290 lines
8.6 KiB
C
290 lines
8.6 KiB
C
/*
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* Quicktime Video (RPZA) Video Decoder
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* Copyright (C) 2003 the ffmpeg project
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavcodec/rpza.c
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* QT RPZA Video Decoder by Roberto Togni
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* For more information about the RPZA format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*
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* The RPZA decoder outputs RGB555 colorspace data.
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*
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* Note that this decoder reads big endian RGB555 pixel values from the
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* bytestream, arranges them in the host's endian order, and outputs
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* them to the final rendered map in the same host endian order. This is
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* intended behavior as the ffmpeg documentation states that RGB555 pixels
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* shall be stored in native CPU endianness.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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typedef struct RpzaContext {
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AVCodecContext *avctx;
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AVFrame frame;
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const unsigned char *buf;
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int size;
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} RpzaContext;
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#define ADVANCE_BLOCK() \
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{ \
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pixel_ptr += 4; \
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if (pixel_ptr >= width) \
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{ \
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pixel_ptr = 0; \
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row_ptr += stride * 4; \
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} \
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total_blocks--; \
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if (total_blocks < 0) \
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{ \
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av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
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return; \
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} \
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}
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static void rpza_decode_stream(RpzaContext *s)
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{
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int width = s->avctx->width;
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int stride = s->frame.linesize[0] / 2;
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int row_inc = stride - 4;
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int stream_ptr = 0;
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int chunk_size;
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unsigned char opcode;
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int n_blocks;
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unsigned short colorA = 0, colorB;
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unsigned short color4[4];
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unsigned char index, idx;
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unsigned short ta, tb;
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unsigned short *pixels = (unsigned short *)s->frame.data[0];
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int row_ptr = 0;
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int pixel_ptr = 0;
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int block_ptr;
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int pixel_x, pixel_y;
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int total_blocks;
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/* First byte is always 0xe1. Warn if it's different */
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if (s->buf[stream_ptr] != 0xe1)
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av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
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s->buf[stream_ptr]);
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/* Get chunk size, ingnoring first byte */
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chunk_size = AV_RB32(&s->buf[stream_ptr]) & 0x00FFFFFF;
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stream_ptr += 4;
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/* If length mismatch use size from MOV file and try to decode anyway */
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if (chunk_size != s->size)
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av_log(s->avctx, AV_LOG_ERROR, "MOV chunk size != encoded chunk size; using MOV chunk size\n");
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chunk_size = s->size;
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/* Number of 4x4 blocks in frame. */
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total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
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/* Process chunk data */
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while (stream_ptr < chunk_size) {
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opcode = s->buf[stream_ptr++]; /* Get opcode */
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n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
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/* If opcode MSbit is 0, we need more data to decide what to do */
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if ((opcode & 0x80) == 0) {
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colorA = (opcode << 8) | (s->buf[stream_ptr++]);
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opcode = 0;
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if ((s->buf[stream_ptr] & 0x80) != 0) {
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/* Must behave as opcode 110xxxxx, using colorA computed
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* above. Use fake opcode 0x20 to enter switch block at
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* the right place */
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opcode = 0x20;
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n_blocks = 1;
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}
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}
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switch (opcode & 0xe0) {
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/* Skip blocks */
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case 0x80:
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while (n_blocks--) {
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ADVANCE_BLOCK();
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}
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break;
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/* Fill blocks with one color */
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case 0xa0:
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colorA = AV_RB16 (&s->buf[stream_ptr]);
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stream_ptr += 2;
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while (n_blocks--) {
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block_ptr = row_ptr + pixel_ptr;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++){
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pixels[block_ptr] = colorA;
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block_ptr++;
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}
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block_ptr += row_inc;
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}
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ADVANCE_BLOCK();
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}
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break;
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/* Fill blocks with 4 colors */
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case 0xc0:
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colorA = AV_RB16 (&s->buf[stream_ptr]);
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stream_ptr += 2;
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case 0x20:
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colorB = AV_RB16 (&s->buf[stream_ptr]);
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stream_ptr += 2;
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/* sort out the colors */
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color4[0] = colorB;
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color4[1] = 0;
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color4[2] = 0;
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color4[3] = colorA;
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/* red components */
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ta = (colorA >> 10) & 0x1F;
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tb = (colorB >> 10) & 0x1F;
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color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
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color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
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/* green components */
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ta = (colorA >> 5) & 0x1F;
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tb = (colorB >> 5) & 0x1F;
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color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
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color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
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/* blue components */
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ta = colorA & 0x1F;
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tb = colorB & 0x1F;
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color4[1] |= ((11 * ta + 21 * tb) >> 5);
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color4[2] |= ((21 * ta + 11 * tb) >> 5);
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while (n_blocks--) {
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block_ptr = row_ptr + pixel_ptr;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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index = s->buf[stream_ptr++];
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for (pixel_x = 0; pixel_x < 4; pixel_x++){
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idx = (index >> (2 * (3 - pixel_x))) & 0x03;
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pixels[block_ptr] = color4[idx];
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block_ptr++;
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}
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block_ptr += row_inc;
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}
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ADVANCE_BLOCK();
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}
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break;
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/* Fill block with 16 colors */
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case 0x00:
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block_ptr = row_ptr + pixel_ptr;
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for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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for (pixel_x = 0; pixel_x < 4; pixel_x++){
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/* We already have color of upper left pixel */
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if ((pixel_y != 0) || (pixel_x !=0)) {
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colorA = AV_RB16 (&s->buf[stream_ptr]);
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stream_ptr += 2;
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}
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pixels[block_ptr] = colorA;
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block_ptr++;
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}
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block_ptr += row_inc;
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}
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ADVANCE_BLOCK();
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break;
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/* Unknown opcode */
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default:
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av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
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" Skip remaining %d bytes of chunk data.\n", opcode,
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chunk_size - stream_ptr);
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return;
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} /* Opcode switch */
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}
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}
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static av_cold int rpza_decode_init(AVCodecContext *avctx)
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{
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RpzaContext *s = avctx->priv_data;
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s->avctx = avctx;
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avctx->pix_fmt = PIX_FMT_RGB555;
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s->frame.data[0] = NULL;
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return 0;
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}
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static int rpza_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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RpzaContext *s = avctx->priv_data;
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s->buf = buf;
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s->size = buf_size;
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s->frame.reference = 1;
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, &s->frame)) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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return -1;
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}
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rpza_decode_stream(s);
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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/* always report that the buffer was completely consumed */
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return buf_size;
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}
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static av_cold int rpza_decode_end(AVCodecContext *avctx)
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{
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RpzaContext *s = avctx->priv_data;
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if (s->frame.data[0])
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avctx->release_buffer(avctx, &s->frame);
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return 0;
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}
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AVCodec rpza_decoder = {
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"rpza",
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CODEC_TYPE_VIDEO,
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CODEC_ID_RPZA,
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sizeof(RpzaContext),
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rpza_decode_init,
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NULL,
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rpza_decode_end,
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rpza_decode_frame,
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CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
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};
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