| /* |
| * Duck TrueMotion 1.0 Decoder |
| * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file libavcodec/truemotion1.c |
| * Duck TrueMotion v1 Video Decoder by |
| * Alex Beregszaszi and |
| * Mike Melanson (melanson@pcisys.net) |
| * |
| * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and |
| * outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "avcodec.h" |
| #include "dsputil.h" |
| |
| #include "truemotion1data.h" |
| |
| typedef struct TrueMotion1Context { |
| AVCodecContext *avctx; |
| AVFrame frame; |
| |
| const uint8_t *buf; |
| int size; |
| |
| const uint8_t *mb_change_bits; |
| int mb_change_bits_row_size; |
| const uint8_t *index_stream; |
| int index_stream_size; |
| |
| int flags; |
| int x, y, w, h; |
| |
| uint32_t y_predictor_table[1024]; |
| uint32_t c_predictor_table[1024]; |
| uint32_t fat_y_predictor_table[1024]; |
| uint32_t fat_c_predictor_table[1024]; |
| |
| int compression; |
| int block_type; |
| int block_width; |
| int block_height; |
| |
| int16_t ydt[8]; |
| int16_t cdt[8]; |
| int16_t fat_ydt[8]; |
| int16_t fat_cdt[8]; |
| |
| int last_deltaset, last_vectable; |
| |
| unsigned int *vert_pred; |
| |
| } TrueMotion1Context; |
| |
| #define FLAG_SPRITE 32 |
| #define FLAG_KEYFRAME 16 |
| #define FLAG_INTERFRAME 8 |
| #define FLAG_INTERPOLATED 4 |
| |
| struct frame_header { |
| uint8_t header_size; |
| uint8_t compression; |
| uint8_t deltaset; |
| uint8_t vectable; |
| uint16_t ysize; |
| uint16_t xsize; |
| uint16_t checksum; |
| uint8_t version; |
| uint8_t header_type; |
| uint8_t flags; |
| uint8_t control; |
| uint16_t xoffset; |
| uint16_t yoffset; |
| uint16_t width; |
| uint16_t height; |
| }; |
| |
| #define ALGO_NOP 0 |
| #define ALGO_RGB16V 1 |
| #define ALGO_RGB16H 2 |
| #define ALGO_RGB24H 3 |
| |
| /* these are the various block sizes that can occupy a 4x4 block */ |
| #define BLOCK_2x2 0 |
| #define BLOCK_2x4 1 |
| #define BLOCK_4x2 2 |
| #define BLOCK_4x4 3 |
| |
| typedef struct comp_types { |
| int algorithm; |
| int block_width; // vres |
| int block_height; // hres |
| int block_type; |
| } comp_types; |
| |
| /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */ |
| static const comp_types compression_types[17] = { |
| { ALGO_NOP, 0, 0, 0 }, |
| |
| { ALGO_RGB16V, 4, 4, BLOCK_4x4 }, |
| { ALGO_RGB16H, 4, 4, BLOCK_4x4 }, |
| { ALGO_RGB16V, 4, 2, BLOCK_4x2 }, |
| { ALGO_RGB16H, 4, 2, BLOCK_4x2 }, |
| |
| { ALGO_RGB16V, 2, 4, BLOCK_2x4 }, |
| { ALGO_RGB16H, 2, 4, BLOCK_2x4 }, |
| { ALGO_RGB16V, 2, 2, BLOCK_2x2 }, |
| { ALGO_RGB16H, 2, 2, BLOCK_2x2 }, |
| |
| { ALGO_NOP, 4, 4, BLOCK_4x4 }, |
| { ALGO_RGB24H, 4, 4, BLOCK_4x4 }, |
| { ALGO_NOP, 4, 2, BLOCK_4x2 }, |
| { ALGO_RGB24H, 4, 2, BLOCK_4x2 }, |
| |
| { ALGO_NOP, 2, 4, BLOCK_2x4 }, |
| { ALGO_RGB24H, 2, 4, BLOCK_2x4 }, |
| { ALGO_NOP, 2, 2, BLOCK_2x2 }, |
| { ALGO_RGB24H, 2, 2, BLOCK_2x2 } |
| }; |
| |
| static void select_delta_tables(TrueMotion1Context *s, int delta_table_index) |
| { |
| int i; |
| |
| if (delta_table_index > 3) |
| return; |
| |
| memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t)); |
| memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t)); |
| memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t)); |
| memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t)); |
| |
| /* Y skinny deltas need to be halved for some reason; maybe the |
| * skinny Y deltas should be modified */ |
| for (i = 0; i < 8; i++) |
| { |
| /* drop the lsb before dividing by 2-- net effect: round down |
| * when dividing a negative number (e.g., -3/2 = -2, not -1) */ |
| s->ydt[i] &= 0xFFFE; |
| s->ydt[i] /= 2; |
| } |
| } |
| |
| #ifdef WORDS_BIGENDIAN |
| static int make_ydt15_entry(int p2, int p1, int16_t *ydt) |
| #else |
| static int make_ydt15_entry(int p1, int p2, int16_t *ydt) |
| #endif |
| { |
| int lo, hi; |
| |
| lo = ydt[p1]; |
| lo += (lo << 5) + (lo << 10); |
| hi = ydt[p2]; |
| hi += (hi << 5) + (hi << 10); |
| return (lo + (hi << 16)) << 1; |
| } |
| |
| #ifdef WORDS_BIGENDIAN |
| static int make_cdt15_entry(int p2, int p1, int16_t *cdt) |
| #else |
| static int make_cdt15_entry(int p1, int p2, int16_t *cdt) |
| #endif |
| { |
| int r, b, lo; |
| |
| b = cdt[p2]; |
| r = cdt[p1] << 10; |
| lo = b + r; |
| return (lo + (lo << 16)) << 1; |
| } |
| |
| #ifdef WORDS_BIGENDIAN |
| static int make_ydt16_entry(int p2, int p1, int16_t *ydt) |
| #else |
| static int make_ydt16_entry(int p1, int p2, int16_t *ydt) |
| #endif |
| { |
| int lo, hi; |
| |
| lo = ydt[p1]; |
| lo += (lo << 6) + (lo << 11); |
| hi = ydt[p2]; |
| hi += (hi << 6) + (hi << 11); |
| return (lo + (hi << 16)) << 1; |
| } |
| |
| #ifdef WORDS_BIGENDIAN |
| static int make_cdt16_entry(int p2, int p1, int16_t *cdt) |
| #else |
| static int make_cdt16_entry(int p1, int p2, int16_t *cdt) |
| #endif |
| { |
| int r, b, lo; |
| |
| b = cdt[p2]; |
| r = cdt[p1] << 11; |
| lo = b + r; |
| return (lo + (lo << 16)) << 1; |
| } |
| |
| #ifdef WORDS_BIGENDIAN |
| static int make_ydt24_entry(int p2, int p1, int16_t *ydt) |
| #else |
| static int make_ydt24_entry(int p1, int p2, int16_t *ydt) |
| #endif |
| { |
| int lo, hi; |
| |
| lo = ydt[p1]; |
| hi = ydt[p2]; |
| return (lo + (hi << 8) + (hi << 16)) << 1; |
| } |
| |
| #ifdef WORDS_BIGENDIAN |
| static int make_cdt24_entry(int p2, int p1, int16_t *cdt) |
| #else |
| static int make_cdt24_entry(int p1, int p2, int16_t *cdt) |
| #endif |
| { |
| int r, b; |
| |
| b = cdt[p2]; |
| r = cdt[p1]<<16; |
| return (b+r) << 1; |
| } |
| |
| static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table) |
| { |
| int len, i, j; |
| unsigned char delta_pair; |
| |
| for (i = 0; i < 1024; i += 4) |
| { |
| len = *sel_vector_table++ / 2; |
| for (j = 0; j < len; j++) |
| { |
| delta_pair = *sel_vector_table++; |
| s->y_predictor_table[i+j] = 0xfffffffe & |
| make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); |
| s->c_predictor_table[i+j] = 0xfffffffe & |
| make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); |
| } |
| s->y_predictor_table[i+(j-1)] |= 1; |
| s->c_predictor_table[i+(j-1)] |= 1; |
| } |
| } |
| |
| static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table) |
| { |
| int len, i, j; |
| unsigned char delta_pair; |
| |
| for (i = 0; i < 1024; i += 4) |
| { |
| len = *sel_vector_table++ / 2; |
| for (j = 0; j < len; j++) |
| { |
| delta_pair = *sel_vector_table++; |
| s->y_predictor_table[i+j] = 0xfffffffe & |
| make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); |
| s->c_predictor_table[i+j] = 0xfffffffe & |
| make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); |
| } |
| s->y_predictor_table[i+(j-1)] |= 1; |
| s->c_predictor_table[i+(j-1)] |= 1; |
| } |
| } |
| |
| static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table) |
| { |
| int len, i, j; |
| unsigned char delta_pair; |
| |
| for (i = 0; i < 1024; i += 4) |
| { |
| len = *sel_vector_table++ / 2; |
| for (j = 0; j < len; j++) |
| { |
| delta_pair = *sel_vector_table++; |
| s->y_predictor_table[i+j] = 0xfffffffe & |
| make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); |
| s->c_predictor_table[i+j] = 0xfffffffe & |
| make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); |
| s->fat_y_predictor_table[i+j] = 0xfffffffe & |
| make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt); |
| s->fat_c_predictor_table[i+j] = 0xfffffffe & |
| make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt); |
| } |
| s->y_predictor_table[i+(j-1)] |= 1; |
| s->c_predictor_table[i+(j-1)] |= 1; |
| s->fat_y_predictor_table[i+(j-1)] |= 1; |
| s->fat_c_predictor_table[i+(j-1)] |= 1; |
| } |
| } |
| |
| /* Returns the number of bytes consumed from the bytestream. Returns -1 if |
| * there was an error while decoding the header */ |
| static int truemotion1_decode_header(TrueMotion1Context *s) |
| { |
| int i; |
| struct frame_header header; |
| uint8_t header_buffer[128]; /* logical maximum size of the header */ |
| const uint8_t *sel_vector_table; |
| |
| /* There is 1 change bit per 4 pixels, so each change byte represents |
| * 32 pixels; divide width by 4 to obtain the number of change bits and |
| * then round up to the nearest byte. */ |
| s->mb_change_bits_row_size = ((s->avctx->width >> 2) + 7) >> 3; |
| |
| header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f; |
| if (s->buf[0] < 0x10) |
| { |
| av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]); |
| return -1; |
| } |
| |
| /* unscramble the header bytes with a XOR operation */ |
| memset(header_buffer, 0, 128); |
| for (i = 1; i < header.header_size; i++) |
| header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1]; |
| |
| header.compression = header_buffer[0]; |
| header.deltaset = header_buffer[1]; |
| header.vectable = header_buffer[2]; |
| header.ysize = AV_RL16(&header_buffer[3]); |
| header.xsize = AV_RL16(&header_buffer[5]); |
| header.checksum = AV_RL16(&header_buffer[7]); |
| header.version = header_buffer[9]; |
| header.header_type = header_buffer[10]; |
| header.flags = header_buffer[11]; |
| header.control = header_buffer[12]; |
| |
| /* Version 2 */ |
| if (header.version >= 2) |
| { |
| if (header.header_type > 3) |
| { |
| av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type); |
| return -1; |
| } else if ((header.header_type == 2) || (header.header_type == 3)) { |
| s->flags = header.flags; |
| if (!(s->flags & FLAG_INTERFRAME)) |
| s->flags |= FLAG_KEYFRAME; |
| } else |
| s->flags = FLAG_KEYFRAME; |
| } else /* Version 1 */ |
| s->flags = FLAG_KEYFRAME; |
| |
| if (s->flags & FLAG_SPRITE) { |
| av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n"); |
| /* FIXME header.width, height, xoffset and yoffset aren't initialized */ |
| #if 0 |
| s->w = header.width; |
| s->h = header.height; |
| s->x = header.xoffset; |
| s->y = header.yoffset; |
| #else |
| return -1; |
| #endif |
| } else { |
| s->w = header.xsize; |
| s->h = header.ysize; |
| if (header.header_type < 2) { |
| if ((s->w < 213) && (s->h >= 176)) |
| { |
| s->flags |= FLAG_INTERPOLATED; |
| av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n"); |
| } |
| } |
| } |
| |
| if (header.compression >= 17) { |
| av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression); |
| return -1; |
| } |
| |
| if ((header.deltaset != s->last_deltaset) || |
| (header.vectable != s->last_vectable)) |
| select_delta_tables(s, header.deltaset); |
| |
| if ((header.compression & 1) && header.header_type) |
| sel_vector_table = pc_tbl2; |
| else { |
| if (header.vectable < 4) |
| sel_vector_table = tables[header.vectable - 1]; |
| else { |
| av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable); |
| return -1; |
| } |
| } |
| |
| // FIXME: where to place this ?!?! |
| if (compression_types[header.compression].algorithm == ALGO_RGB24H) |
| s->avctx->pix_fmt = PIX_FMT_RGB32; |
| else |
| s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well |
| |
| if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable)) |
| { |
| if (compression_types[header.compression].algorithm == ALGO_RGB24H) |
| gen_vector_table24(s, sel_vector_table); |
| else |
| if (s->avctx->pix_fmt == PIX_FMT_RGB555) |
| gen_vector_table15(s, sel_vector_table); |
| else |
| gen_vector_table16(s, sel_vector_table); |
| } |
| |
| /* set up pointers to the other key data chunks */ |
| s->mb_change_bits = s->buf + header.header_size; |
| if (s->flags & FLAG_KEYFRAME) { |
| /* no change bits specified for a keyframe; only index bytes */ |
| s->index_stream = s->mb_change_bits; |
| } else { |
| /* one change bit per 4x4 block */ |
| s->index_stream = s->mb_change_bits + |
| (s->mb_change_bits_row_size * (s->avctx->height >> 2)); |
| } |
| s->index_stream_size = s->size - (s->index_stream - s->buf); |
| |
| s->last_deltaset = header.deltaset; |
| s->last_vectable = header.vectable; |
| s->compression = header.compression; |
| s->block_width = compression_types[header.compression].block_width; |
| s->block_height = compression_types[header.compression].block_height; |
| s->block_type = compression_types[header.compression].block_type; |
| |
| if (s->avctx->debug & FF_DEBUG_PICT_INFO) |
| av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n", |
| s->last_deltaset, s->last_vectable, s->compression, s->block_width, |
| s->block_height, s->block_type, |
| s->flags & FLAG_KEYFRAME ? " KEY" : "", |
| s->flags & FLAG_INTERFRAME ? " INTER" : "", |
| s->flags & FLAG_SPRITE ? " SPRITE" : "", |
| s->flags & FLAG_INTERPOLATED ? " INTERPOL" : ""); |
| |
| return header.header_size; |
| } |
| |
| static av_cold int truemotion1_decode_init(AVCodecContext *avctx) |
| { |
| TrueMotion1Context *s = avctx->priv_data; |
| |
| s->avctx = avctx; |
| |
| // FIXME: it may change ? |
| // if (avctx->bits_per_sample == 24) |
| // avctx->pix_fmt = PIX_FMT_RGB24; |
| // else |
| // avctx->pix_fmt = PIX_FMT_RGB555; |
| |
| s->frame.data[0] = NULL; |
| |
| /* there is a vertical predictor for each pixel in a line; each vertical |
| * predictor is 0 to start with */ |
| s->vert_pred = |
| (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int)); |
| |
| return 0; |
| } |
| |
| /* |
| Block decoding order: |
| |
| dxi: Y-Y |
| dxic: Y-C-Y |
| dxic2: Y-C-Y-C |
| |
| hres,vres,i,i%vres (0 < i < 4) |
| 2x2 0: 0 dxic2 |
| 2x2 1: 1 dxi |
| 2x2 2: 0 dxic2 |
| 2x2 3: 1 dxi |
| 2x4 0: 0 dxic2 |
| 2x4 1: 1 dxi |
| 2x4 2: 2 dxi |
| 2x4 3: 3 dxi |
| 4x2 0: 0 dxic |
| 4x2 1: 1 dxi |
| 4x2 2: 0 dxic |
| 4x2 3: 1 dxi |
| 4x4 0: 0 dxic |
| 4x4 1: 1 dxi |
| 4x4 2: 2 dxi |
| 4x4 3: 3 dxi |
| */ |
| |
| #define GET_NEXT_INDEX() \ |
| {\ |
| if (index_stream_index >= s->index_stream_size) { \ |
| av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \ |
| return; \ |
| } \ |
| index = s->index_stream[index_stream_index++] * 4; \ |
| } |
| |
| #define APPLY_C_PREDICTOR() \ |
| predictor_pair = s->c_predictor_table[index]; \ |
| horiz_pred += (predictor_pair >> 1); \ |
| if (predictor_pair & 1) { \ |
| GET_NEXT_INDEX() \ |
| if (!index) { \ |
| GET_NEXT_INDEX() \ |
| predictor_pair = s->c_predictor_table[index]; \ |
| horiz_pred += ((predictor_pair >> 1) * 5); \ |
| if (predictor_pair & 1) \ |
| GET_NEXT_INDEX() \ |
| else \ |
| index++; \ |
| } \ |
| } else \ |
| index++; |
| |
| #define APPLY_C_PREDICTOR_24() \ |
| predictor_pair = s->c_predictor_table[index]; \ |
| horiz_pred += (predictor_pair >> 1); \ |
| if (predictor_pair & 1) { \ |
| GET_NEXT_INDEX() \ |
| if (!index) { \ |
| GET_NEXT_INDEX() \ |
| predictor_pair = s->fat_c_predictor_table[index]; \ |
| horiz_pred += (predictor_pair >> 1); \ |
| if (predictor_pair & 1) \ |
| GET_NEXT_INDEX() \ |
| else \ |
| index++; \ |
| } \ |
| } else \ |
| index++; |
| |
| |
| #define APPLY_Y_PREDICTOR() \ |
| predictor_pair = s->y_predictor_table[index]; \ |
| horiz_pred += (predictor_pair >> 1); \ |
| if (predictor_pair & 1) { \ |
| GET_NEXT_INDEX() \ |
| if (!index) { \ |
| GET_NEXT_INDEX() \ |
| predictor_pair = s->y_predictor_table[index]; \ |
| horiz_pred += ((predictor_pair >> 1) * 5); \ |
| if (predictor_pair & 1) \ |
| GET_NEXT_INDEX() \ |
| else \ |
| index++; \ |
| } \ |
| } else \ |
| index++; |
| |
| #define APPLY_Y_PREDICTOR_24() \ |
| predictor_pair = s->y_predictor_table[index]; \ |
| horiz_pred += (predictor_pair >> 1); \ |
| if (predictor_pair & 1) { \ |
| GET_NEXT_INDEX() \ |
| if (!index) { \ |
| GET_NEXT_INDEX() \ |
| predictor_pair = s->fat_y_predictor_table[index]; \ |
| horiz_pred += (predictor_pair >> 1); \ |
| if (predictor_pair & 1) \ |
| GET_NEXT_INDEX() \ |
| else \ |
| index++; \ |
| } \ |
| } else \ |
| index++; |
| |
| #define OUTPUT_PIXEL_PAIR() \ |
| *current_pixel_pair = *vert_pred + horiz_pred; \ |
| *vert_pred++ = *current_pixel_pair++; |
| |
| static void truemotion1_decode_16bit(TrueMotion1Context *s) |
| { |
| int y; |
| int pixels_left; /* remaining pixels on this line */ |
| unsigned int predictor_pair; |
| unsigned int horiz_pred; |
| unsigned int *vert_pred; |
| unsigned int *current_pixel_pair; |
| unsigned char *current_line = s->frame.data[0]; |
| int keyframe = s->flags & FLAG_KEYFRAME; |
| |
| /* these variables are for managing the stream of macroblock change bits */ |
| const unsigned char *mb_change_bits = s->mb_change_bits; |
| unsigned char mb_change_byte; |
| unsigned char mb_change_byte_mask; |
| int mb_change_index; |
| |
| /* these variables are for managing the main index stream */ |
| int index_stream_index = 0; /* yes, the index into the index stream */ |
| int index; |
| |
| /* clean out the line buffer */ |
| memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int)); |
| |
| GET_NEXT_INDEX(); |
| |
| for (y = 0; y < s->avctx->height; y++) { |
| |
| /* re-init variables for the next line iteration */ |
| horiz_pred = 0; |
| current_pixel_pair = (unsigned int *)current_line; |
| vert_pred = s->vert_pred; |
| mb_change_index = 0; |
| mb_change_byte = mb_change_bits[mb_change_index++]; |
| mb_change_byte_mask = 0x01; |
| pixels_left = s->avctx->width; |
| |
| while (pixels_left > 0) { |
| |
| if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) { |
| |
| switch (y & 3) { |
| case 0: |
| /* if macroblock width is 2, apply C-Y-C-Y; else |
| * apply C-Y-Y */ |
| if (s->block_width == 2) { |
| APPLY_C_PREDICTOR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_C_PREDICTOR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| } else { |
| APPLY_C_PREDICTOR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| } |
| break; |
| |
| case 1: |
| case 3: |
| /* always apply 2 Y predictors on these iterations */ |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| break; |
| |
| case 2: |
| /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y |
| * depending on the macroblock type */ |
| if (s->block_type == BLOCK_2x2) { |
| APPLY_C_PREDICTOR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_C_PREDICTOR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| } else if (s->block_type == BLOCK_4x2) { |
| APPLY_C_PREDICTOR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| } else { |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_Y_PREDICTOR(); |
| OUTPUT_PIXEL_PAIR(); |
| } |
| break; |
| } |
| |
| } else { |
| |
| /* skip (copy) four pixels, but reassign the horizontal |
| * predictor */ |
| *vert_pred++ = *current_pixel_pair++; |
| horiz_pred = *current_pixel_pair - *vert_pred; |
| *vert_pred++ = *current_pixel_pair++; |
| |
| } |
| |
| if (!keyframe) { |
| mb_change_byte_mask <<= 1; |
| |
| /* next byte */ |
| if (!mb_change_byte_mask) { |
| mb_change_byte = mb_change_bits[mb_change_index++]; |
| mb_change_byte_mask = 0x01; |
| } |
| } |
| |
| pixels_left -= 4; |
| } |
| |
| /* next change row */ |
| if (((y + 1) & 3) == 0) |
| mb_change_bits += s->mb_change_bits_row_size; |
| |
| current_line += s->frame.linesize[0]; |
| } |
| } |
| |
| static void truemotion1_decode_24bit(TrueMotion1Context *s) |
| { |
| int y; |
| int pixels_left; /* remaining pixels on this line */ |
| unsigned int predictor_pair; |
| unsigned int horiz_pred; |
| unsigned int *vert_pred; |
| unsigned int *current_pixel_pair; |
| unsigned char *current_line = s->frame.data[0]; |
| int keyframe = s->flags & FLAG_KEYFRAME; |
| |
| /* these variables are for managing the stream of macroblock change bits */ |
| const unsigned char *mb_change_bits = s->mb_change_bits; |
| unsigned char mb_change_byte; |
| unsigned char mb_change_byte_mask; |
| int mb_change_index; |
| |
| /* these variables are for managing the main index stream */ |
| int index_stream_index = 0; /* yes, the index into the index stream */ |
| int index; |
| |
| /* clean out the line buffer */ |
| memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int)); |
| |
| GET_NEXT_INDEX(); |
| |
| for (y = 0; y < s->avctx->height; y++) { |
| |
| /* re-init variables for the next line iteration */ |
| horiz_pred = 0; |
| current_pixel_pair = (unsigned int *)current_line; |
| vert_pred = s->vert_pred; |
| mb_change_index = 0; |
| mb_change_byte = mb_change_bits[mb_change_index++]; |
| mb_change_byte_mask = 0x01; |
| pixels_left = s->avctx->width; |
| |
| while (pixels_left > 0) { |
| |
| if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) { |
| |
| switch (y & 3) { |
| case 0: |
| /* if macroblock width is 2, apply C-Y-C-Y; else |
| * apply C-Y-Y */ |
| if (s->block_width == 2) { |
| APPLY_C_PREDICTOR_24(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_C_PREDICTOR_24(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| } else { |
| APPLY_C_PREDICTOR_24(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| } |
| break; |
| |
| case 1: |
| case 3: |
| /* always apply 2 Y predictors on these iterations */ |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| break; |
| |
| case 2: |
| /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y |
| * depending on the macroblock type */ |
| if (s->block_type == BLOCK_2x2) { |
| APPLY_C_PREDICTOR_24(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_C_PREDICTOR_24(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| } else if (s->block_type == BLOCK_4x2) { |
| APPLY_C_PREDICTOR_24(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| } else { |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| APPLY_Y_PREDICTOR_24(); |
| OUTPUT_PIXEL_PAIR(); |
| } |
| break; |
| } |
| |
| } else { |
| |
| /* skip (copy) four pixels, but reassign the horizontal |
| * predictor */ |
| *vert_pred++ = *current_pixel_pair++; |
| horiz_pred = *current_pixel_pair - *vert_pred; |
| *vert_pred++ = *current_pixel_pair++; |
| |
| } |
| |
| if (!keyframe) { |
| mb_change_byte_mask <<= 1; |
| |
| /* next byte */ |
| if (!mb_change_byte_mask) { |
| mb_change_byte = mb_change_bits[mb_change_index++]; |
| mb_change_byte_mask = 0x01; |
| } |
| } |
| |
| pixels_left -= 4; |
| } |
| |
| /* next change row */ |
| if (((y + 1) & 3) == 0) |
| mb_change_bits += s->mb_change_bits_row_size; |
| |
| current_line += s->frame.linesize[0]; |
| } |
| } |
| |
| |
| static int truemotion1_decode_frame(AVCodecContext *avctx, |
| void *data, int *data_size, |
| const uint8_t *buf, int buf_size) |
| { |
| TrueMotion1Context *s = avctx->priv_data; |
| |
| s->buf = buf; |
| s->size = buf_size; |
| |
| if (truemotion1_decode_header(s) == -1) |
| return -1; |
| |
| s->frame.reference = 1; |
| s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | |
| FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; |
| if (avctx->reget_buffer(avctx, &s->frame) < 0) { |
| av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
| return -1; |
| } |
| |
| if (compression_types[s->compression].algorithm == ALGO_RGB24H) { |
| truemotion1_decode_24bit(s); |
| } else if (compression_types[s->compression].algorithm != ALGO_NOP) { |
| truemotion1_decode_16bit(s); |
| } |
| |
| *data_size = sizeof(AVFrame); |
| *(AVFrame*)data = s->frame; |
| |
| /* report that the buffer was completely consumed */ |
| return buf_size; |
| } |
| |
| static av_cold int truemotion1_decode_end(AVCodecContext *avctx) |
| { |
| TrueMotion1Context *s = avctx->priv_data; |
| |
| if (s->frame.data[0]) |
| avctx->release_buffer(avctx, &s->frame); |
| |
| av_free(s->vert_pred); |
| |
| return 0; |
| } |
| |
| AVCodec truemotion1_decoder = { |
| "truemotion1", |
| CODEC_TYPE_VIDEO, |
| CODEC_ID_TRUEMOTION1, |
| sizeof(TrueMotion1Context), |
| truemotion1_decode_init, |
| NULL, |
| truemotion1_decode_end, |
| truemotion1_decode_frame, |
| CODEC_CAP_DR1, |
| .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"), |
| }; |
