mirror of
https://github.com/FFmpeg/FFmpeg.git
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71c378984b
Signed-off-by: Paul B Mahol <onemda@gmail.com>
528 lines
17 KiB
C
528 lines
17 KiB
C
/*
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* Quicktime Animation (RLE) Video Decoder
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* Copyright (C) 2004 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 RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
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* For more information about the QT RLE format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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*
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* The QT RLE decoder has seven modes of operation:
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* 1, 2, 4, 8, 16, 24, and 32 bits per pixel. For modes 1, 2, 4, and 8
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* the decoder outputs PAL8 colorspace data. 16-bit data yields RGB555
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* data. 24-bit data is RGB24 and 32-bit data is RGB32.
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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 "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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typedef struct QtrleContext {
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AVCodecContext *avctx;
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AVFrame *frame;
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GetByteContext g;
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uint32_t pal[256];
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} QtrleContext;
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#define CHECK_PIXEL_PTR(n) \
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if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \
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av_log (s->avctx, AV_LOG_ERROR, "Problem: pixel_ptr = %d, pixel_limit = %d\n",\
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pixel_ptr + n, pixel_limit); \
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return; \
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} \
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static void qtrle_decode_1bpp(QtrleContext *s, int row_ptr, int lines_to_change)
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{
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int rle_code;
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int pixel_ptr;
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int row_inc = s->frame->linesize[0];
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uint8_t pi0, pi1; /* 2 8-pixel values */
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uint8_t *rgb = s->frame->data[0];
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int pixel_limit = s->frame->linesize[0] * s->avctx->height;
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int skip;
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/* skip & 0x80 appears to mean 'start a new line', which can be interpreted
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* as 'go to next line' during the decoding of a frame but is 'go to first
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* line' at the beginning. Since we always interpret it as 'go to next line'
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* in the decoding loop (which makes code simpler/faster), the first line
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* would not be counted, so we count one more.
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* See: https://trac.ffmpeg.org/ticket/226
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* In the following decoding loop, row_ptr will be the position of the
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* current row. */
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row_ptr -= row_inc;
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pixel_ptr = row_ptr;
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lines_to_change++;
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while (lines_to_change) {
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skip = bytestream2_get_byte(&s->g);
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rle_code = (int8_t)bytestream2_get_byte(&s->g);
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if (rle_code == 0)
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break;
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if(skip & 0x80) {
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lines_to_change--;
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row_ptr += row_inc;
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pixel_ptr = row_ptr + 2 * (skip & 0x7f);
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} else
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pixel_ptr += 2 * skip;
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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if(rle_code == -1)
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continue;
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if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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/* get the next 2 bytes from the stream, treat them as groups
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* of 8 pixels, and output them rle_code times */
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pi0 = bytestream2_get_byte(&s->g);
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pi1 = bytestream2_get_byte(&s->g);
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CHECK_PIXEL_PTR(rle_code * 2);
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while (rle_code--) {
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rgb[pixel_ptr++] = pi0;
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rgb[pixel_ptr++] = pi1;
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}
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} else {
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/* copy the same pixel directly to output 2 times */
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rle_code *= 2;
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CHECK_PIXEL_PTR(rle_code);
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bytestream2_get_buffer(&s->g, &rgb[pixel_ptr], rle_code);
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pixel_ptr += rle_code;
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}
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}
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}
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static inline void qtrle_decode_2n4bpp(QtrleContext *s, int row_ptr,
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int lines_to_change, int bpp)
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{
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int rle_code, i;
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int pixel_ptr;
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int row_inc = s->frame->linesize[0];
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uint8_t pi[16]; /* 16 palette indices */
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uint8_t *rgb = s->frame->data[0];
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int pixel_limit = s->frame->linesize[0] * s->avctx->height;
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int num_pixels = (bpp == 4) ? 8 : 16;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (num_pixels * (bytestream2_get_byte(&s->g) - 1));
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CHECK_PIXEL_PTR(0);
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while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
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if (rle_code == 0) {
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/* there's another skip code in the stream */
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pixel_ptr += (num_pixels * (bytestream2_get_byte(&s->g) - 1));
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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/* get the next 4 bytes from the stream, treat them as palette
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* indexes, and output them rle_code times */
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for (i = num_pixels-1; i >= 0; i--) {
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pi[num_pixels-1-i] = (bytestream2_peek_byte(&s->g) >> ((i*bpp) & 0x07)) & ((1<<bpp)-1);
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bytestream2_skip(&s->g, ((i & ((num_pixels>>2)-1)) == 0));
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}
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CHECK_PIXEL_PTR(rle_code * num_pixels);
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while (rle_code--) {
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memcpy(&rgb[pixel_ptr], &pi, num_pixels);
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pixel_ptr += num_pixels;
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}
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} else {
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/* copy the same pixel directly to output 4 times */
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rle_code *= 4;
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CHECK_PIXEL_PTR(rle_code*(num_pixels>>2));
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while (rle_code--) {
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if(bpp == 4) {
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int x = bytestream2_get_byte(&s->g);
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rgb[pixel_ptr++] = (x >> 4) & 0x0f;
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rgb[pixel_ptr++] = x & 0x0f;
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} else {
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int x = bytestream2_get_byte(&s->g);
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rgb[pixel_ptr++] = (x >> 6) & 0x03;
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rgb[pixel_ptr++] = (x >> 4) & 0x03;
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rgb[pixel_ptr++] = (x >> 2) & 0x03;
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rgb[pixel_ptr++] = x & 0x03;
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}
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}
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}
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}
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row_ptr += row_inc;
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}
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}
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static void qtrle_decode_8bpp(QtrleContext *s, int row_ptr, int lines_to_change)
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{
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int rle_code;
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int pixel_ptr;
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int row_inc = s->frame->linesize[0];
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uint8_t pi1, pi2, pi3, pi4; /* 4 palette indexes */
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uint8_t *rgb = s->frame->data[0];
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int pixel_limit = s->frame->linesize[0] * s->avctx->height;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (4 * (bytestream2_get_byte(&s->g) - 1));
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CHECK_PIXEL_PTR(0);
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while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
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if (rle_code == 0) {
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/* there's another skip code in the stream */
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pixel_ptr += (4 * (bytestream2_get_byte(&s->g) - 1));
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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/* get the next 4 bytes from the stream, treat them as palette
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* indexes, and output them rle_code times */
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pi1 = bytestream2_get_byte(&s->g);
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pi2 = bytestream2_get_byte(&s->g);
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pi3 = bytestream2_get_byte(&s->g);
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pi4 = bytestream2_get_byte(&s->g);
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CHECK_PIXEL_PTR(rle_code * 4);
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while (rle_code--) {
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rgb[pixel_ptr++] = pi1;
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rgb[pixel_ptr++] = pi2;
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rgb[pixel_ptr++] = pi3;
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rgb[pixel_ptr++] = pi4;
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}
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} else {
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/* copy the same pixel directly to output 4 times */
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rle_code *= 4;
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CHECK_PIXEL_PTR(rle_code);
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bytestream2_get_buffer(&s->g, &rgb[pixel_ptr], rle_code);
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pixel_ptr += rle_code;
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}
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}
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row_ptr += row_inc;
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}
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}
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static void qtrle_decode_16bpp(QtrleContext *s, int row_ptr, int lines_to_change)
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{
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int rle_code;
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int pixel_ptr;
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int row_inc = s->frame->linesize[0];
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uint16_t rgb16;
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uint8_t *rgb = s->frame->data[0];
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int pixel_limit = s->frame->linesize[0] * s->avctx->height;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 2;
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CHECK_PIXEL_PTR(0);
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while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
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if (rle_code == 0) {
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/* there's another skip code in the stream */
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pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 2;
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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rgb16 = bytestream2_get_be16(&s->g);
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CHECK_PIXEL_PTR(rle_code * 2);
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while (rle_code--) {
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*(uint16_t *)(&rgb[pixel_ptr]) = rgb16;
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pixel_ptr += 2;
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}
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} else {
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CHECK_PIXEL_PTR(rle_code * 2);
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/* copy pixels directly to output */
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while (rle_code--) {
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rgb16 = bytestream2_get_be16(&s->g);
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*(uint16_t *)(&rgb[pixel_ptr]) = rgb16;
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pixel_ptr += 2;
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}
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}
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}
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row_ptr += row_inc;
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}
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}
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static void qtrle_decode_24bpp(QtrleContext *s, int row_ptr, int lines_to_change)
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{
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int rle_code;
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int pixel_ptr;
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int row_inc = s->frame->linesize[0];
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uint8_t r, g, b;
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uint8_t *rgb = s->frame->data[0];
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int pixel_limit = s->frame->linesize[0] * s->avctx->height;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 3;
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CHECK_PIXEL_PTR(0);
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while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
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if (rle_code == 0) {
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/* there's another skip code in the stream */
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pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 3;
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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r = bytestream2_get_byte(&s->g);
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g = bytestream2_get_byte(&s->g);
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b = bytestream2_get_byte(&s->g);
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CHECK_PIXEL_PTR(rle_code * 3);
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while (rle_code--) {
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rgb[pixel_ptr++] = r;
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rgb[pixel_ptr++] = g;
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rgb[pixel_ptr++] = b;
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}
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} else {
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CHECK_PIXEL_PTR(rle_code * 3);
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/* copy pixels directly to output */
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while (rle_code--) {
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rgb[pixel_ptr++] = bytestream2_get_byte(&s->g);
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rgb[pixel_ptr++] = bytestream2_get_byte(&s->g);
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rgb[pixel_ptr++] = bytestream2_get_byte(&s->g);
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}
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}
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}
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row_ptr += row_inc;
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}
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}
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static void qtrle_decode_32bpp(QtrleContext *s, int row_ptr, int lines_to_change)
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{
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int rle_code;
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int pixel_ptr;
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int row_inc = s->frame->linesize[0];
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unsigned int argb;
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uint8_t *rgb = s->frame->data[0];
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int pixel_limit = s->frame->linesize[0] * s->avctx->height;
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while (lines_to_change--) {
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pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 4;
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CHECK_PIXEL_PTR(0);
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while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
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if (rle_code == 0) {
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/* there's another skip code in the stream */
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pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 4;
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CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
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} else if (rle_code < 0) {
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/* decode the run length code */
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rle_code = -rle_code;
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argb = bytestream2_get_be32(&s->g);
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CHECK_PIXEL_PTR(rle_code * 4);
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while (rle_code--) {
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AV_WN32A(rgb + pixel_ptr, argb);
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pixel_ptr += 4;
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}
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} else {
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CHECK_PIXEL_PTR(rle_code * 4);
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/* copy pixels directly to output */
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while (rle_code--) {
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argb = bytestream2_get_be32(&s->g);
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AV_WN32A(rgb + pixel_ptr, argb);
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pixel_ptr += 4;
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}
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}
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}
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row_ptr += row_inc;
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}
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}
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static av_cold int qtrle_decode_init(AVCodecContext *avctx)
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{
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QtrleContext *s = avctx->priv_data;
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s->avctx = avctx;
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switch (avctx->bits_per_coded_sample) {
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case 1:
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case 33:
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avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
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break;
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case 2:
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case 4:
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case 8:
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case 34:
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case 36:
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case 40:
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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break;
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case 16:
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avctx->pix_fmt = AV_PIX_FMT_RGB555;
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break;
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case 24:
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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break;
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case 32:
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avctx->pix_fmt = AV_PIX_FMT_RGB32;
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break;
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default:
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av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
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avctx->bits_per_coded_sample);
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return AVERROR_INVALIDDATA;
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}
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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 qtrle_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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QtrleContext *s = avctx->priv_data;
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int header, start_line;
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int height, row_ptr;
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int has_palette = 0;
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int ret;
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bytestream2_init(&s->g, avpkt->data, avpkt->size);
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if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
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return ret;
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/* check if this frame is even supposed to change */
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if (avpkt->size < 8)
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goto done;
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/* start after the chunk size */
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bytestream2_seek(&s->g, 4, SEEK_SET);
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/* fetch the header */
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header = bytestream2_get_be16(&s->g);
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/* if a header is present, fetch additional decoding parameters */
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if (header & 0x0008) {
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if (avpkt->size < 14)
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goto done;
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start_line = bytestream2_get_be16(&s->g);
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bytestream2_skip(&s->g, 2);
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height = bytestream2_get_be16(&s->g);
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bytestream2_skip(&s->g, 2);
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if (height > s->avctx->height - start_line)
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goto done;
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} else {
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start_line = 0;
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height = s->avctx->height;
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}
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row_ptr = s->frame->linesize[0] * start_line;
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switch (avctx->bits_per_coded_sample) {
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case 1:
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case 33:
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qtrle_decode_1bpp(s, row_ptr, height);
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break;
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case 2:
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case 34:
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qtrle_decode_2n4bpp(s, row_ptr, height, 2);
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has_palette = 1;
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break;
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case 4:
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case 36:
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qtrle_decode_2n4bpp(s, row_ptr, height, 4);
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has_palette = 1;
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break;
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case 8:
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case 40:
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qtrle_decode_8bpp(s, row_ptr, height);
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has_palette = 1;
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break;
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case 16:
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qtrle_decode_16bpp(s, row_ptr, height);
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break;
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case 24:
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qtrle_decode_24bpp(s, row_ptr, height);
|
|
break;
|
|
|
|
case 32:
|
|
qtrle_decode_32bpp(s, row_ptr, height);
|
|
break;
|
|
|
|
default:
|
|
av_log (s->avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
|
|
avctx->bits_per_coded_sample);
|
|
break;
|
|
}
|
|
|
|
if(has_palette) {
|
|
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
|
|
|
|
if (pal) {
|
|
s->frame->palette_has_changed = 1;
|
|
memcpy(s->pal, pal, AVPALETTE_SIZE);
|
|
}
|
|
|
|
/* make the palette available on the way out */
|
|
memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
|
|
}
|
|
|
|
done:
|
|
if ((ret = av_frame_ref(data, s->frame)) < 0)
|
|
return ret;
|
|
*got_frame = 1;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int qtrle_decode_end(AVCodecContext *avctx)
|
|
{
|
|
QtrleContext *s = avctx->priv_data;
|
|
|
|
av_frame_free(&s->frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_qtrle_decoder = {
|
|
.name = "qtrle",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_QTRLE,
|
|
.priv_data_size = sizeof(QtrleContext),
|
|
.init = qtrle_decode_init,
|
|
.close = qtrle_decode_end,
|
|
.decode = qtrle_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"),
|
|
};
|