300 lines
9.5 KiB
C
300 lines
9.5 KiB
C
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/*
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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
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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 libavcodec documentation states that RGB555
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* pixels shall be stored in native CPU endianness.
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*/
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#include <stdint.h>
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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/internal.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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typedef struct RpzaContext {
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AVCodecContext *avctx;
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AVFrame *frame;
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GetByteContext gb;
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} RpzaContext;
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#define CHECK_BLOCK() \
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if (total_blocks < 1) { \
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av_log(s->avctx, AV_LOG_ERROR, \
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"Block counter just went negative (this should not happen)\n"); \
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return AVERROR_INVALIDDATA; \
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} \
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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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}
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static int rpza_decode_stream(RpzaContext *s)
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{
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int width = s->avctx->width;
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int stride, row_inc, ret;
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int chunk_size;
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uint16_t colorA = 0, colorB;
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uint16_t color4[4];
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uint16_t ta, tb;
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uint16_t *pixels;
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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 (bytestream2_peek_byte(&s->gb) != 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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bytestream2_peek_byte(&s->gb));
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/* Get chunk size, ignoring first byte */
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chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
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/* If length mismatch use size from MOV file and try to decode anyway */
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if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
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av_log(s->avctx, AV_LOG_WARNING,
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"MOV chunk size %d != encoded chunk size %d\n",
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chunk_size,
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bytestream2_get_bytes_left(&s->gb) + 4
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);
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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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if (total_blocks / 32 > bytestream2_get_bytes_left(&s->gb))
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return AVERROR_INVALIDDATA;
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if ((ret = ff_reget_buffer(s->avctx, s->frame, 0)) < 0)
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return ret;
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pixels = (uint16_t *)s->frame->data[0];
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stride = s->frame->linesize[0] / 2;
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row_inc = stride - 4;
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/* Process chunk data */
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while (bytestream2_get_bytes_left(&s->gb)) {
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uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
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int 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) | bytestream2_get_byte(&s->gb);
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opcode = 0;
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if ((bytestream2_peek_byte(&s->gb) & 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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n_blocks = FFMIN(n_blocks, total_blocks);
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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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CHECK_BLOCK();
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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 = bytestream2_get_be16(&s->gb);
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while (n_blocks--) {
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CHECK_BLOCK();
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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 = bytestream2_get_be16(&s->gb);
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case 0x20:
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colorB = bytestream2_get_be16(&s->gb);
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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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if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
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return AVERROR_INVALIDDATA;
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while (n_blocks--) {
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CHECK_BLOCK();
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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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uint8_t index = bytestream2_get_byteu(&s->gb);
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for (pixel_x = 0; pixel_x < 4; pixel_x++){
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uint8_t 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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if (bytestream2_get_bytes_left(&s->gb) < 30)
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return AVERROR_INVALIDDATA;
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CHECK_BLOCK();
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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 = bytestream2_get_be16u(&s->gb);
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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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bytestream2_get_bytes_left(&s->gb));
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return AVERROR_INVALIDDATA;
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} /* Opcode switch */
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}
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return 0;
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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 = AV_PIX_FMT_RGB555;
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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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 *got_frame,
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AVPacket *avpkt)
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{
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RpzaContext *s = avctx->priv_data;
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int ret;
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bytestream2_init(&s->gb, avpkt->data, avpkt->size);
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ret = rpza_decode_stream(s);
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if (ret < 0)
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return ret;
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if ((ret = av_frame_ref(data, s->frame)) < 0)
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return ret;
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*got_frame = 1;
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/* always report that the buffer was completely consumed */
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return avpkt->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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av_frame_free(&s->frame);
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return 0;
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}
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AVCodec ff_rpza_decoder = {
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.name = "rpza",
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.long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_RPZA,
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.priv_data_size = sizeof(RpzaContext),
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.init = rpza_decode_init,
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.close = rpza_decode_end,
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.decode = rpza_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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