mirror of https://github.com/FFmpeg/FFmpeg.git
Kostya Shishkov
13 years ago
committed by
Martin Storsjö
parent
44729bc020
commit
f545e00677
11 changed files with 510 additions and 2 deletions
@ -0,0 +1,360 @@ |
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/*
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* Discworld II BMV video and audio decoder |
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* Copyright (c) 2011 Konstantin Shishkov |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avcodec.h" |
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#include "bytestream.h" |
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enum BMVFlags{ |
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BMV_NOP = 0, |
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BMV_END, |
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BMV_DELTA, |
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BMV_INTRA, |
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BMV_SCROLL = 0x04, |
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BMV_PALETTE = 0x08, |
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BMV_COMMAND = 0x10, |
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BMV_AUDIO = 0x20, |
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BMV_EXT = 0x40, |
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BMV_PRINT = 0x80 |
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}; |
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#define SCREEN_WIDE 640 |
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#define SCREEN_HIGH 429 |
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typedef struct BMVDecContext { |
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AVCodecContext *avctx; |
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AVFrame pic; |
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uint8_t *frame, frame_base[SCREEN_WIDE * (SCREEN_HIGH + 1)]; |
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uint32_t pal[256]; |
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const uint8_t *stream; |
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} BMVDecContext; |
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#define NEXT_BYTE(v) v = forward ? v + 1 : v - 1; |
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static int decode_bmv_frame(const uint8_t *source, int src_len, uint8_t *frame, int frame_off) |
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{ |
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int val, saved_val = 0; |
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int tmplen = src_len; |
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const uint8_t *src, *source_end = source + src_len; |
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uint8_t *frame_end = frame + SCREEN_WIDE * SCREEN_HIGH; |
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uint8_t *dst, *dst_end; |
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int len, mask; |
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int forward = (frame_off <= -SCREEN_WIDE) || (frame_off >= 0); |
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int read_two_nibbles, flag; |
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int advance_mode; |
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int mode = 0; |
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int i; |
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if (src_len <= 0) |
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return -1; |
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if (forward) { |
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src = source; |
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dst = frame; |
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dst_end = frame_end; |
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} else { |
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src = source + src_len - 1; |
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dst = frame_end - 1; |
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dst_end = frame - 1; |
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} |
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for (;;) { |
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int shift = 0; |
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flag = 0; |
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/* The mode/len decoding is a bit strange:
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* values are coded as variable-length codes with nibble units, |
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* code end is signalled by two top bits in the nibble being nonzero. |
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* And since data is bytepacked and we read two nibbles at a time, |
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* we may get a nibble belonging to the next code. |
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* Hence this convoluted loop. |
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*/ |
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if (!mode || (tmplen == 4)) { |
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if (src < source || src >= source_end) |
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return -1; |
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val = *src; |
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read_two_nibbles = 1; |
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} else { |
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val = saved_val; |
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read_two_nibbles = 0; |
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} |
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if (!(val & 0xC)) { |
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for (;;) { |
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if (!read_two_nibbles) { |
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if (src < source || src >= source_end) |
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return -1; |
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shift += 2; |
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val |= *src << shift; |
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if (*src & 0xC) |
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break; |
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} |
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// two upper bits of the nibble is zero,
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// so shift top nibble value down into their place
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read_two_nibbles = 0; |
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shift += 2; |
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mask = (1 << shift) - 1; |
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val = ((val >> 2) & ~mask) | (val & mask); |
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NEXT_BYTE(src); |
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if ((val & (0xC << shift))) { |
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flag = 1; |
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break; |
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} |
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} |
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} else if (mode) { |
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flag = tmplen != 4; |
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} |
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if (flag) { |
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tmplen = 4; |
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} else { |
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saved_val = val >> (4 + shift); |
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tmplen = 0; |
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val &= (1 << (shift + 4)) - 1; |
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NEXT_BYTE(src); |
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} |
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advance_mode = val & 1; |
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len = (val >> 1) - 1; |
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mode += 1 + advance_mode; |
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if (mode >= 4) |
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mode -= 3; |
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if (FFABS(dst_end - dst) < len) |
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return -1; |
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switch (mode) { |
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case 1: |
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if (forward) { |
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if (dst - frame + SCREEN_WIDE < frame_off || |
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frame_end - dst < frame_off + len) |
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return -1; |
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for (i = 0; i < len; i++) |
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dst[i] = dst[frame_off + i]; |
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dst += len; |
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} else { |
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dst -= len; |
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if (dst - frame + SCREEN_WIDE < frame_off || |
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frame_end - dst < frame_off + len) |
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return -1; |
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for (i = len - 1; i >= 0; i--) |
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dst[i] = dst[frame_off + i]; |
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} |
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break; |
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case 2: |
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if (forward) { |
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if (source + src_len - src < len) |
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return -1; |
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memcpy(dst, src, len); |
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dst += len; |
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src += len; |
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} else { |
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if (src - source < len) |
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return -1; |
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dst -= len; |
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src -= len; |
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memcpy(dst, src, len); |
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} |
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break; |
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case 3: |
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val = forward ? dst[-1] : dst[1]; |
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if (forward) { |
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memset(dst, val, len); |
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dst += len; |
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} else { |
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dst -= len; |
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memset(dst, val, len); |
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} |
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break; |
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default: |
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break; |
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} |
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if (dst == dst_end) |
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return 0; |
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} |
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return 0; |
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} |
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *pkt) |
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{ |
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BMVDecContext * const c = avctx->priv_data; |
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int type, scr_off; |
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int i; |
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uint8_t *srcptr, *outptr; |
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c->stream = pkt->data; |
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type = bytestream_get_byte(&c->stream); |
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if (type & BMV_AUDIO) { |
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int blobs = bytestream_get_byte(&c->stream); |
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if (pkt->size < blobs * 65 + 2) { |
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av_log(avctx, AV_LOG_ERROR, "Audio data doesn't fit in frame\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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c->stream += blobs * 65; |
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} |
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if (type & BMV_COMMAND) { |
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int command_size = (type & BMV_PRINT) ? 8 : 10; |
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if (c->stream - pkt->data + command_size > pkt->size) { |
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av_log(avctx, AV_LOG_ERROR, "Command data doesn't fit in frame\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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c->stream += command_size; |
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} |
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if (type & BMV_PALETTE) { |
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if (c->stream - pkt->data > pkt->size - 768) { |
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av_log(avctx, AV_LOG_ERROR, "Palette data doesn't fit in frame\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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for (i = 0; i < 256; i++) |
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c->pal[i] = bytestream_get_be24(&c->stream); |
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} |
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if (type & BMV_SCROLL) { |
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if (c->stream - pkt->data > pkt->size - 2) { |
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av_log(avctx, AV_LOG_ERROR, "Screen offset data doesn't fit in frame\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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scr_off = (int16_t)bytestream_get_le16(&c->stream); |
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} else if ((type & BMV_INTRA) == BMV_INTRA) { |
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scr_off = -640; |
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} else { |
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scr_off = 0; |
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} |
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if (decode_bmv_frame(c->stream, pkt->size - (c->stream - pkt->data), c->frame, scr_off)) { |
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame data\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE); |
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c->pic.palette_has_changed = type & BMV_PALETTE; |
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outptr = c->pic.data[0]; |
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srcptr = c->frame; |
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for (i = 0; i < avctx->height; i++) { |
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memcpy(outptr, srcptr, avctx->width); |
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srcptr += avctx->width; |
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outptr += c->pic.linesize[0]; |
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} |
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*data_size = sizeof(AVFrame); |
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*(AVFrame*)data = c->pic; |
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/* always report that the buffer was completely consumed */ |
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return pkt->size; |
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} |
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static av_cold int decode_init(AVCodecContext *avctx) |
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{ |
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BMVDecContext * const c = avctx->priv_data; |
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c->avctx = avctx; |
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avctx->pix_fmt = PIX_FMT_PAL8; |
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c->pic.reference = 1; |
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if (avctx->get_buffer(avctx, &c->pic) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return -1; |
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} |
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c->frame = c->frame_base + 640; |
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return 0; |
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} |
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static av_cold int decode_end(AVCodecContext *avctx) |
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{ |
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BMVDecContext *c = avctx->priv_data; |
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if (c->pic.data[0]) |
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avctx->release_buffer(avctx, &c->pic); |
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return 0; |
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} |
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static const int bmv_aud_mults[16] = { |
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16512, 8256, 4128, 2064, 1032, 516, 258, 192, 129, 88, 64, 56, 48, 40, 36, 32 |
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}; |
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static av_cold int bmv_aud_decode_init(AVCodecContext *avctx) |
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{ |
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if (avctx->channels != 2) { |
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av_log(avctx, AV_LOG_INFO, "invalid number of channels\n"); |
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return AVERROR(EINVAL); |
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} |
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avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
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return 0; |
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} |
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static int bmv_aud_decode_frame(AVCodecContext *avctx, void *data, int *data_size, |
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AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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int blocks = 0, total_blocks, i; |
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int out_size; |
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int16_t *output_samples = data; |
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int scale[2]; |
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total_blocks = *buf++; |
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if (buf_size < total_blocks * 65 + 1) { |
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av_log(avctx, AV_LOG_ERROR, "expected %d bytes, got %d\n", |
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total_blocks * 65 + 1, buf_size); |
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return AVERROR_INVALIDDATA; |
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} |
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out_size = total_blocks * 64 * sizeof(*output_samples); |
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if (*data_size < out_size) { |
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av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n"); |
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return AVERROR(EINVAL); |
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} |
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for (blocks = 0; blocks < total_blocks; blocks++) { |
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uint8_t code = *buf++; |
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code = (code >> 1) | (code << 7); |
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scale[0] = bmv_aud_mults[code & 0xF]; |
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scale[1] = bmv_aud_mults[code >> 4]; |
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for (i = 0; i < 32; i++) { |
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*output_samples++ = av_clip_int16((scale[0] * (int8_t)*buf++) >> 5); |
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*output_samples++ = av_clip_int16((scale[1] * (int8_t)*buf++) >> 5); |
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} |
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} |
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*data_size = out_size; |
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return buf_size; |
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} |
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AVCodec ff_bmv_video_decoder = { |
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.name = "bmv_video", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = CODEC_ID_BMV_VIDEO, |
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.priv_data_size = sizeof(BMVDecContext), |
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.init = decode_init, |
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.close = decode_end, |
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.decode = decode_frame, |
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.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV video"), |
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}; |
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AVCodec ff_bmv_audio_decoder = { |
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.name = "bmv_audio", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = CODEC_ID_BMV_AUDIO, |
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.init = bmv_aud_decode_init, |
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.decode = bmv_aud_decode_frame, |
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.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV audio"), |
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}; |
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@ -0,0 +1,136 @@ |
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/*
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* Discworld II BMV demuxer |
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* Copyright (c) 2011 Konstantin Shishkov. |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avformat.h" |
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enum BMVFlags { |
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BMV_NOP = 0, |
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BMV_END, |
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BMV_DELTA, |
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BMV_INTRA, |
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BMV_AUDIO = 0x20, |
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}; |
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typedef struct BMVContext { |
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uint8_t *packet; |
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int size; |
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int get_next; |
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int64_t audio_pos; |
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} BMVContext; |
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static int bmv_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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AVStream *st, *ast; |
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BMVContext *c = s->priv_data; |
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st = avformat_new_stream(s, 0); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codec->codec_id = CODEC_ID_BMV_VIDEO; |
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st->codec->width = 640; |
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st->codec->height = 429; |
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st->codec->pix_fmt = PIX_FMT_PAL8; |
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av_set_pts_info(st, 16, 1, 12); |
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ast = avformat_new_stream(s, 0); |
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if (!ast) |
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return AVERROR(ENOMEM); |
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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ast->codec->codec_id = CODEC_ID_BMV_AUDIO; |
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ast->codec->channels = 2; |
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ast->codec->sample_rate = 22050; |
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av_set_pts_info(ast, 16, 1, 22050); |
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c->get_next = 1; |
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c->audio_pos = 0; |
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return 0; |
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} |
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static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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BMVContext *c = s->priv_data; |
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int type; |
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void *tmp; |
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while (c->get_next) { |
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if (s->pb->eof_reached) |
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return AVERROR_EOF; |
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type = avio_r8(s->pb); |
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if (type == BMV_NOP) |
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continue; |
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if (type == BMV_END) |
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return AVERROR_EOF; |
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c->size = avio_rl24(s->pb); |
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if (!c->size) |
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return AVERROR_INVALIDDATA; |
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tmp = av_realloc(c->packet, c->size + 1); |
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if (!tmp) |
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return AVERROR(ENOMEM); |
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c->packet = tmp; |
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c->packet[0] = type; |
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if (avio_read(s->pb, c->packet + 1, c->size) != c->size) |
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return AVERROR(EIO); |
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if (type & BMV_AUDIO) { |
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int audio_size = c->packet[1] * 65 + 1; |
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if (audio_size >= c->size) { |
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av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n", |
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audio_size, c->size); |
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return AVERROR_INVALIDDATA; |
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} |
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if (av_new_packet(pkt, audio_size) < 0) |
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return AVERROR(ENOMEM); |
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memcpy(pkt->data, c->packet + 1, pkt->size); |
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pkt->stream_index = 1; |
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pkt->pts = c->audio_pos; |
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pkt->duration = c->packet[1] * 32; |
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c->audio_pos += pkt->duration; |
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c->get_next = 0; |
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return pkt->size; |
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} else |
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break; |
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} |
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if (av_new_packet(pkt, c->size + 1) < 0) |
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return AVERROR(ENOMEM); |
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pkt->stream_index = 0; |
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c->get_next = 1; |
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memcpy(pkt->data, c->packet, pkt->size); |
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return pkt->size; |
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} |
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static int bmv_read_close(AVFormatContext *s) |
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{ |
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BMVContext *c = s->priv_data; |
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av_freep(&c->packet); |
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return 0; |
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} |
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AVInputFormat ff_bmv_demuxer = { |
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.name = "bmv", |
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.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"), |
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.priv_data_size = sizeof(BMVContext), |
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.read_header = bmv_read_header, |
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.read_packet = bmv_read_packet, |
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.read_close = bmv_read_close, |
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.extensions = "bmv" |
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}; |
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