diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/truemotion1.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/truemotion1.c | 928 |
1 files changed, 928 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/truemotion1.c b/contrib/ffmpeg/libavcodec/truemotion1.c new file mode 100644 index 000000000..a7d3544f4 --- /dev/null +++ b/contrib/ffmpeg/libavcodec/truemotion1.c @@ -0,0 +1,928 @@ +/* + * 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 truemotion1.c + * Duck TrueMotion v1 Video Decoder by + * Alex Beregszaszi (alex@fsn.hu) 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 "common.h" +#include "avcodec.h" +#include "dsputil.h" + +#include "truemotion1data.h" + +typedef struct TrueMotion1Context { + AVCodecContext *avctx; + AVFrame frame; + AVFrame prev_frame; + + uint8_t *buf; + int size; + + uint8_t *mb_change_bits; + int mb_change_bits_row_size; + 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 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 int truemotion1_decode_init(AVCodecContext *avctx) +{ + TrueMotion1Context *s = (TrueMotion1Context *)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; + + avctx->has_b_frames = 0; + s->frame.data[0] = s->prev_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++; \ + prev_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 int *prev_pixel_pair; + unsigned char *current_line = s->frame.data[0]; + unsigned char *prev_line = s->prev_frame.data[0]; + int keyframe = s->flags & FLAG_KEYFRAME; + + /* these variables are for managing the stream of macroblock change bits */ + 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; + prev_pixel_pair = (unsigned int *)prev_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 */ + *current_pixel_pair = *prev_pixel_pair++; + *vert_pred++ = *current_pixel_pair++; + *current_pixel_pair = *prev_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]; + prev_line += s->prev_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 int *prev_pixel_pair; + unsigned char *current_line = s->frame.data[0]; + unsigned char *prev_line = s->prev_frame.data[0]; + int keyframe = s->flags & FLAG_KEYFRAME; + + /* these variables are for managing the stream of macroblock change bits */ + 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; + prev_pixel_pair = (unsigned int *)prev_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 */ + *current_pixel_pair = *prev_pixel_pair++; + *vert_pred++ = *current_pixel_pair++; + *current_pixel_pair = *prev_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]; + prev_line += s->prev_frame.linesize[0]; + } +} + + +static int truemotion1_decode_frame(AVCodecContext *avctx, + void *data, int *data_size, + uint8_t *buf, int buf_size) +{ + TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data; + + s->buf = buf; + s->size = buf_size; + + if (truemotion1_decode_header(s) == -1) + return -1; + + s->frame.reference = 1; + if (avctx->get_buffer(avctx, &s->frame) < 0) { + av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return -1; + } + + /* check for a do-nothing frame and copy the previous frame */ + if (compression_types[s->compression].algorithm == ALGO_NOP) + { + memcpy(s->frame.data[0], s->prev_frame.data[0], + s->frame.linesize[0] * s->avctx->height); + } else if (compression_types[s->compression].algorithm == ALGO_RGB24H) { + truemotion1_decode_24bit(s); + } else { + truemotion1_decode_16bit(s); + } + + if (s->prev_frame.data[0]) + avctx->release_buffer(avctx, &s->prev_frame); + + /* shuffle frames */ + s->prev_frame = s->frame; + + *data_size = sizeof(AVFrame); + *(AVFrame*)data = s->frame; + + /* report that the buffer was completely consumed */ + return buf_size; +} + +static int truemotion1_decode_end(AVCodecContext *avctx) +{ + TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data; + + /* release the last frame */ + if (s->prev_frame.data[0]) + avctx->release_buffer(avctx, &s->prev_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, +}; |