virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-02 03:06:28 +02:00
Code Issues Releases Activity
0814610ee3
FFmpeg/libavcodec/rpza.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs 
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

300 lines
9.5 KiB
C
Raw Blame History

/*
* Quicktime Video (RPZA) 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
* QT RPZA Video Decoder by Roberto Togni
* For more information about the RPZA format, visit:
* http://www.pcisys.net/~melanson/codecs/
*
* The RPZA decoder outputs RGB555 colorspace data.
*
* Note that this decoder reads big endian RGB555 pixel values from the
* bytestream, arranges them in the host's endian order, and outputs
* them to the final rendered map in the same host endian order. This is
* intended behavior as the libavcodec documentation states that RGB555
* pixels shall be stored in native CPU endianness.
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/internal.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
typedef struct RpzaContext {
AVCodecContext *avctx;
AVFrame *frame;
GetByteContext gb;
} RpzaContext;
#define CHECK_BLOCK() \
if (total_blocks < 1) { \
av_log(s->avctx, AV_LOG_ERROR, \
"Block counter just went negative (this should not happen)\n"); \
return AVERROR_INVALIDDATA; \
} \
#define ADVANCE_BLOCK() \
{ \
pixel_ptr += 4; \
if (pixel_ptr >= width) \
{ \
pixel_ptr = 0; \
row_ptr += stride * 4; \
} \
total_blocks--; \
}
static int rpza_decode_stream(RpzaContext *s)
{
int width = s->avctx->width;
int stride, row_inc, ret;
int chunk_size;
uint16_t colorA = 0, colorB;
uint16_t color4[4];
uint16_t ta, tb;
uint16_t *pixels;
int row_ptr = 0;
int pixel_ptr = 0;
int block_ptr;
int pixel_x, pixel_y;
int total_blocks;
/* First byte is always 0xe1. Warn if it's different */
if (bytestream2_peek_byte(&s->gb) != 0xe1)
av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
bytestream2_peek_byte(&s->gb));
/* Get chunk size, ignoring first byte */
chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
/* If length mismatch use size from MOV file and try to decode anyway */
if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
av_log(s->avctx, AV_LOG_WARNING,
"MOV chunk size %d != encoded chunk size %d\n",
chunk_size,
bytestream2_get_bytes_left(&s->gb) + 4
);
/* Number of 4x4 blocks in frame. */
total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
if (total_blocks / 32 > bytestream2_get_bytes_left(&s->gb))
return AVERROR_INVALIDDATA;
if ((ret = ff_reget_buffer(s->avctx, s->frame, 0)) < 0)
return ret;
pixels = (uint16_t *)s->frame->data[0];
stride = s->frame->linesize[0] / 2;
row_inc = stride - 4;
/* Process chunk data */
while (bytestream2_get_bytes_left(&s->gb)) {
uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
/* If opcode MSbit is 0, we need more data to decide what to do */
if ((opcode & 0x80) == 0) {
colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
opcode = 0;
if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
/* Must behave as opcode 110xxxxx, using colorA computed
* above. Use fake opcode 0x20 to enter switch block at
* the right place */
opcode = 0x20;
n_blocks = 1;
}
}
n_blocks = FFMIN(n_blocks, total_blocks);
switch (opcode & 0xe0) {
/* Skip blocks */
case 0x80:
while (n_blocks--) {
CHECK_BLOCK();
ADVANCE_BLOCK();
}
break;
/* Fill blocks with one color */
case 0xa0:
colorA = bytestream2_get_be16(&s->gb);
while (n_blocks--) {
CHECK_BLOCK();
block_ptr = row_ptr + pixel_ptr;
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
for (pixel_x = 0; pixel_x < 4; pixel_x++){
pixels[block_ptr] = colorA;
block_ptr++;
}
block_ptr += row_inc;
}
ADVANCE_BLOCK();
}
break;
/* Fill blocks with 4 colors */
case 0xc0:
colorA = bytestream2_get_be16(&s->gb);
case 0x20:
colorB = bytestream2_get_be16(&s->gb);
/* sort out the colors */
color4[0] = colorB;
color4[1] = 0;
color4[2] = 0;
color4[3] = colorA;
/* red components */
ta = (colorA >> 10) & 0x1F;
tb = (colorB >> 10) & 0x1F;
color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
/* green components */
ta = (colorA >> 5) & 0x1F;
tb = (colorB >> 5) & 0x1F;
color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
/* blue components */
ta = colorA & 0x1F;
tb = colorB & 0x1F;
color4[1] |= ((11 * ta + 21 * tb) >> 5);
color4[2] |= ((21 * ta + 11 * tb) >> 5);
if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
return AVERROR_INVALIDDATA;
while (n_blocks--) {
CHECK_BLOCK();
block_ptr = row_ptr + pixel_ptr;
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
uint8_t index = bytestream2_get_byteu(&s->gb);
for (pixel_x = 0; pixel_x < 4; pixel_x++){
uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
pixels[block_ptr] = color4[idx];
block_ptr++;
}
block_ptr += row_inc;
}
ADVANCE_BLOCK();
}
break;
/* Fill block with 16 colors */
case 0x00:
if (bytestream2_get_bytes_left(&s->gb) < 30)
return AVERROR_INVALIDDATA;
CHECK_BLOCK();
block_ptr = row_ptr + pixel_ptr;
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
for (pixel_x = 0; pixel_x < 4; pixel_x++){
/* We already have color of upper left pixel */
if ((pixel_y != 0) || (pixel_x != 0))
colorA = bytestream2_get_be16u(&s->gb);
pixels[block_ptr] = colorA;
block_ptr++;
}
block_ptr += row_inc;
}
ADVANCE_BLOCK();
break;
/* Unknown opcode */
default:
av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
" Skip remaining %d bytes of chunk data.\n", opcode,
bytestream2_get_bytes_left(&s->gb));
return AVERROR_INVALIDDATA;
} /* Opcode switch */
}
return 0;
}
static av_cold int rpza_decode_init(AVCodecContext *avctx)
{
RpzaContext *s = avctx->priv_data;
s->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_RGB555;
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
return 0;
}
static int rpza_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
RpzaContext *s = avctx->priv_data;
int ret;
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
ret = rpza_decode_stream(s);
if (ret < 0)
return ret;
if ((ret = av_frame_ref(data, s->frame)) < 0)
return ret;
*got_frame = 1;
/* always report that the buffer was completely consumed */
return avpkt->size;
}
static av_cold int rpza_decode_end(AVCodecContext *avctx)
{
RpzaContext *s = avctx->priv_data;
av_frame_free(&s->frame);
return 0;
}
const AVCodec ff_rpza_decoder = {
.name = "rpza",
.long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_RPZA,
.priv_data_size = sizeof(RpzaContext),
.init = rpza_decode_init,
.close = rpza_decode_end,
.decode = rpza_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};
Reference in New Issue View Git Blame Copy Permalink