/* * 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 * 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 "avcodec.h" #include "bytestream.h" #include "internal.h" typedef struct QtrleContext { AVCodecContext *avctx; AVFrame *frame; GetByteContext g; uint32_t pal[256]; } QtrleContext; #define CHECK_PIXEL_PTR(n) \ if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \ av_log (s->avctx, AV_LOG_ERROR, "Problem: pixel_ptr = %d, pixel_limit = %d\n",\ pixel_ptr + n, pixel_limit); \ return; \ } \ static void qtrle_decode_1bpp(QtrleContext *s, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr; int row_inc = s->frame->linesize[0]; uint8_t pi0, pi1; /* 2 8-pixel values */ uint8_t *rgb = s->frame->data[0]; int pixel_limit = s->frame->linesize[0] * s->avctx->height; int skip; /* skip & 0x80 appears to mean 'start a new line', which can be interpreted * as 'go to next line' during the decoding of a frame but is 'go to first * line' at the beginning. Since we always interpret it as 'go to next line' * in the decoding loop (which makes code simpler/faster), the first line * would not be counted, so we count one more. * See: https://trac.ffmpeg.org/ticket/226 * In the following decoding loop, row_ptr will be the position of the * current row. */ row_ptr -= row_inc; pixel_ptr = row_ptr; lines_to_change++; while (lines_to_change) { skip = bytestream2_get_byte(&s->g); rle_code = (int8_t)bytestream2_get_byte(&s->g); 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 == -1) continue; 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 */ pi0 = bytestream2_get_byte(&s->g); pi1 = bytestream2_get_byte(&s->g); 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_PIXEL_PTR(rle_code); bytestream2_get_buffer(&s->g, &rgb[pixel_ptr], rle_code); pixel_ptr += rle_code; } } } static inline void qtrle_decode_2n4bpp(QtrleContext *s, int row_ptr, int lines_to_change, int bpp) { int rle_code, i; int pixel_ptr; int row_inc = s->frame->linesize[0]; uint8_t pi[16]; /* 16 palette indices */ uint8_t *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--) { pixel_ptr = row_ptr + (num_pixels * (bytestream2_get_byte(&s->g) - 1)); CHECK_PIXEL_PTR(0); while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ pixel_ptr += (num_pixels * (bytestream2_get_byte(&s->g) - 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 */ for (i = num_pixels-1; i >= 0; i--) { pi[num_pixels-1-i] = (bytestream2_peek_byte(&s->g) >> ((i*bpp) & 0x07)) & ((1<<bpp)-1); bytestream2_skip(&s->g, ((i & ((num_pixels>>2)-1)) == 0)); } CHECK_PIXEL_PTR(rle_code * num_pixels); while (rle_code--) { memcpy(&rgb[pixel_ptr], &pi, num_pixels); pixel_ptr += num_pixels; } } else { /* copy the same pixel directly to output 4 times */ rle_code *= 4; CHECK_PIXEL_PTR(rle_code*(num_pixels>>2)); while (rle_code--) { if(bpp == 4) { int x = bytestream2_get_byte(&s->g); rgb[pixel_ptr++] = (x >> 4) & 0x0f; rgb[pixel_ptr++] = x & 0x0f; } else { int x = bytestream2_get_byte(&s->g); rgb[pixel_ptr++] = (x >> 6) & 0x03; rgb[pixel_ptr++] = (x >> 4) & 0x03; rgb[pixel_ptr++] = (x >> 2) & 0x03; rgb[pixel_ptr++] = x & 0x03; } } } } row_ptr += row_inc; } } static void qtrle_decode_8bpp(QtrleContext *s, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr; int row_inc = s->frame->linesize[0]; uint8_t pi1, pi2, pi3, pi4; /* 4 palette indexes */ uint8_t *rgb = s->frame->data[0]; int pixel_limit = s->frame->linesize[0] * s->avctx->height; while (lines_to_change--) { pixel_ptr = row_ptr + (4 * (bytestream2_get_byte(&s->g) - 1)); CHECK_PIXEL_PTR(0); while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ pixel_ptr += (4 * (bytestream2_get_byte(&s->g) - 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 */ pi1 = bytestream2_get_byte(&s->g); pi2 = bytestream2_get_byte(&s->g); pi3 = bytestream2_get_byte(&s->g); pi4 = bytestream2_get_byte(&s->g); 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_PIXEL_PTR(rle_code); bytestream2_get_buffer(&s->g, &rgb[pixel_ptr], rle_code); pixel_ptr += rle_code; } } row_ptr += row_inc; } } static void qtrle_decode_16bpp(QtrleContext *s, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr; int row_inc = s->frame->linesize[0]; uint16_t rgb16; uint8_t *rgb = s->frame->data[0]; int pixel_limit = s->frame->linesize[0] * s->avctx->height; while (lines_to_change--) { pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 2; CHECK_PIXEL_PTR(0); while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ pixel_ptr += (bytestream2_get_byte(&s->g) - 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; rgb16 = bytestream2_get_be16(&s->g); CHECK_PIXEL_PTR(rle_code * 2); while (rle_code--) { *(uint16_t *)(&rgb[pixel_ptr]) = rgb16; pixel_ptr += 2; } } else { CHECK_PIXEL_PTR(rle_code * 2); /* copy pixels directly to output */ while (rle_code--) { rgb16 = bytestream2_get_be16(&s->g); *(uint16_t *)(&rgb[pixel_ptr]) = rgb16; pixel_ptr += 2; } } } row_ptr += row_inc; } } static void qtrle_decode_24bpp(QtrleContext *s, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr; int row_inc = s->frame->linesize[0]; uint8_t r, g, b; uint8_t *rgb = s->frame->data[0]; int pixel_limit = s->frame->linesize[0] * s->avctx->height; while (lines_to_change--) { pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 3; CHECK_PIXEL_PTR(0); while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ pixel_ptr += (bytestream2_get_byte(&s->g) - 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; r = bytestream2_get_byte(&s->g); g = bytestream2_get_byte(&s->g); b = bytestream2_get_byte(&s->g); CHECK_PIXEL_PTR(rle_code * 3); while (rle_code--) { rgb[pixel_ptr++] = r; rgb[pixel_ptr++] = g; rgb[pixel_ptr++] = b; } } else { CHECK_PIXEL_PTR(rle_code * 3); /* copy pixels directly to output */ while (rle_code--) { rgb[pixel_ptr++] = bytestream2_get_byte(&s->g); rgb[pixel_ptr++] = bytestream2_get_byte(&s->g); rgb[pixel_ptr++] = bytestream2_get_byte(&s->g); } } } row_ptr += row_inc; } } static void qtrle_decode_32bpp(QtrleContext *s, int row_ptr, int lines_to_change) { int rle_code; int pixel_ptr; int row_inc = s->frame->linesize[0]; unsigned int argb; uint8_t *rgb = s->frame->data[0]; int pixel_limit = s->frame->linesize[0] * s->avctx->height; while (lines_to_change--) { pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 4; CHECK_PIXEL_PTR(0); while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) { if (rle_code == 0) { /* there's another skip code in the stream */ pixel_ptr += (bytestream2_get_byte(&s->g) - 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; argb = bytestream2_get_be32(&s->g); CHECK_PIXEL_PTR(rle_code * 4); while (rle_code--) { AV_WN32A(rgb + pixel_ptr, argb); pixel_ptr += 4; } } else { CHECK_PIXEL_PTR(rle_code * 4); /* copy pixels directly to output */ while (rle_code--) { argb = bytestream2_get_be32(&s->g); AV_WN32A(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 = AV_PIX_FMT_MONOWHITE; break; case 2: case 4: case 8: case 34: case 36: case 40: avctx->pix_fmt = AV_PIX_FMT_PAL8; break; case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break; case 24: avctx->pix_fmt = AV_PIX_FMT_RGB24; break; case 32: avctx->pix_fmt = AV_PIX_FMT_RGB32; break; default: av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n", avctx->bits_per_coded_sample); return AVERROR_INVALIDDATA; } s->frame = av_frame_alloc(); if (!s->frame) return AVERROR(ENOMEM); return 0; } static int qtrle_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { QtrleContext *s = avctx->priv_data; int header, start_line; int height, row_ptr; int has_palette = 0; int ret; bytestream2_init(&s->g, avpkt->data, avpkt->size); if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) return ret; /* check if this frame is even supposed to change */ if (avpkt->size < 8) goto done; /* start after the chunk size */ bytestream2_seek(&s->g, 4, SEEK_SET); /* fetch the header */ header = bytestream2_get_be16(&s->g); /* if a header is present, fetch additional decoding parameters */ if (header & 0x0008) { if (avpkt->size < 14) goto done; start_line = bytestream2_get_be16(&s->g); bytestream2_skip(&s->g, 2); height = bytestream2_get_be16(&s->g); bytestream2_skip(&s->g, 2); if (height > s->avctx->height - start_line) goto done; } 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, row_ptr, height); break; case 2: case 34: qtrle_decode_2n4bpp(s, row_ptr, height, 2); has_palette = 1; break; case 4: case 36: qtrle_decode_2n4bpp(s, row_ptr, height, 4); has_palette = 1; break; case 8: case 40: qtrle_decode_8bpp(s, row_ptr, height); has_palette = 1; break; case 16: qtrle_decode_16bpp(s, row_ptr, height); break; case 24: 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", .long_name = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"), .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, };