523 lines
17 KiB
C
Executable File
523 lines
17 KiB
C
Executable File
/*
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* Cryo Interactive Entertainment HNM4 video decoder
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*
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* Copyright (c) 2012 David Kment
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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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#include <string.h>
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#include "libavutil/imgutils.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.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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#define HNM4_CHUNK_ID_PL 19536
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#define HNM4_CHUNK_ID_IZ 23113
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#define HNM4_CHUNK_ID_IU 21833
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#define HNM4_CHUNK_ID_SD 17491
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typedef struct Hnm4VideoContext {
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uint8_t version;
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int width;
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int height;
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uint8_t *current;
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uint8_t *previous;
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uint8_t *buffer1;
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uint8_t *buffer2;
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uint8_t *processed;
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uint32_t palette[256];
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} Hnm4VideoContext;
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static int getbit(GetByteContext *gb, uint32_t *bitbuf, int *bits)
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{
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int ret;
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if (!*bits) {
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*bitbuf = bytestream2_get_le32(gb);
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*bits = 32;
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}
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ret = *bitbuf >> 31;
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*bitbuf <<= 1;
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(*bits)--;
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return ret;
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}
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static void unpack_intraframe(AVCodecContext *avctx, uint8_t *src,
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uint32_t size)
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{
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Hnm4VideoContext *hnm = avctx->priv_data;
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GetByteContext gb;
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uint32_t bitbuf = 0, writeoffset = 0, count = 0;
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uint16_t word;
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int32_t offset;
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int bits = 0;
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bytestream2_init(&gb, src, size);
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while (bytestream2_tell(&gb) < size) {
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if (getbit(&gb, &bitbuf, &bits)) {
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if (writeoffset >= hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR,
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"Attempting to write out of bounds\n");
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break;
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}
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hnm->current[writeoffset++] = bytestream2_get_byte(&gb);
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} else {
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if (getbit(&gb, &bitbuf, &bits)) {
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word = bytestream2_get_le16(&gb);
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count = word & 0x07;
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offset = (word >> 3) - 0x2000;
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if (!count)
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count = bytestream2_get_byte(&gb);
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if (!count)
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return;
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} else {
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count = getbit(&gb, &bitbuf, &bits) * 2;
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count += getbit(&gb, &bitbuf, &bits);
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offset = bytestream2_get_byte(&gb) - 0x0100;
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}
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count += 2;
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offset += writeoffset;
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if (offset < 0 || offset + count >= hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
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break;
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} else if (writeoffset + count >= hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR,
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"Attempting to write out of bounds\n");
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break;
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}
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while (count--) {
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hnm->current[writeoffset++] = hnm->current[offset++];
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}
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}
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}
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}
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static void postprocess_current_frame(AVCodecContext *avctx)
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{
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Hnm4VideoContext *hnm = avctx->priv_data;
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uint32_t x, y, src_y;
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int width = hnm->width;
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for (y = 0; y < hnm->height; y++) {
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uint8_t *dst = hnm->processed + y * width;
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const uint8_t *src = hnm->current;
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src_y = y - (y % 2);
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src += src_y * width + (y % 2);
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for (x = 0; x < width; x++) {
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dst[x] = *src;
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src += 2;
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}
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}
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}
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static void copy_processed_frame(AVCodecContext *avctx, AVFrame *frame)
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{
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Hnm4VideoContext *hnm = avctx->priv_data;
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uint8_t *src = hnm->processed;
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uint8_t *dst = frame->data[0];
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int y;
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for (y = 0; y < hnm->height; y++) {
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memcpy(dst, src, hnm->width);
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src += hnm->width;
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dst += frame->linesize[0];
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}
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}
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static int decode_interframe_v4(AVCodecContext *avctx, uint8_t *src, uint32_t size)
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{
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Hnm4VideoContext *hnm = avctx->priv_data;
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GetByteContext gb;
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uint32_t writeoffset = 0;
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int count, left, offset;
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uint8_t tag, previous, backline, backward, swap;
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bytestream2_init(&gb, src, size);
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while (bytestream2_tell(&gb) < size) {
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count = bytestream2_peek_byte(&gb) & 0x1F;
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if (count == 0) {
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tag = bytestream2_get_byte(&gb) & 0xE0;
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tag = tag >> 5;
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if (tag == 0) {
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if (writeoffset + 2 > hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
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return AVERROR_INVALIDDATA;
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}
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hnm->current[writeoffset++] = bytestream2_get_byte(&gb);
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hnm->current[writeoffset++] = bytestream2_get_byte(&gb);
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} else if (tag == 1) {
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writeoffset += bytestream2_get_byte(&gb) * 2;
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} else if (tag == 2) {
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count = bytestream2_get_le16(&gb);
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count *= 2;
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writeoffset += count;
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} else if (tag == 3) {
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count = bytestream2_get_byte(&gb) * 2;
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if (writeoffset + count > hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
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return AVERROR_INVALIDDATA;
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}
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while (count > 0) {
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hnm->current[writeoffset++] = bytestream2_peek_byte(&gb);
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count--;
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}
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bytestream2_skip(&gb, 1);
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} else {
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break;
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}
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if (writeoffset > hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
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return AVERROR_INVALIDDATA;
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}
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} else {
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previous = bytestream2_peek_byte(&gb) & 0x20;
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backline = bytestream2_peek_byte(&gb) & 0x40;
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backward = bytestream2_peek_byte(&gb) & 0x80;
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bytestream2_skip(&gb, 1);
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swap = bytestream2_peek_byte(&gb) & 0x01;
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offset = bytestream2_get_le16(&gb);
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offset = (offset >> 1) & 0x7FFF;
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offset = writeoffset + (offset * 2) - 0x8000;
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left = count;
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if (!backward && offset + 2*count > hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
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return AVERROR_INVALIDDATA;
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} else if (backward && offset + 1 >= hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
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return AVERROR_INVALIDDATA;
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} else if (writeoffset + 2*count > hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR,
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"Attempting to write out of bounds\n");
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return AVERROR_INVALIDDATA;
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}
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if(backward) {
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if (offset < (!!backline)*(2 * hnm->width - 1) + 2*(left-1)) {
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av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
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return AVERROR_INVALIDDATA;
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}
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} else {
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if (offset < (!!backline)*(2 * hnm->width - 1)) {
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av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
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return AVERROR_INVALIDDATA;
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}
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}
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if (previous) {
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while (left > 0) {
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if (backline) {
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hnm->current[writeoffset++] = hnm->previous[offset - (2 * hnm->width) + 1];
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hnm->current[writeoffset++] = hnm->previous[offset++];
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offset++;
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} else {
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hnm->current[writeoffset++] = hnm->previous[offset++];
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hnm->current[writeoffset++] = hnm->previous[offset++];
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}
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if (backward)
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offset -= 4;
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left--;
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}
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} else {
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while (left > 0) {
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if (backline) {
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hnm->current[writeoffset++] = hnm->current[offset - (2 * hnm->width) + 1];
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hnm->current[writeoffset++] = hnm->current[offset++];
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offset++;
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} else {
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hnm->current[writeoffset++] = hnm->current[offset++];
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hnm->current[writeoffset++] = hnm->current[offset++];
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}
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if (backward)
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offset -= 4;
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left--;
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}
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}
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if (swap) {
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left = count;
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writeoffset -= count * 2;
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while (left > 0) {
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swap = hnm->current[writeoffset];
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hnm->current[writeoffset] = hnm->current[writeoffset + 1];
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hnm->current[writeoffset + 1] = swap;
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left--;
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writeoffset += 2;
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}
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}
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}
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}
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return 0;
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}
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static void decode_interframe_v4a(AVCodecContext *avctx, uint8_t *src,
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uint32_t size)
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{
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Hnm4VideoContext *hnm = avctx->priv_data;
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GetByteContext gb;
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uint32_t writeoffset = 0, offset;
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uint8_t tag, count, previous, delta;
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bytestream2_init(&gb, src, size);
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while (bytestream2_tell(&gb) < size) {
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count = bytestream2_peek_byte(&gb) & 0x3F;
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if (count == 0) {
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tag = bytestream2_get_byte(&gb) & 0xC0;
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tag = tag >> 6;
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if (tag == 0) {
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writeoffset += bytestream2_get_byte(&gb);
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} else if (tag == 1) {
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if (writeoffset + hnm->width >= hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
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break;
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}
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hnm->current[writeoffset] = bytestream2_get_byte(&gb);
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hnm->current[writeoffset + hnm->width] = bytestream2_get_byte(&gb);
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writeoffset++;
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} else if (tag == 2) {
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writeoffset += hnm->width;
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} else if (tag == 3) {
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break;
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}
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if (writeoffset > hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n");
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break;
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}
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} else {
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delta = bytestream2_peek_byte(&gb) & 0x80;
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previous = bytestream2_peek_byte(&gb) & 0x40;
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bytestream2_skip(&gb, 1);
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offset = writeoffset;
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offset += bytestream2_get_le16(&gb);
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if (delta) {
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if (offset < 0x10000) {
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av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
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break;
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}
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offset -= 0x10000;
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}
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if (offset + hnm->width + count >= hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n");
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break;
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} else if (writeoffset + hnm->width + count >= hnm->width * hnm->height) {
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av_log(avctx, AV_LOG_ERROR, "Attempting to write out of bounds\n");
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break;
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}
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if (previous) {
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while (count > 0) {
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hnm->current[writeoffset] = hnm->previous[offset];
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hnm->current[writeoffset + hnm->width] = hnm->previous[offset + hnm->width];
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writeoffset++;
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offset++;
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count--;
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}
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} else {
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while (count > 0) {
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hnm->current[writeoffset] = hnm->current[offset];
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hnm->current[writeoffset + hnm->width] = hnm->current[offset + hnm->width];
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writeoffset++;
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offset++;
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count--;
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}
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}
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}
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}
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}
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static void hnm_update_palette(AVCodecContext *avctx, uint8_t *src,
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uint32_t size)
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{
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Hnm4VideoContext *hnm = avctx->priv_data;
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GetByteContext gb;
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uint8_t start, writeoffset;
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uint16_t count;
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int eight_bit_colors;
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eight_bit_colors = src[7] & 0x80 && hnm->version == 0x4a;
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// skip first 8 bytes
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bytestream2_init(&gb, src + 8, size - 8);
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while (bytestream2_tell(&gb) < size - 8) {
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start = bytestream2_get_byte(&gb);
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count = bytestream2_get_byte(&gb);
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if (start == 255 && count == 255)
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break;
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if (count == 0)
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count = 256;
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writeoffset = start;
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while (count > 0) {
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hnm->palette[writeoffset] = bytestream2_get_be24(&gb);
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if (!eight_bit_colors)
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hnm->palette[writeoffset] <<= 2;
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hnm->palette[writeoffset] |= (0xFFU << 24);
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count--;
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writeoffset++;
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}
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}
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}
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static void hnm_flip_buffers(Hnm4VideoContext *hnm)
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{
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uint8_t *temp;
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temp = hnm->current;
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hnm->current = hnm->previous;
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hnm->previous = temp;
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}
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static int hnm_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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AVFrame *frame = data;
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Hnm4VideoContext *hnm = avctx->priv_data;
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int ret;
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uint16_t chunk_id;
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if (avpkt->size < 8) {
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av_log(avctx, AV_LOG_ERROR, "packet too small\n");
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return AVERROR_INVALIDDATA;
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}
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chunk_id = AV_RL16(avpkt->data + 4);
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if (chunk_id == HNM4_CHUNK_ID_PL) {
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hnm_update_palette(avctx, avpkt->data, avpkt->size);
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} else if (chunk_id == HNM4_CHUNK_ID_IZ) {
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if (avpkt->size < 12) {
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av_log(avctx, AV_LOG_ERROR, "packet too small\n");
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return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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unpack_intraframe(avctx, avpkt->data + 12, avpkt->size - 12);
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memcpy(hnm->previous, hnm->current, hnm->width * hnm->height);
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if (hnm->version == 0x4a)
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memcpy(hnm->processed, hnm->current, hnm->width * hnm->height);
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else
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postprocess_current_frame(avctx);
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copy_processed_frame(avctx, frame);
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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memcpy(frame->data[1], hnm->palette, 256 * 4);
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*got_frame = 1;
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} else if (chunk_id == HNM4_CHUNK_ID_IU) {
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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if (hnm->version == 0x4a) {
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decode_interframe_v4a(avctx, avpkt->data + 8, avpkt->size - 8);
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memcpy(hnm->processed, hnm->current, hnm->width * hnm->height);
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} else {
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int ret = decode_interframe_v4(avctx, avpkt->data + 8, avpkt->size - 8);
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if (ret < 0)
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return ret;
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postprocess_current_frame(avctx);
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}
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copy_processed_frame(avctx, frame);
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frame->pict_type = AV_PICTURE_TYPE_P;
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frame->key_frame = 0;
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memcpy(frame->data[1], hnm->palette, 256 * 4);
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*got_frame = 1;
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hnm_flip_buffers(hnm);
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} else {
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av_log(avctx, AV_LOG_ERROR, "invalid chunk id: %d\n", chunk_id);
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return AVERROR_INVALIDDATA;
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}
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return avpkt->size;
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}
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static av_cold int hnm_decode_init(AVCodecContext *avctx)
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{
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Hnm4VideoContext *hnm = avctx->priv_data;
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int ret;
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if (avctx->extradata_size < 1) {
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av_log(avctx, AV_LOG_ERROR,
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"Extradata missing, decoder requires version number\n");
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return AVERROR_INVALIDDATA;
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}
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ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
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if (ret < 0)
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return ret;
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hnm->version = avctx->extradata[0];
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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hnm->width = avctx->width;
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hnm->height = avctx->height;
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hnm->buffer1 = av_mallocz(avctx->width * avctx->height);
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hnm->buffer2 = av_mallocz(avctx->width * avctx->height);
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hnm->processed = av_mallocz(avctx->width * avctx->height);
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if ( !hnm->buffer1 || !hnm->buffer2 || !hnm->processed
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|| avctx->width * avctx->height == 0
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|
|| avctx->height % 2) {
|
|
av_log(avctx, AV_LOG_ERROR, "av_mallocz() failed\n");
|
|
av_freep(&hnm->buffer1);
|
|
av_freep(&hnm->buffer2);
|
|
av_freep(&hnm->processed);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
hnm->current = hnm->buffer1;
|
|
hnm->previous = hnm->buffer2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int hnm_decode_end(AVCodecContext *avctx)
|
|
{
|
|
Hnm4VideoContext *hnm = avctx->priv_data;
|
|
|
|
av_freep(&hnm->buffer1);
|
|
av_freep(&hnm->buffer2);
|
|
av_freep(&hnm->processed);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_hnm4_video_decoder = {
|
|
.name = "hnm4video",
|
|
.long_name = NULL_IF_CONFIG_SMALL("HNM 4 video"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_HNM4_VIDEO,
|
|
.priv_data_size = sizeof(Hnm4VideoContext),
|
|
.init = hnm_decode_init,
|
|
.close = hnm_decode_end,
|
|
.decode = hnm_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|