From 7be166e4ea8690efe70adc159d2964b88b5f64cd Mon Sep 17 00:00:00 2001 From: Fabrice Bellard Date: Fri, 4 Oct 2002 07:49:00 +0000 Subject: [PATCH] simplified parsing - added MMX idct support Originally committed as revision 1000 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/dv.c | 187 +++++++++++++++++++++++++++++++------------------------- 1 file changed, 105 insertions(+), 82 deletions(-) diff --git a/libavcodec/dv.c b/libavcodec/dv.c index 0077474..3ab693c 100644 --- a/libavcodec/dv.c +++ b/libavcodec/dv.c @@ -36,8 +36,9 @@ typedef struct DVVideoDecodeContext { int linesize[3]; DCTELEM block[5*6][64] __align8; UINT8 dv_zigzag[2][64]; + UINT8 idct_permutation[64]; /* XXX: move it to static storage ? */ - UINT8 dv_shift[2][2][22][64]; + UINT8 dv_shift[2][22][64]; void (*idct_put[2])(UINT8 *dest, int line_size, DCTELEM *block); } DVVideoDecodeContext; @@ -49,24 +50,23 @@ static RL_VLC_ELEM *dv_rl_vlc[1]; static void dv_build_unquantize_tables(DVVideoDecodeContext *s) { - int i, e, q; + int i, q, j; /* NOTE: max left shift is 6 */ - for(e = 0; e < 2; e++) { - for(q = 0; q < 22; q++) { - /* 88 unquant */ - for(i = 1; i < 64; i++) { - /* 88 table */ - s->dv_shift[0][e][q][i] = - dv_quant_shifts[q][dv_88_areas[i]] + e + 1; - } - - /* 248 unquant */ - for(i = 1; i < 64; i++) { - /* 248 table */ - s->dv_shift[1][e][q][i] = - dv_quant_shifts[q][dv_248_areas[i]] + e + 1; - } + for(q = 0; q < 22; q++) { + /* 88 unquant */ + for(i = 1; i < 64; i++) { + /* 88 table */ + j = s->idct_permutation[i]; + s->dv_shift[0][q][j] = + dv_quant_shifts[q][dv_88_areas[i]] + 1; + } + + /* 248 unquant */ + for(i = 1; i < 64; i++) { + /* 248 table */ + s->dv_shift[1][q][i] = + dv_quant_shifts[q][dv_248_areas[i]] + 1; } } } @@ -74,6 +74,7 @@ static void dv_build_unquantize_tables(DVVideoDecodeContext *s) static int dvvideo_decode_init(AVCodecContext *avctx) { DVVideoDecodeContext *s = avctx->priv_data; + MpegEncContext s2; static int done; if (!done) { @@ -108,32 +109,46 @@ static int dvvideo_decode_init(AVCodecContext *avctx) dv_rl_vlc[0][i].run = run; } } + + /* ugly way to get the idct & scantable */ + /* XXX: fix it */ + memset(&s2, 0, sizeof(MpegEncContext)); + s2.flags = avctx->flags; + s2.avctx = avctx; +// s2->out_format = FMT_MJPEG; + s2.width = 8; + s2.height = 8; + if (MPV_common_init(&s2) < 0) + return -1; + + s->idct_put[0] = s2.idct_put; + memcpy(s->idct_permutation, s2.idct_permutation, 64); + memcpy(s->dv_zigzag[0], s2.intra_scantable.permutated, 64); + + /* XXX: use MMX also for idct248 */ + s->idct_put[1] = simple_idct248_put; + memcpy(s->dv_zigzag[1], dv_248_zigzag, 64); + + MPV_common_end(&s2); + /* XXX: do it only for constant case */ dv_build_unquantize_tables(s); - { - /* XXX: fix that : use mmx when possible */ - s->idct_put[0] = simple_idct_put; - s->idct_put[1] = simple_idct248_put; - memcpy(s->dv_zigzag[0], ff_zigzag_direct, 64); - memcpy(s->dv_zigzag[1], dv_248_zigzag, 64); - } return 0; } //#define VLC_DEBUG -typedef struct MBInfo { - const UINT8 *shift_table[6]; - const UINT8 *scan_table[6]; - UINT8 pos[6]; /* position in block */ - UINT8 eob_reached[6]; /* true if EOB has been reached */ - UINT8 dct_mode[6]; - UINT8 partial_bit_count[6]; - UINT16 partial_bit_buffer[6]; - UINT8 bit_buffer[80 + 4]; /* allow some slack */ - int bits_left; -} MBInfo; +typedef struct BlockInfo { + const UINT8 *shift_table; + const UINT8 *scan_table; + UINT8 pos; /* position in block */ + UINT8 eob_reached; /* true if EOB has been reached */ + UINT8 dct_mode; + UINT8 partial_bit_count; + UINT16 partial_bit_buffer; + int shift_offset; +} BlockInfo; /* block size in bits */ const static UINT16 block_sizes[6] = { @@ -146,23 +161,24 @@ const static UINT16 block_sizes[6] = { /* decode ac coefs */ static void dv_decode_ac(DVVideoDecodeContext *s, - MBInfo *mb, INT16 *block, int j, int last_index) + BlockInfo *mb, INT16 *block, int last_index) { int last_re_index; - const UINT8 *scan_table = mb->scan_table[j]; - const UINT8 *shift_table = mb->shift_table[j]; - int pos = mb->pos[j]; + int shift_offset = mb->shift_offset; + const UINT8 *scan_table = mb->scan_table; + const UINT8 *shift_table = mb->shift_table; + int pos = mb->pos; int level, pos1, sign, run; int partial_bit_count; OPEN_READER(re, &s->gb); #ifdef VLC_DEBUG - printf("start %d\n", j); + printf("start\n"); #endif /* if we must parse a partial vlc, we do it here */ - partial_bit_count = mb->partial_bit_count[j]; + partial_bit_count = mb->partial_bit_count; if (partial_bit_count > 0) { UINT8 buf[4]; UINT32 v; @@ -175,12 +191,12 @@ static void dv_decode_ac(DVVideoDecodeContext *s, #ifdef VLC_DEBUG printf("show=%04x\n", SHOW_UBITS(re, &s->gb, 16)); #endif - v = (mb->partial_bit_buffer[j] << l) | SHOW_UBITS(re, &s->gb, l); + v = (mb->partial_bit_buffer << l) | SHOW_UBITS(re, &s->gb, l); buf[0] = v >> 8; buf[1] = v; #ifdef VLC_DEBUG printf("v=%04x cnt=%d %04x\n", - v, partial_bit_count, (mb->partial_bit_buffer[j] << l)); + v, partial_bit_count, (mb->partial_bit_buffer << l)); #endif /* try to read the codeword */ init_get_bits(&gb1, buf, 4); @@ -204,9 +220,9 @@ static void dv_decode_ac(DVVideoDecodeContext *s, /* skip read bits */ last_re_index = 0; /* avoid warning */ re_index += l; - /* by redefinition, if we can read the vlc, all partial bits + /* by definition, if we can read the vlc, all partial bits will be read (otherwise we could have read the vlc before) */ - mb->partial_bit_count[j] = 0; + mb->partial_bit_count = 0; UPDATE_CACHE(re, &s->gb); goto handle_vlc; } @@ -230,11 +246,11 @@ static void dv_decode_ac(DVVideoDecodeContext *s, cannot_read: /* put position before read code */ re_index = last_re_index; - mb->eob_reached[j] = 0; + mb->eob_reached = 0; break; } /* EOB */ - mb->eob_reached[j] = 1; + mb->eob_reached = 1; break; } else if (level != 0) { if ((re_index + 1) > last_index) @@ -248,7 +264,7 @@ static void dv_decode_ac(DVVideoDecodeContext *s, goto read_error; } pos1 = scan_table[pos]; - level = level << shift_table[pos1]; + level = level << (shift_table[pos1] + shift_offset); block[pos1] = level; // printf("run=%d level=%d shift=%d\n", run, level, shift_table[pos1]); } else { @@ -264,13 +280,13 @@ static void dv_decode_ac(DVVideoDecodeContext *s, printf("error pos=%d\n", pos); #endif /* for errors, we consider the eob is reached */ - mb->eob_reached[j] = 1; + mb->eob_reached = 1; break; } } } CLOSE_READER(re, &s->gb); - mb->pos[j] = pos; + mb->pos = pos; } static inline void bit_copy(PutBitContext *pb, GetBitContext *gb, int bits_left) @@ -294,11 +310,13 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s, DCTELEM *block, *block1; int c_offset, bits_left; UINT8 *y_ptr; - MBInfo mb_data[5], *mb; + BlockInfo mb_data[5 * 6], *mb, *mb1; void (*idct_put)(UINT8 *dest, int line_size, DCTELEM *block); UINT8 *buf_ptr; PutBitContext pb, vs_pb; - UINT8 vs_bit_buffer[5 * 80 + 4]; + UINT8 mb_bit_buffer[80 + 4]; /* allow some slack */ + int mb_bit_count; + UINT8 vs_bit_buffer[5 * 80 + 4]; /* allow some slack */ int vs_bit_count; memset(s->block, 0, sizeof(s->block)); @@ -306,15 +324,16 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s, /* pass 1 : read DC and AC coefficients in blocks */ buf_ptr = buf_ptr1; block1 = &s->block[0][0]; - mb = mb_data; + mb1 = mb_data; init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80, NULL, NULL); vs_bit_count = 0; for(mb_index = 0; mb_index < 5; mb_index++) { /* skip header */ quant = buf_ptr[3] & 0x0f; buf_ptr += 4; - init_put_bits(&pb, mb->bit_buffer, 80, NULL, NULL); - mb->bits_left = 0; + init_put_bits(&pb, mb_bit_buffer, 80, NULL, NULL); + mb_bit_count = 0; + mb = mb1; block = block1; for(j = 0;j < 6; j++) { /* NOTE: size is not important here */ @@ -324,10 +343,11 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s, dc = get_bits(&s->gb, 9); dc = (dc << (32 - 9)) >> (32 - 9); dct_mode = get_bits1(&s->gb); - mb->dct_mode[j] = dct_mode; - mb->scan_table[j] = s->dv_zigzag[dct_mode]; + mb->dct_mode = dct_mode; + mb->scan_table = s->dv_zigzag[dct_mode]; class1 = get_bits(&s->gb, 2); - mb->shift_table[j] = s->dv_shift[dct_mode][class1 == 3] + mb->shift_offset = (class1 == 3); + mb->shift_table = s->dv_shift[dct_mode] [quant + dv_quant_offset[class1]]; dc = dc << 2; /* convert to unsigned because 128 is not added in the @@ -336,61 +356,64 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s, block[0] = dc; last_index = block_sizes[j]; buf_ptr += last_index >> 3; - mb->pos[j] = 0; - mb->partial_bit_count[j] = 0; + mb->pos = 0; + mb->partial_bit_count = 0; - dv_decode_ac(s, mb, block, j, last_index); + dv_decode_ac(s, mb, block, last_index); /* write the remaining bits in a new buffer only if the block is finished */ bits_left = last_index - s->gb.index; - if (mb->eob_reached[j]) { - mb->partial_bit_count[j] = 0; - mb->bits_left += bits_left; + if (mb->eob_reached) { + mb->partial_bit_count = 0; + mb_bit_count += bits_left; bit_copy(&pb, &s->gb, bits_left); } else { /* should be < 16 bits otherwise a codeword could have been parsed */ - mb->partial_bit_count[j] = bits_left; - mb->partial_bit_buffer[j] = get_bits(&s->gb, bits_left); + mb->partial_bit_count = bits_left; + mb->partial_bit_buffer = get_bits(&s->gb, bits_left); } block += 64; + mb++; } flush_put_bits(&pb); /* pass 2 : we can do it just after */ #ifdef VLC_DEBUG - printf("***pass 2 size=%d\n", mb->bits_left); + printf("***pass 2 size=%d\n", mb_bit_count); #endif block = block1; - init_get_bits(&s->gb, mb->bit_buffer, 80); + mb = mb1; + init_get_bits(&s->gb, mb_bit_buffer, 80); for(j = 0;j < 6; j++) { - if (!mb->eob_reached[j] && s->gb.index < mb->bits_left) { - dv_decode_ac(s, mb, block, j, mb->bits_left); + if (!mb->eob_reached && s->gb.index < mb_bit_count) { + dv_decode_ac(s, mb, block, mb_bit_count); /* if still not finished, no need to parse other blocks */ - if (!mb->eob_reached[j]) { + if (!mb->eob_reached) { /* we could not parse the current AC coefficient, so we add the remaining bytes */ - bits_left = mb->bits_left - s->gb.index; + bits_left = mb_bit_count - s->gb.index; if (bits_left > 0) { - mb->partial_bit_count[j] += bits_left; - mb->partial_bit_buffer[j] = - (mb->partial_bit_buffer[j] << bits_left) | + mb->partial_bit_count += bits_left; + mb->partial_bit_buffer = + (mb->partial_bit_buffer << bits_left) | get_bits(&s->gb, bits_left); } goto next_mb; } } block += 64; + mb++; } /* all blocks are finished, so the extra bytes can be used at the video segment level */ - bits_left = mb->bits_left - s->gb.index; + bits_left = mb_bit_count - s->gb.index; vs_bit_count += bits_left; bit_copy(&vs_pb, &s->gb, bits_left); next_mb: - mb++; + mb1 += 6; block1 += 6 * 64; } @@ -405,15 +428,15 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s, init_get_bits(&s->gb, vs_bit_buffer, 5 * 80); for(mb_index = 0; mb_index < 5; mb_index++) { for(j = 0;j < 6; j++) { - if (!mb->eob_reached[j]) { + if (!mb->eob_reached) { #ifdef VLC_DEBUG printf("start %d:%d\n", mb_index, j); #endif - dv_decode_ac(s, mb, block, j, vs_bit_count); + dv_decode_ac(s, mb, block, vs_bit_count); } block += 64; + mb++; } - mb++; } /* compute idct and place blocks */ @@ -429,7 +452,7 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s, else c_offset = ((mb_y >> 1) * s->linesize[1] * 8) + ((mb_x >> 1) * 8); for(j = 0;j < 6; j++) { - idct_put = s->idct_put[mb->dct_mode[j]]; + idct_put = s->idct_put[mb->dct_mode]; if (j < 4) { if (s->sampling_411) { idct_put(y_ptr + (j * 8), s->linesize[0], block); @@ -443,8 +466,8 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s, s->linesize[6 - j], block); } block += 64; + mb++; } - mb++; } } -- 2.7.4