diff options
Diffstat (limited to 'libavcodec/mpegvideo.c')
| -rw-r--r-- | libavcodec/mpegvideo.c | 1281 |
1 files changed, 1281 insertions, 0 deletions
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c new file mode 100644 index 0000000000..467062ddf6 --- /dev/null +++ b/libavcodec/mpegvideo.c @@ -0,0 +1,1281 @@ +/* + * The simplest mpeg encoder (well, it was the simplest!) + * Copyright (c) 2000,2001 Gerard Lantau. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <stdlib.h> +#include <stdio.h> +#include <math.h> +#include <string.h> +#include "avcodec.h" +#include "dsputil.h" +#include "mpegvideo.h" + +#define EDGE_WIDTH 16 + +/* enable all paranoid tests for rounding, overflows, etc... */ +//#define PARANOID + +//#define DEBUG + +/* for jpeg fast DCT */ +#define CONST_BITS 14 + +static const unsigned short aanscales[64] = { + /* precomputed values scaled up by 14 bits */ + 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520, + 22725, 31521, 29692, 26722, 22725, 17855, 12299, 6270, + 21407, 29692, 27969, 25172, 21407, 16819, 11585, 5906, + 19266, 26722, 25172, 22654, 19266, 15137, 10426, 5315, + 16384, 22725, 21407, 19266, 16384, 12873, 8867, 4520, + 12873, 17855, 16819, 15137, 12873, 10114, 6967, 3552, + 8867, 12299, 11585, 10426, 8867, 6967, 4799, 2446, + 4520, 6270, 5906, 5315, 4520, 3552, 2446, 1247 +}; + +static UINT8 h263_chroma_roundtab[16] = { + 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, +}; + +static void encode_picture(MpegEncContext *s, int picture_number); +static void rate_control_init(MpegEncContext *s); +static int rate_estimate_qscale(MpegEncContext *s); + +/* default motion estimation */ +int motion_estimation_method = ME_LOG; + +/* XXX: should use variable shift ? */ +#define QMAT_SHIFT_MMX 19 +#define QMAT_SHIFT 25 + +static void convert_matrix(int *qmat, const UINT16 *quant_matrix, int qscale) +{ + int i; + + if (av_fdct == jpeg_fdct_ifast) { + for(i=0;i<64;i++) { + /* 16 <= qscale * quant_matrix[i] <= 7905 */ + /* 19952 <= aanscales[i] * qscale * quant_matrix[i] <= 249205026 */ + + qmat[i] = (int)((1ULL << (QMAT_SHIFT + 11)) / (aanscales[i] * qscale * quant_matrix[i])); + } + } else { + for(i=0;i<64;i++) { + /* We can safely suppose that 16 <= quant_matrix[i] <= 255 + So 16 <= qscale * quant_matrix[i] <= 7905 + so (1 << QMAT_SHIFT) / 16 >= qmat[i] >= (1 << QMAT_SHIFT) / 7905 + */ + qmat[i] = (1 << QMAT_SHIFT_MMX) / (qscale * quant_matrix[i]); + } + } +} + +/* init common structure for both encoder and decoder */ +int MPV_common_init(MpegEncContext *s) +{ + int c_size, i; + UINT8 *pict; + + s->mb_width = (s->width + 15) / 16; + s->mb_height = (s->height + 15) / 16; + s->linesize = s->mb_width * 16 + 2 * EDGE_WIDTH; + + for(i=0;i<3;i++) { + int w, h, shift, pict_start; + + w = s->linesize; + h = s->mb_height * 16 + 2 * EDGE_WIDTH; + shift = (i == 0) ? 0 : 1; + c_size = (w >> shift) * (h >> shift); + pict_start = (w >> shift) * (EDGE_WIDTH >> shift) + (EDGE_WIDTH >> shift); + + pict = av_mallocz(c_size); + if (pict == NULL) + goto fail; + s->last_picture_base[i] = pict; + s->last_picture[i] = pict + pict_start; + + pict = av_mallocz(c_size); + if (pict == NULL) + goto fail; + s->next_picture_base[i] = pict; + s->next_picture[i] = pict + pict_start; + + if (s->has_b_frames) { + pict = av_mallocz(c_size); + if (pict == NULL) + goto fail; + s->aux_picture_base[i] = pict; + s->aux_picture[i] = pict + pict_start; + } + } + + if (s->out_format == FMT_H263) { + int size; + /* MV prediction */ + size = (2 * s->mb_width + 2) * (2 * s->mb_height + 2); + s->motion_val = malloc(size * 2 * sizeof(INT16)); + if (s->motion_val == NULL) + goto fail; + memset(s->motion_val, 0, size * 2 * sizeof(INT16)); + } + + if (s->h263_pred) { + int y_size, c_size, i, size; + + /* dc values */ + + y_size = (2 * s->mb_width + 2) * (2 * s->mb_height + 2); + c_size = (s->mb_width + 2) * (s->mb_height + 2); + size = y_size + 2 * c_size; + s->dc_val[0] = malloc(size * sizeof(INT16)); + if (s->dc_val[0] == NULL) + goto fail; + s->dc_val[1] = s->dc_val[0] + y_size; + s->dc_val[2] = s->dc_val[1] + c_size; + for(i=0;i<size;i++) + s->dc_val[0][i] = 1024; + + /* ac values */ + s->ac_val[0] = av_mallocz(size * sizeof(INT16) * 16); + if (s->ac_val[0] == NULL) + goto fail; + s->ac_val[1] = s->ac_val[0] + y_size; + s->ac_val[2] = s->ac_val[1] + c_size; + + /* cbp values */ + s->coded_block = av_mallocz(y_size); + if (!s->coded_block) + goto fail; + } + /* default structure is frame */ + s->picture_structure = PICT_FRAME; + + /* init default q matrix (only for mpeg and mjpeg) */ + for(i=0;i<64;i++) { + s->intra_matrix[i] = default_intra_matrix[i]; + s->chroma_intra_matrix[i] = default_intra_matrix[i]; + s->non_intra_matrix[i] = default_non_intra_matrix[i]; + s->chroma_non_intra_matrix[i] = default_non_intra_matrix[i]; + } + s->context_initialized = 1; + return 0; + fail: + if (s->motion_val) + free(s->motion_val); + if (s->dc_val[0]) + free(s->dc_val[0]); + if (s->ac_val[0]) + free(s->ac_val[0]); + if (s->coded_block) + free(s->coded_block); + for(i=0;i<3;i++) { + if (s->last_picture_base[i]) + free(s->last_picture_base[i]); + if (s->next_picture_base[i]) + free(s->next_picture_base[i]); + if (s->aux_picture_base[i]) + free(s->aux_picture_base[i]); + } + return -1; +} + +/* init common structure for both encoder and decoder */ +void MPV_common_end(MpegEncContext *s) +{ + int i; + + if (s->motion_val) + free(s->motion_val); + if (s->h263_pred) { + free(s->dc_val[0]); + free(s->ac_val[0]); + free(s->coded_block); + } + for(i=0;i<3;i++) { + free(s->last_picture_base[i]); + free(s->next_picture_base[i]); + if (s->has_b_frames) + free(s->aux_picture_base[i]); + } + s->context_initialized = 0; +} + +/* init video encoder */ +int MPV_encode_init(AVCodecContext *avctx) +{ + MpegEncContext *s = avctx->priv_data; + + s->bit_rate = avctx->bit_rate; + s->frame_rate = avctx->frame_rate; + s->width = avctx->width; + s->height = avctx->height; + s->gop_size = avctx->gop_size; + if (s->gop_size <= 1) { + s->intra_only = 1; + s->gop_size = 12; + } else { + s->intra_only = 0; + } + s->full_search = motion_estimation_method; + + s->fixed_qscale = (avctx->flags & CODEC_FLAG_QSCALE); + + switch(avctx->codec->id) { + case CODEC_ID_MPEG1VIDEO: + s->out_format = FMT_MPEG1; + break; + case CODEC_ID_MJPEG: + s->out_format = FMT_MJPEG; + s->intra_only = 1; /* force intra only for jpeg */ + if (mjpeg_init(s) < 0) + return -1; + break; + case CODEC_ID_H263: + if (h263_get_picture_format(s->width, s->height) == 7) + return -1; + s->out_format = FMT_H263; + break; + case CODEC_ID_H263P: + s->out_format = FMT_H263; + s->h263_plus = 1; + /* XXX: not unrectricted mv yet */ + break; + case CODEC_ID_RV10: + s->out_format = FMT_H263; + s->h263_rv10 = 1; + break; + case CODEC_ID_OPENDIVX: + s->out_format = FMT_H263; + s->h263_pred = 1; + s->unrestricted_mv = 1; + break; + case CODEC_ID_MSMPEG4: + s->out_format = FMT_H263; + s->h263_msmpeg4 = 1; + s->h263_pred = 1; + s->unrestricted_mv = 1; + break; + default: + return -1; + } + + if (s->out_format == FMT_H263) + h263_encode_init_vlc(s); + + /* init */ + if (MPV_common_init(s) < 0) + return -1; + + /* rate control init */ + rate_control_init(s); + + s->picture_number = 0; + s->fake_picture_number = 0; + /* motion detector init */ + s->f_code = 1; + + return 0; +} + +int MPV_encode_end(AVCodecContext *avctx) +{ + MpegEncContext *s = avctx->priv_data; + +#ifdef STATS + print_stats(); +#endif + MPV_common_end(s); + if (s->out_format == FMT_MJPEG) + mjpeg_close(s); + return 0; +} + +/* draw the edges of width 'w' of an image of size width, height */ +static void draw_edges(UINT8 *buf, int wrap, int width, int height, int w) +{ + UINT8 *ptr, *last_line; + int i; + + last_line = buf + (height - 1) * wrap; + for(i=0;i<w;i++) { + /* top and bottom */ + memcpy(buf - (i + 1) * wrap, buf, width); + memcpy(last_line + (i + 1) * wrap, last_line, width); + } + /* left and right */ + ptr = buf; + for(i=0;i<height;i++) { + memset(ptr - w, ptr[0], w); + memset(ptr + width, ptr[width-1], w); + ptr += wrap; + } + /* corners */ + for(i=0;i<w;i++) { + memset(buf - (i + 1) * wrap - w, buf[0], w); /* top left */ + memset(buf - (i + 1) * wrap + width, buf[width-1], w); /* top right */ + memset(last_line + (i + 1) * wrap - w, last_line[0], w); /* top left */ + memset(last_line + (i + 1) * wrap + width, last_line[width-1], w); /* top right */ + } +} + + +/* generic function for encode/decode called before a frame is coded/decoded */ +void MPV_frame_start(MpegEncContext *s) +{ + int i; + UINT8 *tmp; + + if (s->pict_type == B_TYPE) { + for(i=0;i<3;i++) { + s->current_picture[i] = s->aux_picture[i]; + } + } else { + for(i=0;i<3;i++) { + /* swap next and last */ + tmp = s->last_picture[i]; + s->last_picture[i] = s->next_picture[i]; + s->next_picture[i] = tmp; + s->current_picture[i] = tmp; + } + } +} + +/* generic function for encode/decode called after a frame has been coded/decoded */ +void MPV_frame_end(MpegEncContext *s) +{ + /* draw edge for correct motion prediction if outside */ + if (s->pict_type != B_TYPE) { + draw_edges(s->current_picture[0], s->linesize, s->width, s->height, EDGE_WIDTH); + draw_edges(s->current_picture[1], s->linesize/2, s->width/2, s->height/2, EDGE_WIDTH/2); + draw_edges(s->current_picture[2], s->linesize/2, s->width/2, s->height/2, EDGE_WIDTH/2); + } +} + +int MPV_encode_picture(AVCodecContext *avctx, + unsigned char *buf, int buf_size, void *data) +{ + MpegEncContext *s = avctx->priv_data; + AVPicture *pict = data; + int i, j; + + if (s->fixed_qscale) + s->qscale = avctx->quality; + + init_put_bits(&s->pb, buf, buf_size, NULL, NULL); + + if (!s->intra_only) { + /* first picture of GOP is intra */ + if ((s->picture_number % s->gop_size) == 0) + s->pict_type = I_TYPE; + else + s->pict_type = P_TYPE; + } else { + s->pict_type = I_TYPE; + } + avctx->key_frame = (s->pict_type == I_TYPE); + + MPV_frame_start(s); + + for(i=0;i<3;i++) { + UINT8 *src = pict->data[i]; + UINT8 *dest = s->current_picture[i]; + int src_wrap = pict->linesize[i]; + int dest_wrap = s->linesize; + int w = s->width; + int h = s->height; + + if (i >= 1) { + dest_wrap >>= 1; + w >>= 1; + h >>= 1; + } + + for(j=0;j<h;j++) { + memcpy(dest, src, w); + dest += dest_wrap; + src += src_wrap; + } + s->new_picture[i] = s->current_picture[i]; + } + + encode_picture(s, s->picture_number); + + MPV_frame_end(s); + s->picture_number++; + + if (s->out_format == FMT_MJPEG) + mjpeg_picture_trailer(s); + + flush_put_bits(&s->pb); + s->total_bits += (s->pb.buf_ptr - s->pb.buf) * 8; + avctx->quality = s->qscale; + return s->pb.buf_ptr - s->pb.buf; +} + +static inline int clip(int a, int amin, int amax) +{ + if (a < amin) + return amin; + else if (a > amax) + return amax; + else + return a; +} + +static int dct_quantize(MpegEncContext *s, DCTELEM *block, int n, int qscale); +static int dct_quantize_mmx(MpegEncContext *s, + DCTELEM *block, int n, + int qscale); +static void dct_unquantize(MpegEncContext *s, DCTELEM *block, int n, int qscale); + +/* apply one mpeg motion vector to the three components */ +static inline void mpeg_motion(MpegEncContext *s, + UINT8 *dest_y, UINT8 *dest_cb, UINT8 *dest_cr, + int dest_offset, + UINT8 **ref_picture, int src_offset, + int field_based, op_pixels_func *pix_op, + int motion_x, int motion_y, int h) +{ + UINT8 *ptr; + int dxy, offset, mx, my, src_x, src_y, height, linesize; + + dxy = ((motion_y & 1) << 1) | (motion_x & 1); + src_x = s->mb_x * 16 + (motion_x >> 1); + src_y = s->mb_y * (16 >> field_based) + (motion_y >> 1); + + /* WARNING: do no forget half pels */ + height = s->height >> field_based; + src_x = clip(src_x, -16, s->width); + if (src_x == s->width) + dxy &= ~1; + src_y = clip(src_y, -16, height); + if (src_y == height) + dxy &= ~2; + linesize = s->linesize << field_based; + ptr = ref_picture[0] + (src_y * linesize) + (src_x) + src_offset; + dest_y += dest_offset; + pix_op[dxy](dest_y, ptr, linesize, h); + pix_op[dxy](dest_y + 8, ptr + 8, linesize, h); + + if (s->out_format == FMT_H263) { + dxy = 0; + if ((motion_x & 3) != 0) + dxy |= 1; + if ((motion_y & 3) != 0) + dxy |= 2; + mx = motion_x >> 2; + my = motion_y >> 2; + } else { + mx = motion_x / 2; + my = motion_y / 2; + dxy = ((my & 1) << 1) | (mx & 1); + mx >>= 1; + my >>= 1; + } + + src_x = s->mb_x * 8 + mx; + src_y = s->mb_y * (8 >> field_based) + my; + src_x = clip(src_x, -8, s->width >> 1); + if (src_x == (s->width >> 1)) + dxy &= ~1; + src_y = clip(src_y, -8, height >> 1); + if (src_y == (height >> 1)) + dxy &= ~2; + + offset = (src_y * (linesize >> 1)) + src_x + (src_offset >> 1); + ptr = ref_picture[1] + offset; + pix_op[dxy](dest_cb + (dest_offset >> 1), ptr, linesize >> 1, h >> 1); + ptr = ref_picture[2] + offset; + pix_op[dxy](dest_cr + (dest_offset >> 1), ptr, linesize >> 1, h >> 1); +} + +static inline void MPV_motion(MpegEncContext *s, + UINT8 *dest_y, UINT8 *dest_cb, UINT8 *dest_cr, + int dir, UINT8 **ref_picture, + op_pixels_func *pix_op) +{ + int dxy, offset, mx, my, src_x, src_y, motion_x, motion_y; + int mb_x, mb_y, i; + UINT8 *ptr, *dest; + + mb_x = s->mb_x; + mb_y = s->mb_y; + + switch(s->mv_type) { + case MV_TYPE_16X16: + mpeg_motion(s, dest_y, dest_cb, dest_cr, 0, + ref_picture, 0, + 0, pix_op, + s->mv[dir][0][0], s->mv[dir][0][1], 16); + break; + case MV_TYPE_8X8: + for(i=0;i<4;i++) { + motion_x = s->mv[dir][i][0]; + motion_y = s->mv[dir][i][1]; + + dxy = ((motion_y & 1) << 1) | (motion_x & 1); + src_x = mb_x * 16 + (motion_x >> 1) + (i & 1) * 8; + src_y = mb_y * 16 + (motion_y >> 1) + ((i >> 1) & 1) * 8; + + /* WARNING: do no forget half pels */ + src_x = clip(src_x, -16, s->width); + if (src_x == s->width) + dxy &= ~1; + src_y = clip(src_y, -16, s->height); + if (src_y == s->height) + dxy &= ~2; + + ptr = ref_picture[0] + (src_y * s->linesize) + (src_x); + dest = dest_y + ((i & 1) * 8) + (i >> 1) * 8 * s->linesize; + pix_op[dxy](dest, ptr, s->linesize, 8); + } + /* In case of 8X8, we construct a single chroma motion vector + with a special rounding */ + mx = 0; + my = 0; + for(i=0;i<4;i++) { + mx += s->mv[dir][i][0]; + my += s->mv[dir][i][1]; + } + if (mx >= 0) + mx = (h263_chroma_roundtab[mx & 0xf] + ((mx >> 3) & ~1)); + else { + mx = -mx; + mx = -(h263_chroma_roundtab[mx & 0xf] + ((mx >> 3) & ~1)); + } + if (my >= 0) + my = (h263_chroma_roundtab[my & 0xf] + ((my >> 3) & ~1)); + else { + my = -my; + my = -(h263_chroma_roundtab[my & 0xf] + ((my >> 3) & ~1)); + } + dxy = ((my & 1) << 1) | (mx & 1); + mx >>= 1; + my >>= 1; + + src_x = mb_x * 8 + mx; + src_y = mb_y * 8 + my; + src_x = clip(src_x, -8, s->width/2); + if (src_x == s->width/2) + dxy &= ~1; + src_y = clip(src_y, -8, s->height/2); + if (src_y == s->height/2) + dxy &= ~2; + + offset = (src_y * (s->linesize >> 1)) + src_x; + ptr = ref_picture[1] + offset; + pix_op[dxy](dest_cb, ptr, s->linesize >> 1, 8); + ptr = ref_picture[2] + offset; + pix_op[dxy](dest_cr, ptr, s->linesize >> 1, 8); + break; + case MV_TYPE_FIELD: + if (s->picture_structure == PICT_FRAME) { + /* top field */ + mpeg_motion(s, dest_y, dest_cb, dest_cr, 0, + ref_picture, s->field_select[dir][0] ? s->linesize : 0, + 1, pix_op, + s->mv[dir][0][0], s->mv[dir][0][1], 8); + /* bottom field */ + mpeg_motion(s, dest_y, dest_cb, dest_cr, s->linesize, + ref_picture, s->field_select[dir][1] ? s->linesize : 0, + 1, pix_op, + s->mv[dir][1][0], s->mv[dir][1][1], 8); + } else { + + + } + break; + } +} + + +/* put block[] to dest[] */ +static inline void put_dct(MpegEncContext *s, + DCTELEM *block, int i, UINT8 *dest, int line_size) +{ + if (!s->mpeg2) + dct_unquantize(s, block, i, s->qscale); + j_rev_dct (block); + put_pixels_clamped(block, dest, line_size); +} + +/* add block[] to dest[] */ +static inline void add_dct(MpegEncContext *s, + DCTELEM *block, int i, UINT8 *dest, int line_size) +{ + if (s->block_last_index[i] >= 0) { + if (!s->mpeg2) + dct_unquantize(s, block, i, s->qscale); + j_rev_dct (block); + add_pixels_clamped(block, dest, line_size); + } +} + +/* generic function called after a macroblock has been parsed by the + decoder or after it has been encoded by the encoder. + + Important variables used: + s->mb_intra : true if intra macroblock + s->mv_dir : motion vector direction + s->mv_type : motion vector type + s->mv : motion vector + s->interlaced_dct : true if interlaced dct used (mpeg2) + */ +void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64]) +{ + int mb_x, mb_y, motion_x, motion_y; + int dct_linesize, dct_offset; + op_pixels_func *op_pix; + + mb_x = s->mb_x; + mb_y = s->mb_y; + + /* update DC predictors for P macroblocks */ + if (!s->mb_intra) { + if (s->h263_pred) { + int wrap, x, y, v; + wrap = 2 * s->mb_width + 2; + v = 1024; + x = 2 * mb_x + 1; + y = 2 * mb_y + 1; + s->dc_val[0][(x) + (y) * wrap] = v; + s->dc_val[0][(x + 1) + (y) * wrap] = v; + s->dc_val[0][(x) + (y + 1) * wrap] = v; + s->dc_val[0][(x + 1) + (y + 1) * wrap] = v; + /* ac pred */ + memset(s->ac_val[0][(x) + (y) * wrap], 0, 16 * sizeof(INT16)); + memset(s->ac_val[0][(x + 1) + (y) * wrap], 0, 16 * sizeof(INT16)); + memset(s->ac_val[0][(x) + (y + 1) * wrap], 0, 16 * sizeof(INT16)); + memset(s->ac_val[0][(x + 1) + (y + 1) * wrap], 0, 16 * sizeof(INT16)); + if (s->h263_msmpeg4) { + s->coded_block[(x) + (y) * wrap] = 0; + s->coded_block[(x + 1) + (y) * wrap] = 0; + s->coded_block[(x) + (y + 1) * wrap] = 0; + s->coded_block[(x + 1) + (y + 1) * wrap] = 0; + } + /* chroma */ + wrap = s->mb_width + 2; + x = mb_x + 1; + y = mb_y + 1; + s->dc_val[1][(x) + (y) * wrap] = v; + s->dc_val[2][(x) + (y) * wrap] = v; + /* ac pred */ + memset(s->ac_val[1][(x) + (y) * wrap], 0, 16 * sizeof(INT16)); + memset(s->ac_val[2][(x) + (y) * wrap], 0, 16 * sizeof(INT16)); + } else { + s->last_dc[0] = 128 << s->intra_dc_precision; + s->last_dc[1] = 128 << s->intra_dc_precision; + s->last_dc[2] = 128 << s->intra_dc_precision; + } + } + + /* update motion predictor */ + if (s->out_format == FMT_H263) { + int x, y, wrap; + + x = 2 * mb_x + 1; + y = 2 * mb_y + 1; + wrap = 2 * s->mb_width + 2; + if (s->mb_intra) { + motion_x = 0; + motion_y = 0; + goto motion_init; + } else if (s->mv_type == MV_TYPE_16X16) { + motion_x = s->mv[0][0][0]; + motion_y = s->mv[0][0][1]; + motion_init: + /* no update if 8X8 because it has been done during parsing */ + s->motion_val[(x) + (y) * wrap][0] = motion_x; + s->motion_val[(x) + (y) * wrap][1] = motion_y; + s->motion_val[(x + 1) + (y) * wrap][0] = motion_x; + s->motion_val[(x + 1) + (y) * wrap][1] = motion_y; + s->motion_val[(x) + (y + 1) * wrap][0] = motion_x; + s->motion_val[(x) + (y + 1) * wrap][1] = motion_y; + s->motion_val[(x + 1) + (y + 1) * wrap][0] = motion_x; + s->motion_val[(x + 1) + (y + 1) * wrap][1] = motion_y; + } + } + + if (!s->intra_only) { + UINT8 *dest_y, *dest_cb, *dest_cr; + + dest_y = s->current_picture[0] + (mb_y * 16 * s->linesize) + mb_x * 16; + dest_cb = s->current_picture[1] + (mb_y * 8 * (s->linesize >> 1)) + mb_x * 8; + dest_cr = s->current_picture[2] + (mb_y * 8 * (s->linesize >> 1)) + mb_x * 8; + + if (s->interlaced_dct) { + dct_linesize = s->linesize * 2; + dct_offset = s->linesize; + } else { + dct_linesize = s->linesize; + dct_offset = s->linesize * 8; + } + + if (!s->mb_intra) { + /* motion handling */ + if (!s->no_rounding) + op_pix = put_pixels_tab; + else + op_pix = put_no_rnd_pixels_tab; + + if (s->mv_dir & MV_DIR_FORWARD) { + MPV_motion(s, dest_y, dest_cb, dest_cr, 0, s->last_picture, op_pix); + if (!s->no_rounding) + op_pix = avg_pixels_tab; + else + op_pix = avg_no_rnd_pixels_tab; + } + if (s->mv_dir & MV_DIR_BACKWARD) { + MPV_motion(s, dest_y, dest_cb, dest_cr, 1, s->next_picture, op_pix); + } + + /* add dct residue */ + add_dct(s, block[0], 0, dest_y, dct_linesize); + add_dct(s, block[1], 1, dest_y + 8, dct_linesize); + add_dct(s, block[2], 2, dest_y + dct_offset, dct_linesize); + add_dct(s, block[3], 3, dest_y + dct_offset + 8, dct_linesize); + + add_dct(s, block[4], 4, dest_cb, dct_linesize >> 1); + add_dct(s, block[5], 5, dest_cr, dct_linesize >> 1); + } else { + /* dct only in intra block */ + put_dct(s, block[0], 0, dest_y, dct_linesize); + put_dct(s, block[1], 1, dest_y + 8, dct_linesize); + put_dct(s, block[2], 2, dest_y + dct_offset, dct_linesize); + put_dct(s, block[3], 3, dest_y + dct_offset + 8, dct_linesize); + + put_dct(s, block[4], 4, dest_cb, dct_linesize >> 1); + put_dct(s, block[5], 5, dest_cr, dct_linesize >> 1); + } + } +} + +static void encode_picture(MpegEncContext *s, int picture_number) +{ + int mb_x, mb_y, wrap; + UINT8 *ptr; + DCTELEM block[6][64]; + int i, motion_x, motion_y; + + s->picture_number = picture_number; + if (!s->fixed_qscale) + s->qscale = rate_estimate_qscale(s); + + /* precompute matrix */ + if (s->out_format == FMT_MJPEG) { + /* for mjpeg, we do include qscale in the matrix */ + s->intra_matrix[0] = default_intra_matrix[0]; + for(i=1;i<64;i++) + s->intra_matrix[i] = (default_intra_matrix[i] * s->qscale) >> 3; + convert_matrix(s->q_intra_matrix, s->intra_matrix, 8); + } else { + convert_matrix(s->q_intra_matrix, s->intra_matrix, s->qscale); + convert_matrix(s->q_non_intra_matrix, s->non_intra_matrix, s->qscale); + } + + switch(s->out_format) { + case FMT_MJPEG: + mjpeg_picture_header(s); + break; + case FMT_H263: + if (s->h263_msmpeg4) + msmpeg4_encode_picture_header(s, picture_number); + else if (s->h263_pred) + mpeg4_encode_picture_header(s, picture_number); + else if (s->h263_rv10) + rv10_encode_picture_header(s, picture_number); + else + h263_encode_picture_header(s, picture_number); + break; + case FMT_MPEG1: + mpeg1_encode_picture_header(s, picture_number); + break; + } + + /* init last dc values */ + /* note: quant matrix value (8) is implied here */ + s->last_dc[0] = 128; + s->last_dc[1] = 128; + s->last_dc[2] = 128; + s->mb_incr = 1; + s->last_mv[0][0][0] = 0; + s->last_mv[0][0][1] = 0; + s->mv_type = MV_TYPE_16X16; + s->mv_dir = MV_DIR_FORWARD; + + for(mb_y=0; mb_y < s->mb_height; mb_y++) { + for(mb_x=0; mb_x < s->mb_width; mb_x++) { + + s->mb_x = mb_x; + s->mb_y = mb_y; + + /* compute motion vector and macro block type (intra or non intra) */ + motion_x = 0; + motion_y = 0; + if (s->pict_type == P_TYPE) { + s->mb_intra = estimate_motion(s, mb_x, mb_y, + &motion_x, + &motion_y); + } else { + s->mb_intra = 1; + } + + /* get the pixels */ + wrap = s->linesize; + ptr = s->new_picture[0] + (mb_y * 16 * wrap) + mb_x * 16; + get_pixels(block[0], ptr, wrap); + get_pixels(block[1], ptr + 8, wrap); + get_pixels(block[2], ptr + 8 * wrap, wrap); + get_pixels(block[3], ptr + 8 * wrap + 8, wrap); + wrap = s->linesize >> 1; + ptr = s->new_picture[1] + (mb_y * 8 * wrap) + mb_x * 8; + get_pixels(block[4], ptr, wrap); + + wrap = s->linesize >> 1; + ptr = s->new_picture[2] + (mb_y * 8 * wrap) + mb_x * 8; + get_pixels(block[5], ptr, wrap); + + /* subtract previous frame if non intra */ + if (!s->mb_intra) { + int dxy, offset, mx, my; + + dxy = ((motion_y & 1) << 1) | (motion_x & 1); + ptr = s->last_picture[0] + + ((mb_y * 16 + (motion_y >> 1)) * s->linesize) + + (mb_x * 16 + (motion_x >> 1)); + + sub_pixels_2(block[0], ptr, s->linesize, dxy); + sub_pixels_2(block[1], ptr + 8, s->linesize, dxy); + sub_pixels_2(block[2], ptr + s->linesize * 8, s->linesize, dxy); + sub_pixels_2(block[3], ptr + 8 + s->linesize * 8, s->linesize ,dxy); + + if (s->out_format == FMT_H263) { + /* special rounding for h263 */ + dxy = 0; + if ((motion_x & 3) != 0) + dxy |= 1; + if ((motion_y & 3) != 0) + dxy |= 2; + mx = motion_x >> 2; + my = motion_y >> 2; + } else { + mx = motion_x / 2; + my = motion_y / 2; + dxy = ((my & 1) << 1) | (mx & 1); + mx >>= 1; + my >>= 1; + } + offset = ((mb_y * 8 + my) * (s->linesize >> 1)) + (mb_x * 8 + mx); + ptr = s->last_picture[1] + offset; + sub_pixels_2(block[4], ptr, s->linesize >> 1, dxy); + ptr = s->last_picture[2] + offset; + sub_pixels_2(block[5], ptr, s->linesize >> 1, dxy); + } + + /* DCT & quantize */ + if (s->h263_msmpeg4) { + msmpeg4_dc_scale(s); + } else if (s->h263_pred) { + h263_dc_scale(s); + } else { + /* default quantization values */ + s->y_dc_scale = 8; + s->c_dc_scale = 8; + } + + for(i=0;i<6;i++) { + int last_index; + if (av_fdct == jpeg_fdct_ifast) + last_index = dct_quantize(s, block[i], i, s->qscale); + else + last_index = dct_quantize_mmx(s, block[i], i, s->qscale); + s->block_last_index[i] = last_index; + } + + /* huffman encode */ + switch(s->out_format) { + case FMT_MPEG1: + mpeg1_encode_mb(s, block, motion_x, motion_y); + break; + case FMT_H263: + if (s->h263_msmpeg4) + msmpeg4_encode_mb(s, block, motion_x, motion_y); + else + h263_encode_mb(s, block, motion_x, motion_y); + break; + case FMT_MJPEG: + mjpeg_encode_mb(s, block); + break; + } + + /* decompress blocks so that we keep the state of the decoder */ + s->mv[0][0][0] = motion_x; + s->mv[0][0][1] = motion_y; + + MPV_decode_mb(s, block); + } + } +} + +static int dct_quantize(MpegEncContext *s, + DCTELEM *block, int n, + int qscale) +{ + int i, j, level, last_non_zero, q; + const int *qmat; + + av_fdct (block); + + if (s->mb_intra) { + if (n < 4) + q = s->y_dc_scale; + else + q = s->c_dc_scale; + q = q << 3; + + /* note: block[0] is assumed to be positive */ + block[0] = (block[0] + (q >> 1)) / q; + i = 1; + last_non_zero = 0; + if (s->out_format == FMT_H263) { + qmat = s->q_non_intra_matrix; + } else { + qmat = s->q_intra_matrix; + } + } else { + i = 0; + last_non_zero = -1; + qmat = s->q_non_intra_matrix; + } + + for(;i<64;i++) { + j = zigzag_direct[i]; + level = block[j]; + level = level * qmat[j]; +#ifdef PARANOID + { + static int count = 0; + int level1, level2, qmat1; + double val; + if (qmat == s->q_non_intra_matrix) { + qmat1 = default_non_intra_matrix[j] * s->qscale; + } else { + qmat1 = default_intra_matrix[j] * s->qscale; + } + if (av_fdct != jpeg_fdct_ifast) + val = ((double)block[j] * 8.0) / (double)qmat1; + else + val = ((double)block[j] * 8.0 * 2048.0) / + ((double)qmat1 * aanscales[j]); + level1 = (int)val; + level2 = level / (1 << (QMAT_SHIFT - 3)); + if (level1 != level2) { + fprintf(stderr, "%d: quant error qlevel=%d wanted=%d level=%d qmat1=%d qmat=%d wantedf=%0.6f\n", + count, level2, level1, block[j], qmat1, qmat[j], + val); + count++; + } + + } +#endif + /* XXX: slight error for the low range. Test should be equivalent to + (level <= -(1 << (QMAT_SHIFT - 3)) || level >= (1 << + (QMAT_SHIFT - 3))) + */ + if (((level << (31 - (QMAT_SHIFT - 3))) >> (31 - (QMAT_SHIFT - 3))) != + level) { + level = level / (1 << (QMAT_SHIFT - 3)); + /* XXX: currently, this code is not optimal. the range should be: + mpeg1: -255..255 + mpeg2: -2048..2047 + h263: -128..127 + mpeg4: -2048..2047 + */ + if (level > 127) + level = 127; + else if (level < -128) + level = -128; + block[j] = level; + last_non_zero = i; + } else { + block[j] = 0; + } + } + return last_non_zero; +} + +static int dct_quantize_mmx(MpegEncContext *s, + DCTELEM *block, int n, + int qscale) +{ + int i, j, level, last_non_zero, q; + const int *qmat; + + av_fdct (block); + + if (s->mb_intra) { + if (n < 4) + q = s->y_dc_scale; + else + q = s->c_dc_scale; + + /* note: block[0] is assumed to be positive */ + block[0] = (block[0] + (q >> 1)) / q; + i = 1; + last_non_zero = 0; + if (s->out_format == FMT_H263) { + qmat = s->q_non_intra_matrix; + } else { + qmat = s->q_intra_matrix; + } + } else { + i = 0; + last_non_zero = -1; + qmat = s->q_non_intra_matrix; + } + + for(;i<64;i++) { + j = zigzag_direct[i]; + level = block[j]; + level = level * qmat[j]; + /* XXX: slight error for the low range. Test should be equivalent to + (level <= -(1 << (QMAT_SHIFT_MMX - 3)) || level >= (1 << + (QMAT_SHIFT_MMX - 3))) + */ + if (((level << (31 - (QMAT_SHIFT_MMX - 3))) >> (31 - (QMAT_SHIFT_MMX - 3))) != + level) { + level = level / (1 << (QMAT_SHIFT_MMX - 3)); + /* XXX: currently, this code is not optimal. the range should be: + mpeg1: -255..255 + mpeg2: -2048..2047 + h263: -128..127 + mpeg4: -2048..2047 + */ + if (level > 127) + level = 127; + else if (level < -128) + level = -128; + block[j] = level; + last_non_zero = i; + } else { + block[j] = 0; + } + } + return last_non_zero; +} + +static void dct_unquantize(MpegEncContext *s, + DCTELEM *block, int n, int qscale) +{ + int i, level; + const UINT16 *quant_matrix; + + if (s->mb_intra) { + if (n < 4) + block[0] = block[0] * s->y_dc_scale; + else + block[0] = block[0] * s->c_dc_scale; + if (s->out_format == FMT_H263) { + i = 1; + goto unquant_even; + } + /* XXX: only mpeg1 */ + quant_matrix = s->intra_matrix; + for(i=1;i<64;i++) { + level = block[i]; + if (level) { + if (level < 0) { + level = -level; + level = (int)(level * qscale * quant_matrix[i]) >> 3; + level = (level - 1) | 1; + level = -level; + } else { + level = (int)(level * qscale * quant_matrix[i]) >> 3; + level = (level - 1) | 1; + } +#ifdef PARANOID + if (level < -2048 || level > 2047) + fprintf(stderr, "unquant error %d %d\n", i, level); +#endif + block[i] = level; + } + } + } else { + i = 0; + unquant_even: + quant_matrix = s->non_intra_matrix; + for(;i<64;i++) { + level = block[i]; + if (level) { + if (level < 0) { + level = -level; + level = (((level << 1) + 1) * qscale * + ((int) (quant_matrix[i]))) >> 4; + level = (level - 1) | 1; + level = -level; + } else { + level = (((level << 1) + 1) * qscale * + ((int) (quant_matrix[i]))) >> 4; + level = (level - 1) | 1; + } +#ifdef PARANOID + if (level < -2048 || level > 2047) + fprintf(stderr, "unquant error %d %d\n", i, level); +#endif + block[i] = level; + } + } + } +} + + +/* rate control */ + +/* an I frame is I_FRAME_SIZE_RATIO bigger than a P frame */ +#define I_FRAME_SIZE_RATIO 3.0 +#define QSCALE_K 20 + +static void rate_control_init(MpegEncContext *s) +{ + s->wanted_bits = 0; + + if (s->intra_only) { + s->I_frame_bits = ((INT64)s->bit_rate * FRAME_RATE_BASE) / s->frame_rate; + s->P_frame_bits = s->I_frame_bits; + } else { + s->P_frame_bits = (int) ((float)(s->gop_size * s->bit_rate) / + (float)((float)s->frame_rate / FRAME_RATE_BASE * (I_FRAME_SIZE_RATIO + s->gop_size - 1))); + s->I_frame_bits = (int)(s->P_frame_bits * I_FRAME_SIZE_RATIO); + } + +#if defined(DEBUG) + printf("I_frame_size=%d P_frame_size=%d\n", + s->I_frame_bits, s->P_frame_bits); +#endif +} + + +/* + * This heuristic is rather poor, but at least we do not have to + * change the qscale at every macroblock. + */ +static int rate_estimate_qscale(MpegEncContext *s) +{ + long long total_bits = s->total_bits; + float q; + int qscale, diff, qmin; + + if (s->pict_type == I_TYPE) { + s->wanted_bits += s->I_frame_bits; + } else { + s->wanted_bits += s->P_frame_bits; + } + diff = s->wanted_bits - total_bits; + q = 31.0 - (float)diff / (QSCALE_K * s->mb_height * s->mb_width); + /* adjust for I frame */ + if (s->pict_type == I_TYPE && !s->intra_only) { + q /= I_FRAME_SIZE_RATIO; + } + + /* using a too small Q scale leeds to problems in mpeg1 and h263 + because AC coefficients are clamped to 255 or 127 */ + qmin = 3; + if (q < qmin) + q = qmin; + else if (q > 31) + q = 31; + qscale = (int)(q + 0.5); +#if defined(DEBUG) + printf("%d: total=%Ld br=%0.1f diff=%d qest=%0.1f\n", + s->picture_number, + total_bits, + (float)s->frame_rate / FRAME_RATE_BASE * + total_bits / s->picture_number, + diff, q); +#endif + return qscale; +} + +AVCodec mpeg1video_encoder = { + "mpeg1video", + CODEC_TYPE_VIDEO, + CODEC_ID_MPEG1VIDEO, + sizeof(MpegEncContext), + MPV_encode_init, + MPV_encode_picture, + MPV_encode_end, +}; + +AVCodec h263_encoder = { + "h263", + CODEC_TYPE_VIDEO, + CODEC_ID_H263, + sizeof(MpegEncContext), + MPV_encode_init, + MPV_encode_picture, + MPV_encode_end, +}; + +AVCodec h263p_encoder = { + "h263p", + CODEC_TYPE_VIDEO, + CODEC_ID_H263P, + sizeof(MpegEncContext), + MPV_encode_init, + MPV_encode_picture, + MPV_encode_end, +}; + +AVCodec rv10_encoder = { + "rv10", + CODEC_TYPE_VIDEO, + CODEC_ID_RV10, + sizeof(MpegEncContext), + MPV_encode_init, + MPV_encode_picture, + MPV_encode_end, +}; + +AVCodec mjpeg_encoder = { + "mjpeg", + CODEC_TYPE_VIDEO, + CODEC_ID_MJPEG, + sizeof(MpegEncContext), + MPV_encode_init, + MPV_encode_picture, + MPV_encode_end, +}; + +AVCodec opendivx_encoder = { + "opendivx", + CODEC_TYPE_VIDEO, + CODEC_ID_OPENDIVX, + sizeof(MpegEncContext), + MPV_encode_init, + MPV_encode_picture, + MPV_encode_end, +}; + +AVCodec msmpeg4_encoder = { + "msmpeg4", + CODEC_TYPE_VIDEO, + CODEC_ID_MSMPEG4, + sizeof(MpegEncContext), + MPV_encode_init, + MPV_encode_picture, + MPV_encode_end, +}; |