338 lines
9.8 KiB
C
Executable File
338 lines
9.8 KiB
C
Executable File
/*
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* CDXL video decoder
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* Copyright (c) 2011-2012 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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/**
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* @file
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* Commodore CDXL video decoder
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* @author Paul B Mahol
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*/
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#define UNCHECKED_BITSTREAM_READER 1
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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "get_bits.h"
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#include "internal.h"
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#define BIT_PLANAR 0x00
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#define CHUNKY 0x20
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#define BYTE_PLANAR 0x40
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#define BIT_LINE 0x80
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#define BYTE_LINE 0xC0
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typedef struct CDXLVideoContext {
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AVCodecContext *avctx;
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int bpp;
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int format;
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int padded_bits;
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const uint8_t *palette;
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int palette_size;
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const uint8_t *video;
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int video_size;
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uint8_t *new_video;
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int new_video_size;
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} CDXLVideoContext;
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static av_cold int cdxl_decode_init(AVCodecContext *avctx)
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{
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CDXLVideoContext *c = avctx->priv_data;
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c->new_video_size = 0;
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c->avctx = avctx;
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return 0;
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}
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static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
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{
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int i;
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for (i = 0; i < c->palette_size / 2; i++) {
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unsigned rgb = AV_RB16(&c->palette[i * 2]);
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unsigned r = ((rgb >> 8) & 0xF) * 0x11;
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unsigned g = ((rgb >> 4) & 0xF) * 0x11;
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unsigned b = (rgb & 0xF) * 0x11;
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AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
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}
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}
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static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
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{
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GetBitContext gb;
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int x, y, plane;
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if (init_get_bits8(&gb, c->video, c->video_size) < 0)
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return;
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for (plane = 0; plane < c->bpp; plane++) {
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for (y = 0; y < c->avctx->height; y++) {
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for (x = 0; x < c->avctx->width; x++)
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out[linesize * y + x] |= get_bits1(&gb) << plane;
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skip_bits(&gb, c->padded_bits);
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}
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}
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}
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static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
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{
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GetBitContext gb;
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int x, y, plane;
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if (init_get_bits8(&gb, c->video, c->video_size) < 0)
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return;
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for (y = 0; y < c->avctx->height; y++) {
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for (plane = 0; plane < c->bpp; plane++) {
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for (x = 0; x < c->avctx->width; x++)
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out[linesize * y + x] |= get_bits1(&gb) << plane;
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skip_bits(&gb, c->padded_bits);
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}
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}
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}
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static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
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{
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GetByteContext gb;
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int y;
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bytestream2_init(&gb, c->video, c->video_size);
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for (y = 0; y < c->avctx->height; y++) {
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bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
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}
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}
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static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
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{
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memset(out, 0, linesize * c->avctx->height);
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switch (c->format) {
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case BIT_PLANAR:
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bitplanar2chunky(c, linesize, out);
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break;
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case BIT_LINE:
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bitline2chunky(c, linesize, out);
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break;
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case CHUNKY:
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chunky2chunky(c, linesize, out);
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break;
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}
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}
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static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
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{
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uint32_t *new_palette = (uint32_t *)frame->data[1];
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memset(frame->data[1], 0, AVPALETTE_SIZE);
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import_palette(c, new_palette);
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import_format(c, frame->linesize[0], frame->data[0]);
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}
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static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
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{
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import_format(c, frame->linesize[0], frame->data[0]);
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}
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static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
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{
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AVCodecContext *avctx = c->avctx;
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uint32_t new_palette[16], r, g, b;
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uint8_t *ptr, *out, index, op;
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int x, y;
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ptr = c->new_video;
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out = frame->data[0];
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import_palette(c, new_palette);
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import_format(c, avctx->width, c->new_video);
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for (y = 0; y < avctx->height; y++) {
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r = new_palette[0] & 0xFF0000;
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g = new_palette[0] & 0xFF00;
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b = new_palette[0] & 0xFF;
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for (x = 0; x < avctx->width; x++) {
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index = *ptr++;
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op = index >> 4;
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index &= 15;
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switch (op) {
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case 0:
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r = new_palette[index] & 0xFF0000;
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g = new_palette[index] & 0xFF00;
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b = new_palette[index] & 0xFF;
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break;
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case 1:
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b = index * 0x11;
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break;
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case 2:
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r = index * 0x11 << 16;
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break;
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case 3:
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g = index * 0x11 << 8;
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break;
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}
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AV_WL24(out + x * 3, r | g | b);
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}
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out += frame->linesize[0];
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}
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}
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static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
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{
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AVCodecContext *avctx = c->avctx;
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uint32_t new_palette[64], r, g, b;
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uint8_t *ptr, *out, index, op;
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int x, y;
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ptr = c->new_video;
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out = frame->data[0];
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import_palette(c, new_palette);
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import_format(c, avctx->width, c->new_video);
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for (y = 0; y < avctx->height; y++) {
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r = new_palette[0] & 0xFF0000;
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g = new_palette[0] & 0xFF00;
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b = new_palette[0] & 0xFF;
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for (x = 0; x < avctx->width; x++) {
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index = *ptr++;
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op = index >> 6;
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index &= 63;
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switch (op) {
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case 0:
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r = new_palette[index] & 0xFF0000;
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g = new_palette[index] & 0xFF00;
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b = new_palette[index] & 0xFF;
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break;
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case 1:
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b = (index << 2) | (b & 3);
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break;
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case 2:
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r = (index << 18) | (r & (3 << 16));
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break;
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case 3:
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g = (index << 10) | (g & (3 << 8));
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break;
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}
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AV_WL24(out + x * 3, r | g | b);
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}
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out += frame->linesize[0];
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}
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}
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static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *pkt)
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{
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CDXLVideoContext *c = avctx->priv_data;
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AVFrame * const p = data;
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int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
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const uint8_t *buf = pkt->data;
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if (buf_size < 32)
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return AVERROR_INVALIDDATA;
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encoding = buf[1] & 7;
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c->format = buf[1] & 0xE0;
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w = AV_RB16(&buf[14]);
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h = AV_RB16(&buf[16]);
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c->bpp = buf[19];
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c->palette_size = AV_RB16(&buf[20]);
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c->palette = buf + 32;
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c->video = c->palette + c->palette_size;
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c->video_size = buf_size - c->palette_size - 32;
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if (c->palette_size > 512)
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return AVERROR_INVALIDDATA;
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if (buf_size < c->palette_size + 32)
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return AVERROR_INVALIDDATA;
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if (c->bpp < 1)
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return AVERROR_INVALIDDATA;
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if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
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avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
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return AVERROR_PATCHWELCOME;
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}
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if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
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return ret;
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if (c->format == CHUNKY)
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aligned_width = avctx->width;
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else
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aligned_width = FFALIGN(c->avctx->width, 16);
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c->padded_bits = aligned_width - c->avctx->width;
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if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8)
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return AVERROR_INVALIDDATA;
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if (!encoding && c->palette_size && c->bpp <= 8 && c->format != CHUNKY) {
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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} else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8) && c->format != CHUNKY) {
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if (c->palette_size != (1 << (c->bpp - 1)))
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return AVERROR_INVALIDDATA;
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avctx->pix_fmt = AV_PIX_FMT_BGR24;
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} else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
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!c->palette_size) {
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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} else {
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avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
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encoding, c->bpp, c->format);
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return AVERROR_PATCHWELCOME;
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}
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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p->pict_type = AV_PICTURE_TYPE_I;
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if (encoding) {
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av_fast_padded_malloc(&c->new_video, &c->new_video_size,
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h * w + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!c->new_video)
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return AVERROR(ENOMEM);
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if (c->bpp == 8)
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cdxl_decode_ham8(c, p);
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else
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cdxl_decode_ham6(c, p);
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} else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
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cdxl_decode_rgb(c, p);
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} else {
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cdxl_decode_raw(c, p);
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}
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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 cdxl_decode_end(AVCodecContext *avctx)
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{
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CDXLVideoContext *c = avctx->priv_data;
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av_freep(&c->new_video);
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return 0;
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}
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AVCodec ff_cdxl_decoder = {
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.name = "cdxl",
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.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_CDXL,
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.priv_data_size = sizeof(CDXLVideoContext),
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.init = cdxl_decode_init,
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.close = cdxl_decode_end,
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.decode = cdxl_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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