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ffmpeg / libavcodec / roqvideodec.c @ 2912e87a

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/*
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 * Copyright (C) 2003 the ffmpeg project
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * id RoQ Video Decoder by Dr. Tim Ferguson
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 * For more information about the id RoQ format, visit:
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 *   http://www.csse.monash.edu.au/~timf/
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avcodec.h"
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#include "bytestream.h"
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#include "roqvideo.h"
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static void roqvideo_decode_frame(RoqContext *ri)
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{
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    unsigned int chunk_id = 0, chunk_arg = 0;
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    unsigned long chunk_size = 0;
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    int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
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    int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
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    int frame_stats[2][4] = {{0},{0}};
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    roq_qcell *qcell;
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    const unsigned char *buf = ri->buf;
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    const unsigned char *buf_end = ri->buf + ri->size;
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    while (buf < buf_end) {
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        chunk_id = bytestream_get_le16(&buf);
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        chunk_size = bytestream_get_le32(&buf);
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        chunk_arg = bytestream_get_le16(&buf);
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        if(chunk_id == RoQ_QUAD_VQ)
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            break;
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        if(chunk_id == RoQ_QUAD_CODEBOOK) {
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            if((nv1 = chunk_arg >> 8) == 0)
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                nv1 = 256;
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            if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
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                nv2 = 256;
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            for(i = 0; i < nv1; i++) {
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                ri->cb2x2[i].y[0] = *buf++;
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                ri->cb2x2[i].y[1] = *buf++;
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                ri->cb2x2[i].y[2] = *buf++;
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                ri->cb2x2[i].y[3] = *buf++;
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                ri->cb2x2[i].u = *buf++;
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                ri->cb2x2[i].v = *buf++;
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            }
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            for(i = 0; i < nv2; i++)
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                for(j = 0; j < 4; j++)
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                    ri->cb4x4[i].idx[j] = *buf++;
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        }
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    }
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    bpos = xpos = ypos = 0;
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    while(bpos < chunk_size) {
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        for (yp = ypos; yp < ypos + 16; yp += 8)
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            for (xp = xpos; xp < xpos + 16; xp += 8) {
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                if (vqflg_pos < 0) {
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                    vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
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                    vqflg_pos = 7;
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                }
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                vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
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                frame_stats[0][vqid]++;
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                vqflg_pos--;
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                switch(vqid) {
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                case RoQ_ID_MOT:
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                    break;
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                case RoQ_ID_FCC:
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                    mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
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                    my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
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                    ff_apply_motion_8x8(ri, xp, yp, mx, my);
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                    break;
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                case RoQ_ID_SLD:
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                    qcell = ri->cb4x4 + buf[bpos++];
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                    ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
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                    ff_apply_vector_4x4(ri, xp+4, yp, ri->cb2x2 + qcell->idx[1]);
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                    ff_apply_vector_4x4(ri, xp, yp+4, ri->cb2x2 + qcell->idx[2]);
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                    ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cb2x2 + qcell->idx[3]);
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                    break;
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                case RoQ_ID_CCC:
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                    for (k = 0; k < 4; k++) {
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                        x = xp; y = yp;
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                        if(k & 0x01) x += 4;
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                        if(k & 0x02) y += 4;
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                        if (vqflg_pos < 0) {
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                            vqflg = buf[bpos++];
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                            vqflg |= (buf[bpos++] << 8);
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                            vqflg_pos = 7;
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                        }
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                        vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
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                        frame_stats[1][vqid]++;
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                        vqflg_pos--;
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                        switch(vqid) {
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                        case RoQ_ID_MOT:
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                            break;
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                        case RoQ_ID_FCC:
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                            mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
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                            my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
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                            ff_apply_motion_4x4(ri, x, y, mx, my);
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                            break;
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                        case RoQ_ID_SLD:
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                            qcell = ri->cb4x4 + buf[bpos++];
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                            ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
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                            ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + qcell->idx[1]);
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                            ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + qcell->idx[2]);
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                            ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + qcell->idx[3]);
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                            break;
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                        case RoQ_ID_CCC:
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                            ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + buf[bpos]);
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                            ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + buf[bpos+1]);
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                            ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + buf[bpos+2]);
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                            ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + buf[bpos+3]);
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                            bpos += 4;
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                            break;
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                        }
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                    }
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                    break;
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                default:
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                    av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
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            }
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        }
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        xpos += 16;
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        if (xpos >= ri->width) {
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            xpos -= ri->width;
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            ypos += 16;
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        }
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        if(ypos >= ri->height)
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            break;
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    }
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}
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static av_cold int roq_decode_init(AVCodecContext *avctx)
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{
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    RoqContext *s = avctx->priv_data;
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    s->avctx = avctx;
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    s->width = avctx->width;
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    s->height = avctx->height;
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    s->last_frame    = &s->frames[0];
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    s->current_frame = &s->frames[1];
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    avctx->pix_fmt = PIX_FMT_YUV444P;
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    return 0;
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}
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static int roq_decode_frame(AVCodecContext *avctx,
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                            void *data, int *data_size,
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                            AVPacket *avpkt)
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{
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    const uint8_t *buf = avpkt->data;
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    int buf_size = avpkt->size;
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    RoqContext *s = avctx->priv_data;
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    int copy= !s->current_frame->data[0];
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    if (avctx->reget_buffer(avctx, s->current_frame)) {
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        av_log(avctx, AV_LOG_ERROR, "  RoQ: get_buffer() failed\n");
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        return -1;
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    }
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    if(copy)
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        av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
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                        avctx->pix_fmt, avctx->width, avctx->height);
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    s->buf = buf;
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    s->size = buf_size;
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    roqvideo_decode_frame(s);
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    *data_size = sizeof(AVFrame);
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    *(AVFrame*)data = *s->current_frame;
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    /* shuffle frames */
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    FFSWAP(AVFrame *, s->current_frame, s->last_frame);
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    return buf_size;
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}
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static av_cold int roq_decode_end(AVCodecContext *avctx)
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{
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    RoqContext *s = avctx->priv_data;
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    /* release the last frame */
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    if (s->last_frame->data[0])
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        avctx->release_buffer(avctx, s->last_frame);
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    if (s->current_frame->data[0])
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        avctx->release_buffer(avctx, s->current_frame);
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    return 0;
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}
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AVCodec ff_roq_decoder = {
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    "roqvideo",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_ROQ,
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    sizeof(RoqContext),
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    roq_decode_init,
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    NULL,
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    roq_decode_end,
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    roq_decode_frame,
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    CODEC_CAP_DR1,
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    .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),
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};