diff options
author | David Conrad <lessen42@gmail.com> | 2010-03-04 02:27:43 +0300 |
---|---|---|
committer | David Conrad <lessen42@gmail.com> | 2010-03-04 02:27:43 +0300 |
commit | c72625f29902bfd7f01184c3eb1c29c94ec2a648 (patch) | |
tree | 5b37448d3683813aa90e8d3a6e8a318dd6816fd2 /libavcodec/vp3.c | |
parent | 7a095ea6fbf0bd26b02a783a0b2f2afd46f58578 (diff) |
Delay translating DCT tokens into coefficients until immediately before IDCT
This is generally around 12% faster than the prior method of creating a
linked list for each block as tokens are read, but can be anywhere from
8% to 28% faster depending on file and CPU.
Originally committed as revision 22190 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/vp3.c')
-rw-r--r-- | libavcodec/vp3.c | 355 |
1 files changed, 177 insertions, 178 deletions
diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c index 46633a6821..e2ee24a54d 100644 --- a/libavcodec/vp3.c +++ b/libavcodec/vp3.c @@ -44,15 +44,9 @@ static av_cold int vp3_decode_end(AVCodecContext *avctx); -typedef struct Coeff { - struct Coeff *next; - DCTELEM coeff; - uint8_t index; -} Coeff; - //FIXME split things out into their own arrays typedef struct Vp3Fragment { - Coeff *next_coeff; + int16_t dc; uint8_t coding_method; int8_t motion_x; int8_t motion_y; @@ -168,9 +162,6 @@ typedef struct Vp3DecodeContext { int fragment_height; Vp3Fragment *all_fragments; - uint8_t *coeff_counts; - Coeff *coeffs; - Coeff *next_coeff; int fragment_start[3]; int data_offset[3]; @@ -184,18 +175,38 @@ typedef struct Vp3DecodeContext { uint8_t qr_size [2][3][64]; uint16_t qr_base[2][3][64]; + /** + * This is a list of all tokens in bitstream order. Reordering takes place + * by pulling from each level during IDCT. As a consequence, IDCT must be + * in Hilbert order, making the minimum slice height 64 for 4:2:0 and 32 + * otherwise. The 32 different tokens with up to 12 bits of extradata are + * collapsed into 3 types, packed as follows: + * (from the low to high bits) + * + * 2 bits: type (0,1,2) + * 0: EOB run, 14 bits for run length (12 needed) + * 1: zero run, 7 bits for run length + * 7 bits for the next coefficient (3 needed) + * 2: coefficient, 14 bits (11 needed) + * + * Coefficients are signed, so are packed in the highest bits for automatic + * sign extension. + */ + int16_t *dct_tokens[3][64]; + int16_t *dct_tokens_base; +#define TOKEN_EOB(eob_run) ((eob_run) << 2) +#define TOKEN_ZERO_RUN(coeff, zero_run) (((coeff) << 9) + ((zero_run) << 2) + 1) +#define TOKEN_COEFF(coeff) (((coeff) << 2) + 2) + + /** + * number of blocks that contain DCT coefficients at the given level or higher + */ + int num_coded_frags[3][64]; + int total_num_coded_frags; + /* this is a list of indexes into the all_fragments array indicating * which of the fragments are coded */ - int *coded_fragment_list; - int coded_fragment_list_index; - - /* track which fragments have already been decoded; called 'fast' - * because this data structure avoids having to iterate through every - * fragment in coded_fragment_list; once a fragment has been fully - * decoded, it is removed from this list */ - int *fast_fragment_list; - int fragment_list_y_head; - int fragment_list_c_head; + int *coded_fragment_list[3]; VLC dc_vlc[16]; VLC ac_vlc_1[16]; @@ -222,11 +233,6 @@ typedef struct Vp3DecodeContext { * is coded. */ unsigned char *macroblock_coding; - int first_coded_y_fragment; - int first_coded_c_fragment; - int last_coded_y_fragment; - int last_coded_c_fragment; - uint8_t edge_emu_buffer[9*2048]; //FIXME dynamic alloc int8_t qscale_table[2048]; //FIXME dynamic alloc (width+15)/16 @@ -366,16 +372,11 @@ static void init_frame(Vp3DecodeContext *s, GetBitContext *gb) int i; /* zero out all of the fragment information */ - s->coded_fragment_list_index = 0; for (i = 0; i < s->fragment_count; i++) { - s->coeff_counts[i] = 0; s->all_fragments[i].motion_x = 127; s->all_fragments[i].motion_y = 127; - s->all_fragments[i].next_coeff= NULL; + s->all_fragments[i].dc = 0; s->all_fragments[i].qpi = 0; - s->coeffs[i].index= - s->coeffs[i].coeff=0; - s->coeffs[i].next= NULL; } } @@ -459,7 +460,6 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) int current_superblock = 0; int current_run = 0; int num_partial_superblocks = 0; - int first_c_fragment_seen; int i, j; int current_fragment; @@ -543,16 +543,13 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) /* figure out which fragments are coded; iterate through each * superblock (all planes) */ - s->coded_fragment_list_index = 0; - s->next_coeff= s->coeffs + s->fragment_count; - s->first_coded_y_fragment = s->first_coded_c_fragment = 0; - s->last_coded_y_fragment = s->last_coded_c_fragment = -1; - first_c_fragment_seen = 0; + s->total_num_coded_frags = 0; memset(s->macroblock_coding, MODE_COPY, s->macroblock_count); for (plane = 0; plane < 3; plane++) { int sb_start = (int[]){ 0, s->u_superblock_start, s->v_superblock_start }[plane]; int sb_end = sb_start + (plane ? s->c_superblock_count : s->y_superblock_count); + int num_coded_frags = 0; for (i = sb_start; i < sb_end; i++) { @@ -586,15 +583,8 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) * the next phase */ s->all_fragments[current_fragment].coding_method = MODE_INTER_NO_MV; - s->all_fragments[current_fragment].next_coeff= s->coeffs + current_fragment; - s->coded_fragment_list[s->coded_fragment_list_index] = + s->coded_fragment_list[plane][num_coded_frags++] = current_fragment; - if (plane && !first_c_fragment_seen) { - s->first_coded_c_fragment = s->coded_fragment_list_index; - s->last_coded_y_fragment = s->first_coded_c_fragment - 1; - first_c_fragment_seen = 1; - } - s->coded_fragment_list_index++; } else { /* not coded; copy this fragment from the prior frame */ s->all_fragments[current_fragment].coding_method = @@ -603,34 +593,12 @@ static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb) } } } + s->total_num_coded_frags += num_coded_frags; + for (i = 0; i < 64; i++) + s->num_coded_frags[plane][i] = num_coded_frags; + if (plane < 2) + s->coded_fragment_list[plane+1] = s->coded_fragment_list[plane] + num_coded_frags; } - - if (!first_c_fragment_seen) - /* only Y fragments coded in this frame */ - s->last_coded_y_fragment = s->coded_fragment_list_index - 1; - else - /* end the list of coded C fragments */ - s->last_coded_c_fragment = s->coded_fragment_list_index - 1; - - for (i = 0; i < s->fragment_count - 1; i++) { - s->fast_fragment_list[i] = i + 1; - } - s->fast_fragment_list[s->fragment_count - 1] = -1; - - if (s->last_coded_y_fragment == -1) - s->fragment_list_y_head = -1; - else { - s->fragment_list_y_head = s->first_coded_y_fragment; - s->fast_fragment_list[s->last_coded_y_fragment] = -1; - } - - if (s->last_coded_c_fragment == -1) - s->fragment_list_c_head = -1; - else { - s->fragment_list_c_head = s->first_coded_c_fragment; - s->fast_fragment_list[s->last_coded_c_fragment] = -1; - } - return 0; } @@ -887,7 +855,7 @@ static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb) static int unpack_block_qpis(Vp3DecodeContext *s, GetBitContext *gb) { int qpi, i, j, bit, run_length, blocks_decoded, num_blocks_at_qpi; - int num_blocks = s->coded_fragment_list_index; + int num_blocks = s->total_num_coded_frags; for (qpi = 0; qpi < s->nqps-1 && num_blocks > 0; qpi++) { i = blocks_decoded = num_blocks_at_qpi = 0; @@ -904,11 +872,11 @@ static int unpack_block_qpis(Vp3DecodeContext *s, GetBitContext *gb) num_blocks_at_qpi += run_length; for (j = 0; j < run_length; i++) { - if (i >= s->coded_fragment_list_index) + if (i >= s->total_num_coded_frags) return -1; - if (s->all_fragments[s->coded_fragment_list[i]].qpi == qpi) { - s->all_fragments[s->coded_fragment_list[i]].qpi += bit; + if (s->all_fragments[s->coded_fragment_list[0][i]].qpi == qpi) { + s->all_fragments[s->coded_fragment_list[0][i]].qpi += bit; j++; } } @@ -939,49 +907,40 @@ static int unpack_block_qpis(Vp3DecodeContext *s, GetBitContext *gb) */ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb, VLC *table, int coeff_index, - int y_plane, + int plane, int eob_run) { - int i; + int i, j = 0; int token; int zero_run = 0; DCTELEM coeff = 0; - Vp3Fragment *fragment; int bits_to_get; - int next_fragment; - int previous_fragment; - int fragment_num; - int *list_head; + int blocks_ended; + int coeff_i = 0; + int num_coeffs = s->num_coded_frags[plane][coeff_index]; + int16_t *dct_tokens = s->dct_tokens[plane][coeff_index]; /* local references to structure members to avoid repeated deferences */ - uint8_t *perm= s->scantable.permutated; - int *coded_fragment_list = s->coded_fragment_list; + int *coded_fragment_list = s->coded_fragment_list[plane]; Vp3Fragment *all_fragments = s->all_fragments; - uint8_t *coeff_counts = s->coeff_counts; VLC_TYPE (*vlc_table)[2] = table->table; - int *fast_fragment_list = s->fast_fragment_list; - if (y_plane) { - next_fragment = s->fragment_list_y_head; - list_head = &s->fragment_list_y_head; + if (num_coeffs < 0) + av_log(s->avctx, AV_LOG_ERROR, "Invalid number of coefficents at level %d\n", coeff_index); + + if (eob_run > num_coeffs) { + coeff_i = blocks_ended = num_coeffs; + eob_run -= num_coeffs; } else { - next_fragment = s->fragment_list_c_head; - list_head = &s->fragment_list_c_head; + coeff_i = blocks_ended = eob_run; + eob_run = 0; } - i = next_fragment; - previous_fragment = -1; /* this indicates that the previous fragment is actually the list head */ - while (i != -1) { - fragment_num = coded_fragment_list[i]; + // insert fake EOB token to cover the split between planes or zzi + if (blocks_ended) + dct_tokens[j++] = blocks_ended << 2; - if (coeff_counts[fragment_num] > coeff_index) { - previous_fragment = i; - i = fast_fragment_list[i]; - continue; - } - fragment = &all_fragments[fragment_num]; - - if (!eob_run) { + while (coeff_i < num_coeffs) { /* decode a VLC into a token */ token = get_vlc2(gb, vlc_table, 5, 3); /* use the token to get a zero run, a coefficient, and an eob run */ @@ -989,7 +948,20 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb, eob_run = eob_run_base[token]; if (eob_run_get_bits[token]) eob_run += get_bits(gb, eob_run_get_bits[token]); - coeff = zero_run = 0; + + // record only the number of blocks ended in this plane, + // any spill will be recorded in the next plane. + if (eob_run > num_coeffs - coeff_i) { + dct_tokens[j++] = TOKEN_EOB(num_coeffs - coeff_i); + blocks_ended += num_coeffs - coeff_i; + eob_run -= num_coeffs - coeff_i; + coeff_i = num_coeffs; + } else { + dct_tokens[j++] = TOKEN_EOB(eob_run); + blocks_ended += eob_run; + coeff_i += eob_run; + eob_run = 0; + } } else { bits_to_get = coeff_get_bits[token]; if (bits_to_get) @@ -999,34 +971,49 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb, zero_run = zero_run_base[token]; if (zero_run_get_bits[token]) zero_run += get_bits(gb, zero_run_get_bits[token]); - } - } - if (!eob_run) { - coeff_counts[fragment_num] += zero_run; - if (coeff_counts[fragment_num] < 64){ - fragment->next_coeff->coeff= coeff; - fragment->next_coeff->index= perm[coeff_counts[fragment_num]++]; //FIXME perm here already? - fragment->next_coeff->next= s->next_coeff; - s->next_coeff->next=NULL; - fragment->next_coeff= s->next_coeff++; - } - /* previous fragment is now this fragment */ - previous_fragment = i; - } else { - coeff_counts[fragment_num] |= 128; - eob_run--; - /* remove this fragment from the list */ - if (previous_fragment != -1) - fast_fragment_list[previous_fragment] = fast_fragment_list[i]; - else - *list_head = fast_fragment_list[i]; - /* previous fragment remains unchanged */ - } + if (zero_run) { + dct_tokens[j++] = TOKEN_ZERO_RUN(coeff, zero_run); + } else { + // Save DC into the fragment structure. DC prediction is + // done in raster order, so the actual DC can't be in with + // other tokens. We still need the token in dct_tokens[] + // however, or else the structure collapses on itself. + if (!coeff_index) + all_fragments[coded_fragment_list[coeff_i]].dc = coeff; + + dct_tokens[j++] = TOKEN_COEFF(coeff); + } + + if (coeff_index + zero_run > 64) { + av_log(s->avctx, AV_LOG_ERROR, "Invalid zero run of %d with" + " %d coeffs left\n", zero_run, 64-coeff_index); + zero_run = 64 - coeff_index; + } - i = fast_fragment_list[i]; + // zero runs code multiple coefficients, + // so don't try to decode coeffs for those higher levels + for (i = coeff_index+1; i <= coeff_index+zero_run; i++) + s->num_coded_frags[plane][i]--; + coeff_i++; + } } + if (blocks_ended > s->num_coded_frags[plane][coeff_index]) + av_log(s->avctx, AV_LOG_ERROR, "More blocks ended than coded!\n"); + + // decrement the number of blocks that have higher coeffecients for each + // EOB run at this level + if (blocks_ended) + for (i = coeff_index+1; i < 64; i++) + s->num_coded_frags[plane][i] -= blocks_ended; + + // setup the next buffer + if (plane < 2) + s->dct_tokens[plane+1][coeff_index] = dct_tokens + j; + else if (coeff_index < 63) + s->dct_tokens[0][coeff_index+1] = dct_tokens + j; + return eob_run; } @@ -1049,20 +1036,24 @@ static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb) VLC *y_tables[64]; VLC *c_tables[64]; + s->dct_tokens[0][0] = s->dct_tokens_base; + /* fetch the DC table indexes */ dc_y_table = get_bits(gb, 4); dc_c_table = get_bits(gb, 4); /* unpack the Y plane DC coefficients */ residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_y_table], 0, - 1, residual_eob_run); + 0, residual_eob_run); /* reverse prediction of the Y-plane DC coefficients */ reverse_dc_prediction(s, 0, s->fragment_width, s->fragment_height); /* unpack the C plane DC coefficients */ residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0, - 0, residual_eob_run); + 1, residual_eob_run); + residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0, + 2, residual_eob_run); /* reverse prediction of the C-plane DC coefficients */ if (!(s->avctx->flags & CODEC_FLAG_GRAY)) @@ -1097,13 +1088,13 @@ static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb) /* decode all AC coefficents */ for (i = 1; i <= 63; i++) { - if (s->fragment_list_y_head != -1) residual_eob_run = unpack_vlcs(s, gb, y_tables[i], i, - 1, residual_eob_run); + 0, residual_eob_run); - if (s->fragment_list_c_head != -1) residual_eob_run = unpack_vlcs(s, gb, c_tables[i], i, - 0, residual_eob_run); + 1, residual_eob_run); + residual_eob_run = unpack_vlcs(s, gb, c_tables[i], i, + 2, residual_eob_run); } return 0; @@ -1116,7 +1107,7 @@ static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb) */ #define COMPATIBLE_FRAME(x) \ (compatible_frame[s->all_fragments[x].coding_method] == current_frame_type) -#define DC_COEFF(u) (s->coeffs[u].index ? 0 : s->coeffs[u].coeff) //FIXME do somethin to simplify this +#define DC_COEFF(u) s->all_fragments[u].dc static void reverse_dc_prediction(Vp3DecodeContext *s, int first_fragment, @@ -1260,21 +1251,9 @@ static void reverse_dc_prediction(Vp3DecodeContext *s, } /* at long last, apply the predictor */ - if(s->coeffs[i].index){ - *s->next_coeff= s->coeffs[i]; - s->coeffs[i].index=0; - s->coeffs[i].coeff=0; - s->coeffs[i].next= s->next_coeff++; - } - s->coeffs[i].coeff += predicted_dc; + DC_COEFF(i) += predicted_dc; /* save the DC */ last_dc[current_frame_type] = DC_COEFF(i); - if(DC_COEFF(i) && !(s->coeff_counts[i]&127)){ - s->coeff_counts[i]= 129; -// s->all_fragments[i].next_coeff= s->next_coeff; - s->coeffs[i].next= s->next_coeff; - (s->next_coeff++)->next=NULL; - } } } } @@ -1344,6 +1323,47 @@ static void apply_loop_filter(Vp3DecodeContext *s, int plane, int ystart, int ye } /** + * Pulls DCT tokens from the 64 levels to decode and dequant the coefficients + * for the next block in coding order + */ +static inline int vp3_dequant(Vp3DecodeContext *s, Vp3Fragment *frag, + int plane, int inter, DCTELEM block[64]) +{ + int16_t *dequantizer = s->qmat[frag->qpi][inter][plane]; + uint8_t *perm = s->scantable.permutated; + int i = 0; + + do { + int token = *s->dct_tokens[plane][i]; + switch (token & 3) { + case 0: // EOB + if (--token < 4) // 0-3 are token types, so the EOB run must now be 0 + s->dct_tokens[plane][i]++; + else + *s->dct_tokens[plane][i] = token & ~3; + goto end; + case 1: // zero run + s->dct_tokens[plane][i]++; + i += (token >> 2) & 0x7f; + block[perm[i]] = (token >> 9) * dequantizer[perm[i]]; + i++; + break; + case 2: // coeff + block[perm[i]] = (token >> 2) * dequantizer[perm[i]]; + s->dct_tokens[plane][i++]++; + break; + default: + av_log(s->avctx, AV_LOG_ERROR, "internal: invalid token type\n"); + return i; + } + } while (i < 64); +end: + // the actual DC+prediction is in the fragment structure + block[0] = frag->dc * s->qmat[0][inter][plane][0]; + return i; +} + +/** * called when all pixels up to row y are complete */ static void vp3_draw_horiz_band(Vp3DecodeContext *s, int y) @@ -1381,7 +1401,6 @@ static void vp3_draw_horiz_band(Vp3DecodeContext *s, int y) static void render_slice(Vp3DecodeContext *s, int slice) { int x, y, i, j; - int16_t *dequantizer; LOCAL_ALIGNED_16(DCTELEM, block, [64]); int motion_x = 0xdeadbeef, motion_y = 0xdeadbeef; int motion_halfpel_index; @@ -1436,6 +1455,7 @@ static void render_slice(Vp3DecodeContext *s, int slice) /* transform if this block was coded */ if (s->all_fragments[i].coding_method != MODE_COPY) { + int intra = s->all_fragments[i].coding_method == MODE_INTRA; if ((s->all_fragments[i].coding_method == MODE_USING_GOLDEN) || (s->all_fragments[i].coding_method == MODE_GOLDEN_MV)) @@ -1499,27 +1519,10 @@ static void render_slice(Vp3DecodeContext *s, int slice) motion_source + stride + 1 + d, stride, 8); } - dequantizer = s->qmat[s->all_fragments[i].qpi][1][plane]; - }else{ - dequantizer = s->qmat[s->all_fragments[i].qpi][0][plane]; } - /* dequantize the DCT coefficients */ - if(s->avctx->idct_algo==FF_IDCT_VP3){ - Coeff *coeff= s->coeffs + i; s->dsp.clear_block(block); - while(coeff->next){ - block[coeff->index]= coeff->coeff * dequantizer[coeff->index]; - coeff= coeff->next; - } - }else{ - Coeff *coeff= s->coeffs + i; - s->dsp.clear_block(block); - while(coeff->next){ - block[coeff->index]= (coeff->coeff * dequantizer[coeff->index] + 2)>>2; - coeff= coeff->next; - } - } + vp3_dequant(s, s->all_fragments + i, plane, !intra, block); /* invert DCT and place (or add) in final output */ @@ -1624,12 +1627,10 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx) s->fragment_start[2] = s->fragment_width * s->fragment_height * 5 / 4; s->all_fragments = av_malloc(s->fragment_count * sizeof(Vp3Fragment)); - s->coeff_counts = av_malloc(s->fragment_count * sizeof(*s->coeff_counts)); - s->coeffs = av_malloc(s->fragment_count * sizeof(Coeff) * 65); - s->coded_fragment_list = av_malloc(s->fragment_count * sizeof(int)); - s->fast_fragment_list = av_malloc(s->fragment_count * sizeof(int)); - if (!s->superblock_coding || !s->all_fragments || !s->coeff_counts || - !s->coeffs || !s->coded_fragment_list || !s->fast_fragment_list) { + s->coded_fragment_list[0] = av_malloc(s->fragment_count * sizeof(int)); + s->dct_tokens_base = av_malloc(64*s->fragment_count * sizeof(*s->dct_tokens_base)); + if (!s->superblock_coding || !s->all_fragments || !s->dct_tokens_base || + !s->coded_fragment_list[0]) { vp3_decode_end(avctx); return -1; } @@ -1928,10 +1929,8 @@ static av_cold int vp3_decode_end(AVCodecContext *avctx) av_free(s->superblock_coding); av_free(s->all_fragments); - av_free(s->coeff_counts); - av_free(s->coeffs); - av_free(s->coded_fragment_list); - av_free(s->fast_fragment_list); + av_free(s->coded_fragment_list[0]); + av_free(s->dct_tokens_base); av_free(s->superblock_fragments); av_free(s->macroblock_coding); |