/* * Quicktime Animation (RLE) Video Decoder * Copyright (C) 2004 the ffmpeg project * * 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 qtrle.c * QT RLE Video Decoder by Mike Melanson (melanson@pcisys.net) * For more information about the QT RLE format, visit: * http://www.pcisys.net/~melanson/codecs/ * * The QT RLE decoder has seven modes of operation: * 1, 2, 4, 8, 16, 24, and 32 bits per pixel. For modes 1, 2, 4, and 8 * the decoder outputs PAL8 colorspace data. 16-bit data yields RGB555 * data. 24-bit data is RGB24 and 32-bit data is RGB32. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include "avcodec.h" typedef struct QtrleContext { AVCodecContext *avctx; AVFrame frame; const unsigned char *buf; int size; } QtrleContext; #define CHECK_STREAM_PTR(n) \ if ((stream_ptr + n) > s->size) { \ av_log (s->avctx, AV_LOG_INFO, "Problem: stream_ptr out of bounds (%d >= %d)\n", \ stream_ptr + n, s->size); \ return; \ } #define CHECK_PIXEL_PTR(n) \ if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \ av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr = %d, pixel_limit = %d\n", \ pixel_ptr + n, pixel_limit); \ return; \ } \ static void qtrle_decode_1bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr = 0; int row_inc = s->frame.linesize[0]; unsigned char pi0, pi1; /* 2 8-pixel values */ unsigned char *rgb = s->frame.data[0]; int pixel_limit = s->frame.linesize[0] * s->avctx->height; int skip; while (lines_to_change) { CHECK_STREAM_PTR(2); skip = s->buf[stream_ptr++]; rle_code = (signed char)s->buf[stream_ptr++]; if (rle_code == 0) break; if(skip & 0x80) { lines_to_change--; row_ptr += row_inc; pixel_ptr = row_ptr + 2 * (skip & 0x7f); } else pixel_ptr += 2 * skip; CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ if (rle_code < 0) { /* decode the run length code */ rle_code = -rle_code; /* get the next 2 bytes from the stream, treat them as groups * of 8 pixels, and output them rle_code times */ CHECK_STREAM_PTR(2); pi0 = s->buf[stream_ptr++]; pi1 = s->buf[stream_ptr++]; CHECK_PIXEL_PTR(rle_code * 2); while (rle_code--) { rgb[pixel_ptr++] = pi0; rgb[pixel_ptr++] = pi1; } } else { /* copy the same pixel directly to output 2 times */ rle_code *= 2; CHECK_STREAM_PTR(rle_code); CHECK_PIXEL_PTR(rle_code); while (rle_code--) rgb[pixel_ptr++] = s->buf[stream_ptr++]; } } } static inline void qtrle_decode_2n4bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change, int bpp) { int rle_code, i; int pixel_ptr; int row_inc = s->frame.linesize[0]; unsigned char pi[16]; /* 16 palette indices */ unsigned char *rgb = s->frame.data[0]; int pixel_limit = s->frame.linesize[0] * s->avctx->height; int num_pixels = (bpp == 4) ? 8 : 16; while (lines_to_change--) { CHECK_STREAM_PTR(2); pixel_ptr = row_ptr + (num_pixels * (s->buf[stream_ptr++] - 1)); while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ CHECK_STREAM_PTR(1); pixel_ptr += (num_pixels * (s->buf[stream_ptr++] - 1)); CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ } else if (rle_code < 0) { /* decode the run length code */ rle_code = -rle_code; /* get the next 4 bytes from the stream, treat them as palette * indexes, and output them rle_code times */ CHECK_STREAM_PTR(4); for (i = num_pixels-1; i >= 0; i--) { pi[num_pixels-1-i] = (s->buf[stream_ptr] >> ((i*bpp) & 0x07)) & ((1<<bpp)-1); stream_ptr+= ((i & ((num_pixels>>2)-1)) == 0); } CHECK_PIXEL_PTR(rle_code * num_pixels); while (rle_code--) { for (i = 0; i < num_pixels; i++) rgb[pixel_ptr++] = pi[i]; } } else { /* copy the same pixel directly to output 4 times */ rle_code *= 4; CHECK_STREAM_PTR(rle_code); CHECK_PIXEL_PTR(rle_code*(num_pixels>>2)); while (rle_code--) { if(bpp == 4) { rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x0f; rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x0f; } else { rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 6) & 0x03; rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 4) & 0x03; rgb[pixel_ptr++] = ((s->buf[stream_ptr]) >> 2) & 0x03; rgb[pixel_ptr++] = (s->buf[stream_ptr++]) & 0x03; } } } } row_ptr += row_inc; } } static void qtrle_decode_8bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr; int row_inc = s->frame.linesize[0]; unsigned char pi1, pi2, pi3, pi4; /* 4 palette indexes */ unsigned char *rgb = s->frame.data[0]; int pixel_limit = s->frame.linesize[0] * s->avctx->height; while (lines_to_change--) { CHECK_STREAM_PTR(2); pixel_ptr = row_ptr + (4 * (s->buf[stream_ptr++] - 1)); while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ CHECK_STREAM_PTR(1); pixel_ptr += (4 * (s->buf[stream_ptr++] - 1)); CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ } else if (rle_code < 0) { /* decode the run length code */ rle_code = -rle_code; /* get the next 4 bytes from the stream, treat them as palette * indexes, and output them rle_code times */ CHECK_STREAM_PTR(4); pi1 = s->buf[stream_ptr++]; pi2 = s->buf[stream_ptr++]; pi3 = s->buf[stream_ptr++]; pi4 = s->buf[stream_ptr++]; CHECK_PIXEL_PTR(rle_code * 4); while (rle_code--) { rgb[pixel_ptr++] = pi1; rgb[pixel_ptr++] = pi2; rgb[pixel_ptr++] = pi3; rgb[pixel_ptr++] = pi4; } } else { /* copy the same pixel directly to output 4 times */ rle_code *= 4; CHECK_STREAM_PTR(rle_code); CHECK_PIXEL_PTR(rle_code); while (rle_code--) { rgb[pixel_ptr++] = s->buf[stream_ptr++]; } } } row_ptr += row_inc; } } static void qtrle_decode_16bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr; int row_inc = s->frame.linesize[0]; unsigned short rgb16; unsigned char *rgb = s->frame.data[0]; int pixel_limit = s->frame.linesize[0] * s->avctx->height; while (lines_to_change--) { CHECK_STREAM_PTR(2); pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 2; while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ CHECK_STREAM_PTR(1); pixel_ptr += (s->buf[stream_ptr++] - 1) * 2; CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ } else if (rle_code < 0) { /* decode the run length code */ rle_code = -rle_code; CHECK_STREAM_PTR(2); rgb16 = AV_RB16(&s->buf[stream_ptr]); stream_ptr += 2; CHECK_PIXEL_PTR(rle_code * 2); while (rle_code--) { *(unsigned short *)(&rgb[pixel_ptr]) = rgb16; pixel_ptr += 2; } } else { CHECK_STREAM_PTR(rle_code * 2); CHECK_PIXEL_PTR(rle_code * 2); /* copy pixels directly to output */ while (rle_code--) { rgb16 = AV_RB16(&s->buf[stream_ptr]); stream_ptr += 2; *(unsigned short *)(&rgb[pixel_ptr]) = rgb16; pixel_ptr += 2; } } } row_ptr += row_inc; } } static void qtrle_decode_24bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr; int row_inc = s->frame.linesize[0]; unsigned char r, g, b; unsigned char *rgb = s->frame.data[0]; int pixel_limit = s->frame.linesize[0] * s->avctx->height; while (lines_to_change--) { CHECK_STREAM_PTR(2); pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 3; while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ CHECK_STREAM_PTR(1); pixel_ptr += (s->buf[stream_ptr++] - 1) * 3; CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ } else if (rle_code < 0) { /* decode the run length code */ rle_code = -rle_code; CHECK_STREAM_PTR(3); r = s->buf[stream_ptr++]; g = s->buf[stream_ptr++]; b = s->buf[stream_ptr++]; CHECK_PIXEL_PTR(rle_code * 3); while (rle_code--) { rgb[pixel_ptr++] = r; rgb[pixel_ptr++] = g; rgb[pixel_ptr++] = b; } } else { CHECK_STREAM_PTR(rle_code * 3); CHECK_PIXEL_PTR(rle_code * 3); /* copy pixels directly to output */ while (rle_code--) { rgb[pixel_ptr++] = s->buf[stream_ptr++]; rgb[pixel_ptr++] = s->buf[stream_ptr++]; rgb[pixel_ptr++] = s->buf[stream_ptr++]; } } } row_ptr += row_inc; } } static void qtrle_decode_32bpp(QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr; int row_inc = s->frame.linesize[0]; unsigned char a, r, g, b; unsigned int argb; unsigned char *rgb = s->frame.data[0]; int pixel_limit = s->frame.linesize[0] * s->avctx->height; while (lines_to_change--) { CHECK_STREAM_PTR(2); pixel_ptr = row_ptr + (s->buf[stream_ptr++] - 1) * 4; while ((rle_code = (signed char)s->buf[stream_ptr++]) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ CHECK_STREAM_PTR(1); pixel_ptr += (s->buf[stream_ptr++] - 1) * 4; CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */ } else if (rle_code < 0) { /* decode the run length code */ rle_code = -rle_code; CHECK_STREAM_PTR(4); a = s->buf[stream_ptr++]; r = s->buf[stream_ptr++]; g = s->buf[stream_ptr++]; b = s->buf[stream_ptr++]; argb = (a << 24) | (r << 16) | (g << 8) | (b << 0); CHECK_PIXEL_PTR(rle_code * 4); while (rle_code--) { *(unsigned int *)(&rgb[pixel_ptr]) = argb; pixel_ptr += 4; } } else { CHECK_STREAM_PTR(rle_code * 4); CHECK_PIXEL_PTR(rle_code * 4); /* copy pixels directly to output */ while (rle_code--) { a = s->buf[stream_ptr++]; r = s->buf[stream_ptr++]; g = s->buf[stream_ptr++]; b = s->buf[stream_ptr++]; argb = (a << 24) | (r << 16) | (g << 8) | (b << 0); *(unsigned int *)(&rgb[pixel_ptr]) = argb; pixel_ptr += 4; } } } row_ptr += row_inc; } } static av_cold int qtrle_decode_init(AVCodecContext *avctx) { QtrleContext *s = avctx->priv_data; s->avctx = avctx; switch (avctx->bits_per_coded_sample) { case 1: case 33: avctx->pix_fmt = PIX_FMT_MONOWHITE; break; case 2: case 4: case 8: case 34: case 36: case 40: avctx->pix_fmt = PIX_FMT_PAL8; break; case 16: avctx->pix_fmt = PIX_FMT_RGB555; break; case 24: avctx->pix_fmt = PIX_FMT_RGB24; break; case 32: avctx->pix_fmt = PIX_FMT_RGB32; break; default: av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n", avctx->bits_per_coded_sample); break; } s->frame.data[0] = NULL; return 0; } static int qtrle_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size) { QtrleContext *s = avctx->priv_data; int header, start_line; int stream_ptr, height, row_ptr; int has_palette = 0; s->buf = buf; s->size = buf_size; s->frame.reference = 1; s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE | FF_BUFFER_HINTS_READABLE; if (avctx->reget_buffer(avctx, &s->frame)) { av_log (s->avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); return -1; } /* check if this frame is even supposed to change */ if (s->size < 8) goto done; /* start after the chunk size */ stream_ptr = 4; /* fetch the header */ header = AV_RB16(&s->buf[stream_ptr]); stream_ptr += 2; /* if a header is present, fetch additional decoding parameters */ if (header & 0x0008) { if(s->size < 14) goto done; start_line = AV_RB16(&s->buf[stream_ptr]); stream_ptr += 4; height = AV_RB16(&s->buf[stream_ptr]); stream_ptr += 4; } else { start_line = 0; height = s->avctx->height; } row_ptr = s->frame.linesize[0] * start_line; switch (avctx->bits_per_coded_sample) { case 1: case 33: qtrle_decode_1bpp(s, stream_ptr, row_ptr, height); break; case 2: case 34: qtrle_decode_2n4bpp(s, stream_ptr, row_ptr, height, 2); has_palette = 1; break; case 4: case 36: qtrle_decode_2n4bpp(s, stream_ptr, row_ptr, height, 4); has_palette = 1; break; case 8: case 40: qtrle_decode_8bpp(s, stream_ptr, row_ptr, height); has_palette = 1; break; case 16: qtrle_decode_16bpp(s, stream_ptr, row_ptr, height); break; case 24: qtrle_decode_24bpp(s, stream_ptr, row_ptr, height); break; case 32: qtrle_decode_32bpp(s, stream_ptr, 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) { /* make the palette available on the way out */ memcpy(s->frame.data[1], s->avctx->palctrl->palette, AVPALETTE_SIZE); if (s->avctx->palctrl->palette_changed) { s->frame.palette_has_changed = 1; s->avctx->palctrl->palette_changed = 0; } } done: *data_size = sizeof(AVFrame); *(AVFrame*)data = s->frame; /* always report that the buffer was completely consumed */ return buf_size; } static av_cold int qtrle_decode_end(AVCodecContext *avctx) { QtrleContext *s = avctx->priv_data; if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); return 0; } AVCodec qtrle_decoder = { "qtrle", CODEC_TYPE_VIDEO, CODEC_ID_QTRLE, sizeof(QtrleContext), qtrle_decode_init, NULL, qtrle_decode_end, qtrle_decode_frame, CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"), };