mirror of https://github.com/FFmpeg/FFmpeg.git
patch by Nicholas Tung, ntung ntung com Originally committed as revision 8649 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Nicholas Tung
18 years ago
committed by
Diego Biurrun
parent
e5b5149603
commit
1e6c67599e
11 changed files with 393 additions and 0 deletions
@ -0,0 +1,139 @@ |
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/*
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* Bethesda VID video decoder |
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* Copyright (C) 2007 Nicholas Tung |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/**
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* @file bethsoftvideo.c |
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* @brief Bethesda Softworks VID Video Decoder |
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* @author Nicholas Tung [ntung (at. ntung com] (2007-03) |
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* @sa http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
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* @sa http://www.svatopluk.com/andux/docs/dfvid.html
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*/ |
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#include "common.h" |
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#include "dsputil.h" |
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#include "bethsoftvideo.h" |
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#include "bytestream.h" |
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typedef struct BethsoftvidContext { |
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AVFrame frame; |
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} BethsoftvidContext; |
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static int bethsoftvid_decode_init(AVCodecContext *avctx) |
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{ |
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BethsoftvidContext *vid = avctx->priv_data; |
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vid->frame.reference = 1; |
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vid->frame.buffer_hints = FF_BUFFER_HINTS_VALID | |
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FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; |
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avctx->pix_fmt = PIX_FMT_PAL8; // palette in vid->frame.data[1]
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av_log(avctx, AV_LOG_DEBUG, "[bethsoftvid video decoder] init\n"); |
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return 0; |
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} |
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static void set_palette(AVFrame * frame, uint8_t * palette_buffer) |
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{ |
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uint32_t * palette = (uint32_t *)frame->data[1]; |
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int a; |
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for(a = 0; a < VID_PALETTE_NUMCOLORS; a++) |
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{ |
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palette[a] = AV_RB24(&palette_buffer[a * 3]) * 4; // multiply all colors by 4
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} |
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frame->palette_has_changed = 1; |
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} |
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static int bethsoftvid_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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uint8_t *buf, int buf_size) |
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{ |
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BethsoftvidContext * vid = avctx->priv_data; |
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char block_type; |
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uint8_t * destination; |
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uint8_t * frame_end; |
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int line_remaining = avctx->width; // number of bytes remaining on a line
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const int wrap_to_next_line = vid->frame.linesize[0] - avctx->width; |
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uint8_t rle_num_bytes; |
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int yoffset; |
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av_log(avctx, AV_LOG_DEBUG, "[bethsoftvid video decoder] decoding frame\n"); |
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// reget buffer will copy old data, good for simple difference frames
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if (avctx->reget_buffer(avctx, &vid->frame)) { |
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
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return -1; |
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} |
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destination = vid->frame.data[0]; |
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frame_end = vid->frame.data[0] + vid->frame.linesize[0] * avctx->height; |
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switch(block_type = *buf++) |
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{ |
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case PALETTE_BLOCK: set_palette(&vid->frame, buf); return 0; |
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case VIDEO_YOFFSET_DIFFERENCE_FRAME_BLOCK: |
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yoffset = bytestream_get_le16(&buf); |
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if(yoffset >= avctx->height) { return -1; } |
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destination += vid->frame.linesize[0] * yoffset; |
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} |
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// main code
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while((rle_num_bytes = *buf++)) |
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{ |
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int length = rle_num_bytes & 0x7f; |
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// copy any bytes starting at the current position, and ending at the frame width
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while(length > line_remaining) |
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{ |
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if(rle_num_bytes < 0x80) { bytestream_get_buffer(&buf, destination, line_remaining); } |
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else if(block_type == VIDEO_FULL_FRAME_BLOCK) { memset(destination, buf[0], line_remaining); } |
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length -= line_remaining; // decrement the number of bytes to be copied
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destination += line_remaining + wrap_to_next_line; // skip over extra bytes at end of frame
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line_remaining = avctx->width; |
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if(destination == frame_end) { goto end; } |
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} |
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// copy any remaining bytes after / if line overflows
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if(rle_num_bytes < 0x80) { bytestream_get_buffer(&buf, destination, length); } |
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else if(block_type == VIDEO_FULL_FRAME_BLOCK) { memset(destination, *buf++, length); } |
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line_remaining -= length; |
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destination += length; |
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} |
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end: |
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*data_size = sizeof(AVFrame); |
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*(AVFrame*)data = vid->frame; |
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return buf_size; |
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} |
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static int bethsoftvid_decode_end(AVCodecContext *avctx) |
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{ |
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BethsoftvidContext * vid = avctx->priv_data; |
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av_log(avctx, AV_LOG_DEBUG, "[bethsoftvid video decoder] closing\n"); |
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if(vid->frame.data[0]) { avctx->release_buffer(avctx, &vid->frame); } |
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return 0; |
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} |
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AVCodec bethsoftvid_decoder = { |
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.name = "bethsoftvid", |
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.type = CODEC_TYPE_VIDEO, |
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.id = CODEC_ID_BETHSOFTVID, |
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.priv_data_size = sizeof(BethsoftvidContext), |
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.init = bethsoftvid_decode_init, |
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.close = bethsoftvid_decode_end, |
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.decode = bethsoftvid_decode_frame, |
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}; |
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@ -0,0 +1,9 @@ |
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#define VID_PALETTE_NUMCOLORS 256 |
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enum BethsoftVidBlockType |
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{ |
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PALETTE_BLOCK = 0x02, |
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FIRST_AUDIO_BLOCK = 0x7c, AUDIO_BLOCK = 0x7d, |
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VIDEO_FULL_FRAME_BLOCK = 0x03, VIDEO_DIFFERENCE_FRAME_BLOCK = 0x01, VIDEO_YOFFSET_DIFFERENCE_FRAME_BLOCK = 0x04, |
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FINISHED_BLOCK = 0x14, |
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}; |
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@ -0,0 +1,234 @@ |
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/*
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* Bethsoft VID format Demuxer |
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* Copyright (c) 2007 Nicholas Tung |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/**
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* @file bethsoftvid.c |
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* @brief Bethesda Softworks VID (.vid) file demuxer |
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* @author Nicholas Tung [ntung (at. ntung com] (2007-03) |
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* @sa http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
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* @sa http://www.svatopluk.com/andux/docs/dfvid.html
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*/ |
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#include "avformat.h" |
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#include "bethsoftvideo.h" |
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typedef struct BVID_DemuxContext |
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{ |
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int nframes; |
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/** delay value between frames, added to individual frame delay.
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* custom units, which will be added to other custom units (~=16ms according |
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* to free, unofficial documentation) */ |
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int bethsoft_global_delay; |
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/** video presentation time stamp.
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* delay = 16 milliseconds * (global_delay + per_frame_delay) */ |
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int64_t video_pts; |
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int is_finished; |
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} BVID_DemuxContext; |
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static int vid_probe(AVProbeData *p) |
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{ |
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// little endian VID tag, file starts with "VID\0"
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if (p->buf_size < 4 || AV_RL32(p->buf) != MKTAG('V', 'I', 'D', 0)) |
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return 0; |
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return AVPROBE_SCORE_MAX; |
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} |
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static int vid_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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BVID_DemuxContext *vid = s->priv_data; // permanent data outside of function
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ByteIOContext *pb = &s->pb; // io to file
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AVStream *stream; |
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/* load main header. Contents:
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* bytes: 'V' 'I' 'D' |
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* int16s: always_512, nframes, width, height, delay, always_14 |
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*/ |
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url_fseek(pb, 5, SEEK_CUR); |
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vid->nframes = get_le16(pb); |
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// FFmpeg central code will use this; don't need to return or anything
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// initialize the bethsoft codec
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stream = av_new_stream(s, 0); |
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if (!stream) { return AVERROR_NOMEM; } |
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av_set_pts_info(stream, 32, 1, 60); // 16 ms increments, i.e. 60 fps
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stream->codec->codec_type = CODEC_TYPE_VIDEO; |
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stream->codec->codec_id = CODEC_ID_BETHSOFTVID; |
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stream->codec->width = get_le16(pb); |
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stream->codec->height = get_le16(pb); |
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stream->codec->pix_fmt = PIX_FMT_PAL8; |
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vid->bethsoft_global_delay = get_le16(pb); |
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get_le16(pb); |
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// done with video codec, set up audio codec
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stream = av_new_stream(s, 0); |
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if (!stream) { return AVERROR_NOMEM; } |
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stream->codec->codec_type = CODEC_TYPE_AUDIO; |
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stream->codec->codec_id = CODEC_ID_PCM_U8; |
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stream->codec->channels = 1; |
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stream->codec->sample_rate = 11025; |
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stream->codec->bits_per_sample = 8; |
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stream->codec->bit_rate = stream->codec->channels * stream->codec->sample_rate * stream->codec->bits_per_sample; |
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return 0; |
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} |
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#define BUFFER_PADDING_SIZE 1000 |
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static int read_frame(BVID_DemuxContext *vid, ByteIOContext *pb, AVPacket *pkt, |
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uint8_t block_type, AVFormatContext *s, int npixels) |
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{ |
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uint8_t * vidbuf_start = NULL; |
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int vidbuf_nbytes = 0; |
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int rle_num_bytes; |
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int bytes_copied = 0; |
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int position; |
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size_t vidbuf_capacity; |
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vidbuf_start = av_malloc(vidbuf_capacity = BUFFER_PADDING_SIZE); |
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if(!vidbuf_start) { return AVERROR_NOMEM; } |
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// save the file position for the packet, include block type
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position = url_ftell(pb) - 1; |
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// set the block type for the decoder
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vidbuf_start[vidbuf_nbytes++] = block_type; |
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// get the video delay (next int16), and set the presentation time
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vid->video_pts += vid->bethsoft_global_delay + get_le16(pb); |
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// set the y offset if it exists (decoder header data should be in data section)
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if(block_type == VIDEO_YOFFSET_DIFFERENCE_FRAME_BLOCK) |
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{ |
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if(get_buffer(pb, &vidbuf_start[vidbuf_nbytes], 2) != 2) { return AVERROR_IO; } |
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vidbuf_nbytes += 2; |
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} |
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do |
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{ |
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vidbuf_start = av_fast_realloc(vidbuf_start, &vidbuf_capacity, vidbuf_nbytes + BUFFER_PADDING_SIZE); |
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if(!vidbuf_start) { return AVERROR_NOMEM; } |
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rle_num_bytes = get_byte(pb); |
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vidbuf_start[vidbuf_nbytes++] = rle_num_bytes; |
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if(rle_num_bytes > 0x80) // rle sequence
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{ |
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if(block_type == VIDEO_FULL_FRAME_BLOCK) { vidbuf_start[vidbuf_nbytes++] = get_byte(pb); } |
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bytes_copied += rle_num_bytes - 0x80; |
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} |
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else if(rle_num_bytes) // plain sequence
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{ |
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if(get_buffer(pb, &vidbuf_start[vidbuf_nbytes], rle_num_bytes) != rle_num_bytes) |
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return AVERROR_IO; |
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vidbuf_nbytes += rle_num_bytes; |
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bytes_copied += rle_num_bytes; |
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} |
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if(bytes_copied == npixels) // sometimes no stop character is given, need to keep track of bytes copied
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{ |
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// may contain a 0 byte even if read all pixels
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if(get_byte(pb)) { url_fseek(pb, -1, SEEK_CUR); } |
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break; |
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} |
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if(bytes_copied > npixels) { return -1; } // error
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} while(rle_num_bytes); |
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// copy data into packet
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if(av_new_packet(pkt, vidbuf_nbytes)) { return AVERROR_NOMEM; } |
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memcpy(pkt->data, vidbuf_start, vidbuf_nbytes); |
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av_free(vidbuf_start); |
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pkt->pos = position; |
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pkt->stream_index = 0; // use the video decoder, which was initialized as the first stream
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pkt->pts = vid->video_pts; |
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vid->nframes--; // used to check if all the frames were read
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return vidbuf_nbytes; |
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} |
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static int vid_read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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BVID_DemuxContext *vid = s->priv_data; // permanent data outside of function
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ByteIOContext *pb = &s->pb; // io to file
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unsigned char block_type; // block type
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int audio_length; |
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int ret_value; |
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av_log(s, AV_LOG_DEBUG, "[bethsoftvid demuxer read_packet]"); |
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if(vid->is_finished || url_feof(pb)) { return AVERROR_IO; } |
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block_type = get_byte(pb); |
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switch(block_type) |
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{ |
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case PALETTE_BLOCK: |
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av_log(s, AV_LOG_DEBUG, "palette block.\n"); |
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url_fseek(pb, -1, SEEK_CUR); // include block type
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ret_value = av_get_packet(pb, pkt, 3 * VID_PALETTE_NUMCOLORS + 1); |
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if(ret_value != 3 * VID_PALETTE_NUMCOLORS + 1) { av_free_packet(pkt); return AVERROR_IO; } |
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pkt->stream_index = 0; |
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return ret_value; |
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case FIRST_AUDIO_BLOCK: |
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av_log(s, AV_LOG_DEBUG, "first "); |
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get_le16(pb); // some unused constant
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// soundblaster DAC used for sample rate, as on specification page (link above)
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s->streams[1]->codec->sample_rate = 1000000 / (256 - get_byte(pb)); |
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s->streams[1]->codec->bit_rate = s->streams[1]->codec->channels * s->streams[1]->codec->sample_rate * s->streams[1]->codec->bits_per_sample; |
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case AUDIO_BLOCK: |
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av_log(s, AV_LOG_DEBUG, "audio block.\n"); |
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audio_length = get_le16(pb); |
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ret_value = av_get_packet(pb, pkt, audio_length); |
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pkt->stream_index = 1; |
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return (ret_value != audio_length ? AVERROR_IO : ret_value); |
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case VIDEO_DIFFERENCE_FRAME_BLOCK: av_log(s, AV_LOG_DEBUG, "non-"); |
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case VIDEO_YOFFSET_DIFFERENCE_FRAME_BLOCK: av_log(s, AV_LOG_DEBUG, "offset "); |
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case VIDEO_FULL_FRAME_BLOCK: av_log(s, AV_LOG_DEBUG, "video block.\n"); |
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return read_frame(vid, pb, pkt, block_type, s, |
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s->streams[0]->codec->width * s->streams[0]->codec->height); |
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case FINISHED_BLOCK: |
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if(vid->nframes != 0) |
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av_log(s, AV_LOG_VERBOSE, "reached terminating character but not all frames read.\n"); |
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vid->is_finished = 1; |
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av_log(s, AV_LOG_DEBUG, "terminating block.\n"); |
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|
return AVERROR_IO; |
||||||
|
default: |
||||||
|
av_log(s, AV_LOG_ERROR, "unknown block (character = %c, decimal = %d, hex = %x)!!!\n", |
||||||
|
block_type, block_type, block_type); return -1; |
||||||
|
} |
||||||
|
|
||||||
|
return 0; |
||||||
|
} |
||||||
|
|
||||||
|
AVInputFormat bethsoftvid_demuxer = { |
||||||
|
"bethsoftvid", |
||||||
|
"Bethesda Softworks 'Daggerfall' VID format", |
||||||
|
sizeof(BVID_DemuxContext), |
||||||
|
vid_probe, |
||||||
|
vid_read_header, |
||||||
|
vid_read_packet, |
||||||
|
}; |
||||||
Loading…
Reference in new issue