/* * Cryo Interactive Entertainment HNM4 video decoder * * Copyright (c) 2012 David Kment * * 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 <string.h> #include "libavutil/imgutils.h" #include "libavutil/internal.h" #include "libavutil/intreadwrite.h" #include "libavutil/mem.h" #include "avcodec.h" #include "bytestream.h" #include "internal.h" #define HNM4_CHUNK_ID_PL 19536 #define HNM4_CHUNK_ID_IZ 23113 #define HNM4_CHUNK_ID_IU 21833 #define HNM4_CHUNK_ID_SD 17491 typedef struct Hnm4VideoContext { uint8_t version; int width; int height; uint8_t *current; uint8_t *previous; uint8_t *buffer1; uint8_t *buffer2; uint8_t *processed; uint32_t palette[256]; } Hnm4VideoContext; static int getbit(GetByteContext *gb, uint32_t *bitbuf, int *bits) { int ret; if (!*bits) { *bitbuf = bytestream2_get_le32(gb); *bits = 32; } ret = *bitbuf >> 31; *bitbuf <<= 1; (*bits)--; return ret; } static void unpack_intraframe(AVCodecContext *avctx, uint8_t *src, uint32_t size) { Hnm4VideoContext *hnm = avctx->priv_data; GetByteContext gb; uint32_t bitbuf = 0, writeoffset = 0, count = 0; uint16_t word; int32_t offset; int bits = 0; bytestream2_init(&gb, src, size); while (bytestream2_tell(&gb) < size) { if (getbit(&gb, &bitbuf, &bits)) { if (writeoffset >= hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "Attempting to write out of bounds\n"); break; } hnm->current[writeoffset++] = bytestream2_get_byte(&gb); } else { if (getbit(&gb, &bitbuf, &bits)) { word = bytestream2_get_le16(&gb); count = word & 0x07; offset = (word >> 3) - 0x2000; if (!count) count = bytestream2_get_byte(&gb); if (!count) return; } else { count = getbit(&gb, &bitbuf, &bits) * 2; count += getbit(&gb, &bitbuf, &bits); offset = bytestream2_get_byte(&gb) - 0x0100; } count += 2; offset += writeoffset; if (offset < 0 || offset + count >= hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n"); break; } else if (writeoffset + count >= hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "Attempting to write out of bounds\n"); break; } while (count--) { hnm->current[writeoffset++] = hnm->current[offset++]; } } } } static void postprocess_current_frame(AVCodecContext *avctx) { Hnm4VideoContext *hnm = avctx->priv_data; uint32_t x, y, src_x, src_y; for (y = 0; y < hnm->height; y++) { src_y = y - (y % 2); src_x = src_y * hnm->width + (y % 2); for (x = 0; x < hnm->width; x++) { hnm->processed[(y * hnm->width) + x] = hnm->current[src_x]; src_x += 2; } } } static void copy_processed_frame(AVCodecContext *avctx, AVFrame *frame) { Hnm4VideoContext *hnm = avctx->priv_data; uint8_t *src = hnm->processed; uint8_t *dst = frame->data[0]; int y; for (y = 0; y < hnm->height; y++) { memcpy(dst, src, hnm->width); src += hnm->width; dst += frame->linesize[0]; } } static void decode_interframe_v4(AVCodecContext *avctx, uint8_t *src, uint32_t size) { Hnm4VideoContext *hnm = avctx->priv_data; GetByteContext gb; uint32_t writeoffset = 0; int count, left, offset; uint8_t tag, previous, backline, backward, swap; bytestream2_init(&gb, src, size); while (bytestream2_tell(&gb) < size) { count = bytestream2_peek_byte(&gb) & 0x1F; if (count == 0) { tag = bytestream2_get_byte(&gb) & 0xE0; tag = tag >> 5; if (tag == 0) { if (writeoffset + 2 > hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n"); break; } hnm->current[writeoffset++] = bytestream2_get_byte(&gb); hnm->current[writeoffset++] = bytestream2_get_byte(&gb); } else if (tag == 1) { writeoffset += bytestream2_get_byte(&gb) * 2; } else if (tag == 2) { count = bytestream2_get_le16(&gb); count *= 2; writeoffset += count; } else if (tag == 3) { count = bytestream2_get_byte(&gb) * 2; if (writeoffset + count > hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n"); break; } while (count > 0) { hnm->current[writeoffset++] = bytestream2_peek_byte(&gb); count--; } bytestream2_skip(&gb, 1); } else { break; } if (writeoffset > hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n"); break; } } else { previous = bytestream2_peek_byte(&gb) & 0x20; backline = bytestream2_peek_byte(&gb) & 0x40; backward = bytestream2_peek_byte(&gb) & 0x80; bytestream2_skip(&gb, 1); swap = bytestream2_peek_byte(&gb) & 0x01; offset = bytestream2_get_le16(&gb); offset = (offset >> 1) & 0x7FFF; offset = writeoffset + (offset * 2) - 0x8000; left = count; if (!backward && offset + 2*count > hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n"); break; } else if (backward && offset + 1 >= hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n"); break; } else if (writeoffset + 2*count > hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "Attempting to write out of bounds\n"); break; } if(backward) { if (offset < (!!backline)*(2 * hnm->width - 1) + 2*(left-1)) { av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n"); break; } } else { if (offset < (!!backline)*(2 * hnm->width - 1)) { av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n"); break; } } if (previous) { while (left > 0) { if (backline) { hnm->current[writeoffset++] = hnm->previous[offset - (2 * hnm->width) + 1]; hnm->current[writeoffset++] = hnm->previous[offset++]; offset++; } else { hnm->current[writeoffset++] = hnm->previous[offset++]; hnm->current[writeoffset++] = hnm->previous[offset++]; } if (backward) offset -= 4; left--; } } else { while (left > 0) { if (backline) { hnm->current[writeoffset++] = hnm->current[offset - (2 * hnm->width) + 1]; hnm->current[writeoffset++] = hnm->current[offset++]; offset++; } else { hnm->current[writeoffset++] = hnm->current[offset++]; hnm->current[writeoffset++] = hnm->current[offset++]; } if (backward) offset -= 4; left--; } } if (swap) { left = count; writeoffset -= count * 2; while (left > 0) { swap = hnm->current[writeoffset]; hnm->current[writeoffset] = hnm->current[writeoffset + 1]; hnm->current[writeoffset + 1] = swap; left--; writeoffset += 2; } } } } } static void decode_interframe_v4a(AVCodecContext *avctx, uint8_t *src, uint32_t size) { Hnm4VideoContext *hnm = avctx->priv_data; GetByteContext gb; uint32_t writeoffset = 0, offset; uint8_t tag, count, previous, delta; bytestream2_init(&gb, src, size); while (bytestream2_tell(&gb) < size) { count = bytestream2_peek_byte(&gb) & 0x3F; if (count == 0) { tag = bytestream2_get_byte(&gb) & 0xC0; tag = tag >> 6; if (tag == 0) { writeoffset += bytestream2_get_byte(&gb); } else if (tag == 1) { if (writeoffset + hnm->width >= hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n"); break; } hnm->current[writeoffset] = bytestream2_get_byte(&gb); hnm->current[writeoffset + hnm->width] = bytestream2_get_byte(&gb); writeoffset++; } else if (tag == 2) { writeoffset += hnm->width; } else if (tag == 3) { break; } if (writeoffset > hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "writeoffset out of bounds\n"); break; } } else { delta = bytestream2_peek_byte(&gb) & 0x80; previous = bytestream2_peek_byte(&gb) & 0x40; bytestream2_skip(&gb, 1); offset = writeoffset; offset += bytestream2_get_le16(&gb); if (delta) { if (offset < 0x10000) { av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n"); break; } offset -= 0x10000; } if (offset + hnm->width + count >= hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "Attempting to read out of bounds\n"); break; } else if (writeoffset + hnm->width + count >= hnm->width * hnm->height) { av_log(avctx, AV_LOG_ERROR, "Attempting to write out of bounds\n"); break; } if (previous) { while (count > 0) { hnm->current[writeoffset] = hnm->previous[offset]; hnm->current[writeoffset + hnm->width] = hnm->previous[offset + hnm->width]; writeoffset++; offset++; count--; } } else { while (count > 0) { hnm->current[writeoffset] = hnm->current[offset]; hnm->current[writeoffset + hnm->width] = hnm->current[offset + hnm->width]; writeoffset++; offset++; count--; } } } } } static void hnm_update_palette(AVCodecContext *avctx, uint8_t *src, uint32_t size) { Hnm4VideoContext *hnm = avctx->priv_data; GetByteContext gb; uint8_t start, writeoffset; uint16_t count; int eight_bit_colors; eight_bit_colors = src[7] & 0x80 && hnm->version == 0x4a; // skip first 8 bytes bytestream2_init(&gb, src + 8, size - 8); while (bytestream2_tell(&gb) < size - 8) { start = bytestream2_get_byte(&gb); count = bytestream2_get_byte(&gb); if (start == 255 && count == 255) break; if (count == 0) count = 256; writeoffset = start; while (count > 0) { hnm->palette[writeoffset] = bytestream2_get_be24(&gb); if (!eight_bit_colors) hnm->palette[writeoffset] <<= 2; count--; writeoffset++; } } } static void hnm_flip_buffers(Hnm4VideoContext *hnm) { uint8_t *temp; temp = hnm->current; hnm->current = hnm->previous; hnm->previous = temp; } static int hnm_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { AVFrame *frame = data; Hnm4VideoContext *hnm = avctx->priv_data; int ret; uint16_t chunk_id; if (avpkt->size < 8) { av_log(avctx, AV_LOG_ERROR, "packet too small\n"); return AVERROR_INVALIDDATA; } chunk_id = AV_RL16(avpkt->data + 4); if (chunk_id == HNM4_CHUNK_ID_PL) { hnm_update_palette(avctx, avpkt->data, avpkt->size); } else if (chunk_id == HNM4_CHUNK_ID_IZ) { if (avpkt->size < 12) { av_log(avctx, AV_LOG_ERROR, "packet too small\n"); return AVERROR_INVALIDDATA; } if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) return ret; unpack_intraframe(avctx, avpkt->data + 12, avpkt->size - 12); memcpy(hnm->previous, hnm->current, hnm->width * hnm->height); if (hnm->version == 0x4a) memcpy(hnm->processed, hnm->current, hnm->width * hnm->height); else postprocess_current_frame(avctx); copy_processed_frame(avctx, frame); frame->pict_type = AV_PICTURE_TYPE_I; frame->key_frame = 1; memcpy(frame->data[1], hnm->palette, 256 * 4); *got_frame = 1; } else if (chunk_id == HNM4_CHUNK_ID_IU) { if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) return ret; if (hnm->version == 0x4a) { decode_interframe_v4a(avctx, avpkt->data + 8, avpkt->size - 8); memcpy(hnm->processed, hnm->current, hnm->width * hnm->height); } else { decode_interframe_v4(avctx, avpkt->data + 8, avpkt->size - 8); postprocess_current_frame(avctx); } copy_processed_frame(avctx, frame); frame->pict_type = AV_PICTURE_TYPE_P; frame->key_frame = 0; memcpy(frame->data[1], hnm->palette, 256 * 4); *got_frame = 1; hnm_flip_buffers(hnm); } else { av_log(avctx, AV_LOG_ERROR, "invalid chunk id: %d\n", chunk_id); return AVERROR_INVALIDDATA; } return avpkt->size; } static av_cold int hnm_decode_init(AVCodecContext *avctx) { Hnm4VideoContext *hnm = avctx->priv_data; int ret; if (avctx->extradata_size < 1) { av_log(avctx, AV_LOG_ERROR, "Extradata missing, decoder requires version number\n"); return AVERROR_INVALIDDATA; } ret = av_image_check_size(avctx->width, avctx->height, 0, avctx); if (ret < 0) return ret; hnm->version = avctx->extradata[0]; avctx->pix_fmt = AV_PIX_FMT_PAL8; hnm->width = avctx->width; hnm->height = avctx->height; hnm->buffer1 = av_mallocz(avctx->width * avctx->height); hnm->buffer2 = av_mallocz(avctx->width * avctx->height); hnm->processed = av_mallocz(avctx->width * avctx->height); if ( !hnm->buffer1 || !hnm->buffer2 || !hnm->processed || avctx->width * avctx->height == 0 || avctx->height % 2) { av_log(avctx, AV_LOG_ERROR, "av_mallocz() failed\n"); av_freep(&hnm->buffer1); av_freep(&hnm->buffer2); av_freep(&hnm->processed); return AVERROR(ENOMEM); } hnm->current = hnm->buffer1; hnm->previous = hnm->buffer2; return 0; } static av_cold int hnm_decode_end(AVCodecContext *avctx) { Hnm4VideoContext *hnm = avctx->priv_data; av_freep(&hnm->buffer1); av_freep(&hnm->buffer2); av_freep(&hnm->processed); return 0; } AVCodec ff_hnm4_video_decoder = { .name = "hnm4video", .long_name = NULL_IF_CONFIG_SMALL("HNM 4 video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_HNM4_VIDEO, .priv_data_size = sizeof(Hnm4VideoContext), .init = hnm_decode_init, .close = hnm_decode_end, .decode = hnm_decode_frame, .capabilities = CODEC_CAP_DR1, };