Split RoQ decoder to accommodate future encoder patch

patch by Vitor vitor1001 gmail moc
original thread: [FFmpeg-devel] [PATCH] RoQ video encoder, take 2
date: 05/27/2007 12:21 PM

Originally committed as revision 9149 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 2 insertions, 242 deletions

diff --git a/libavcodec/roqvideo.c b/libavcodec/roqvideo.c
index 25c62874ea..5725757834 100644
--- a/libavcodec/roqvideo.c
+++ b/libavcodec/roqvideo.c
@@ -21,65 +21,15 @@
 
 /**
  * @file roqvideo.c
- * Id RoQ Video Decoder by Dr. Tim Ferguson
- * For more information about the Id RoQ format, visit:
- *   http://www.csse.monash.edu.au/~timf/
+ * Id RoQ Video common functions based on work by Dr. Tim Ferguson
  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
 #include "avcodec.h"
-#include "bytestream.h"
-#include "dsputil.h"
-
-typedef struct {
-  unsigned char y[4];
-  unsigned char u, v;
-} roq_cell;
-
-typedef struct {
-  int idx[4];
-} roq_qcell;
+#include "roqvideo.h"
 
 #define avg2(a,b) av_clip_uint8(((int)(a)+(int)(b)+1)>>1)
 #define avg4(a,b,c,d) av_clip_uint8(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)
 
-typedef struct RoqContext {
-
-    AVCodecContext *avctx;
-    DSPContext dsp;
-    AVFrame frames[2];
-    AVFrame *last_frame;
-    AVFrame *current_frame;
-    int first_frame;
-    int y_stride;
-    int c_stride;
-
-    roq_cell cells[256];
-    roq_qcell qcells[256];
-
-    unsigned char *buf;
-    int size;
-
-} RoqContext;
-
-#define RoQ_INFO              0x1001
-#define RoQ_QUAD_CODEBOOK     0x1002
-#define RoQ_QUAD_VQ           0x1011
-#define RoQ_SOUND_MONO        0x1020
-#define RoQ_SOUND_STEREO      0x1021
-
-#define RoQ_ID_MOT              0x00
-#define RoQ_ID_FCC              0x01
-#define RoQ_ID_SLD              0x02
-#define RoQ_ID_CCC              0x03
-
-#define get_byte(in_buffer) *(in_buffer++)
-
-
 void ff_apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
 {
     unsigned char *yptr;
@@ -277,193 +227,3 @@ void ff_apply_motion_8x8(RoqContext *ri, int x, int y,
         pb = ri->last_frame->data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
     }
 }
-
-static void roqvideo_decode_frame(RoqContext *ri)
-{
-    unsigned int chunk_id = 0, chunk_arg = 0;
-    unsigned long chunk_size = 0;
-    int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
-    int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
-    int frame_stats[2][4] = {{0},{0}};
-    roq_qcell *qcell;
-    unsigned char *buf = ri->buf;
-    unsigned char *buf_end = ri->buf + ri->size;
-
-    while (buf < buf_end) {
-        chunk_id = bytestream_get_le16(&buf);
-        chunk_size = bytestream_get_le32(&buf);
-        chunk_arg = bytestream_get_le16(&buf);
-
-        if(chunk_id == RoQ_QUAD_VQ)
-            break;
-        if(chunk_id == RoQ_QUAD_CODEBOOK) {
-            if((nv1 = chunk_arg >> 8) == 0)
-                nv1 = 256;
-            if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
-                nv2 = 256;
-            for(i = 0; i < nv1; i++) {
-                ri->cells[i].y[0] = get_byte(buf);
-                ri->cells[i].y[1] = get_byte(buf);
-                ri->cells[i].y[2] = get_byte(buf);
-                ri->cells[i].y[3] = get_byte(buf);
-                ri->cells[i].u = get_byte(buf);
-                ri->cells[i].v = get_byte(buf);
-            }
-            for(i = 0; i < nv2; i++)
-                for(j = 0; j < 4; j++)
-                    ri->qcells[i].idx[j] = get_byte(buf);
-        }
-    }
-
-    bpos = xpos = ypos = 0;
-    while(bpos < chunk_size) {
-        for (yp = ypos; yp < ypos + 16; yp += 8)
-            for (xp = xpos; xp < xpos + 16; xp += 8) {
-                if (vqflg_pos < 0) {
-                    vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
-                    vqflg_pos = 7;
-                }
-                vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
-                frame_stats[0][vqid]++;
-                vqflg_pos--;
-
-                switch(vqid) {
-                case RoQ_ID_MOT:
-                    ff_apply_motion_8x8(ri, xp, yp, 0, 0);
-                    break;
-                case RoQ_ID_FCC:
-                    mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
-                    my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
-                    ff_apply_motion_8x8(ri, xp, yp, mx, my);
-                    break;
-                case RoQ_ID_SLD:
-                    qcell = ri->qcells + buf[bpos++];
-                    ff_apply_vector_4x4(ri, xp, yp, ri->cells + qcell->idx[0]);
-                    ff_apply_vector_4x4(ri, xp+4, yp, ri->cells + qcell->idx[1]);
-                    ff_apply_vector_4x4(ri, xp, yp+4, ri->cells + qcell->idx[2]);
-                    ff_apply_vector_4x4(ri, xp+4, yp+4, ri->cells + qcell->idx[3]);
-                    break;
-                case RoQ_ID_CCC:
-                    for (k = 0; k < 4; k++) {
-                        x = xp; y = yp;
-                        if(k & 0x01) x += 4;
-                        if(k & 0x02) y += 4;
-
-                        if (vqflg_pos < 0) {
-                            vqflg = buf[bpos++];
-                            vqflg |= (buf[bpos++] << 8);
-                            vqflg_pos = 7;
-                        }
-                        vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
-                        frame_stats[1][vqid]++;
-                        vqflg_pos--;
-                        switch(vqid) {
-                        case RoQ_ID_MOT:
-                            ff_apply_motion_4x4(ri, x, y, 0, 0);
-                            break;
-                        case RoQ_ID_FCC:
-                            mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
-                            my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
-                            ff_apply_motion_4x4(ri, x, y, mx, my);
-                            break;
-                        case RoQ_ID_SLD:
-                            qcell = ri->qcells + buf[bpos++];
-                            ff_apply_vector_2x2(ri, x, y, ri->cells + qcell->idx[0]);
-                            ff_apply_vector_2x2(ri, x+2, y, ri->cells + qcell->idx[1]);
-                            ff_apply_vector_2x2(ri, x, y+2, ri->cells + qcell->idx[2]);
-                            ff_apply_vector_2x2(ri, x+2, y+2, ri->cells + qcell->idx[3]);
-                            break;
-                        case RoQ_ID_CCC:
-                            ff_apply_vector_2x2(ri, x, y, ri->cells + buf[bpos]);
-                            ff_apply_vector_2x2(ri, x+2, y, ri->cells + buf[bpos+1]);
-                            ff_apply_vector_2x2(ri, x, y+2, ri->cells + buf[bpos+2]);
-                            ff_apply_vector_2x2(ri, x+2, y+2, ri->cells + buf[bpos+3]);
-                            bpos += 4;
-                            break;
-                        }
-                    }
-                    break;
-                default:
-                    av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
-            }
-        }
-
-        xpos += 16;
-        if (xpos >= ri->avctx->width) {
-            xpos -= ri->avctx->width;
-            ypos += 16;
-        }
-        if(ypos >= ri->avctx->height)
-            break;
-    }
-}
-
-
-static int roq_decode_init(AVCodecContext *avctx)
-{
-    RoqContext *s = avctx->priv_data;
-
-    s->avctx = avctx;
-    s->first_frame = 1;
-    s->last_frame    = &s->frames[0];
-    s->current_frame = &s->frames[1];
-    avctx->pix_fmt = PIX_FMT_YUV420P;
-    dsputil_init(&s->dsp, avctx);
-
-    return 0;
-}
-
-static int roq_decode_frame(AVCodecContext *avctx,
-                            void *data, int *data_size,
-                            uint8_t *buf, int buf_size)
-{
-    RoqContext *s = avctx->priv_data;
-
-    if (avctx->get_buffer(avctx, s->current_frame)) {
-        av_log(avctx, AV_LOG_ERROR, "  RoQ: get_buffer() failed\n");
-        return -1;
-    }
-    s->y_stride = s->current_frame->linesize[0];
-    s->c_stride = s->current_frame->linesize[1];
-
-    s->buf = buf;
-    s->size = buf_size;
-    roqvideo_decode_frame(s);
-
-    /* release the last frame if it is allocated */
-    if (s->first_frame)
-        s->first_frame = 0;
-    else
-        avctx->release_buffer(avctx, s->last_frame);
-
-    *data_size = sizeof(AVFrame);
-    *(AVFrame*)data = *s->current_frame;
-
-    /* shuffle frames */
-    FFSWAP(AVFrame *, s->current_frame, s->last_frame);
-
-    return buf_size;
-}
-
-static int roq_decode_end(AVCodecContext *avctx)
-{
-    RoqContext *s = avctx->priv_data;
-
-    /* release the last frame */
-    if (s->last_frame->data[0])
-        avctx->release_buffer(avctx, s->last_frame);
-
-    return 0;
-}
-
-AVCodec roq_decoder = {
-    "roqvideo",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_ROQ,
-    sizeof(RoqContext),
-    roq_decode_init,
-    NULL,
-    roq_decode_end,
-    roq_decode_frame,
-    CODEC_CAP_DR1,
-};