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ljpegenc: split bgr encoding into a separate function

This commit is contained in:
Anton Khirnov 2013-12-02 23:56:51 +01:00
parent daffed3b17
commit fa4476815d
1 changed files with 58 additions and 45 deletions
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103
libavcodec/ljpegenc.c
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@ -57,6 +57,61 @@ typedef struct LJpegEncContext {
uint16_t (*scratch)[4];
} LJpegEncContext;
static int ljpeg_encode_bgr(AVCodecContext *avctx, PutBitContext *pb,
const AVFrame *frame)
{
LJpegEncContext *s = avctx->priv_data;
const int width = frame->width;
const int height = frame->height;
const int linesize = frame->linesize[0];
uint16_t (*buffer)[4] = s->scratch;
const int predictor = avctx->prediction_method+1;
int left[3], top[3], topleft[3];
int x, y, i;
for (i = 0; i < 3; i++)
buffer[0][i] = 1 << (9 - 1);
for (y = 0; y < height; y++) {
const int modified_predictor = y ? predictor : 1;
uint8_t *ptr = frame->data[0] + (linesize * y);
if (pb->buf_end - pb->buf - (put_bits_count(pb) >> 3) < width * 3 * 3) {
av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
return -1;
}
for (i = 0; i < 3; i++)
top[i]= left[i]= topleft[i]= buffer[0][i];
for (x = 0; x < width; x++) {
buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
for (i = 0; i < 3; i++) {
int pred, diff;
PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
topleft[i] = top[i];
top[i] = buffer[x+1][i];
left[i] = buffer[x][i];
diff = ((left[i] - pred + 0x100) & 0x1FF) - 0x100;
if (i == 0)
ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
else
ff_mjpeg_encode_dc(pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
}
}
}
return 0;
}
static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
@ -89,51 +144,9 @@ static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
header_bits = put_bits_count(&pb);
if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
int x, y, i;
const int linesize = pict->linesize[0];
uint16_t (*buffer)[4] = s->scratch;
int left[3], top[3], topleft[3];
for(i=0; i<3; i++){
buffer[0][i]= 1 << (9 - 1);
}
for(y = 0; y < height; y++) {
const int modified_predictor= y ? predictor : 1;
uint8_t *ptr = pict->data[0] + (linesize * y);
if(pb.buf_end - pb.buf - (put_bits_count(&pb) >> 3) < width * 3 * 3) {
av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
return -1;
}
for(i=0; i<3; i++){
top[i]= left[i]= topleft[i]= buffer[0][i];
}
for(x = 0; x < width; x++) {
buffer[x][1] = ptr[3 * x + 0] - ptr[3 * x + 1] + 0x100;
buffer[x][2] = ptr[3 * x + 2] - ptr[3 * x + 1] + 0x100;
buffer[x][0] = (ptr[3 * x + 0] + 2 * ptr[3 * x + 1] + ptr[3 * x + 2]) >> 2;
for(i=0;i<3;i++) {
int pred, diff;
PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
topleft[i]= top[i];
top[i]= buffer[x+1][i];
left[i]= buffer[x][i];
diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
if(i==0)
ff_mjpeg_encode_dc(&pb, diff, s->huff_size_dc_luminance, s->huff_code_dc_luminance); //FIXME ugly
else
ff_mjpeg_encode_dc(&pb, diff, s->huff_size_dc_chrominance, s->huff_code_dc_chrominance);
}
}
}
ret = ljpeg_encode_bgr(avctx, &pb, pict);
if (ret < 0)
return ret;
}else{
int mb_x, mb_y, i;