From dc4e57489fa0f9cf4faf4c85cc405d6db77d84db Mon Sep 17 00:00:00 2001 From: Paul B Mahol Date: Tue, 14 Feb 2012 17:36:20 +0000 Subject: CDXL demuxer and decoder Signed-off-by: Paul B Mahol Signed-off-by: Diego Biurrun --- libavcodec/cdxl.c | 278 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 278 insertions(+) create mode 100644 libavcodec/cdxl.c (limited to 'libavcodec/cdxl.c') diff --git a/libavcodec/cdxl.c b/libavcodec/cdxl.c new file mode 100644 index 0000000000..a53a001ea4 --- /dev/null +++ b/libavcodec/cdxl.c @@ -0,0 +1,278 @@ +/* + * CDXL video decoder + * Copyright (c) 2011-2012 Paul B Mahol + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/intreadwrite.h" +#include "libavutil/imgutils.h" +#include "avcodec.h" +#include "get_bits.h" + +typedef struct { + AVCodecContext *avctx; + AVFrame frame; + int bpp; + 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; + + avcodec_get_frame_defaults(&c->frame); + 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], (r << 16) | (g << 8) | b); + } +} + +static void bitplanar2chunky(CDXLVideoContext *c, int width, + int linesize, uint8_t *out) +{ + GetBitContext gb; + int x, y, plane; + + init_get_bits(&gb, c->video, c->video_size * 8); + memset(out, 0, linesize * c->avctx->height); + for (plane = 0; plane < c->bpp; plane++) + for (y = 0; y < c->avctx->height; y++) + for (x = 0; x < width; x++) + out[linesize * y + x] |= get_bits1(&gb) << plane; +} + +static void cdxl_decode_rgb(CDXLVideoContext *c) +{ + uint32_t *new_palette = (uint32_t *)c->frame.data[1]; + int padded_width = FFALIGN(c->avctx->width, 16); + + import_palette(c, new_palette); + bitplanar2chunky(c, padded_width, c->frame.linesize[0], c->frame.data[0]); +} + +static void cdxl_decode_ham6(CDXLVideoContext *c) +{ + 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 = c->frame.data[0]; + + import_palette(c, new_palette); + bitplanar2chunky(c, avctx->width, 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_WN32(out + x * 3, r | g | b); + } + out += c->frame.linesize[0]; + } +} + +static void cdxl_decode_ham8(CDXLVideoContext *c) +{ + 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 = c->frame.data[0]; + + import_palette(c, new_palette); + bitplanar2chunky(c, avctx->width, 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_WN32(out + x * 3, r | g | b); + } + out += c->frame.linesize[0]; + } +} + +static int cdxl_decode_frame(AVCodecContext *avctx, void *data, + int *data_size, AVPacket *pkt) +{ + CDXLVideoContext *c = avctx->priv_data; + AVFrame * const p = &c->frame; + int ret, w, h, encoding, format, buf_size = pkt->size; + const uint8_t *buf = pkt->data; + + if (buf_size < 32) + return AVERROR_INVALIDDATA; + encoding = buf[1] & 7; + 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->bpp > 8) { + av_log_ask_for_sample(avctx, "unsupported pixel size: %d\n", c->bpp); + return AVERROR_PATCHWELCOME; + } + if (format) { + av_log_ask_for_sample(avctx, "unsupported pixel format: %d\n", format); + return AVERROR_PATCHWELCOME; + } + + if ((ret = av_image_check_size(w, h, 0, avctx)) < 0) + return ret; + if (w != avctx->width || h != avctx->height) + avcodec_set_dimensions(avctx, w, h); + + if (encoding == 0) { + if (c->video_size < FFALIGN(avctx->width, 16) * + avctx->height * c->bpp / 8) + return AVERROR_INVALIDDATA; + avctx->pix_fmt = PIX_FMT_PAL8; + } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) { + if (c->palette_size != (1 << (c->bpp - 1))) + return AVERROR_INVALIDDATA; + if (c->video_size < avctx->width * avctx->height * c->bpp / 8) + return AVERROR_INVALIDDATA; + avctx->pix_fmt = PIX_FMT_BGR24; + } else { + av_log_ask_for_sample(avctx, "unsupported encoding %d and bpp %d\n", + encoding, c->bpp); + return AVERROR_PATCHWELCOME; + } + + if (p->data[0]) + avctx->release_buffer(avctx, p); + + p->reference = 0; + if ((ret = avctx->get_buffer(avctx, p)) < 0) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return ret; + } + p->pict_type = AV_PICTURE_TYPE_I; + + if (encoding) { + av_fast_padded_malloc(&c->new_video, &c->new_video_size, + h * w + FF_INPUT_BUFFER_PADDING_SIZE); + if (!c->new_video) + return AVERROR(ENOMEM); + if (c->bpp == 8) + cdxl_decode_ham8(c); + else + cdxl_decode_ham6(c); + } else { + cdxl_decode_rgb(c); + } + *data_size = sizeof(AVFrame); + *(AVFrame*)data = c->frame; + + return buf_size; +} + +static av_cold int cdxl_decode_end(AVCodecContext *avctx) +{ + CDXLVideoContext *c = avctx->priv_data; + + av_free(c->new_video); + if (c->frame.data[0]) + avctx->release_buffer(avctx, &c->frame); + + return 0; +} + +AVCodec ff_cdxl_decoder = { + .name = "cdxl", + .type = AVMEDIA_TYPE_VIDEO, + .id = CODEC_ID_CDXL, + .priv_data_size = sizeof(CDXLVideoContext), + .init = cdxl_decode_init, + .close = cdxl_decode_end, + .decode = cdxl_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"), +}; -- cgit v1.2.3