current_frame->reference = 3;
00197     if (avctx->reget_buffer(avctx, s->current_frame)) {
00198         av_log(avctx, AV_LOG_ERROR, "  RoQ: get_buffer() failed\n");
00199         return -1;
00200     }
00201 
00202     if(copy)
00203         av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
00204                         avctx->pix_fmt, avctx->width, avctx->height);
00205 
00206     bytestream2_init(&s->gb, buf, buf_size);
00207     roqvideo_decode_frame(s);
00208 
00209     *data_size = sizeof(AVFrame);
00210     *(AVFrame*)data = *s->current_frame;
00211 
00212     /* shuffle frames */
00213     FFSWAP(AVFrame *, s->current_frame, s->last_frame);
00214 
00215     return buf_size;
00216 }
00217 
00218 static av_cold int roq_decode_end(AVCodecContext *avctx)
00219 {
00220     RoqContext *s = avctx->priv_data;
00221 
00222     /* release the last frame */
00223     if (s->last_frame->data[0])
00224         avctx->release_buffer(avctx, s->last_frame);
00225     if (s->current_frame->data[0])
00226         avctx->release_buffer(avctx, s->current_frame);
00227 
00228     return 0;
00229 }
00230 
00231 AVCodec ff_roq_decoder = {
00232     .name           = "roqvideo",
00233     .type           = AVMEDIA_TYPE_VIDEO,
00234     .id             = CODEC_ID_ROQ,
00235     .priv_data_size = sizeof(RoqContext),
00236     .init           = roq_decode_init,
00237     .close          = roq_decode_end,
00238     .decode         = roq_decode_frame,
00239     .capabilities   = CODEC_CAP_DR1,
00240     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ video"),
00241 };