458 lines
13 KiB
C
458 lines
13 KiB
C
/*
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* Packed Animation File video and audio decoder
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* Copyright (c) 2012 Paul B Mahol
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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 "libavutil/intreadwrite.h"
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#include "libavcodec/dsputil.h"
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#include "libavcodec/paf.h"
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#include "bytestream.h"
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#include "avcodec.h"
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#include "internal.h"
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static const uint8_t block_sequences[16][8] =
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{
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{ 0, 0, 0, 0, 0, 0, 0, 0 },
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{ 2, 0, 0, 0, 0, 0, 0, 0 },
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{ 5, 7, 0, 0, 0, 0, 0, 0 },
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{ 5, 0, 0, 0, 0, 0, 0, 0 },
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{ 6, 0, 0, 0, 0, 0, 0, 0 },
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{ 5, 7, 5, 7, 0, 0, 0, 0 },
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{ 5, 7, 5, 0, 0, 0, 0, 0 },
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{ 5, 7, 6, 0, 0, 0, 0, 0 },
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{ 5, 5, 0, 0, 0, 0, 0, 0 },
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{ 3, 0, 0, 0, 0, 0, 0, 0 },
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{ 6, 6, 0, 0, 0, 0, 0, 0 },
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{ 2, 4, 0, 0, 0, 0, 0, 0 },
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{ 2, 4, 5, 7, 0, 0, 0, 0 },
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{ 2, 4, 5, 0, 0, 0, 0, 0 },
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{ 2, 4, 6, 0, 0, 0, 0, 0 },
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{ 2, 4, 5, 7, 5, 7, 0, 0 }
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};
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typedef struct PAFVideoDecContext {
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AVFrame pic;
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GetByteContext gb;
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int current_frame;
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uint8_t *frame[4];
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int frame_size;
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int video_size;
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uint8_t *opcodes;
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} PAFVideoDecContext;
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static av_cold int paf_vid_init(AVCodecContext *avctx)
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{
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PAFVideoDecContext *c = avctx->priv_data;
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int i;
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if (avctx->height & 3 || avctx->width & 3) {
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av_log(avctx, AV_LOG_ERROR, "width and height must be multiplies of 4\n");
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return AVERROR_INVALIDDATA;
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}
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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avcodec_get_frame_defaults(&c->pic);
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c->frame_size = FFALIGN(avctx->height, 256) * avctx->width;
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c->video_size = avctx->height * avctx->width;
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for (i = 0; i < 4; i++) {
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c->frame[i] = av_mallocz(c->frame_size);
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if (!c->frame[i])
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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static int get_video_page_offset(AVCodecContext *avctx, uint8_t a, uint8_t b)
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{
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int x, y;
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x = b & 0x7F;
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y = ((a & 0x3F) << 1) | (b >> 7 & 1);
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return y * 2 * avctx->width + x * 2;
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}
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static void copy4h(AVCodecContext *avctx, uint8_t *dst)
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{
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PAFVideoDecContext *c = avctx->priv_data;
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int i;
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for (i = 0; i < 4; i++) {
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bytestream2_get_buffer(&c->gb, dst, 4);
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dst += avctx->width;
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}
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}
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static void copy_color_mask(AVCodecContext *avctx, uint8_t mask, uint8_t *dst, uint8_t color)
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{
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int i;
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for (i = 0; i < 4; i++) {
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if ((mask >> 4) & (1 << (3 - i)))
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dst[i] = color;
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if ((mask & 15) & (1 << (3 - i)))
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dst[avctx->width + i] = color;
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}
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}
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static void copy_src_mask(AVCodecContext *avctx, uint8_t mask, uint8_t *dst, const uint8_t *src)
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{
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int i;
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for (i = 0; i < 4; i++) {
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if ((mask >> 4) & (1 << (3 - i)))
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dst[i] = src[i];
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if ((mask & 15) & (1 << (3 - i)))
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dst[avctx->width + i] = src[avctx->width + i];
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}
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}
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static int decode_0(AVCodecContext *avctx, uint8_t code, uint8_t *pkt)
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{
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PAFVideoDecContext *c = avctx->priv_data;
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uint32_t opcode_size, offset;
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uint8_t *dst, *dend, mask = 0, color = 0, a, b, p;
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const uint8_t *src, *send, *opcodes;
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int i, j, x = 0;
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i = bytestream2_get_byte(&c->gb);
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if (i) {
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if (code & 0x10) {
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int align;
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align = bytestream2_tell(&c->gb) & 3;
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if (align)
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bytestream2_skip(&c->gb, 4 - align);
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}
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do {
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a = bytestream2_get_byte(&c->gb);
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b = bytestream2_get_byte(&c->gb);
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p = (a & 0xC0) >> 6;
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dst = c->frame[p] + get_video_page_offset(avctx, a, b);
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dend = c->frame[p] + c->frame_size;
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offset = (b & 0x7F) * 2;
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j = bytestream2_get_le16(&c->gb) + offset;
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do {
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offset++;
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if (dst + 3 * avctx->width + 4 > dend)
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return AVERROR_INVALIDDATA;
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copy4h(avctx, dst);
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if ((offset & 0x3F) == 0)
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dst += avctx->width * 3;
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dst += 4;
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} while (offset < j);
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} while (--i);
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}
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dst = c->frame[c->current_frame];
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dend = c->frame[c->current_frame] + c->frame_size;
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do {
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a = bytestream2_get_byte(&c->gb);
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b = bytestream2_get_byte(&c->gb);
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p = (a & 0xC0) >> 6;
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src = c->frame[p] + get_video_page_offset(avctx, a, b);
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send = c->frame[p] + c->frame_size;
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if ((src + 3 * avctx->width + 4 > send) ||
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(dst + 3 * avctx->width + 4 > dend))
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return AVERROR_INVALIDDATA;
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copy_block4(dst, src, avctx->width, avctx->width, 4);
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i++;
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if ((i & 0x3F) == 0)
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dst += avctx->width * 3;
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dst += 4;
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} while (i < c->video_size / 16);
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opcode_size = bytestream2_get_le16(&c->gb);
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bytestream2_skip(&c->gb, 2);
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if (bytestream2_get_bytes_left(&c->gb) < opcode_size)
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return AVERROR_INVALIDDATA;
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opcodes = pkt + bytestream2_tell(&c->gb);
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bytestream2_skipu(&c->gb, opcode_size);
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dst = c->frame[c->current_frame];
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for (i = 0; i < avctx->height; i += 4, dst += avctx->width * 3) {
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for (j = 0; j < avctx->width; j += 4, dst += 4) {
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int opcode, k = 0;
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if (x > opcode_size)
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return AVERROR_INVALIDDATA;
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if (j & 4) {
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opcode = opcodes[x] & 15;
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x++;
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} else {
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opcode = opcodes[x] >> 4;
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}
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while (block_sequences[opcode][k]) {
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offset = avctx->width * 2;
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code = block_sequences[opcode][k++];
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switch (code) {
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case 2:
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offset = 0;
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case 3:
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color = bytestream2_get_byte(&c->gb);
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case 4:
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mask = bytestream2_get_byte(&c->gb);
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copy_color_mask(avctx, mask, dst + offset, color);
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break;
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case 5:
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offset = 0;
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case 6:
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a = bytestream2_get_byte(&c->gb);
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b = bytestream2_get_byte(&c->gb);
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p = (a & 0xC0) >> 6;
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src = c->frame[p] + get_video_page_offset(avctx, a, b);
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send = c->frame[p] + c->frame_size;
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case 7:
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if (src + offset + avctx->width + 4 > send)
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return AVERROR_INVALIDDATA;
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mask = bytestream2_get_byte(&c->gb);
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copy_src_mask(avctx, mask, dst + offset, src + offset);
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break;
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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 int paf_vid_decode(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *pkt)
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{
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PAFVideoDecContext *c = avctx->priv_data;
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uint8_t code, *dst, *src, *end;
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int i, frame, ret;
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c->pic.reference = 3;
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if ((ret = avctx->reget_buffer(avctx, &c->pic)) < 0)
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return ret;
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bytestream2_init(&c->gb, pkt->data, pkt->size);
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code = bytestream2_get_byte(&c->gb);
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if (code & 0x20) {
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for (i = 0; i < 4; i++)
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memset(c->frame[i], 0, c->frame_size);
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memset(c->pic.data[1], 0, AVPALETTE_SIZE);
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c->current_frame = 0;
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c->pic.key_frame = 1;
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c->pic.pict_type = AV_PICTURE_TYPE_I;
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} else {
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c->pic.key_frame = 0;
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c->pic.pict_type = AV_PICTURE_TYPE_P;
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}
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if (code & 0x40) {
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uint32_t *out = (uint32_t *)c->pic.data[1];
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int index, count;
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index = bytestream2_get_byte(&c->gb);
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count = bytestream2_get_byte(&c->gb) + 1;
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if (index + count > 256)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_bytes_left(&c->gb) < 3*count)
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return AVERROR_INVALIDDATA;
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out += index;
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for (i = 0; i < count; i++) {
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unsigned r, g, b;
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r = bytestream2_get_byteu(&c->gb);
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r = r << 2 | r >> 4;
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g = bytestream2_get_byteu(&c->gb);
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g = g << 2 | g >> 4;
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b = bytestream2_get_byteu(&c->gb);
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b = b << 2 | b >> 4;
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*out++ = 0xFFU << 24 | r << 16 | g << 8 | b;
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}
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c->pic.palette_has_changed = 1;
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}
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switch (code & 0x0F) {
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case 0:
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if ((ret = decode_0(avctx, code, pkt->data)) < 0)
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return ret;
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break;
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case 1:
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dst = c->frame[c->current_frame];
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bytestream2_skip(&c->gb, 2);
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if (bytestream2_get_bytes_left(&c->gb) < c->video_size)
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return AVERROR_INVALIDDATA;
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bytestream2_get_bufferu(&c->gb, dst, c->video_size);
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break;
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case 2:
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frame = bytestream2_get_byte(&c->gb);
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if (frame > 3)
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return AVERROR_INVALIDDATA;
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if (frame != c->current_frame)
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memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size);
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break;
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case 4:
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dst = c->frame[c->current_frame];
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end = dst + c->video_size;
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bytestream2_skip(&c->gb, 2);
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while (dst < end) {
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int8_t code;
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int count;
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if (bytestream2_get_bytes_left(&c->gb) < 2)
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return AVERROR_INVALIDDATA;
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code = bytestream2_get_byteu(&c->gb);
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count = FFABS(code) + 1;
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if (dst + count > end)
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return AVERROR_INVALIDDATA;
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if (code < 0)
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memset(dst, bytestream2_get_byteu(&c->gb), count);
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else
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bytestream2_get_buffer(&c->gb, dst, count);
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dst += count;
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}
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break;
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default:
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av_log_ask_for_sample(avctx, "unknown/invalid code\n");
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return AVERROR_INVALIDDATA;
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}
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dst = c->pic.data[0];
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src = c->frame[c->current_frame];
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for (i = 0; i < avctx->height; i++) {
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memcpy(dst, src, avctx->width);
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dst += c->pic.linesize[0];
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src += avctx->width;
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}
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c->current_frame = (c->current_frame + 1) & 3;
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*got_frame = 1;
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*(AVFrame *)data = c->pic;
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return pkt->size;
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}
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static av_cold int paf_vid_close(AVCodecContext *avctx)
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{
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PAFVideoDecContext *c = avctx->priv_data;
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int i;
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if (c->pic.data[0])
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avctx->release_buffer(avctx, &c->pic);
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for (i = 0; i < 4; i++)
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av_freep(&c->frame[i]);
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return 0;
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}
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typedef struct PAFAudioDecContext {
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AVFrame frame;
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} PAFAudioDecContext;
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static av_cold int paf_aud_init(AVCodecContext *avctx)
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{
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PAFAudioDecContext *c = avctx->priv_data;
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if (avctx->channels != 2) {
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av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
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return AVERROR_INVALIDDATA;
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}
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avcodec_get_frame_defaults(&c->frame);
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avctx->channel_layout = AV_CH_LAYOUT_STEREO;
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avctx->coded_frame = &c->frame;
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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return 0;
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}
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static int paf_aud_decode(AVCodecContext *avctx, void *data,
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int *got_frame_ptr, AVPacket *pkt)
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{
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PAFAudioDecContext *c = avctx->priv_data;
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uint8_t *buf = pkt->data;
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int16_t *output_samples;
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const uint8_t *t;
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int frames, ret, i, j, k;
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frames = pkt->size / PAF_SOUND_FRAME_SIZE;
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if (frames < 1)
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return AVERROR_INVALIDDATA;
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c->frame.nb_samples = PAF_SOUND_SAMPLES * frames;
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if ((ret = ff_get_buffer(avctx, &c->frame)) < 0)
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return ret;
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output_samples = (int16_t *)c->frame.data[0];
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for (i = 0; i < frames; i++) {
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t = buf + 256 * sizeof(uint16_t);
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for (j = 0; j < PAF_SOUND_SAMPLES; j++) {
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for (k = 0; k < 2; k++) {
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*output_samples++ = AV_RL16(buf + *t * 2);
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t++;
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}
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}
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buf += PAF_SOUND_FRAME_SIZE;
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}
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*got_frame_ptr = 1;
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*(AVFrame *)data = c->frame;
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return pkt->size;
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}
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AVCodec ff_paf_video_decoder = {
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.name = "paf_video",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PAF_VIDEO,
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.priv_data_size = sizeof(PAFVideoDecContext),
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.init = paf_vid_init,
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.close = paf_vid_close,
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.decode = paf_vid_decode,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"),
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};
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AVCodec ff_paf_audio_decoder = {
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.name = "paf_audio",
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_PAF_AUDIO,
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.priv_data_size = sizeof(PAFAudioDecContext),
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.init = paf_aud_init,
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.decode = paf_aud_decode,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"),
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};
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