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Fri, 26 Feb 2021 03:29:30 -0800 (PST) Received: from localhost.localdomain ([109.227.52.18]) by smtp.gmail.com with ESMTPSA id t8sm5348817edv.16.2021.02.26.03.29.29 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 03:29:30 -0800 (PST) From: Paul B Mahol To: ffmpeg-devel@ffmpeg.org Date: Fri, 26 Feb 2021 12:29:18 +0100 Message-Id: <20210226112919.20437-2-onemda@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210226112919.20437-1-onemda@gmail.com> References: <20210226112919.20437-1-onemda@gmail.com> Subject: [FFmpeg-devel] [PATCH 2/3] avcodec: add SGA Video decoder X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Signed-off-by: Paul B Mahol --- libavcodec/Makefile | 1 + libavcodec/allcodecs.c | 1 + libavcodec/codec_desc.c | 7 + libavcodec/codec_id.h | 1 + libavcodec/sga.c | 534 ++++++++++++++++++++++++++++++++++++++++ 5 files changed, 544 insertions(+) create mode 100644 libavcodec/sga.c diff --git a/libavcodec/Makefile b/libavcodec/Makefile index fe7026c1db..850657ae3c 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -609,6 +609,7 @@ OBJS-$(CONFIG_SANM_DECODER) += sanm.o OBJS-$(CONFIG_SCPR_DECODER) += scpr.o OBJS-$(CONFIG_SCREENPRESSO_DECODER) += screenpresso.o OBJS-$(CONFIG_SDX2_DPCM_DECODER) += dpcm.o +OBJS-$(CONFIG_SGA_DECODER) += sga.o OBJS-$(CONFIG_SGI_DECODER) += sgidec.o OBJS-$(CONFIG_SGI_ENCODER) += sgienc.o rle.o OBJS-$(CONFIG_SGIRLE_DECODER) += sgirledec.o diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index 990998b64b..a04faead16 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -289,6 +289,7 @@ extern AVCodec ff_s302m_decoder; extern AVCodec ff_sanm_decoder; extern AVCodec ff_scpr_decoder; extern AVCodec ff_screenpresso_decoder; +extern AVCodec ff_sga_decoder; extern AVCodec ff_sgi_encoder; extern AVCodec ff_sgi_decoder; extern AVCodec ff_sgirle_decoder; diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c index f64ba488f2..17f8a14044 100644 --- a/libavcodec/codec_desc.c +++ b/libavcodec/codec_desc.c @@ -1849,6 +1849,13 @@ static const AVCodecDescriptor codec_descriptors[] = { .long_name = NULL_IF_CONFIG_SMALL("Simbiosis Interactive IMX Video"), .props = AV_CODEC_PROP_LOSSY, }, + { + .id = AV_CODEC_ID_SGA_VIDEO, + .type = AVMEDIA_TYPE_VIDEO, + .name = "sga", + .long_name = NULL_IF_CONFIG_SMALL("Digital Pictures SGA Video"), + .props = AV_CODEC_PROP_LOSSY, + }, /* various PCM "codecs" */ { diff --git a/libavcodec/codec_id.h b/libavcodec/codec_id.h index 7dd316afd2..ab7bc68ee2 100644 --- a/libavcodec/codec_id.h +++ b/libavcodec/codec_id.h @@ -306,6 +306,7 @@ enum AVCodecID { AV_CODEC_ID_ARGO, AV_CODEC_ID_CRI, AV_CODEC_ID_SIMBIOSIS_IMX, + AV_CODEC_ID_SGA_VIDEO, /* various PCM "codecs" */ AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs diff --git a/libavcodec/sga.c b/libavcodec/sga.c new file mode 100644 index 0000000000..00752a5843 --- /dev/null +++ b/libavcodec/sga.c @@ -0,0 +1,534 @@ +/* + * Copyright (c) 2021 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 + */ + +#include "libavutil/avassert.h" +#include "libavutil/common.h" +#include "avcodec.h" +#include "get_bits.h" +#include "bytestream.h" +#include "internal.h" + +#define PALDATA_FOLLOWS_TILEDATA 4 +#define HAVE_COMPRESSED_TILEMAP 32 +#define HAVE_TILEMAP 128 + +typedef struct SGAVideoContext { + GetByteContext gb; + + int metadata_size; + int tiledata_size; + int tiledata_offset; + int tilemapdata_size; + int tilemapdata_offset; + int paldata_size; + int paldata_offset; + int palmapdata_offset; + int palmapdata_size; + + int flags; + int nb_pal; + int nb_tiles; + int tiles_w, tiles_h; + int shift; + int plus; + int swap; + + uint32_t pal[256]; + uint8_t *tileindex_data; + unsigned tileindex_size; + uint8_t *palmapindex_data; + unsigned palmapindex_size; + uint8_t uncompressed[65536]; +} SGAVideoContext; + +static av_cold int sga_decode_init(AVCodecContext *avctx) +{ + avctx->pix_fmt = AV_PIX_FMT_PAL8; + return 0; +} + +static int decode_palette(GetByteContext *gb, uint32_t *pal) +{ + GetBitContext gbit; + + if (bytestream2_get_bytes_left(gb) < 18) + return AVERROR_INVALIDDATA; + + memset(pal, 0, 16 * sizeof(*pal)); + init_get_bits8(&gbit, gb->buffer, 18); + + for (int RGBIndex = 0; RGBIndex < 3; RGBIndex++) { + for (int index = 0; index < 16; index++) { + unsigned color = get_bits1(&gbit) << RGBIndex; + pal[15 - index] |= color << (5 + 16); + } + } + + for (int RGBIndex = 0; RGBIndex < 3; RGBIndex++) { + for (int index = 0; index < 16; index++) { + unsigned color = get_bits1(&gbit) << RGBIndex; + pal[15 - index] |= color << (5 + 8); + } + } + + for (int RGBIndex = 0; RGBIndex < 3; RGBIndex++) { + for (int index = 0; index < 16; index++) { + unsigned color = get_bits1(&gbit) << RGBIndex; + pal[15 - index] |= color << (5 + 0); + } + } + + for (int index = 0; index < 16; index++) + pal[index] = (0xFFU << 24) | pal[index] | (pal[index] >> 3); + + bytestream2_skip(gb, 18); + + return 0; +} + +static int decode_index_palmap(SGAVideoContext *s, AVFrame *frame) +{ + const uint8_t *tt = s->tileindex_data; + + for (int y = 0; y < s->tiles_h; y++) { + for (int x = 0; x < s->tiles_w; x++) { + int pal_idx = s->palmapindex_data[y * s->tiles_w + x] * 16; + uint8_t *dst = frame->data[0] + y * 8 * frame->linesize[0] + x * 8; + + for (int yy = 0; yy < 8; yy++) { + for (int xx = 0; xx < 8; xx++) + dst[xx] = pal_idx + tt[xx]; + tt += 8; + + dst += frame->linesize[0]; + } + } + } + + return 0; +} + +static int decode_index_tilemap(SGAVideoContext *s, AVFrame *frame) +{ + GetByteContext *gb = &s->gb; + GetBitContext pm; + + bytestream2_seek(gb, s->tilemapdata_offset, SEEK_SET); + if (bytestream2_get_bytes_left(gb) < s->tilemapdata_size) + return AVERROR_INVALIDDATA; + + init_get_bits8(&pm, gb->buffer, s->tilemapdata_size); + + for (int y = 0; y < s->tiles_h; y++) { + for (int x = 0; x < s->tiles_w; x++) { + uint8_t tile[64]; + int tilemap = get_bits(&pm, 16); + int flip_x = (tilemap >> 11) & 1; + int flip_y = (tilemap >> 12) & 1; + int tindex = av_clip((tilemap & 511) - 1, 0, s->nb_tiles - 1); + const uint8_t *tt = s->tileindex_data + tindex * 64; + int pal_idx = ((tilemap >> 13) & 3) * 16; + uint8_t *dst = frame->data[0] + y * 8 * frame->linesize[0] + x * 8; + + if (!flip_x && !flip_y) { + memcpy(tile, tt, 64); + } else if (flip_x && flip_y) { + for (int i = 0; i < 8; i++) { + for (int j = 0; j < 8; j++) + tile[i * 8 + j] = tt[(7 - i) * 8 + 7 - j]; + } + } else if (flip_x) { + for (int i = 0; i < 8; i++) { + for (int j = 0; j < 8; j++) + tile[i * 8 + j] = tt[i * 8 + 7 - j]; + } + } else { + for (int i = 0; i < 8; i++) { + for (int j = 0; j < 8; j++) + tile[i * 8 + j] = tt[(7 - i) * 8 + j]; + } + } + + for (int yy = 0; yy < 8; yy++) { + for (int xx = 0; xx < 8; xx++) + dst[xx] = pal_idx + tile[xx + yy * 8]; + + dst += frame->linesize[0]; + } + } + } + + return 0; +} + +static int decode_index(SGAVideoContext *s, AVFrame *frame) +{ + const uint8_t *src = s->tileindex_data; + uint8_t *dst = frame->data[0]; + + for (int y = 0; y < frame->height; y += 8) { + for (int x = 0; x < frame->width; x += 8) { + for (int yy = 0; yy < 8; yy++) { + for (int xx = 0; xx < 8; xx++) + dst[x + xx + yy * frame->linesize[0]] = src[xx]; + src += 8; + } + } + + dst += 8 * frame->linesize[0]; + } + + return 0; +} + +static int lzss_decompress(AVCodecContext *avctx, + GetByteContext *gb, uint8_t *dst, + int dst_size, int shift, int plus) +{ + int oi = 0; + + while (bytestream2_get_bytes_left(gb) > 0 && oi < dst_size) { + uint16_t displace, header = bytestream2_get_be16(gb); + int count, offset; + + for (int i = 0; i < 16; i++) { + switch (header >> 15) { + case 0: + if (oi + 2 < dst_size) { + dst[oi++] = bytestream2_get_byte(gb); + dst[oi++] = bytestream2_get_byte(gb); + } + break; + case 1: + displace = bytestream2_get_be16(gb); + count = displace >> shift; + offset = displace & ((1 << shift) - 1); + + if (displace == 0) { + while (bytestream2_get_bytes_left(gb) > 0 && + oi < dst_size) + dst[oi++] = bytestream2_get_byte(gb); + return oi; + } + + count += plus; + + if (offset <= 0) + offset = 1; + if (oi < offset) + return AVERROR_INVALIDDATA; + for (int j = 0; j < count * 2; j++) { + dst[oi] = dst[oi - offset]; + oi++; + } + break; + } + + header <<= 1; + } + } + + return AVERROR_INVALIDDATA; +} + +static int decode_palmapdata(AVCodecContext *avctx) +{ + SGAVideoContext *s = avctx->priv_data; + const int bits = (s->nb_pal + 1) / 2; + GetByteContext *gb = &s->gb; + GetBitContext pm; + + bytestream2_seek(gb, s->palmapdata_offset, SEEK_SET); + if (bytestream2_get_bytes_left(gb) < s->palmapdata_size) + return AVERROR_INVALIDDATA; + init_get_bits8(&pm, gb->buffer, s->palmapdata_size); + + for (int y = 0; y < s->tiles_h; y++) { + uint8_t *dst = s->palmapindex_data + y * s->tiles_w; + + for (int x = 0; x < s->tiles_w; x++) + dst[x] = get_bits(&pm, bits); + + dst += s->tiles_w; + } + + return 0; +} + +static int decode_tiledata(AVCodecContext *avctx) +{ + SGAVideoContext *s = avctx->priv_data; + GetByteContext *gb = &s->gb; + GetBitContext tm; + + bytestream2_seek(gb, s->tiledata_offset, SEEK_SET); + if (bytestream2_get_bytes_left(gb) < s->tiledata_size) + return AVERROR_INVALIDDATA; + init_get_bits8(&tm, gb->buffer, s->tiledata_size); + + for (int n = 0; n < s->nb_tiles; n++) { + uint8_t *dst = s->tileindex_data + n * 64; + + for (int yy = 0; yy < 8; yy++) { + for (int xx = 0; xx < 8; xx++) + dst[xx] = get_bits(&tm, 4); + + dst += 8; + } + } + + for (int i = 0; i < s->nb_tiles && s->swap; i++) { + uint8_t *dst = s->tileindex_data + i * 64; + + for (int j = 8; j < 64; j += 16) { + for (int k = 0; k < 8; k += 2) + FFSWAP(uint8_t, dst[j + k], dst[j+k+1]); + } + } + + return 0; +} + +static int sga_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame, AVPacket *avpkt) +{ + SGAVideoContext *s = avctx->priv_data; + GetByteContext *gb = &s->gb; + AVFrame *frame = data; + int ret, type; + + if (avpkt->size <= 14) + return AVERROR_INVALIDDATA; + + s->flags = avpkt->data[8]; + s->nb_pal = avpkt->data[9]; + s->tiles_w = avpkt->data[10]; + s->tiles_h = avpkt->data[11]; + + if (s->nb_pal > 4) + return AVERROR_INVALIDDATA; + + if ((ret = ff_set_dimensions(avctx, + s->tiles_w * 8, + s->tiles_h * 8)) < 0) + return ret; + + av_fast_padded_malloc(&s->tileindex_data, &s->tileindex_size, + avctx->width * avctx->height); + if (!s->tileindex_data) + return AVERROR(ENOMEM); + + av_fast_padded_malloc(&s->palmapindex_data, &s->palmapindex_size, + s->tiles_w * s->tiles_h); + if (!s->palmapindex_data) + return AVERROR(ENOMEM); + + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) + return ret; + + bytestream2_init(gb, avpkt->data, avpkt->size); + + type = bytestream2_get_byte(gb); + s->metadata_size = 12 + ((!!(s->flags & HAVE_TILEMAP)) * 2); + s->nb_tiles = s->flags & HAVE_TILEMAP ? AV_RB16(avpkt->data + 12) : s->tiles_w * s->tiles_h; + if (s->nb_tiles > s->tiles_w * s->tiles_h) + return AVERROR_INVALIDDATA; + + av_log(avctx, AV_LOG_DEBUG, "type: %X flags: %X nb_tiles: %d\n", type, s->flags, s->nb_tiles); + + switch (type) { + case 0xE7: + case 0xCB: + case 0xCD: + s->swap = 1; + s->shift = 12; + s->plus = 1; + break; + case 0xC9: + s->swap = 1; + s->shift = 13; + s->plus = 1; + break; + case 0xC8: + s->swap = 1; + s->shift = 13; + s->plus = 0; + break; + case 0xC7: + s->swap = 0; + s->shift = 13; + s->plus = 1; + break; + case 0xC6: + s->swap = 0; + s->shift = 13; + s->plus = 0; + break; + } + + if (type == 0xE7) { + int offset = s->metadata_size, left; + int sizes[3]; + + bytestream2_seek(gb, s->metadata_size, SEEK_SET); + + for (int i = 0; i < 3; i++) + sizes[i] = bytestream2_get_be16(gb); + + for (int i = 0; i < 3; i++) { + int size = sizes[i]; + int raw = size >> 15; + + size &= (1 << 15) - 1; + + if (raw) { + if (bytestream2_get_bytes_left(gb) < size) + return AVERROR_INVALIDDATA; + + if (sizeof(s->uncompressed) - offset < size) + return AVERROR_INVALIDDATA; + + memcpy(s->uncompressed + offset, gb->buffer, size); + bytestream2_skip(gb, size); + } else { + GetByteContext gb2; + + if (bytestream2_get_bytes_left(gb) < size) + return AVERROR_INVALIDDATA; + + bytestream2_init(&gb2, gb->buffer, size); + ret = lzss_decompress(avctx, &gb2, s->uncompressed + offset, + sizeof(s->uncompressed) - offset, s->shift, s->plus); + if (ret < 0) + return ret; + bytestream2_skip(gb, size); + size = ret; + } + + offset += size; + } + + left = bytestream2_get_bytes_left(gb); + if (sizeof(s->uncompressed) - offset < left) + return AVERROR_INVALIDDATA; + + bytestream2_get_buffer(gb, s->uncompressed + offset, left); + + offset += left; + bytestream2_init(gb, s->uncompressed, offset); + } + + switch (type) { + case 0xCD: + case 0xCB: + case 0xC9: + case 0xC8: + case 0xC7: + case 0xC6: + bytestream2_seek(gb, s->metadata_size, SEEK_SET); + ret = lzss_decompress(avctx, gb, s->uncompressed + s->metadata_size, + sizeof(s->uncompressed) - s->metadata_size, s->shift, s->plus); + if (ret < 0) + return ret; + bytestream2_init(gb, s->uncompressed, ret + s->metadata_size); + case 0xE7: + case 0xC1: + s->tiledata_size = s->nb_tiles * 32; + s->paldata_size = s->nb_pal * 18; + s->tiledata_offset = s->flags & PALDATA_FOLLOWS_TILEDATA ? s->metadata_size : s->metadata_size + s->paldata_size; + s->paldata_offset = s->flags & PALDATA_FOLLOWS_TILEDATA ? s->metadata_size + s->tiledata_size : s->metadata_size; + s->palmapdata_offset = (s->flags & HAVE_TILEMAP) ? -1 : s->paldata_offset + s->paldata_size; + s->palmapdata_size = (s->flags & HAVE_TILEMAP) || s->nb_pal < 2 ? 0 : (s->tiles_w * s->tiles_h * ((s->nb_pal + 1) / 2) + 7) / 8; + s->tilemapdata_size = (s->flags & HAVE_TILEMAP) ? s->tiles_w * s->tiles_h * 2 : 0; + s->tilemapdata_offset = (s->flags & HAVE_TILEMAP) ? s->paldata_offset + s->paldata_size: -1; + + bytestream2_seek(gb, s->paldata_offset, SEEK_SET); + for (int n = 0; n < s->nb_pal; n++) { + ret = decode_palette(gb, s->pal + 16 * n); + if (ret < 0) + return ret; + } + + if (s->tiledata_size > 0) { + ret = decode_tiledata(avctx); + if (ret < 0) + return ret; + } + + if (s->palmapdata_size > 0) { + ret = decode_palmapdata(avctx); + if (ret < 0) + return ret; + } + + if (s->palmapdata_size > 0 && s->tiledata_size > 0) { + ret = decode_index_palmap(s, frame); + if (ret < 0) + return ret; + } else if (s->tilemapdata_size > 0 && s->tiledata_size > 0) { + ret = decode_index_tilemap(s, frame); + if (ret < 0) + return ret; + } else if (s->tiledata_size > 0) { + ret = decode_index(s, frame); + if (ret < 0) + return ret; + } + break; + default: + av_log(avctx, AV_LOG_ERROR, "Unknown type: %X\n", type); + return AVERROR_INVALIDDATA; + } + + memcpy(frame->data[1], s->pal, AVPALETTE_SIZE); + frame->palette_has_changed = 1; + frame->pict_type = AV_PICTURE_TYPE_I; + frame->key_frame = 1; + + *got_frame = 1; + + return avpkt->size; +} + +static av_cold int sga_decode_end(AVCodecContext *avctx) +{ + SGAVideoContext *s = avctx->priv_data; + + av_freep(&s->tileindex_data); + s->tileindex_size = 0; + + av_freep(&s->palmapindex_data); + s->palmapindex_size = 0; + + return 0; +} + +AVCodec ff_sga_decoder = { + .name = "sga", + .long_name = NULL_IF_CONFIG_SMALL("Digital Pictures SGA Video"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_SGA_VIDEO, + .priv_data_size = sizeof(SGAVideoContext), + .init = sga_decode_init, + .decode = sga_decode_frame, + .close = sga_decode_end, + .capabilities = AV_CODEC_CAP_DR1, + .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, +};