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support for Tiertex .seq files demuxing/video decoding, by Gregory Mo…
…ntoir %cyx A users P sourceforge P net% git-svn-id: file:///var/local/repositories/ffmpeg/trunk@6672 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b
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Oct 12, 2006
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,232 @@ | ||
| /* | ||
| * Tiertex Limited SEQ Video Decoder | ||
| * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net) | ||
| * | ||
| * 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 | ||
| */ | ||
|
|
||
| /** | ||
| * @file tiertexseqv.c | ||
| * Tiertex Limited SEQ video decoder | ||
| */ | ||
|
|
||
| #include "avcodec.h" | ||
| #include "common.h" | ||
| #define ALT_BITSTREAM_READER_LE | ||
| #include "bitstream.h" | ||
|
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|
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| typedef struct SeqVideoContext { | ||
| AVCodecContext *avctx; | ||
| AVFrame frame; | ||
| unsigned int palette[256]; | ||
| unsigned char block[8 * 8]; | ||
| } SeqVideoContext; | ||
|
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|
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| static unsigned char *seq_unpack_rle_block(unsigned char *src, unsigned char *dst, int dst_size) | ||
| { | ||
| int i, len, sz; | ||
| GetBitContext gb; | ||
| int code_table[64]; | ||
|
|
||
| /* get the rle codes (at most 64 bytes) */ | ||
| init_get_bits(&gb, src, 64 * 8); | ||
| for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) { | ||
| code_table[i] = get_sbits(&gb, 4); | ||
| sz += FFABS(code_table[i]); | ||
| } | ||
| src += (get_bits_count(&gb) + 7) / 8; | ||
|
|
||
| /* do the rle unpacking */ | ||
| for (i = 0; i < 64 && dst_size > 0; i++) { | ||
| len = code_table[i]; | ||
| if (len < 0) { | ||
| len = -len; | ||
| memset(dst, *src++, FFMIN(len, dst_size)); | ||
| } else { | ||
| memcpy(dst, src, FFMIN(len, dst_size)); | ||
| src += len; | ||
| } | ||
| dst += len; | ||
| dst_size -= len; | ||
| } | ||
| return src; | ||
| } | ||
|
|
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| static unsigned char *seq_decode_op1(SeqVideoContext *seq, unsigned char *src, unsigned char *dst) | ||
| { | ||
| unsigned char *color_table; | ||
| int b, i, len, bits; | ||
| GetBitContext gb; | ||
|
|
||
| len = *src++; | ||
| if (len & 0x80) { | ||
| switch (len & 3) { | ||
| case 1: | ||
| src = seq_unpack_rle_block(src, seq->block, sizeof(seq->block)); | ||
| for (b = 0; b < 8; b++) { | ||
| memcpy(dst, &seq->block[b * 8], 8); | ||
| dst += seq->frame.linesize[0]; | ||
| } | ||
| break; | ||
| case 2: | ||
| src = seq_unpack_rle_block(src, seq->block, sizeof(seq->block)); | ||
| for (i = 0; i < 8; i++) { | ||
| for (b = 0; b < 8; b++) | ||
| dst[b * seq->frame.linesize[0]] = seq->block[i * 8 + b]; | ||
| ++dst; | ||
| } | ||
| break; | ||
| } | ||
| } else { | ||
| color_table = src; | ||
| src += len; | ||
| bits = ff_log2_tab[len - 1] + 1; | ||
| init_get_bits(&gb, src, bits * 8 * 8); src += bits * 8; | ||
| for (b = 0; b < 8; b++) { | ||
| for (i = 0; i < 8; i++) | ||
| dst[i] = color_table[get_bits(&gb, bits)]; | ||
| dst += seq->frame.linesize[0]; | ||
| } | ||
| } | ||
|
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| return src; | ||
| } | ||
|
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| static unsigned char *seq_decode_op2(SeqVideoContext *seq, unsigned char *src, unsigned char *dst) | ||
| { | ||
| int i; | ||
|
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| for (i = 0; i < 8; i++) { | ||
| memcpy(dst, src, 8); | ||
| src += 8; | ||
| dst += seq->frame.linesize[0]; | ||
| } | ||
|
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| return src; | ||
| } | ||
|
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| static unsigned char *seq_decode_op3(SeqVideoContext *seq, unsigned char *src, unsigned char *dst) | ||
| { | ||
| int pos, offset; | ||
|
|
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| do { | ||
| pos = *src++; | ||
| offset = ((pos >> 3) & 7) * seq->frame.linesize[0] + (pos & 7); | ||
| dst[offset] = *src++; | ||
| } while (!(pos & 0x80)); | ||
|
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| return src; | ||
| } | ||
|
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| static void seqvideo_decode(SeqVideoContext *seq, unsigned char *data, int data_size) | ||
| { | ||
| GetBitContext gb; | ||
| int flags, i, j, x, y, op; | ||
| unsigned char c[3]; | ||
| unsigned char *dst; | ||
|
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| flags = *data++; | ||
|
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| if (flags & 1) { | ||
| for (i = 0; i < 256; i++) { | ||
| for (j = 0; j < 3; j++, data++) | ||
| c[j] = (*data << 2) | (*data >> 4); | ||
| seq->palette[i] = (c[0] << 16) | (c[1] << 8) | c[2]; | ||
| } | ||
| memcpy(seq->frame.data[1], seq->palette, sizeof(seq->palette)); | ||
| seq->frame.palette_has_changed = 1; | ||
| } | ||
|
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| if (flags & 2) { | ||
| init_get_bits(&gb, data, 128 * 8); data += 128; | ||
| for (y = 0; y < 128; y += 8) | ||
| for (x = 0; x < 256; x += 8) { | ||
| dst = &seq->frame.data[0][y * seq->frame.linesize[0] + x]; | ||
| op = get_bits(&gb, 2); | ||
| switch (op) { | ||
| case 1: | ||
| data = seq_decode_op1(seq, data, dst); | ||
| break; | ||
| case 2: | ||
| data = seq_decode_op2(seq, data, dst); | ||
| break; | ||
| case 3: | ||
| data = seq_decode_op3(seq, data, dst); | ||
| break; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| static int seqvideo_decode_init(AVCodecContext *avctx) | ||
| { | ||
| SeqVideoContext *seq = (SeqVideoContext *)avctx->priv_data; | ||
|
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| seq->avctx = avctx; | ||
| avctx->pix_fmt = PIX_FMT_PAL8; | ||
| avctx->has_b_frames = 0; | ||
|
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| seq->frame.data[0] = NULL; | ||
|
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| return 0; | ||
| } | ||
|
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| static int seqvideo_decode_frame(AVCodecContext *avctx, | ||
| void *data, int *data_size, | ||
| uint8_t *buf, int buf_size) | ||
| { | ||
|
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| SeqVideoContext *seq = (SeqVideoContext *)avctx->priv_data; | ||
|
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| seq->frame.reference = 1; | ||
| seq->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; | ||
| if (avctx->reget_buffer(avctx, &seq->frame)) { | ||
| av_log(seq->avctx, AV_LOG_ERROR, "tiertexseqvideo: reget_buffer() failed\n"); | ||
| return -1; | ||
| } | ||
|
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| seqvideo_decode(seq, buf, buf_size); | ||
|
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| *data_size = sizeof(AVFrame); | ||
| *(AVFrame *)data = seq->frame; | ||
|
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| return buf_size; | ||
| } | ||
|
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| static int seqvideo_decode_end(AVCodecContext *avctx) | ||
| { | ||
| SeqVideoContext *seq = (SeqVideoContext *)avctx->priv_data; | ||
|
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| if (seq->frame.data[0]) | ||
| avctx->release_buffer(avctx, &seq->frame); | ||
|
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| return 0; | ||
| } | ||
|
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| AVCodec tiertexseqvideo_decoder = { | ||
| "tiertexseqvideo", | ||
| CODEC_TYPE_VIDEO, | ||
| CODEC_ID_TIERTEXSEQVIDEO, | ||
| sizeof(SeqVideoContext), | ||
| seqvideo_decode_init, | ||
| NULL, | ||
| seqvideo_decode_end, | ||
| seqvideo_decode_frame, | ||
| CODEC_CAP_DR1, | ||
| }; |
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