/* * Interplay MVE Video Decoder * Copyright (C) 2003 The FFmpeg project * * 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 */ /** * @file * Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net) * For more information about the Interplay MVE format, visit: * http://www.pcisys.net/~melanson/codecs/interplay-mve.txt * This code is written in such a way that the identifiers match up * with the encoding descriptions in the document. * * This decoder presently only supports a PAL8 output colorspace. * * An Interplay video frame consists of 2 parts: The decoding map and * the video data. A demuxer must load these 2 parts together in a single * buffer before sending it through the stream to this decoder. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #define BITSTREAM_READER_LE #include "avcodec.h" #include "bytestream.h" #include "get_bits.h" #include "hpeldsp.h" #include "internal.h" #define PALETTE_COUNT 256 typedef struct IpvideoContext { AVCodecContext *avctx; HpelDSPContext hdsp; AVFrame *second_last_frame; AVFrame *last_frame; const unsigned char *decoding_map; int decoding_map_size; int is_16bpp; GetByteContext stream_ptr, mv_ptr; unsigned char *pixel_ptr; int line_inc; int stride; int upper_motion_limit_offset; uint32_t pal[256]; } IpvideoContext; static int copy_from(IpvideoContext *s, AVFrame *src, AVFrame *dst, int delta_x, int delta_y) { int current_offset = s->pixel_ptr - dst->data[0]; int motion_offset = current_offset + delta_y * dst->linesize[0] + delta_x * (1 + s->is_16bpp); if (motion_offset < 0) { av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); return AVERROR_INVALIDDATA; } else if (motion_offset > s->upper_motion_limit_offset) { av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", motion_offset, s->upper_motion_limit_offset); return AVERROR_INVALIDDATA; } if (!src->data[0]) { av_log(s->avctx, AV_LOG_ERROR, "Invalid decode type, corrupted header?\n"); return AVERROR(EINVAL); } s->hdsp.put_pixels_tab[!s->is_16bpp][0](s->pixel_ptr, src->data[0] + motion_offset, dst->linesize[0], 8); return 0; } static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s, AVFrame *frame) { return copy_from(s, s->last_frame, frame, 0, 0); } static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s, AVFrame *frame) { return copy_from(s, s->second_last_frame, frame, 0, 0); } static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s, AVFrame *frame) { unsigned char B; int x, y; /* copy block from 2 frames ago using a motion vector; need 1 more byte */ if (!s->is_16bpp) { B = bytestream2_get_byte(&s->stream_ptr); } else { B = bytestream2_get_byte(&s->mv_ptr); } if (B < 56) { x = 8 + (B % 7); y = B / 7; } else { x = -14 + ((B - 56) % 29); y = 8 + ((B - 56) / 29); } ff_dlog(NULL, " motion byte = %d, (x, y) = (%d, %d)\n", B, x, y); return copy_from(s, s->second_last_frame, frame, x, y); } static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s, AVFrame *frame) { unsigned char B; int x, y; /* copy 8x8 block from current frame from an up/left block */ /* need 1 more byte for motion */ if (!s->is_16bpp) { B = bytestream2_get_byte(&s->stream_ptr); } else { B = bytestream2_get_byte(&s->mv_ptr); } if (B < 56) { x = -(8 + (B % 7)); y = -(B / 7); } else { x = -(-14 + ((B - 56) % 29)); y = -( 8 + ((B - 56) / 29)); } ff_dlog(NULL, " motion byte = %d, (x, y) = (%d, %d)\n", B, x, y); return copy_from(s, frame, frame, x, y); } static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s, AVFrame *frame) { int x, y; unsigned char B, BL, BH; /* copy a block from the previous frame; need 1 more byte */ if (!s->is_16bpp) { B = bytestream2_get_byte(&s->stream_ptr); } else { B = bytestream2_get_byte(&s->mv_ptr); } BL = B & 0x0F; BH = (B >> 4) & 0x0F; x = -8 + BL; y = -8 + BH; ff_dlog(NULL, " motion byte = %d, (x, y) = (%d, %d)\n", B, x, y); return copy_from(s, s->last_frame, frame, x, y); } static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s, AVFrame *frame) { signed char x, y; /* copy a block from the previous frame using an expanded range; * need 2 more bytes */ x = bytestream2_get_byte(&s->stream_ptr); y = bytestream2_get_byte(&s->stream_ptr); ff_dlog(NULL, " motion bytes = %d, %d\n", x, y); return copy_from(s, s->last_frame, frame, x, y); } static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s, AVFrame *frame) { /* mystery opcode? skip multiple blocks? */ av_log(s->avctx, AV_LOG_ERROR, " Interplay video: Help! Mystery opcode 0x6 seen\n"); /* report success */ return 0; } static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s, AVFrame *frame) { int x, y; unsigned char P[2]; unsigned int flags; /* 2-color encoding */ P[0] = bytestream2_get_byte(&s->stream_ptr); P[1] = bytestream2_get_byte(&s->stream_ptr); if (P[0] <= P[1]) { /* need 8 more bytes from the stream */ for (y = 0; y < 8; y++) { flags = bytestream2_get_byte(&s->stream_ptr) | 0x100; for (; flags != 1; flags >>= 1) *s->pixel_ptr++ = P[flags & 1]; s->pixel_ptr += s->line_inc; } } else { /* need 2 more bytes from the stream */ flags = bytestream2_get_le16(&s->stream_ptr); for (y = 0; y < 8; y += 2) { for (x = 0; x < 8; x += 2, flags >>= 1) { s->pixel_ptr[x ] = s->pixel_ptr[x + 1 ] = s->pixel_ptr[x + s->stride] = s->pixel_ptr[x + 1 + s->stride] = P[flags & 1]; } s->pixel_ptr += s->stride * 2; } } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s, AVFrame *frame) { int x, y; unsigned char P[4]; unsigned int flags = 0; /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on * either top and bottom or left and right halves */ P[0] = bytestream2_get_byte(&s->stream_ptr); P[1] = bytestream2_get_byte(&s->stream_ptr); if (P[0] <= P[1]) { for (y = 0; y < 16; y++) { // new values for each 4x4 block if (!(y & 3)) { if (y) { P[0] = bytestream2_get_byte(&s->stream_ptr); P[1] = bytestream2_get_byte(&s->stream_ptr); } flags = bytestream2_get_le16(&s->stream_ptr); } for (x = 0; x < 4; x++, flags >>= 1) *s->pixel_ptr++ = P[flags & 1]; s->pixel_ptr += s->stride - 4; // switch to right half if (y == 7) s->pixel_ptr -= 8 * s->stride - 4; } } else { flags = bytestream2_get_le32(&s->stream_ptr); P[2] = bytestream2_get_byte(&s->stream_ptr); P[3] = bytestream2_get_byte(&s->stream_ptr); if (P[2] <= P[3]) { /* vertical split; left & right halves are 2-color encoded */ for (y = 0; y < 16; y++) { for (x = 0; x < 4; x++, flags >>= 1) *s->pixel_ptr++ = P[flags & 1]; s->pixel_ptr += s->stride - 4; // switch to right half if (y == 7) { s->pixel_ptr -= 8 * s->stride - 4; P[0] = P[2]; P[1] = P[3]; flags = bytestream2_get_le32(&s->stream_ptr); } } } else { /* horizontal split; top & bottom halves are 2-color encoded */ for (y = 0; y < 8; y++) { if (y == 4) { P[0] = P[2]; P[1] = P[3]; flags = bytestream2_get_le32(&s->stream_ptr); } for (x = 0; x < 8; x++, flags >>= 1) *s->pixel_ptr++ = P[flags & 1]; s->pixel_ptr += s->line_inc; } } } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s, AVFrame *frame) { int x, y; unsigned char P[4]; /* 4-color encoding */ bytestream2_get_buffer(&s->stream_ptr, P, 4); if (P[0] <= P[1]) { if (P[2] <= P[3]) { /* 1 of 4 colors for each pixel, need 16 more bytes */ for (y = 0; y < 8; y++) { /* get the next set of 8 2-bit flags */ int flags = bytestream2_get_le16(&s->stream_ptr); for (x = 0; x < 8; x++, flags >>= 2) *s->pixel_ptr++ = P[flags & 0x03]; s->pixel_ptr += s->line_inc; } } else { uint32_t flags; /* 1 of 4 colors for each 2x2 block, need 4 more bytes */ flags = bytestream2_get_le32(&s->stream_ptr); for (y = 0; y < 8; y += 2) { for (x = 0; x < 8; x += 2, flags >>= 2) { s->pixel_ptr[x ] = s->pixel_ptr[x + 1 ] = s->pixel_ptr[x + s->stride] = s->pixel_ptr[x + 1 + s->stride] = P[flags & 0x03]; } s->pixel_ptr += s->stride * 2; } } } else { uint64_t flags; /* 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes */ flags = bytestream2_get_le64(&s->stream_ptr); if (P[2] <= P[3]) { for (y = 0; y < 8; y++) { for (x = 0; x < 8; x += 2, flags >>= 2) { s->pixel_ptr[x ] = s->pixel_ptr[x + 1] = P[flags & 0x03]; } s->pixel_ptr += s->stride; } } else { for (y = 0; y < 8; y += 2) { for (x = 0; x < 8; x++, flags >>= 2) { s->pixel_ptr[x ] = s->pixel_ptr[x + s->stride] = P[flags & 0x03]; } s->pixel_ptr += s->stride * 2; } } } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s, AVFrame *frame) { int x, y; unsigned char P[8]; int flags = 0; bytestream2_get_buffer(&s->stream_ptr, P, 4); /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on * either top and bottom or left and right halves */ if (P[0] <= P[1]) { /* 4-color encoding for each quadrant; need 32 bytes */ for (y = 0; y < 16; y++) { // new values for each 4x4 block if (!(y & 3)) { if (y) bytestream2_get_buffer(&s->stream_ptr, P, 4); flags = bytestream2_get_le32(&s->stream_ptr); } for (x = 0; x < 4; x++, flags >>= 2) *s->pixel_ptr++ = P[flags & 0x03]; s->pixel_ptr += s->stride - 4; // switch to right half if (y == 7) s->pixel_ptr -= 8 * s->stride - 4; } } else { // vertical split? int vert; uint64_t flags = bytestream2_get_le64(&s->stream_ptr); bytestream2_get_buffer(&s->stream_ptr, P + 4, 4); vert = P[4] <= P[5]; /* 4-color encoding for either left and right or top and bottom * halves */ for (y = 0; y < 16; y++) { for (x = 0; x < 4; x++, flags >>= 2) *s->pixel_ptr++ = P[flags & 0x03]; if (vert) { s->pixel_ptr += s->stride - 4; // switch to right half if (y == 7) s->pixel_ptr -= 8 * s->stride - 4; } else if (y & 1) s->pixel_ptr += s->line_inc; // load values for second half if (y == 7) { memcpy(P, P + 4, 4); flags = bytestream2_get_le64(&s->stream_ptr); } } } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s, AVFrame *frame) { int y; /* 64-color encoding (each pixel in block is a different color) */ for (y = 0; y < 8; y++) { bytestream2_get_buffer(&s->stream_ptr, s->pixel_ptr, 8); s->pixel_ptr += s->stride; } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s, AVFrame *frame) { int x, y; /* 16-color block encoding: each 2x2 block is a different color */ for (y = 0; y < 8; y += 2) { for (x = 0; x < 8; x += 2) { s->pixel_ptr[x ] = s->pixel_ptr[x + 1 ] = s->pixel_ptr[x + s->stride] = s->pixel_ptr[x + 1 + s->stride] = bytestream2_get_byte(&s->stream_ptr); } s->pixel_ptr += s->stride * 2; } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s, AVFrame *frame) { int y; unsigned char P[2]; /* 4-color block encoding: each 4x4 block is a different color */ for (y = 0; y < 8; y++) { if (!(y & 3)) { P[0] = bytestream2_get_byte(&s->stream_ptr); P[1] = bytestream2_get_byte(&s->stream_ptr); } memset(s->pixel_ptr, P[0], 4); memset(s->pixel_ptr + 4, P[1], 4); s->pixel_ptr += s->stride; } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s, AVFrame *frame) { int y; unsigned char pix; /* 1-color encoding: the whole block is 1 solid color */ pix = bytestream2_get_byte(&s->stream_ptr); for (y = 0; y < 8; y++) { memset(s->pixel_ptr, pix, 8); s->pixel_ptr += s->stride; } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s, AVFrame *frame) { int x, y; unsigned char sample[2]; /* dithered encoding */ sample[0] = bytestream2_get_byte(&s->stream_ptr); sample[1] = bytestream2_get_byte(&s->stream_ptr); for (y = 0; y < 8; y++) { for (x = 0; x < 8; x += 2) { *s->pixel_ptr++ = sample[ y & 1 ]; *s->pixel_ptr++ = sample[!(y & 1)]; } s->pixel_ptr += s->line_inc; } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0x6_16(IpvideoContext *s, AVFrame *frame) { signed char x, y; /* copy a block from the second last frame using an expanded range */ x = bytestream2_get_byte(&s->stream_ptr); y = bytestream2_get_byte(&s->stream_ptr); ff_dlog(NULL, " motion bytes = %d, %d\n", x, y); return copy_from(s, s->second_last_frame, frame, x, y); } static int ipvideo_decode_block_opcode_0x7_16(IpvideoContext *s, AVFrame *frame) { int x, y; uint16_t P[2]; unsigned int flags; uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr; /* 2-color encoding */ P[0] = bytestream2_get_le16(&s->stream_ptr); P[1] = bytestream2_get_le16(&s->stream_ptr); if (!(P[0] & 0x8000)) { for (y = 0; y < 8; y++) { flags = bytestream2_get_byte(&s->stream_ptr) | 0x100; for (; flags != 1; flags >>= 1) *pixel_ptr++ = P[flags & 1]; pixel_ptr += s->line_inc; } } else { flags = bytestream2_get_le16(&s->stream_ptr); for (y = 0; y < 8; y += 2) { for (x = 0; x < 8; x += 2, flags >>= 1) { pixel_ptr[x ] = pixel_ptr[x + 1 ] = pixel_ptr[x + s->stride] = pixel_ptr[x + 1 + s->stride] = P[flags & 1]; } pixel_ptr += s->stride * 2; } } return 0; } static int ipvideo_decode_block_opcode_0x8_16(IpvideoContext *s, AVFrame *frame) { int x, y; uint16_t P[4]; unsigned int flags = 0; uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr; /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on * either top and bottom or left and right halves */ P[0] = bytestream2_get_le16(&s->stream_ptr); P[1] = bytestream2_get_le16(&s->stream_ptr); if (!(P[0] & 0x8000)) { for (y = 0; y < 16; y++) { // new values for each 4x4 block if (!(y & 3)) { if (y) { P[0] = bytestream2_get_le16(&s->stream_ptr); P[1] = bytestream2_get_le16(&s->stream_ptr); } flags = bytestream2_get_le16(&s->stream_ptr); } for (x = 0; x < 4; x++, flags >>= 1) *pixel_ptr++ = P[flags & 1]; pixel_ptr += s->stride - 4; // switch to right half if (y == 7) pixel_ptr -= 8 * s->stride - 4; } } else { flags = bytestream2_get_le32(&s->stream_ptr); P[2] = bytestream2_get_le16(&s->stream_ptr); P[3] = bytestream2_get_le16(&s->stream_ptr); if (!(P[2] & 0x8000)) { /* vertical split; left & right halves are 2-color encoded */ for (y = 0; y < 16; y++) { for (x = 0; x < 4; x++, flags >>= 1) *pixel_ptr++ = P[flags & 1]; pixel_ptr += s->stride - 4; // switch to right half if (y == 7) { pixel_ptr -= 8 * s->stride - 4; P[0] = P[2]; P[1] = P[3]; flags = bytestream2_get_le32(&s->stream_ptr); } } } else { /* horizontal split; top & bottom halves are 2-color encoded */ for (y = 0; y < 8; y++) { if (y == 4) { P[0] = P[2]; P[1] = P[3]; flags = bytestream2_get_le32(&s->stream_ptr); } for (x = 0; x < 8; x++, flags >>= 1) *pixel_ptr++ = P[flags & 1]; pixel_ptr += s->line_inc; } } } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0x9_16(IpvideoContext *s, AVFrame *frame) { int x, y; uint16_t P[4]; uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr; /* 4-color encoding */ for (x = 0; x < 4; x++) P[x] = bytestream2_get_le16(&s->stream_ptr); if (!(P[0] & 0x8000)) { if (!(P[2] & 0x8000)) { /* 1 of 4 colors for each pixel */ for (y = 0; y < 8; y++) { /* get the next set of 8 2-bit flags */ int flags = bytestream2_get_le16(&s->stream_ptr); for (x = 0; x < 8; x++, flags >>= 2) *pixel_ptr++ = P[flags & 0x03]; pixel_ptr += s->line_inc; } } else { uint32_t flags; /* 1 of 4 colors for each 2x2 block */ flags = bytestream2_get_le32(&s->stream_ptr); for (y = 0; y < 8; y += 2) { for (x = 0; x < 8; x += 2, flags >>= 2) { pixel_ptr[x ] = pixel_ptr[x + 1 ] = pixel_ptr[x + s->stride] = pixel_ptr[x + 1 + s->stride] = P[flags & 0x03]; } pixel_ptr += s->stride * 2; } } } else { uint64_t flags; /* 1 of 4 colors for each 2x1 or 1x2 block */ flags = bytestream2_get_le64(&s->stream_ptr); if (!(P[2] & 0x8000)) { for (y = 0; y < 8; y++) { for (x = 0; x < 8; x += 2, flags >>= 2) { pixel_ptr[x ] = pixel_ptr[x + 1] = P[flags & 0x03]; } pixel_ptr += s->stride; } } else { for (y = 0; y < 8; y += 2) { for (x = 0; x < 8; x++, flags >>= 2) { pixel_ptr[x ] = pixel_ptr[x + s->stride] = P[flags & 0x03]; } pixel_ptr += s->stride * 2; } } } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xA_16(IpvideoContext *s, AVFrame *frame) { int x, y; uint16_t P[8]; int flags = 0; uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr; for (x = 0; x < 4; x++) P[x] = bytestream2_get_le16(&s->stream_ptr); /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on * either top and bottom or left and right halves */ if (!(P[0] & 0x8000)) { /* 4-color encoding for each quadrant */ for (y = 0; y < 16; y++) { // new values for each 4x4 block if (!(y & 3)) { if (y) for (x = 0; x < 4; x++) P[x] = bytestream2_get_le16(&s->stream_ptr); flags = bytestream2_get_le32(&s->stream_ptr); } for (x = 0; x < 4; x++, flags >>= 2) *pixel_ptr++ = P[flags & 0x03]; pixel_ptr += s->stride - 4; // switch to right half if (y == 7) pixel_ptr -= 8 * s->stride - 4; } } else { // vertical split? int vert; uint64_t flags = bytestream2_get_le64(&s->stream_ptr); for (x = 4; x < 8; x++) P[x] = bytestream2_get_le16(&s->stream_ptr); vert = !(P[4] & 0x8000); /* 4-color encoding for either left and right or top and bottom * halves */ for (y = 0; y < 16; y++) { for (x = 0; x < 4; x++, flags >>= 2) *pixel_ptr++ = P[flags & 0x03]; if (vert) { pixel_ptr += s->stride - 4; // switch to right half if (y == 7) pixel_ptr -= 8 * s->stride - 4; } else if (y & 1) pixel_ptr += s->line_inc; // load values for second half if (y == 7) { memcpy(P, P + 4, 8); flags = bytestream2_get_le64(&s->stream_ptr); } } } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xB_16(IpvideoContext *s, AVFrame *frame) { int x, y; uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr; /* 64-color encoding (each pixel in block is a different color) */ for (y = 0; y < 8; y++) { for (x = 0; x < 8; x++) pixel_ptr[x] = bytestream2_get_le16(&s->stream_ptr); pixel_ptr += s->stride; } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xC_16(IpvideoContext *s, AVFrame *frame) { int x, y; uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr; /* 16-color block encoding: each 2x2 block is a different color */ for (y = 0; y < 8; y += 2) { for (x = 0; x < 8; x += 2) { pixel_ptr[x ] = pixel_ptr[x + 1 ] = pixel_ptr[x + s->stride] = pixel_ptr[x + 1 + s->stride] = bytestream2_get_le16(&s->stream_ptr); } pixel_ptr += s->stride * 2; } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xD_16(IpvideoContext *s, AVFrame *frame) { int x, y; uint16_t P[2]; uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr; /* 4-color block encoding: each 4x4 block is a different color */ for (y = 0; y < 8; y++) { if (!(y & 3)) { P[0] = bytestream2_get_le16(&s->stream_ptr); P[1] = bytestream2_get_le16(&s->stream_ptr); } for (x = 0; x < 8; x++) pixel_ptr[x] = P[x >> 2]; pixel_ptr += s->stride; } /* report success */ return 0; } static int ipvideo_decode_block_opcode_0xE_16(IpvideoContext *s, AVFrame *frame) { int x, y; uint16_t pix; uint16_t *pixel_ptr = (uint16_t*)s->pixel_ptr; /* 1-color encoding: the whole block is 1 solid color */ pix = bytestream2_get_le16(&s->stream_ptr); for (y = 0; y < 8; y++) { for (x = 0; x < 8; x++) pixel_ptr[x] = pix; pixel_ptr += s->stride; } /* report success */ return 0; } static int (* const ipvideo_decode_block[])(IpvideoContext *s, AVFrame *frame) = { ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1, ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3, ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5, ipvideo_decode_block_opcode_0x6, ipvideo_decode_block_opcode_0x7, ipvideo_decode_block_opcode_0x8, ipvideo_decode_block_opcode_0x9, ipvideo_decode_block_opcode_0xA, ipvideo_decode_block_opcode_0xB, ipvideo_decode_block_opcode_0xC, ipvideo_decode_block_opcode_0xD, ipvideo_decode_block_opcode_0xE, ipvideo_decode_block_opcode_0xF, }; static int (* const ipvideo_decode_block16[])(IpvideoContext *s, AVFrame *frame) = { ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1, ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3, ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5, ipvideo_decode_block_opcode_0x6_16, ipvideo_decode_block_opcode_0x7_16, ipvideo_decode_block_opcode_0x8_16, ipvideo_decode_block_opcode_0x9_16, ipvideo_decode_block_opcode_0xA_16, ipvideo_decode_block_opcode_0xB_16, ipvideo_decode_block_opcode_0xC_16, ipvideo_decode_block_opcode_0xD_16, ipvideo_decode_block_opcode_0xE_16, ipvideo_decode_block_opcode_0x1, }; static void ipvideo_decode_opcodes(IpvideoContext *s, AVFrame *frame) { int x, y; unsigned char opcode; int ret; GetBitContext gb; bytestream2_skip(&s->stream_ptr, 14); /* data starts 14 bytes in */ if (!s->is_16bpp) { /* this is PAL8, so make the palette available */ memcpy(frame->data[1], s->pal, AVPALETTE_SIZE); s->stride = frame->linesize[0]; } else { s->stride = frame->linesize[0] >> 1; s->mv_ptr = s->stream_ptr; bytestream2_skip(&s->mv_ptr, bytestream2_get_le16(&s->stream_ptr)); } s->line_inc = s->stride - 8; s->upper_motion_limit_offset = (s->avctx->height - 8) * frame->linesize[0] + (s->avctx->width - 8) * (1 + s->is_16bpp); init_get_bits(&gb, s->decoding_map, s->decoding_map_size * 8); for (y = 0; y < s->avctx->height; y += 8) { for (x = 0; x < s->avctx->width; x += 8) { opcode = get_bits(&gb, 4); ff_dlog(s->avctx, " block @ (%3d, %3d): encoding 0x%X, data ptr offset %d\n", x, y, opcode, bytestream2_tell(&s->stream_ptr)); if (!s->is_16bpp) { s->pixel_ptr = frame->data[0] + x + y*frame->linesize[0]; ret = ipvideo_decode_block[opcode](s, frame); } else { s->pixel_ptr = frame->data[0] + x*2 + y*frame->linesize[0]; ret = ipvideo_decode_block16[opcode](s, frame); } if (ret != 0) { av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n", s->avctx->frame_number, x, y); return; } } } if (bytestream2_get_bytes_left(&s->stream_ptr) > 1) { av_log(s->avctx, AV_LOG_ERROR, "Interplay video: decode finished with %d bytes left over\n", bytestream2_get_bytes_left(&s->stream_ptr)); } } static av_cold int ipvideo_decode_init(AVCodecContext *avctx) { IpvideoContext *s = avctx->priv_data; s->avctx = avctx; s->is_16bpp = avctx->bits_per_coded_sample == 16; avctx->pix_fmt = s->is_16bpp ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_PAL8; ff_hpeldsp_init(&s->hdsp, avctx->flags); s->last_frame = av_frame_alloc(); s->second_last_frame = av_frame_alloc(); if (!s->last_frame || !s->second_last_frame) { av_frame_free(&s->last_frame); av_frame_free(&s->second_last_frame); return AVERROR(ENOMEM); } return 0; } static int ipvideo_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; IpvideoContext *s = avctx->priv_data; AVFrame *frame = data; int ret; /* decoding map contains 4 bits of information per 8x8 block */ s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2); /* compressed buffer needs to be large enough to at least hold an entire * decoding map */ if (buf_size < s->decoding_map_size) return buf_size; s->decoding_map = buf; bytestream2_init(&s->stream_ptr, buf + s->decoding_map_size, buf_size - s->decoding_map_size); if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) { av_log(avctx, AV_LOG_ERROR, " Interplay Video: get_buffer() failed\n"); return ret; } if (!s->is_16bpp) { const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); if (pal) { frame->palette_has_changed = 1; memcpy(s->pal, pal, AVPALETTE_SIZE); } } ipvideo_decode_opcodes(s, frame); *got_frame = 1; /* shuffle frames */ av_frame_unref(s->second_last_frame); FFSWAP(AVFrame*, s->second_last_frame, s->last_frame); if ((ret = av_frame_ref(s->last_frame, frame)) < 0) return ret; /* report that the buffer was completely consumed */ return buf_size; } static av_cold int ipvideo_decode_end(AVCodecContext *avctx) { IpvideoContext *s = avctx->priv_data; av_frame_free(&s->last_frame); av_frame_free(&s->second_last_frame); return 0; } AVCodec ff_interplay_video_decoder = { .name = "interplayvideo", .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_INTERPLAY_VIDEO, .priv_data_size = sizeof(IpvideoContext), .init = ipvideo_decode_init, .close = ipvideo_decode_end, .decode = ipvideo_decode_frame, .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_PARAM_CHANGE, };