yading@10: /*
yading@10:  * Copyright (C) 2003 the ffmpeg project
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * id RoQ Video Decoder by Dr. Tim Ferguson
yading@10:  * For more information about the id RoQ format, visit:
yading@10:  *   http://www.csse.monash.edu.au/~timf/
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: #include "roqvideo.h"
yading@10: 
yading@10: static void roqvideo_decode_frame(RoqContext *ri)
yading@10: {
yading@10:     unsigned int chunk_id = 0, chunk_arg = 0;
yading@10:     unsigned long chunk_size = 0;
yading@10:     int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
yading@10:     int vqid, xpos, ypos, xp, yp, x, y, mx, my;
yading@10:     int frame_stats[2][4] = {{0},{0}};
yading@10:     roq_qcell *qcell;
yading@10:     int64_t chunk_start;
yading@10: 
yading@10:     while (bytestream2_get_bytes_left(&ri->gb) >= 8) {
yading@10:         chunk_id   = bytestream2_get_le16(&ri->gb);
yading@10:         chunk_size = bytestream2_get_le32(&ri->gb);
yading@10:         chunk_arg  = bytestream2_get_le16(&ri->gb);
yading@10: 
yading@10:         if(chunk_id == RoQ_QUAD_VQ)
yading@10:             break;
yading@10:         if(chunk_id == RoQ_QUAD_CODEBOOK) {
yading@10:             if((nv1 = chunk_arg >> 8) == 0)
yading@10:                 nv1 = 256;
yading@10:             if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
yading@10:                 nv2 = 256;
yading@10:             for(i = 0; i < nv1; i++) {
yading@10:                 ri->cb2x2[i].y[0] = bytestream2_get_byte(&ri->gb);
yading@10:                 ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
yading@10:                 ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
yading@10:                 ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
yading@10:                 ri->cb2x2[i].u    = bytestream2_get_byte(&ri->gb);
yading@10:                 ri->cb2x2[i].v    = bytestream2_get_byte(&ri->gb);
yading@10:             }
yading@10:             for(i = 0; i < nv2; i++)
yading@10:                 for(j = 0; j < 4; j++)
yading@10:                     ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     chunk_start = bytestream2_tell(&ri->gb);
yading@10:     xpos = ypos = 0;
yading@10: 
yading@10:     if (chunk_size > bytestream2_get_bytes_left(&ri->gb)) {
yading@10:         av_log(ri->avctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n");
yading@10:         chunk_size = bytestream2_get_bytes_left(&ri->gb);
yading@10:     }
yading@10: 
yading@10:     while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
yading@10:         for (yp = ypos; yp < ypos + 16; yp += 8)
yading@10:             for (xp = xpos; xp < xpos + 16; xp += 8) {
yading@10:                 if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
yading@10:                     av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
yading@10:                     return;
yading@10:                 }
yading@10:                 if (vqflg_pos < 0) {
yading@10:                     vqflg = bytestream2_get_le16(&ri->gb);
yading@10:                     vqflg_pos = 7;
yading@10:                 }
yading@10:                 vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
yading@10:                 frame_stats[0][vqid]++;
yading@10:                 vqflg_pos--;
yading@10: 
yading@10:                 switch(vqid) {
yading@10:                 case RoQ_ID_MOT:
yading@10:                     break;
yading@10:                 case RoQ_ID_FCC: {
yading@10:                     int byte = bytestream2_get_byte(&ri->gb);
yading@10:                     mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
yading@10:                     my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
yading@10:                     ff_apply_motion_8x8(ri, xp, yp, mx, my);
yading@10:                     break;
yading@10:                 }
yading@10:                 case RoQ_ID_SLD:
yading@10:                     qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
yading@10:                     ff_apply_vector_4x4(ri, xp,     yp,     ri->cb2x2 + qcell->idx[0]);
yading@10:                     ff_apply_vector_4x4(ri, xp + 4, yp,     ri->cb2x2 + qcell->idx[1]);
yading@10:                     ff_apply_vector_4x4(ri, xp,     yp + 4, ri->cb2x2 + qcell->idx[2]);
yading@10:                     ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
yading@10:                     break;
yading@10:                 case RoQ_ID_CCC:
yading@10:                     for (k = 0; k < 4; k++) {
yading@10:                         x = xp; y = yp;
yading@10:                         if(k & 0x01) x += 4;
yading@10:                         if(k & 0x02) y += 4;
yading@10: 
yading@10:                         if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
yading@10:                             av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
yading@10:                             return;
yading@10:                         }
yading@10:                         if (vqflg_pos < 0) {
yading@10:                             vqflg = bytestream2_get_le16(&ri->gb);
yading@10:                             vqflg_pos = 7;
yading@10:                         }
yading@10:                         vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
yading@10:                         frame_stats[1][vqid]++;
yading@10:                         vqflg_pos--;
yading@10:                         switch(vqid) {
yading@10:                         case RoQ_ID_MOT:
yading@10:                             break;
yading@10:                         case RoQ_ID_FCC: {
yading@10:                             int byte = bytestream2_get_byte(&ri->gb);
yading@10:                             mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
yading@10:                             my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
yading@10:                             ff_apply_motion_4x4(ri, x, y, mx, my);
yading@10:                             break;
yading@10:                         }
yading@10:                         case RoQ_ID_SLD:
yading@10:                             qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
yading@10:                             ff_apply_vector_2x2(ri, x,     y,     ri->cb2x2 + qcell->idx[0]);
yading@10:                             ff_apply_vector_2x2(ri, x + 2, y,     ri->cb2x2 + qcell->idx[1]);
yading@10:                             ff_apply_vector_2x2(ri, x,     y + 2, ri->cb2x2 + qcell->idx[2]);
yading@10:                             ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
yading@10:                             break;
yading@10:                         case RoQ_ID_CCC:
yading@10:                             ff_apply_vector_2x2(ri, x,     y,     ri->cb2x2 + bytestream2_get_byte(&ri->gb));
yading@10:                             ff_apply_vector_2x2(ri, x + 2, y,     ri->cb2x2 + bytestream2_get_byte(&ri->gb));
yading@10:                             ff_apply_vector_2x2(ri, x,     y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
yading@10:                             ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
yading@10:                             break;
yading@10:                         }
yading@10:                     }
yading@10:                     break;
yading@10:                 default:
yading@10:                     av_assert2(0);
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         xpos += 16;
yading@10:         if (xpos >= ri->width) {
yading@10:             xpos -= ri->width;
yading@10:             ypos += 16;
yading@10:         }
yading@10:         if(ypos >= ri->height)
yading@10:             break;
yading@10:     }
yading@10: }
yading@10: 
yading@10: 
yading@10: static av_cold int roq_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     RoqContext *s = avctx->priv_data;
yading@10: 
yading@10:     s->avctx = avctx;
yading@10: 
yading@10:     if (avctx->width % 16 || avctx->height % 16) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Dimensions must be a multiple of 16\n");
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     s->width = avctx->width;
yading@10:     s->height = avctx->height;
yading@10: 
yading@10:     s->last_frame    = av_frame_alloc();
yading@10:     s->current_frame = av_frame_alloc();
yading@10:     if (!s->current_frame || !s->last_frame) {
yading@10:         av_frame_free(&s->current_frame);
yading@10:         av_frame_free(&s->last_frame);
yading@10:         return AVERROR(ENOMEM);
yading@10:     }
yading@10: 
yading@10:     avctx->pix_fmt = AV_PIX_FMT_YUV444P;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int roq_decode_frame(AVCodecContext *avctx,
yading@10:                             void *data, int *got_frame,
yading@10:                             AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     RoqContext *s = avctx->priv_data;
yading@10:     int copy= !s->current_frame->data[0];
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if(copy)
yading@10:         av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
yading@10:                         avctx->pix_fmt, avctx->width, avctx->height);
yading@10: 
yading@10:     bytestream2_init(&s->gb, buf, buf_size);
yading@10:     roqvideo_decode_frame(s);
yading@10: 
yading@10:     if ((ret = av_frame_ref(data, s->current_frame)) < 0)
yading@10:         return ret;
yading@10:     *got_frame      = 1;
yading@10: 
yading@10:     /* shuffle frames */
yading@10:     FFSWAP(AVFrame *, s->current_frame, s->last_frame);
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int roq_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     RoqContext *s = avctx->priv_data;
yading@10: 
yading@10:     av_frame_free(&s->current_frame);
yading@10:     av_frame_free(&s->last_frame);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_roq_decoder = {
yading@10:     .name           = "roqvideo",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_ROQ,
yading@10:     .priv_data_size = sizeof(RoqContext),
yading@10:     .init           = roq_decode_init,
yading@10:     .close          = roq_decode_end,
yading@10:     .decode         = roq_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("id RoQ video"),
yading@10: };