mirror of
https://github.com/FFmpeg/FFmpeg.git
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393 lines
14 KiB
C
393 lines
14 KiB
C
/*
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* IFF PBM/ILBM bitmap decoder
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* Copyright (c) 2010 Peter Ross <pross@xvid.org>
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* Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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* IFF PBM/ILBM bitmap decoder
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*/
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#include "libavutil/imgutils.h"
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#include "bytestream.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "internal.h"
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typedef struct {
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AVFrame frame;
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int planesize;
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uint8_t * planebuf;
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int init; // 1 if buffer and palette data already initialized, 0 otherwise
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} IffContext;
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#define LUT8_PART(plane, v) \
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AV_LE2NE64C(UINT64_C(0x0000000)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x1000000)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x0010000)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x1010000)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x0000100)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x1000100)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x0010100)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x1010100)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x0000001)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x1000001)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x0010001)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x1010001)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x0000101)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x1000101)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x0010101)<<32 | v) << plane, \
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AV_LE2NE64C(UINT64_C(0x1010101)<<32 | v) << plane
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#define LUT8(plane) { \
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LUT8_PART(plane, 0x0000000), \
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LUT8_PART(plane, 0x1000000), \
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LUT8_PART(plane, 0x0010000), \
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LUT8_PART(plane, 0x1010000), \
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LUT8_PART(plane, 0x0000100), \
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LUT8_PART(plane, 0x1000100), \
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LUT8_PART(plane, 0x0010100), \
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LUT8_PART(plane, 0x1010100), \
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LUT8_PART(plane, 0x0000001), \
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LUT8_PART(plane, 0x1000001), \
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LUT8_PART(plane, 0x0010001), \
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LUT8_PART(plane, 0x1010001), \
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LUT8_PART(plane, 0x0000101), \
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LUT8_PART(plane, 0x1000101), \
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LUT8_PART(plane, 0x0010101), \
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LUT8_PART(plane, 0x1010101), \
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}
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// 8 planes * 8-bit mask
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static const uint64_t plane8_lut[8][256] = {
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LUT8(0), LUT8(1), LUT8(2), LUT8(3),
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LUT8(4), LUT8(5), LUT8(6), LUT8(7),
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};
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#define LUT32(plane) { \
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0, 0, 0, 0, \
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0, 0, 0, 1 << plane, \
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0, 0, 1 << plane, 0, \
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0, 0, 1 << plane, 1 << plane, \
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0, 1 << plane, 0, 0, \
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0, 1 << plane, 0, 1 << plane, \
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0, 1 << plane, 1 << plane, 0, \
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0, 1 << plane, 1 << plane, 1 << plane, \
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1 << plane, 0, 0, 0, \
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1 << plane, 0, 0, 1 << plane, \
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1 << plane, 0, 1 << plane, 0, \
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1 << plane, 0, 1 << plane, 1 << plane, \
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1 << plane, 1 << plane, 0, 0, \
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1 << plane, 1 << plane, 0, 1 << plane, \
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1 << plane, 1 << plane, 1 << plane, 0, \
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1 << plane, 1 << plane, 1 << plane, 1 << plane, \
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}
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// 32 planes * 4-bit mask * 4 lookup tables each
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static const uint32_t plane32_lut[32][16*4] = {
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LUT32( 0), LUT32( 1), LUT32( 2), LUT32( 3),
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LUT32( 4), LUT32( 5), LUT32( 6), LUT32( 7),
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LUT32( 8), LUT32( 9), LUT32(10), LUT32(11),
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LUT32(12), LUT32(13), LUT32(14), LUT32(15),
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LUT32(16), LUT32(17), LUT32(18), LUT32(19),
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LUT32(20), LUT32(21), LUT32(22), LUT32(23),
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LUT32(24), LUT32(25), LUT32(26), LUT32(27),
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LUT32(28), LUT32(29), LUT32(30), LUT32(31),
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};
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// Gray to RGB, required for palette table of grayscale images with bpp < 8
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static av_always_inline uint32_t gray2rgb(const uint32_t x) {
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return x << 16 | x << 8 | x;
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}
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/**
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* Convert CMAP buffer (stored in extradata) to lavc palette format
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*/
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static int cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
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{
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int count, i;
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if (avctx->bits_per_coded_sample > 8) {
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av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
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return AVERROR_INVALIDDATA;
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}
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count = 1 << avctx->bits_per_coded_sample;
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// If extradata is smaller than actually needed, fill the remaining with black.
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count = FFMIN(avctx->extradata_size / 3, count);
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if (count) {
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for (i = 0; i < count; i++)
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pal[i] = 0xFF000000 | AV_RB24(avctx->extradata + i * 3);
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} else { // Create gray-scale color palette for bps < 8
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count = 1 << avctx->bits_per_coded_sample;
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for (i = 0; i < count; i++)
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pal[i] = 0xFF000000 | gray2rgb((i * 255) >> avctx->bits_per_coded_sample);
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}
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return 0;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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IffContext *s = avctx->priv_data;
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int err;
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if (avctx->bits_per_coded_sample <= 8) {
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avctx->pix_fmt = (avctx->bits_per_coded_sample < 8 ||
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avctx->extradata_size) ? AV_PIX_FMT_PAL8
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: AV_PIX_FMT_GRAY8;
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} else if (avctx->bits_per_coded_sample <= 32) {
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avctx->pix_fmt = AV_PIX_FMT_BGR32;
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} else {
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return AVERROR_INVALIDDATA;
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}
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if ((err = av_image_check_size(avctx->width, avctx->height, 0, avctx)))
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return err;
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s->planesize = FFALIGN(avctx->width, 16) >> 3; // Align plane size in bits to word-boundary
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s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!s->planebuf)
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return AVERROR(ENOMEM);
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avcodec_get_frame_defaults(&s->frame);
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return 0;
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}
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/**
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* Decode interleaved plane buffer up to 8bpp
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* @param dst Destination buffer
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* @param buf Source buffer
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* @param buf_size
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* @param plane plane number to decode as
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*/
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static void decodeplane8(uint8_t *dst, const uint8_t *buf, int buf_size, int plane)
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{
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const uint64_t *lut = plane8_lut[plane];
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do {
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uint64_t v = AV_RN64A(dst) | lut[*buf++];
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AV_WN64A(dst, v);
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dst += 8;
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} while (--buf_size);
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}
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/**
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* Decode interleaved plane buffer up to 24bpp
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* @param dst Destination buffer
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* @param buf Source buffer
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* @param buf_size
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* @param plane plane number to decode as
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*/
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static void decodeplane32(uint32_t *dst, const uint8_t *buf, int buf_size, int plane)
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{
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const uint32_t *lut = plane32_lut[plane];
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do {
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unsigned mask = (*buf >> 2) & ~3;
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dst[0] |= lut[mask++];
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dst[1] |= lut[mask++];
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dst[2] |= lut[mask++];
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dst[3] |= lut[mask];
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mask = (*buf++ << 2) & 0x3F;
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dst[4] |= lut[mask++];
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dst[5] |= lut[mask++];
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dst[6] |= lut[mask++];
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dst[7] |= lut[mask];
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dst += 8;
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} while (--buf_size);
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}
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/**
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* Decode one complete byterun1 encoded line.
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*
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* @param dst the destination buffer where to store decompressed bitstream
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* @param dst_size the destination plane size in bytes
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* @param buf the source byterun1 compressed bitstream
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* @param buf_end the EOF of source byterun1 compressed bitstream
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* @return number of consumed bytes in byterun1 compressed bitstream
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*/
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static int decode_byterun(uint8_t *dst, int dst_size,
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const uint8_t *buf, const uint8_t *const buf_end)
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{
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const uint8_t *const buf_start = buf;
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unsigned x;
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for (x = 0; x < dst_size && buf < buf_end;) {
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unsigned length;
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const int8_t value = *buf++;
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if (value >= 0) {
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length = value + 1;
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memcpy(dst + x, buf, FFMIN3(length, dst_size - x, buf_end - buf));
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buf += length;
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} else if (value > -128) {
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length = -value + 1;
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memset(dst + x, *buf++, FFMIN(length, dst_size - x));
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} else { // noop
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continue;
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}
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x += length;
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}
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return buf - buf_start;
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}
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static int decode_frame_ilbm(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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IffContext *s = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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const uint8_t *buf_end = buf + buf_size;
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int y, plane, res;
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if ((res = ff_reget_buffer(avctx, &s->frame)) < 0)
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return res;
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if (!s->init && avctx->bits_per_coded_sample <= 8 &&
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avctx->pix_fmt != AV_PIX_FMT_GRAY8) {
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if ((res = cmap_read_palette(avctx, (uint32_t *)s->frame.data[1])) < 0)
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return res;
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}
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s->init = 1;
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if (avctx->codec_tag == MKTAG('I', 'L', 'B', 'M')) { // interleaved
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if (avctx->pix_fmt == AV_PIX_FMT_PAL8 || avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
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for (y = 0; y < avctx->height; y++) {
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uint8_t *row = &s->frame.data[0][y * s->frame.linesize[0]];
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memset(row, 0, avctx->width);
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for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end;
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plane++) {
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decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), plane);
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buf += s->planesize;
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}
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}
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} else { // AV_PIX_FMT_BGR32
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for (y = 0; y < avctx->height; y++) {
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uint8_t *row = &s->frame.data[0][y * s->frame.linesize[0]];
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memset(row, 0, avctx->width << 2);
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for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end;
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plane++) {
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decodeplane32((uint32_t *)row, buf,
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FFMIN(s->planesize, buf_end - buf), plane);
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buf += s->planesize;
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}
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}
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}
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} else if (avctx->pix_fmt == AV_PIX_FMT_PAL8 || avctx->pix_fmt == AV_PIX_FMT_GRAY8) { // IFF-PBM
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for (y = 0; y < avctx->height && buf < buf_end; y++) {
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uint8_t *row = &s->frame.data[0][y * s->frame.linesize[0]];
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memcpy(row, buf, FFMIN(avctx->width, buf_end - buf));
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buf += avctx->width + (avctx->width % 2); // padding if odd
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}
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}
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if ((res = av_frame_ref(data, &s->frame)) < 0)
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return res;
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*got_frame = 1;
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return buf_size;
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}
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static int decode_frame_byterun1(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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IffContext *s = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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const uint8_t *buf_end = buf + buf_size;
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int y, plane, res;
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if ((res = ff_reget_buffer(avctx, &s->frame)) < 0)
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return res;
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if (!s->init && avctx->bits_per_coded_sample <= 8 &&
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avctx->pix_fmt != AV_PIX_FMT_GRAY8) {
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if ((res = cmap_read_palette(avctx, (uint32_t *)s->frame.data[1])) < 0)
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return res;
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}
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s->init = 1;
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if (avctx->codec_tag == MKTAG('I', 'L', 'B', 'M')) { // interleaved
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if (avctx->pix_fmt == AV_PIX_FMT_PAL8 || avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
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for (y = 0; y < avctx->height; y++) {
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uint8_t *row = &s->frame.data[0][y * s->frame.linesize[0]];
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memset(row, 0, avctx->width);
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for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
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buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);
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decodeplane8(row, s->planebuf, s->planesize, plane);
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}
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}
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} else { // AV_PIX_FMT_BGR32
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for (y = 0; y < avctx->height; y++) {
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uint8_t *row = &s->frame.data[0][y * s->frame.linesize[0]];
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memset(row, 0, avctx->width << 2);
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for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
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buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);
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decodeplane32((uint32_t *)row, s->planebuf, s->planesize, plane);
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}
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}
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}
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} else {
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for (y = 0; y < avctx->height; y++) {
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uint8_t *row = &s->frame.data[0][y * s->frame.linesize[0]];
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buf += decode_byterun(row, avctx->width, buf, buf_end);
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}
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}
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if ((res = av_frame_ref(data, &s->frame)) < 0)
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return res;
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*got_frame = 1;
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return buf_size;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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IffContext *s = avctx->priv_data;
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av_frame_unref(&s->frame);
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av_freep(&s->planebuf);
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return 0;
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}
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AVCodec ff_iff_ilbm_decoder = {
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.name = "iff_ilbm",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_IFF_ILBM,
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.priv_data_size = sizeof(IffContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame_ilbm,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
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};
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AVCodec ff_iff_byterun1_decoder = {
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.name = "iff_byterun1",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_IFF_BYTERUN1,
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.priv_data_size = sizeof(IffContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame_byterun1,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
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};
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