/* * CDXL video decoder * Copyright (c) 2011-2012 Paul B Mahol * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Commodore CDXL video decoder * @author Paul B Mahol */ #define UNCHECKED_BITSTREAM_READER 1 #include "libavutil/intreadwrite.h" #include "libavutil/imgutils.h" #include "avcodec.h" #include "bytestream.h" #include "get_bits.h" #include "internal.h" #define BIT_PLANAR 0x00 #define CHUNKY 0x20 #define BYTE_PLANAR 0x40 #define BIT_LINE 0x80 #define BYTE_LINE 0xC0 typedef struct CDXLVideoContext { AVCodecContext *avctx; int bpp; int format; int padded_bits; const uint8_t *palette; int palette_size; const uint8_t *video; int video_size; uint8_t *new_video; int new_video_size; } CDXLVideoContext; static av_cold int cdxl_decode_init(AVCodecContext *avctx) { CDXLVideoContext *c = avctx->priv_data; c->new_video_size = 0; c->avctx = avctx; return 0; } static void import_palette(CDXLVideoContext *c, uint32_t *new_palette) { int i; for (i = 0; i < c->palette_size / 2; i++) { unsigned rgb = AV_RB16(&c->palette[i * 2]); unsigned r = ((rgb >> 8) & 0xF) * 0x11; unsigned g = ((rgb >> 4) & 0xF) * 0x11; unsigned b = (rgb & 0xF) * 0x11; AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b); } } static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out) { GetBitContext gb; int x, y, plane; if (init_get_bits8(&gb, c->video, c->video_size) < 0) return; for (plane = 0; plane < c->bpp; plane++) { for (y = 0; y < c->avctx->height; y++) { for (x = 0; x < c->avctx->width; x++) out[linesize * y + x] |= get_bits1(&gb) << plane; skip_bits(&gb, c->padded_bits); } } } static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out) { GetBitContext gb; int x, y, plane; if (init_get_bits8(&gb, c->video, c->video_size) < 0) return; for (y = 0; y < c->avctx->height; y++) { for (plane = 0; plane < c->bpp; plane++) { for (x = 0; x < c->avctx->width; x++) out[linesize * y + x] |= get_bits1(&gb) << plane; skip_bits(&gb, c->padded_bits); } } } static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out) { GetByteContext gb; int y; bytestream2_init(&gb, c->video, c->video_size); for (y = 0; y < c->avctx->height; y++) { bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3); } } static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out) { memset(out, 0, linesize * c->avctx->height); switch (c->format) { case BIT_PLANAR: bitplanar2chunky(c, linesize, out); break; case BIT_LINE: bitline2chunky(c, linesize, out); break; case CHUNKY: chunky2chunky(c, linesize, out); break; } } static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame) { uint32_t *new_palette = (uint32_t *)frame->data[1]; memset(frame->data[1], 0, AVPALETTE_SIZE); import_palette(c, new_palette); import_format(c, frame->linesize[0], frame->data[0]); } static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame) { import_format(c, frame->linesize[0], frame->data[0]); } static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame) { AVCodecContext *avctx = c->avctx; uint32_t new_palette[16], r, g, b; uint8_t *ptr, *out, index, op; int x, y; ptr = c->new_video; out = frame->data[0]; import_palette(c, new_palette); import_format(c, avctx->width, c->new_video); for (y = 0; y < avctx->height; y++) { r = new_palette[0] & 0xFF0000; g = new_palette[0] & 0xFF00; b = new_palette[0] & 0xFF; for (x = 0; x < avctx->width; x++) { index = *ptr++; op = index >> 4; index &= 15; switch (op) { case 0: r = new_palette[index] & 0xFF0000; g = new_palette[index] & 0xFF00; b = new_palette[index] & 0xFF; break; case 1: b = index * 0x11; break; case 2: r = index * 0x11 << 16; break; case 3: g = index * 0x11 << 8; break; } AV_WL24(out + x * 3, r | g | b); } out += frame->linesize[0]; } } static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame) { AVCodecContext *avctx = c->avctx; uint32_t new_palette[64], r, g, b; uint8_t *ptr, *out, index, op; int x, y; ptr = c->new_video; out = frame->data[0]; import_palette(c, new_palette); import_format(c, avctx->width, c->new_video); for (y = 0; y < avctx->height; y++) { r = new_palette[0] & 0xFF0000; g = new_palette[0] & 0xFF00; b = new_palette[0] & 0xFF; for (x = 0; x < avctx->width; x++) { index = *ptr++; op = index >> 6; index &= 63; switch (op) { case 0: r = new_palette[index] & 0xFF0000; g = new_palette[index] & 0xFF00; b = new_palette[index] & 0xFF; break; case 1: b = (index << 2) | (b & 3); break; case 2: r = (index << 18) | (r & (3 << 16)); break; case 3: g = (index << 10) | (g & (3 << 8)); break; } AV_WL24(out + x * 3, r | g | b); } out += frame->linesize[0]; } } static int cdxl_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *pkt) { CDXLVideoContext *c = avctx->priv_data; AVFrame * const p = data; int ret, w, h, encoding, aligned_width, buf_size = pkt->size; const uint8_t *buf = pkt->data; if (buf_size < 32) return AVERROR_INVALIDDATA; encoding = buf[1] & 7; c->format = buf[1] & 0xE0; w = AV_RB16(&buf[14]); h = AV_RB16(&buf[16]); c->bpp = buf[19]; c->palette_size = AV_RB16(&buf[20]); c->palette = buf + 32; c->video = c->palette + c->palette_size; c->video_size = buf_size - c->palette_size - 32; if (c->palette_size > 512) return AVERROR_INVALIDDATA; if (buf_size < c->palette_size + 32) return AVERROR_INVALIDDATA; if (c->bpp < 1) return AVERROR_INVALIDDATA; if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) { avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format); return AVERROR_PATCHWELCOME; } if ((ret = ff_set_dimensions(avctx, w, h)) < 0) return ret; if (c->format == CHUNKY) aligned_width = avctx->width; else aligned_width = FFALIGN(c->avctx->width, 16); c->padded_bits = aligned_width - c->avctx->width; if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8) return AVERROR_INVALIDDATA; if (!encoding && c->palette_size && c->bpp <= 8) { avctx->pix_fmt = AV_PIX_FMT_PAL8; } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) { if (c->palette_size != (1 << (c->bpp - 1))) return AVERROR_INVALIDDATA; avctx->pix_fmt = AV_PIX_FMT_BGR24; } else if (!encoding && c->bpp == 24 && c->format == CHUNKY && !c->palette_size) { avctx->pix_fmt = AV_PIX_FMT_RGB24; } else { avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x", encoding, c->bpp, c->format); return AVERROR_PATCHWELCOME; } if ((ret = ff_get_buffer(avctx, p, 0)) < 0) return ret; p->pict_type = AV_PICTURE_TYPE_I; if (encoding) { av_fast_padded_malloc(&c->new_video, &c->new_video_size, h * w + AV_INPUT_BUFFER_PADDING_SIZE); if (!c->new_video) return AVERROR(ENOMEM); if (c->bpp == 8) cdxl_decode_ham8(c, p); else cdxl_decode_ham6(c, p); } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { cdxl_decode_rgb(c, p); } else { cdxl_decode_raw(c, p); } *got_frame = 1; return buf_size; } static av_cold int cdxl_decode_end(AVCodecContext *avctx) { CDXLVideoContext *c = avctx->priv_data; av_freep(&c->new_video); return 0; } AVCodec ff_cdxl_decoder = { .name = "cdxl", .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_CDXL, .priv_data_size = sizeof(CDXLVideoContext), .init = cdxl_decode_init, .close = cdxl_decode_end, .decode = cdxl_decode_frame, .capabilities = AV_CODEC_CAP_DR1, };