virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-26 19:01:44 +02:00
Code Issues Releases Activity
5dcedfcd17
FFmpeg/libavcodec/vqavideo.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

862 lines
29 KiB
C
Raw Blame History

/*
* Westwood Studios VQA Video Decoder
* Copyright (c) 2003 Mike Melanson <melanson@pcisys.net>
* Copyright (c) 2021 Pekka Väänänen <pekka.vaananen@iki.fi>
*
* 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.
*
* VQA3 introduces a 15-bit high color codebook, delta coding, replaces
* the above "split byte" scheme with RLE compression, and extends the
* "format80" compression with relative references. In VQA3 the whole
* codebook is always updated as a whole without splitting it into pieces.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.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 * sizeof(uint16_t))
#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')
#define VPTR_TAG MKBETAG('V', 'P', 'T', 'R')
#define VPRZ_TAG MKBETAG('V', 'P', 'R', 'Z')
typedef struct VqaContext {
AVFrame *frame;
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;
int colors;
s->avctx = avctx;
/* 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) {
avpriv_request_sample(avctx, "VQA Version %i", s->vqa_version);
return AVERROR_INVALIDDATA;
}
s->width = AV_RL16(&s->avctx->extradata[6]);
s->height = AV_RL16(&s->avctx->extradata[8]);
if ((ret = ff_set_dimensions(avctx, s->width, s->height)) < 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];
colors = (s->avctx->extradata[14] << 8) | s->avctx->extradata[15];
if (colors > 0) {
avctx->pix_fmt = AV_PIX_FMT_PAL8;
} else {
avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
}
/* 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;
}
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
/* allocate codebooks */
s->codebook_size = MAX_CODEBOOK_SIZE;
s->codebook = av_malloc(s->codebook_size);
if (!s->codebook)
return AVERROR(ENOMEM);
s->next_codebook_buffer = av_malloc(s->codebook_size);
if (!s->next_codebook_buffer)
return AVERROR(ENOMEM);
/* allocate decode buffer */
s->decode_buffer_size = (s->width / s->vector_width) *
(s->height / s->vector_height) * 2;
s->decode_buffer = av_mallocz(s->decode_buffer_size);
if (!s->decode_buffer)
return AVERROR(ENOMEM);
/* 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;
}
#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;
int relative = 0;
if (src_size < 0 || src_size > bytestream2_get_bytes_left(&s->gb)) {
av_log(s->avctx, AV_LOG_ERROR, "Chunk size %d is out of range\n",
src_size);
return AVERROR_INVALIDDATA;
}
/* the "new" scheme makes references relative to destination pointer */
if (bytestream2_peek_byte(&s->gb) == 0x00) {
relative = 1;
bytestream2_get_byte(&s->gb);
ff_tlog(s->avctx, "found new format stream ");
}
start = bytestream2_tell(&s->gb);
while (bytestream2_tell(&s->gb) - start < src_size) {
opcode = bytestream2_get_byte(&s->gb);
ff_tlog(s->avctx, "opcode %02X: ", opcode);
/* 0x80 means that frame is finished */
if (opcode == 0x80)
break;
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);
if (relative)
src_pos = dest_index - src_pos;
ff_tlog(s->avctx, "(1) copy %X bytes from 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);
ff_tlog(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);
if (relative)
src_pos = dest_index - src_pos;
ff_tlog(s->avctx, "(3) copy %X bytes from 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;
ff_tlog(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);
ff_tlog(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);
memset(dest + dest_index, 0, dest_size - dest_index);
}
return 0; // let's display what we decoded anyway
}
static int vqa_decode_frame_pal8(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: %s (%08X)\n",
av_fourcc2str(av_bswap32(chunk_type)), 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:
av_log(s->avctx, AV_LOG_ERROR, "VQA3 shouldn't have a color palette");
return AVERROR_INVALIDDATA;
}
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 */
res = decode_format80(s, s->next_codebook_buffer_index,
s->codebook, s->codebook_size, 0);
/* reset accounting */
s->next_codebook_buffer_index = 0;
s->partial_countdown = s->partial_count;
if (res < 0)
return res;
}
}
return 0;
}
static int vqa_decode_frame_hicolor(VqaContext *s, AVFrame *frame)
{
unsigned int chunk_type;
unsigned int chunk_size;
unsigned int index = 0;
int res;
int cbf0_chunk = -1;
int cbfz_chunk = -1;
int vptr_chunk = -1;
int vprz_chunk = -1;
GetByteContext gb_stream;
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 VPTR_TAG:
vptr_chunk = index;
break;
case VPRZ_TAG:
vprz_chunk = index;
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "Found unknown chunk type: %s (%08X)\n",
av_fourcc2str(av_bswap32(chunk_type)), chunk_type);
break;
}
bytestream2_skip(&s->gb, chunk_size + (chunk_size & 0x01));
}
/* 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 (vptr_chunk != -1) {
/* copy uncompressed tile data */
bytestream2_seek(&s->gb, vptr_chunk, SEEK_SET);
chunk_size = bytestream2_get_be32(&s->gb);
if (chunk_size > s->decode_buffer_size) {
av_log(s->avctx, AV_LOG_ERROR, "VPTR chunk didn't fit in decode buffer");
return AVERROR_INVALIDDATA;
}
bytestream2_get_buffer(&s->gb, s->decode_buffer, chunk_size);
} else if (vprz_chunk != -1) {
/* decompress the tile data */
bytestream2_seek(&s->gb, vprz_chunk, SEEK_SET);
chunk_size = bytestream2_get_be32(&s->gb);
if ((res = decode_format80(s, chunk_size, s->decode_buffer, s->decode_buffer_size, 0)) < 0)
return res;
} else {
av_log(s->avctx, AV_LOG_ERROR, "frame has no block data\n");
return AVERROR_INVALIDDATA;
}
/* now uncompress the per-row RLE of the decode buffer and draw the blocks in framebuffer */
bytestream2_init(&gb_stream, s->decode_buffer, s->decode_buffer_size);
for (int y_pos = 0; y_pos < s->height; y_pos += s->vector_height) {
int x_pos = 0;
while (x_pos < s->width) {
int vector_index = 0;
int count = 0;
uint16_t code;
int type;
if (bytestream2_get_bytes_left(&gb_stream) < 2)
return AVERROR_INVALIDDATA;
code = bytestream2_get_le16(&gb_stream);
type = code >> 13;
code &= 0x1fff;
if (type == 0) {
x_pos += 4 * code;
continue;
} else if (type < 3) {
vector_index = code & 0xff;
count = ((code & 0x1f00) >> 7) + 1 + type;
} else if (type < 5) {
vector_index = code;
count = 1;
} else if (type < 7) {
vector_index = code;
count = bytestream2_get_byte(&gb_stream);
} else {
av_log(s->avctx, AV_LOG_ERROR, " unknown type in VPTR chunk (%d)\n",type);
return AVERROR_INVALIDDATA;
}
if (count < 0 || count > (s->width - x_pos) / s->vector_width) {
av_log(s->avctx, AV_LOG_ERROR, "invalid count: %d\n", count);
return AVERROR_INVALIDDATA;
}
while (count-- && x_pos < s->width) {
const int bytes_per_vector = 4 * s->vector_height * sizeof(uint16_t);
unsigned char *src = s->codebook + vector_index * bytes_per_vector;
unsigned char *dst = s->frame->data[0] + y_pos * s->frame->linesize[0]
+ sizeof(uint16_t) * x_pos;
if (vector_index >= MAX_VECTORS)
return AVERROR_INVALIDDATA;
for (int y = 0; y < s->vector_height; y++) {
int size = 4 * sizeof(uint16_t);
memcpy(dst, src, size);
dst += s->frame->linesize[0];
src += size;
}
/* we might want to read the next block index from stream */
if ((type == 2) && count > 0) {
vector_index = bytestream2_get_byte(&gb_stream);
}
x_pos += 4;
}
if (count > 0) {
av_log(s->avctx, AV_LOG_ERROR, "had %d leftover vectors\n", count);
return AVERROR_BUG;
}
}
}
return 0;
}
static int vqa_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
VqaContext *s = avctx->priv_data;
int res;
if ((res = ff_reget_buffer(avctx, s->frame, 0)) < 0)
return res;
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
if ((res = vqa_decode_frame_pal8(s, s->frame)) < 0)
return res;
/* make the palette available on the way out */
memcpy(s->frame->data[1], s->palette, PALETTE_COUNT * 4);
s->frame->palette_has_changed = 1;
} else if (avctx->pix_fmt == AV_PIX_FMT_RGB555LE) {
if ((res = vqa_decode_frame_hicolor(s, s->frame)) < 0)
return res;
} else {
av_log(s->avctx, AV_LOG_ERROR, "unsupported pixel format\n");
return AVERROR_BUG;
}
if ((res = av_frame_ref(rframe, s->frame)) < 0)
return res;
*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_frame_free(&s->frame);
av_freep(&s->codebook);
av_freep(&s->next_codebook_buffer);
av_freep(&s->decode_buffer);
return 0;
}
static const FFCodecDefault vqa_defaults[] = {
{ "max_pixels", "640*480" },
{ NULL },
};
const FFCodec ff_vqa_decoder = {
.p.name = "vqavideo",
.p.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios VQA (Vector Quantized Animation) video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_WS_VQA,
.priv_data_size = sizeof(VqaContext),
.init = vqa_decode_init,
.close = vqa_decode_end,
FF_CODEC_DECODE_CB(vqa_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.defaults = vqa_defaults,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
Reference in New Issue View Git Blame Copy Permalink