mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-23 15:53:08 +00:00
293 lines
8.6 KiB
C
293 lines
8.6 KiB
C
/*
|
|
* 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 rpza.c
|
|
* QT RPZA Video Decoder by Roberto Togni <rtogni@bresciaonline.it>
|
|
* 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 ffmpeg documentation states that RGB555 pixels
|
|
* shall be stored in native CPU endianness.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "common.h"
|
|
#include "avcodec.h"
|
|
#include "dsputil.h"
|
|
|
|
typedef struct RpzaContext {
|
|
|
|
AVCodecContext *avctx;
|
|
DSPContext dsp;
|
|
AVFrame frame;
|
|
|
|
unsigned char *buf;
|
|
int size;
|
|
|
|
} RpzaContext;
|
|
|
|
#define ADVANCE_BLOCK() \
|
|
{ \
|
|
pixel_ptr += 4; \
|
|
if (pixel_ptr >= width) \
|
|
{ \
|
|
pixel_ptr = 0; \
|
|
row_ptr += stride * 4; \
|
|
} \
|
|
total_blocks--; \
|
|
if (total_blocks < 0) \
|
|
{ \
|
|
av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
|
|
return; \
|
|
} \
|
|
}
|
|
|
|
static void rpza_decode_stream(RpzaContext *s)
|
|
{
|
|
int width = s->avctx->width;
|
|
int stride = s->frame.linesize[0] / 2;
|
|
int row_inc = stride - 4;
|
|
int stream_ptr = 0;
|
|
int chunk_size;
|
|
unsigned char opcode;
|
|
int n_blocks;
|
|
unsigned short colorA = 0, colorB;
|
|
unsigned short color4[4];
|
|
unsigned char index, idx;
|
|
unsigned short ta, tb;
|
|
unsigned short *pixels = (unsigned short *)s->frame.data[0];
|
|
|
|
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 (s->buf[stream_ptr] != 0xe1)
|
|
av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
|
|
s->buf[stream_ptr]);
|
|
|
|
/* Get chunk size, ingnoring first byte */
|
|
chunk_size = AV_RB32(&s->buf[stream_ptr]) & 0x00FFFFFF;
|
|
stream_ptr += 4;
|
|
|
|
/* If length mismatch use size from MOV file and try to decode anyway */
|
|
if (chunk_size != s->size)
|
|
av_log(s->avctx, AV_LOG_ERROR, "MOV chunk size != encoded chunk size; using MOV chunk size\n");
|
|
|
|
chunk_size = s->size;
|
|
|
|
/* Number of 4x4 blocks in frame. */
|
|
total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
|
|
|
|
/* Process chunk data */
|
|
while (stream_ptr < chunk_size) {
|
|
opcode = s->buf[stream_ptr++]; /* Get opcode */
|
|
|
|
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) | (s->buf[stream_ptr++]);
|
|
opcode = 0;
|
|
if ((s->buf[stream_ptr] & 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;
|
|
}
|
|
}
|
|
|
|
switch (opcode & 0xe0) {
|
|
|
|
/* Skip blocks */
|
|
case 0x80:
|
|
while (n_blocks--) {
|
|
ADVANCE_BLOCK();
|
|
}
|
|
break;
|
|
|
|
/* Fill blocks with one color */
|
|
case 0xa0:
|
|
colorA = AV_RB16 (&s->buf[stream_ptr]);
|
|
stream_ptr += 2;
|
|
while (n_blocks--) {
|
|
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 = AV_RB16 (&s->buf[stream_ptr]);
|
|
stream_ptr += 2;
|
|
case 0x20:
|
|
colorB = AV_RB16 (&s->buf[stream_ptr]);
|
|
stream_ptr += 2;
|
|
|
|
/* 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);
|
|
|
|
while (n_blocks--) {
|
|
block_ptr = row_ptr + pixel_ptr;
|
|
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
|
|
index = s->buf[stream_ptr++];
|
|
for (pixel_x = 0; pixel_x < 4; pixel_x++){
|
|
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:
|
|
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 = AV_RB16 (&s->buf[stream_ptr]);
|
|
stream_ptr += 2;
|
|
}
|
|
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,
|
|
chunk_size - stream_ptr);
|
|
return;
|
|
} /* Opcode switch */
|
|
}
|
|
}
|
|
|
|
static int rpza_decode_init(AVCodecContext *avctx)
|
|
{
|
|
RpzaContext *s = (RpzaContext *)avctx->priv_data;
|
|
|
|
s->avctx = avctx;
|
|
avctx->pix_fmt = PIX_FMT_RGB555;
|
|
avctx->has_b_frames = 0;
|
|
dsputil_init(&s->dsp, avctx);
|
|
|
|
s->frame.data[0] = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rpza_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
RpzaContext *s = (RpzaContext *)avctx->priv_data;
|
|
|
|
s->buf = buf;
|
|
s->size = buf_size;
|
|
|
|
s->frame.reference = 1;
|
|
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
|
|
if (avctx->reget_buffer(avctx, &s->frame)) {
|
|
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
rpza_decode_stream(s);
|
|
|
|
*data_size = sizeof(AVFrame);
|
|
*(AVFrame*)data = s->frame;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
static int rpza_decode_end(AVCodecContext *avctx)
|
|
{
|
|
RpzaContext *s = (RpzaContext *)avctx->priv_data;
|
|
|
|
if (s->frame.data[0])
|
|
avctx->release_buffer(avctx, &s->frame);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec rpza_decoder = {
|
|
"rpza",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_RPZA,
|
|
sizeof(RpzaContext),
|
|
rpza_decode_init,
|
|
NULL,
|
|
rpza_decode_end,
|
|
rpza_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
};
|