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b5c626fdf3
Width is padded for ham encodings too. Signed-off-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
278 lines
8.1 KiB
C
278 lines
8.1 KiB
C
/*
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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 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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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "get_bits.h"
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typedef struct {
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AVCodecContext *avctx;
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AVFrame frame;
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int bpp;
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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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avcodec_get_frame_defaults(&c->frame);
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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], (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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int skip = FFALIGN(c->avctx->width, 16) - c->avctx->width;
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GetBitContext gb;
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int x, y, plane;
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init_get_bits(&gb, c->video, c->video_size * 8);
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memset(out, 0, linesize * c->avctx->height);
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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, skip);
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}
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}
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}
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static void cdxl_decode_rgb(CDXLVideoContext *c)
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{
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uint32_t *new_palette = (uint32_t *)c->frame.data[1];
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import_palette(c, new_palette);
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bitplanar2chunky(c, c->frame.linesize[0], c->frame.data[0]);
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}
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static void cdxl_decode_ham6(CDXLVideoContext *c)
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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 = c->frame.data[0];
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import_palette(c, new_palette);
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bitplanar2chunky(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_WN32(out + x * 3, r | g | b);
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}
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out += c->frame.linesize[0];
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}
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}
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static void cdxl_decode_ham8(CDXLVideoContext *c)
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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 = c->frame.data[0];
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import_palette(c, new_palette);
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bitplanar2chunky(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_WN32(out + x * 3, r | g | b);
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}
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out += c->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 *data_size, AVPacket *pkt)
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{
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CDXLVideoContext *c = avctx->priv_data;
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AVFrame * const p = &c->frame;
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int ret, w, h, encoding, format, 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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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->bpp > 8) {
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av_log_ask_for_sample(avctx, "unsupported pixel size: %d\n", c->bpp);
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return AVERROR_PATCHWELCOME;
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}
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if (format) {
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av_log_ask_for_sample(avctx, "unsupported pixel format: %d\n", format);
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return AVERROR_PATCHWELCOME;
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}
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if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
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return ret;
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if (w != avctx->width || h != avctx->height)
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avcodec_set_dimensions(avctx, w, h);
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if (c->video_size < FFALIGN(avctx->width, 16) * avctx->height * c->bpp / 8)
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return AVERROR_INVALIDDATA;
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if (encoding == 0) {
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avctx->pix_fmt = PIX_FMT_PAL8;
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} else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
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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 = PIX_FMT_BGR24;
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} else {
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av_log_ask_for_sample(avctx, "unsupported encoding %d and bpp %d\n",
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encoding, c->bpp);
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return AVERROR_PATCHWELCOME;
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}
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if (p->data[0])
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avctx->release_buffer(avctx, p);
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p->reference = 0;
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if ((ret = avctx->get_buffer(avctx, p)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return ret;
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}
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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 + FF_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);
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else
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cdxl_decode_ham6(c);
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} else {
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cdxl_decode_rgb(c);
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = c->frame;
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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_free(c->new_video);
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if (c->frame.data[0])
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avctx->release_buffer(avctx, &c->frame);
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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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.type = AVMEDIA_TYPE_VIDEO,
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.id = 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 = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
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};
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