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Diffstat (limited to 'ffmpeg1/libavcodec/vqavideo.c')
-rw-r--r--ffmpeg1/libavcodec/vqavideo.c639
1 files changed, 0 insertions, 639 deletions
diff --git a/ffmpeg1/libavcodec/vqavideo.c b/ffmpeg1/libavcodec/vqavideo.c
deleted file mode 100644
index a47e2db..0000000
--- a/ffmpeg1/libavcodec/vqavideo.c
+++ /dev/null
@@ -1,639 +0,0 @@
-/*
- * Westwood Studios VQA Video Decoder
- * Copyright (C) 2003 the ffmpeg project
- *
- * 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
- * VQA Video Decoder
- * @author Mike Melanson (melanson@pcisys.net)
- * @see http://wiki.multimedia.cx/index.php?title=VQA
- *
- * The VQA video decoder outputs PAL8 or RGB555 colorspace data, depending
- * on the type of data in the file.
- *
- * This decoder needs the 42-byte VQHD header from the beginning
- * of the VQA file passed through the extradata field. The VQHD header
- * is laid out as:
- *
- * bytes 0-3 chunk fourcc: 'VQHD'
- * bytes 4-7 chunk size in big-endian format, should be 0x0000002A
- * bytes 8-49 VQHD chunk data
- *
- * Bytes 8-49 are what this decoder expects to see.
- *
- * Briefly, VQA is a vector quantized animation format that operates in a
- * VGA palettized colorspace. It operates on pixel vectors (blocks)
- * of either 4x2 or 4x4 in size. Compressed VQA chunks can contain vector
- * codebooks, palette information, and code maps for rendering vectors onto
- * frames. Any of these components can also be compressed with a run-length
- * encoding (RLE) algorithm commonly referred to as "format80".
- *
- * VQA takes a novel approach to rate control. Each group of n frames
- * (usually, n = 8) relies on a different vector codebook. Rather than
- * transporting an entire codebook every 8th frame, the new codebook is
- * broken up into 8 pieces and sent along with the compressed video chunks
- * for each of the 8 frames preceding the 8 frames which require the
- * codebook. A full codebook is also sent on the very first frame of a
- * file. This is an interesting technique, although it makes random file
- * seeking difficult despite the fact that the frames are all intracoded.
- *
- * V1,2 VQA uses 12-bit codebook indexes. If the 12-bit indexes were
- * packed into bytes and then RLE compressed, bytewise, the results would
- * be poor. That is why the coding method divides each index into 2 parts,
- * the top 4 bits and the bottom 8 bits, then RL encodes the 4-bit pieces
- * together and the 8-bit pieces together. If most of the vectors are
- * clustered into one group of 256 vectors, most of the 4-bit index pieces
- * should be the same.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "libavutil/intreadwrite.h"
-#include "libavutil/imgutils.h"
-#include "avcodec.h"
-#include "bytestream.h"
-#include "internal.h"
-
-#define PALETTE_COUNT 256
-#define VQA_HEADER_SIZE 0x2A
-
-/* allocate the maximum vector space, regardless of the file version:
- * (0xFF00 codebook vectors + 0x100 solid pixel vectors) * (4x4 pixels/block) */
-#define MAX_CODEBOOK_VECTORS 0xFF00
-#define SOLID_PIXEL_VECTORS 0x100
-#define MAX_VECTORS (MAX_CODEBOOK_VECTORS + SOLID_PIXEL_VECTORS)
-#define MAX_CODEBOOK_SIZE (MAX_VECTORS * 4 * 4)
-
-#define CBF0_TAG MKBETAG('C', 'B', 'F', '0')
-#define CBFZ_TAG MKBETAG('C', 'B', 'F', 'Z')
-#define CBP0_TAG MKBETAG('C', 'B', 'P', '0')
-#define CBPZ_TAG MKBETAG('C', 'B', 'P', 'Z')
-#define CPL0_TAG MKBETAG('C', 'P', 'L', '0')
-#define CPLZ_TAG MKBETAG('C', 'P', 'L', 'Z')
-#define VPTZ_TAG MKBETAG('V', 'P', 'T', 'Z')
-
-typedef struct VqaContext {
-
- AVCodecContext *avctx;
- GetByteContext gb;
-
- uint32_t palette[PALETTE_COUNT];
-
- int width; /* width of a frame */
- int height; /* height of a frame */
- int vector_width; /* width of individual vector */
- int vector_height; /* height of individual vector */
- int vqa_version; /* this should be either 1, 2 or 3 */
-
- unsigned char *codebook; /* the current codebook */
- int codebook_size;
- unsigned char *next_codebook_buffer; /* accumulator for next codebook */
- int next_codebook_buffer_index;
-
- unsigned char *decode_buffer;
- int decode_buffer_size;
-
- /* number of frames to go before replacing codebook */
- int partial_countdown;
- int partial_count;
-
-} VqaContext;
-
-static av_cold int vqa_decode_init(AVCodecContext *avctx)
-{
- VqaContext *s = avctx->priv_data;
- int i, j, codebook_index, ret;
-
- s->avctx = avctx;
- avctx->pix_fmt = AV_PIX_FMT_PAL8;
-
- /* make sure the extradata made it */
- if (s->avctx->extradata_size != VQA_HEADER_SIZE) {
- av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n", VQA_HEADER_SIZE);
- return AVERROR(EINVAL);
- }
-
- /* load up the VQA parameters from the header */
- s->vqa_version = s->avctx->extradata[0];
- if (s->vqa_version < 1 || s->vqa_version > 3) {
- av_log(s->avctx, AV_LOG_ERROR, "unsupported version %d\n", s->vqa_version);
- return AVERROR_PATCHWELCOME;
- }
- s->width = AV_RL16(&s->avctx->extradata[6]);
- s->height = AV_RL16(&s->avctx->extradata[8]);
- if ((ret = av_image_check_size(s->width, s->height, 0, avctx)) < 0) {
- s->width= s->height= 0;
- return ret;
- }
- s->vector_width = s->avctx->extradata[10];
- s->vector_height = s->avctx->extradata[11];
- s->partial_count = s->partial_countdown = s->avctx->extradata[13];
-
- /* the vector dimensions have to meet very stringent requirements */
- if ((s->vector_width != 4) ||
- ((s->vector_height != 2) && (s->vector_height != 4))) {
- /* return without further initialization */
- return AVERROR_INVALIDDATA;
- }
-
- if (s->width % s->vector_width || s->height % s->vector_height) {
- av_log(avctx, AV_LOG_ERROR, "Image size not multiple of block size\n");
- return AVERROR_INVALIDDATA;
- }
-
- /* allocate codebooks */
- s->codebook_size = MAX_CODEBOOK_SIZE;
- s->codebook = av_malloc(s->codebook_size);
- if (!s->codebook)
- goto fail;
- s->next_codebook_buffer = av_malloc(s->codebook_size);
- if (!s->next_codebook_buffer)
- goto fail;
-
- /* allocate decode buffer */
- s->decode_buffer_size = (s->width / s->vector_width) *
- (s->height / s->vector_height) * 2;
- s->decode_buffer = av_malloc(s->decode_buffer_size);
- if (!s->decode_buffer)
- goto fail;
-
- /* initialize the solid-color vectors */
- if (s->vector_height == 4) {
- codebook_index = 0xFF00 * 16;
- for (i = 0; i < 256; i++)
- for (j = 0; j < 16; j++)
- s->codebook[codebook_index++] = i;
- } else {
- codebook_index = 0xF00 * 8;
- for (i = 0; i < 256; i++)
- for (j = 0; j < 8; j++)
- s->codebook[codebook_index++] = i;
- }
- s->next_codebook_buffer_index = 0;
-
- return 0;
-fail:
- av_freep(&s->codebook);
- av_freep(&s->next_codebook_buffer);
- av_freep(&s->decode_buffer);
- return AVERROR(ENOMEM);
-}
-
-#define CHECK_COUNT() \
- if (dest_index + count > dest_size) { \
- av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
- av_log(s->avctx, AV_LOG_ERROR, "current dest_index = %d, count = %d, dest_size = %d\n", \
- dest_index, count, dest_size); \
- return AVERROR_INVALIDDATA; \
- }
-
-#define CHECK_COPY(idx) \
- if (idx < 0 || idx + count > dest_size) { \
- av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: next op would overflow dest_index\n"); \
- av_log(s->avctx, AV_LOG_ERROR, "current src_pos = %d, count = %d, dest_size = %d\n", \
- src_pos, count, dest_size); \
- return AVERROR_INVALIDDATA; \
- }
-
-
-static int decode_format80(VqaContext *s, int src_size,
- unsigned char *dest, int dest_size, int check_size) {
-
- int dest_index = 0;
- int count, opcode, start;
- int src_pos;
- unsigned char color;
- int i;
-
- start = bytestream2_tell(&s->gb);
- while (bytestream2_tell(&s->gb) - start < src_size) {
- opcode = bytestream2_get_byte(&s->gb);
- av_dlog(s->avctx, "opcode %02X: ", opcode);
-
- /* 0x80 means that frame is finished */
- if (opcode == 0x80)
- return 0;
-
- if (dest_index >= dest_size) {
- av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: dest_index (%d) exceeded dest_size (%d)\n",
- dest_index, dest_size);
- return AVERROR_INVALIDDATA;
- }
-
- if (opcode == 0xFF) {
-
- count = bytestream2_get_le16(&s->gb);
- src_pos = bytestream2_get_le16(&s->gb);
- av_dlog(s->avctx, "(1) copy %X bytes from absolute pos %X\n", count, src_pos);
- CHECK_COUNT();
- CHECK_COPY(src_pos);
- for (i = 0; i < count; i++)
- dest[dest_index + i] = dest[src_pos + i];
- dest_index += count;
-
- } else if (opcode == 0xFE) {
-
- count = bytestream2_get_le16(&s->gb);
- color = bytestream2_get_byte(&s->gb);
- av_dlog(s->avctx, "(2) set %X bytes to %02X\n", count, color);
- CHECK_COUNT();
- memset(&dest[dest_index], color, count);
- dest_index += count;
-
- } else if ((opcode & 0xC0) == 0xC0) {
-
- count = (opcode & 0x3F) + 3;
- src_pos = bytestream2_get_le16(&s->gb);
- av_dlog(s->avctx, "(3) copy %X bytes from absolute pos %X\n", count, src_pos);
- CHECK_COUNT();
- CHECK_COPY(src_pos);
- for (i = 0; i < count; i++)
- dest[dest_index + i] = dest[src_pos + i];
- dest_index += count;
-
- } else if (opcode > 0x80) {
-
- count = opcode & 0x3F;
- av_dlog(s->avctx, "(4) copy %X bytes from source to dest\n", count);
- CHECK_COUNT();
- bytestream2_get_buffer(&s->gb, &dest[dest_index], count);
- dest_index += count;
-
- } else {
-
- count = ((opcode & 0x70) >> 4) + 3;
- src_pos = bytestream2_get_byte(&s->gb) | ((opcode & 0x0F) << 8);
- av_dlog(s->avctx, "(5) copy %X bytes from relpos %X\n", count, src_pos);
- CHECK_COUNT();
- CHECK_COPY(dest_index - src_pos);
- for (i = 0; i < count; i++)
- dest[dest_index + i] = dest[dest_index - src_pos + i];
- dest_index += count;
- }
- }
-
- /* validate that the entire destination buffer was filled; this is
- * important for decoding frame maps since each vector needs to have a
- * codebook entry; it is not important for compressed codebooks because
- * not every entry needs to be filled */
- if (check_size)
- if (dest_index < dest_size)
- av_log(s->avctx, AV_LOG_ERROR, "decode_format80 problem: decode finished with dest_index (%d) < dest_size (%d)\n",
- dest_index, dest_size);
-
- return 0; // let's display what we decoded anyway
-}
-
-static int vqa_decode_chunk(VqaContext *s, AVFrame *frame)
-{
- unsigned int chunk_type;
- unsigned int chunk_size;
- int byte_skip;
- unsigned int index = 0;
- int i;
- unsigned char r, g, b;
- int index_shift;
- int res;
-
- int cbf0_chunk = -1;
- int cbfz_chunk = -1;
- int cbp0_chunk = -1;
- int cbpz_chunk = -1;
- int cpl0_chunk = -1;
- int cplz_chunk = -1;
- int vptz_chunk = -1;
-
- int x, y;
- int lines = 0;
- int pixel_ptr;
- int vector_index = 0;
- int lobyte = 0;
- int hibyte = 0;
- int lobytes = 0;
- int hibytes = s->decode_buffer_size / 2;
-
- /* first, traverse through the frame and find the subchunks */
- while (bytestream2_get_bytes_left(&s->gb) >= 8) {
-
- chunk_type = bytestream2_get_be32u(&s->gb);
- index = bytestream2_tell(&s->gb);
- chunk_size = bytestream2_get_be32u(&s->gb);
-
- switch (chunk_type) {
-
- case CBF0_TAG:
- cbf0_chunk = index;
- break;
-
- case CBFZ_TAG:
- cbfz_chunk = index;
- break;
-
- case CBP0_TAG:
- cbp0_chunk = index;
- break;
-
- case CBPZ_TAG:
- cbpz_chunk = index;
- break;
-
- case CPL0_TAG:
- cpl0_chunk = index;
- break;
-
- case CPLZ_TAG:
- cplz_chunk = index;
- break;
-
- case VPTZ_TAG:
- vptz_chunk = index;
- break;
-
- default:
- av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %c%c%c%c (%08X)\n",
- (chunk_type >> 24) & 0xFF,
- (chunk_type >> 16) & 0xFF,
- (chunk_type >> 8) & 0xFF,
- (chunk_type >> 0) & 0xFF,
- chunk_type);
- break;
- }
-
- byte_skip = chunk_size & 0x01;
- bytestream2_skip(&s->gb, chunk_size + byte_skip);
- }
-
- /* next, deal with the palette */
- if ((cpl0_chunk != -1) && (cplz_chunk != -1)) {
-
- /* a chunk should not have both chunk types */
- av_log(s->avctx, AV_LOG_ERROR, "problem: found both CPL0 and CPLZ chunks\n");
- return AVERROR_INVALIDDATA;
- }
-
- /* decompress the palette chunk */
- if (cplz_chunk != -1) {
-
-/* yet to be handled */
-
- }
-
- /* convert the RGB palette into the machine's endian format */
- if (cpl0_chunk != -1) {
-
- bytestream2_seek(&s->gb, cpl0_chunk, SEEK_SET);
- chunk_size = bytestream2_get_be32(&s->gb);
- /* sanity check the palette size */
- if (chunk_size / 3 > 256 || chunk_size > bytestream2_get_bytes_left(&s->gb)) {
- av_log(s->avctx, AV_LOG_ERROR, "problem: found a palette chunk with %d colors\n",
- chunk_size / 3);
- return AVERROR_INVALIDDATA;
- }
- for (i = 0; i < chunk_size / 3; i++) {
- /* scale by 4 to transform 6-bit palette -> 8-bit */
- r = bytestream2_get_byteu(&s->gb) * 4;
- g = bytestream2_get_byteu(&s->gb) * 4;
- b = bytestream2_get_byteu(&s->gb) * 4;
- s->palette[i] = 0xFFU << 24 | r << 16 | g << 8 | b;
- s->palette[i] |= s->palette[i] >> 6 & 0x30303;
- }
- }
-
- /* next, look for a full codebook */
- if ((cbf0_chunk != -1) && (cbfz_chunk != -1)) {
-
- /* a chunk should not have both chunk types */
- av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBF0 and CBFZ chunks\n");
- return AVERROR_INVALIDDATA;
- }
-
- /* decompress the full codebook chunk */
- if (cbfz_chunk != -1) {
-
- bytestream2_seek(&s->gb, cbfz_chunk, SEEK_SET);
- chunk_size = bytestream2_get_be32(&s->gb);
- if ((res = decode_format80(s, chunk_size, s->codebook,
- s->codebook_size, 0)) < 0)
- return res;
- }
-
- /* copy a full codebook */
- if (cbf0_chunk != -1) {
-
- bytestream2_seek(&s->gb, cbf0_chunk, SEEK_SET);
- chunk_size = bytestream2_get_be32(&s->gb);
- /* sanity check the full codebook size */
- if (chunk_size > MAX_CODEBOOK_SIZE) {
- av_log(s->avctx, AV_LOG_ERROR, "problem: CBF0 chunk too large (0x%X bytes)\n",
- chunk_size);
- return AVERROR_INVALIDDATA;
- }
-
- bytestream2_get_buffer(&s->gb, s->codebook, chunk_size);
- }
-
- /* decode the frame */
- if (vptz_chunk == -1) {
-
- /* something is wrong if there is no VPTZ chunk */
- av_log(s->avctx, AV_LOG_ERROR, "problem: no VPTZ chunk found\n");
- return AVERROR_INVALIDDATA;
- }
-
- bytestream2_seek(&s->gb, vptz_chunk, SEEK_SET);
- chunk_size = bytestream2_get_be32(&s->gb);
- if ((res = decode_format80(s, chunk_size,
- s->decode_buffer, s->decode_buffer_size, 1)) < 0)
- return res;
-
- /* render the final PAL8 frame */
- if (s->vector_height == 4)
- index_shift = 4;
- else
- index_shift = 3;
- for (y = 0; y < s->height; y += s->vector_height) {
- for (x = 0; x < s->width; x += 4, lobytes++, hibytes++) {
- pixel_ptr = y * frame->linesize[0] + x;
-
- /* get the vector index, the method for which varies according to
- * VQA file version */
- switch (s->vqa_version) {
-
- case 1:
- lobyte = s->decode_buffer[lobytes * 2];
- hibyte = s->decode_buffer[(lobytes * 2) + 1];
- vector_index = ((hibyte << 8) | lobyte) >> 3;
- vector_index <<= index_shift;
- lines = s->vector_height;
- /* uniform color fill - a quick hack */
- if (hibyte == 0xFF) {
- while (lines--) {
- frame->data[0][pixel_ptr + 0] = 255 - lobyte;
- frame->data[0][pixel_ptr + 1] = 255 - lobyte;
- frame->data[0][pixel_ptr + 2] = 255 - lobyte;
- frame->data[0][pixel_ptr + 3] = 255 - lobyte;
- pixel_ptr += frame->linesize[0];
- }
- lines=0;
- }
- break;
-
- case 2:
- lobyte = s->decode_buffer[lobytes];
- hibyte = s->decode_buffer[hibytes];
- vector_index = (hibyte << 8) | lobyte;
- vector_index <<= index_shift;
- lines = s->vector_height;
- break;
-
- case 3:
-/* not implemented yet */
- lines = 0;
- break;
- }
-
- while (lines--) {
- frame->data[0][pixel_ptr + 0] = s->codebook[vector_index++];
- frame->data[0][pixel_ptr + 1] = s->codebook[vector_index++];
- frame->data[0][pixel_ptr + 2] = s->codebook[vector_index++];
- frame->data[0][pixel_ptr + 3] = s->codebook[vector_index++];
- pixel_ptr += frame->linesize[0];
- }
- }
- }
-
- /* handle partial codebook */
- if ((cbp0_chunk != -1) && (cbpz_chunk != -1)) {
- /* a chunk should not have both chunk types */
- av_log(s->avctx, AV_LOG_ERROR, "problem: found both CBP0 and CBPZ chunks\n");
- return AVERROR_INVALIDDATA;
- }
-
- if (cbp0_chunk != -1) {
-
- bytestream2_seek(&s->gb, cbp0_chunk, SEEK_SET);
- chunk_size = bytestream2_get_be32(&s->gb);
-
- if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
- av_log(s->avctx, AV_LOG_ERROR, "cbp0 chunk too large (%u bytes)\n",
- chunk_size);
- return AVERROR_INVALIDDATA;
- }
-
- /* accumulate partial codebook */
- bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
- chunk_size);
- s->next_codebook_buffer_index += chunk_size;
-
- s->partial_countdown--;
- if (s->partial_countdown <= 0) {
-
- /* time to replace codebook */
- memcpy(s->codebook, s->next_codebook_buffer,
- s->next_codebook_buffer_index);
-
- /* reset accounting */
- s->next_codebook_buffer_index = 0;
- s->partial_countdown = s->partial_count;
- }
- }
-
- if (cbpz_chunk != -1) {
-
- bytestream2_seek(&s->gb, cbpz_chunk, SEEK_SET);
- chunk_size = bytestream2_get_be32(&s->gb);
-
- if (chunk_size > MAX_CODEBOOK_SIZE - s->next_codebook_buffer_index) {
- av_log(s->avctx, AV_LOG_ERROR, "cbpz chunk too large (%u bytes)\n",
- chunk_size);
- return AVERROR_INVALIDDATA;
- }
-
- /* accumulate partial codebook */
- bytestream2_get_buffer(&s->gb, &s->next_codebook_buffer[s->next_codebook_buffer_index],
- chunk_size);
- s->next_codebook_buffer_index += chunk_size;
-
- s->partial_countdown--;
- if (s->partial_countdown <= 0) {
- bytestream2_init(&s->gb, s->next_codebook_buffer, s->next_codebook_buffer_index);
- /* decompress codebook */
- if ((res = decode_format80(s, s->next_codebook_buffer_index,
- s->codebook, s->codebook_size, 0)) < 0)
- return res;
-
- /* reset accounting */
- s->next_codebook_buffer_index = 0;
- s->partial_countdown = s->partial_count;
- }
- }
-
- return 0;
-}
-
-static int vqa_decode_frame(AVCodecContext *avctx,
- void *data, int *got_frame,
- AVPacket *avpkt)
-{
- VqaContext *s = avctx->priv_data;
- AVFrame *frame = data;
- int res;
-
- if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
- return res;
-
- bytestream2_init(&s->gb, avpkt->data, avpkt->size);
- if ((res = vqa_decode_chunk(s, frame)) < 0)
- return res;
-
- /* make the palette available on the way out */
- memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
- frame->palette_has_changed = 1;
-
- *got_frame = 1;
-
- /* report that the buffer was completely consumed */
- return avpkt->size;
-}
-
-static av_cold int vqa_decode_end(AVCodecContext *avctx)
-{
- VqaContext *s = avctx->priv_data;
-
- av_freep(&s->codebook);
- av_freep(&s->next_codebook_buffer);
- av_freep(&s->decode_buffer);
-
- return 0;
-}
-
-AVCodec ff_vqa_decoder = {
- .name = "vqavideo",
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_WS_VQA,
- .priv_data_size = sizeof(VqaContext),
- .init = vqa_decode_init,
- .close = vqa_decode_end,
- .decode = vqa_decode_frame,
- .capabilities = CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 16:47:43 +0000