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https://github.com/FFmpeg/FFmpeg.git
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attempt to implement xiphs useless and stupid quantization matrix mess
Originally committed as revision 5775 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
187c9be7a6
commit
ae1dd8e125
205
libavcodec/vp3.c
205
libavcodec/vp3.c
@ -262,9 +262,10 @@ typedef struct Vp3DecodeContext {
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/* tables */
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uint16_t coded_dc_scale_factor[64];
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uint32_t coded_ac_scale_factor[64];
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uint16_t coded_intra_y_dequant[64];
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uint16_t coded_intra_c_dequant[64];
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uint16_t coded_inter_dequant[64];
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uint8_t base_matrix[384][64];
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uint8_t qr_count[2][3];
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uint8_t qr_size [2][3][64];
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uint16_t qr_base[2][3][64];
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/* this is a list of indices into the all_fragments array indicating
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* which of the fragments are coded */
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@ -643,98 +644,38 @@ static void init_frame(Vp3DecodeContext *s, GetBitContext *gb)
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*/
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static void init_dequantizer(Vp3DecodeContext *s)
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{
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int ac_scale_factor = s->coded_ac_scale_factor[s->quality_index];
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int dc_scale_factor = s->coded_dc_scale_factor[s->quality_index];
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int i, j;
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int i, j, plane, inter, qri, bmi, bmj, qistart;
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debug_vp3(" vp3: initializing dequantization tables\n");
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/*
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* Scale dequantizers:
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*
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* quantizer * sf
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* --------------
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* 100
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*
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* where sf = dc_scale_factor for DC quantizer
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* or ac_scale_factor for AC quantizer
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*
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* Then, saturate the result to a lower limit of MIN_DEQUANT_VAL.
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*/
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#define SCALER 4
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for(inter=0; inter<2; inter++){
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for(plane=0; plane<3; plane++){
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int sum=0;
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for(qri=0; qri<s->qr_count[inter][plane]; qri++){
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sum+= s->qr_size[inter][plane][qri];
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if(s->quality_index <= sum)
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break;
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}
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qistart= sum - s->qr_size[inter][plane][qri];
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bmi= s->qr_base[inter][plane][qri ];
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bmj= s->qr_base[inter][plane][qri+1];
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for(i=0; i<64; i++){
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int coeff= ( 2*(sum -s->quality_index)*s->base_matrix[bmi][i]
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- 2*(qistart-s->quality_index)*s->base_matrix[bmj][i]
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+ s->qr_size[inter][plane][qri])
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/ (2*s->qr_size[inter][plane][qri]);
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/* scale DC quantizers */
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s->qmat[0][0][0] = s->coded_intra_y_dequant[0] * dc_scale_factor / 100;
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if (s->qmat[0][0][0] < MIN_DEQUANT_VAL * 2)
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s->qmat[0][0][0] = MIN_DEQUANT_VAL * 2;
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s->qmat[0][0][0] *= SCALER;
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int qmin= 8<<(inter + !plane);
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int qscale= i ? ac_scale_factor : dc_scale_factor;
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s->qmat[0][1][0] = s->coded_intra_c_dequant[0] * dc_scale_factor / 100;
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if (s->qmat[0][1][0] < MIN_DEQUANT_VAL * 2)
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s->qmat[0][1][0] = MIN_DEQUANT_VAL * 2;
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s->qmat[0][1][0] *= SCALER;
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s->qmat[1][0][0] = s->coded_inter_dequant[0] * dc_scale_factor / 100;
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if (s->qmat[1][0][0] < MIN_DEQUANT_VAL * 4)
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s->qmat[1][0][0] = MIN_DEQUANT_VAL * 4;
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s->qmat[1][0][0] *= SCALER;
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/* scale AC quantizers, zigzag at the same time in preparation for
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* the dequantization phase */
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for (i = 1; i < 64; i++) {
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int k= s->scantable.scantable[i];
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j = s->scantable.permutated[i];
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s->qmat[0][0][j] = s->coded_intra_y_dequant[k] * ac_scale_factor / 100;
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if (s->qmat[0][0][j] < MIN_DEQUANT_VAL)
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s->qmat[0][0][j] = MIN_DEQUANT_VAL;
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s->qmat[0][0][j] *= SCALER;
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s->qmat[0][1][j] = s->coded_intra_c_dequant[k] * ac_scale_factor / 100;
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if (s->qmat[0][1][j] < MIN_DEQUANT_VAL)
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s->qmat[0][1][j] = MIN_DEQUANT_VAL;
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s->qmat[0][1][j] *= SCALER;
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s->qmat[1][0][j] = s->coded_inter_dequant[k] * ac_scale_factor / 100;
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if (s->qmat[1][0][j] < MIN_DEQUANT_VAL * 2)
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s->qmat[1][0][j] = MIN_DEQUANT_VAL * 2;
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s->qmat[1][0][j] *= SCALER;
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s->qmat[inter][plane][i]= clip((qscale * coeff)/100 * 4, qmin, 4096);
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}
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}
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}
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memcpy(s->qmat[0][2], s->qmat[0][1], sizeof(s->qmat[0][0]));
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memcpy(s->qmat[1][1], s->qmat[1][0], sizeof(s->qmat[0][0]));
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memcpy(s->qmat[1][2], s->qmat[1][0], sizeof(s->qmat[0][0]));
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memset(s->qscale_table, (FFMAX(s->qmat[0][0][1], s->qmat[0][1][1])+8)/16, 512); //FIXME finetune
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/* print debug information as requested */
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debug_dequantizers("intra Y dequantizers:\n");
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for (i = 0; i < 8; i++) {
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for (j = i * 8; j < i * 8 + 8; j++) {
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debug_dequantizers(" %4d,", s->qmat[0][0][j]);
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}
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debug_dequantizers("\n");
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}
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debug_dequantizers("\n");
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debug_dequantizers("intra C dequantizers:\n");
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for (i = 0; i < 8; i++) {
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for (j = i * 8; j < i * 8 + 8; j++) {
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debug_dequantizers(" %4d,", s->qmat[0][1][j]);
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}
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debug_dequantizers("\n");
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}
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debug_dequantizers("\n");
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debug_dequantizers("interframe dequantizers:\n");
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for (i = 0; i < 8; i++) {
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for (j = i * 8; j < i * 8 + 8; j++) {
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debug_dequantizers(" %4d,", s->qmat[1][0][j]);
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}
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debug_dequantizers("\n");
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}
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debug_dequantizers("\n");
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}
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/*
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@ -2201,7 +2142,7 @@ static void theora_calculate_pixel_addresses(Vp3DecodeContext *s)
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static int vp3_decode_init(AVCodecContext *avctx)
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{
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Vp3DecodeContext *s = avctx->priv_data;
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int i;
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int i, inter, plane;
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int c_width;
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int c_height;
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int y_superblock_count;
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@ -2284,14 +2225,23 @@ static int vp3_decode_init(AVCodecContext *avctx)
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for (i = 0; i < 64; i++)
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s->coded_ac_scale_factor[i] = vp31_ac_scale_factor[i];
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for (i = 0; i < 64; i++)
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s->coded_intra_y_dequant[i] = vp31_intra_y_dequant[i];
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s->base_matrix[0][i] = vp31_intra_y_dequant[i];
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for (i = 0; i < 64; i++)
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s->coded_intra_c_dequant[i] = vp31_intra_c_dequant[i];
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s->base_matrix[1][i] = vp31_intra_c_dequant[i];
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for (i = 0; i < 64; i++)
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s->coded_inter_dequant[i] = vp31_inter_dequant[i];
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s->base_matrix[2][i] = vp31_inter_dequant[i];
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for (i = 0; i < 64; i++)
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s->filter_limit_values[i] = vp31_filter_limit_values[i];
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for(inter=0; inter<2; inter++){
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for(plane=0; plane<3; plane++){
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s->qr_count[inter][plane]= 1;
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s->qr_size [inter][plane][0]= 63;
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s->qr_base [inter][plane][0]=
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s->qr_base [inter][plane][1]= 2*inter + (!!plane)*!inter;
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}
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}
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/* init VLC tables */
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for (i = 0; i < 16; i++) {
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@ -2714,7 +2664,7 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
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static int theora_decode_tables(AVCodecContext *avctx, GetBitContext *gb)
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{
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Vp3DecodeContext *s = avctx->priv_data;
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int i, n, matrices;
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int i, n, matrices, inter, plane;
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if (s->theora >= 0x030200) {
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n = get_bits(gb, 3);
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@ -2743,52 +2693,57 @@ static int theora_decode_tables(AVCodecContext *avctx, GetBitContext *gb)
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matrices = get_bits(gb, 9) + 1;
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else
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matrices = 3;
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if (matrices != 3) {
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av_log(avctx,AV_LOG_ERROR, "unsupported matrices: %d\n", matrices);
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// return -1;
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if(matrices > 384){
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av_log(avctx, AV_LOG_ERROR, "invalid number of base matrixes\n");
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return -1;
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}
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/* y coeffs */
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for (i = 0; i < 64; i++)
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s->coded_intra_y_dequant[i] = get_bits(gb, 8);
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/* uv coeffs */
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for (i = 0; i < 64; i++)
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s->coded_intra_c_dequant[i] = get_bits(gb, 8);
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/* inter coeffs */
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for (i = 0; i < 64; i++)
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s->coded_inter_dequant[i] = get_bits(gb, 8);
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/* skip unknown matrices */
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n = matrices - 3;
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while(n--)
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for(n=0; n<matrices; n++){
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for (i = 0; i < 64; i++)
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skip_bits(gb, 8);
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s->base_matrix[n][i]= get_bits(gb, 8);
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}
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for (i = 0; i <= 1; i++) {
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for (n = 0; n <= 2; n++) {
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int newqr;
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if (i > 0 || n > 0)
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for (inter = 0; inter <= 1; inter++) {
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for (plane = 0; plane <= 2; plane++) {
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int newqr= 1;
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if (inter || plane > 0)
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newqr = get_bits(gb, 1);
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else
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newqr = 1;
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if (!newqr) {
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if (i > 0)
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get_bits(gb, 1);
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//FIXME this is simply incomplete
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}
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else {
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int qi = 0;
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//FIXME this is simply incomplete
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skip_bits(gb, av_log2(matrices-1)+1);
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while (qi < 63) {
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qi += get_bits(gb, av_log2(63-qi)+1) + 1;
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skip_bits(gb, av_log2(matrices-1)+1);
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int qtj, plj;
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if(inter && get_bits(gb, 1)){
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qtj = 0;
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plj = plane;
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}else{
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qtj= (3*inter + plane - 1) / 3;
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plj= (plane + 2) % 3;
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}
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s->qr_count[inter][plane]= s->qr_count[qtj][plj];
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memcpy(s->qr_size[inter][plane], s->qr_size[qtj][plj], sizeof(s->qr_size[0][0]));
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memcpy(s->qr_base[inter][plane], s->qr_base[qtj][plj], sizeof(s->qr_base[0][0]));
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} else {
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int qri= 0;
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int qi = 0;
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for(;;){
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i= get_bits(gb, av_log2(matrices-1)+1);
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if(i>= matrices){
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av_log(avctx, AV_LOG_ERROR, "invalid base matrix index\n");
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return -1;
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}
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s->qr_base[inter][plane][qri]= i;
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if(qi >= 63)
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break;
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i = get_bits(gb, av_log2(63-qi)+1) + 1;
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s->qr_size[inter][plane][qri++]= i;
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qi += i;
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}
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if (qi > 63) {
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av_log(avctx, AV_LOG_ERROR, "invalid qi %d > 63\n", qi);
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return -1;
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}
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s->qr_count[inter][plane]= qri;
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}
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}
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}
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