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FFmpeg/libavcodec/qtrle.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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/*
* Quicktime Animation (RLE) Video Decoder
* Copyright (C) 2004 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 RLE Video Decoder by Mike Melanson (melanson@pcisys.net)
* For more information about the QT RLE format, visit:
* http://www.pcisys.net/~melanson/codecs/
*
* The QT RLE decoder has seven modes of operation:
* 1, 2, 4, 8, 16, 24, and 32 bits per pixel. For modes 1, 2, 4, and 8
* the decoder outputs PAL8 colorspace data. 16-bit data yields RGB555
* data. 24-bit data is RGB24 and 32-bit data is RGB32.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "decode.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "internal.h"
typedef struct QtrleContext {
AVCodecContext *avctx;
AVFrame *frame;
GetByteContext g;
uint32_t pal[256];
} QtrleContext;
#define CHECK_PIXEL_PTR(n) \
if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \
av_log (s->avctx, AV_LOG_ERROR, "Problem: pixel_ptr = %d, pixel_limit = %d\n",\
pixel_ptr + n, pixel_limit); \
return; \
} \
static void qtrle_decode_1bpp(QtrleContext *s, int row_ptr, int lines_to_change)
{
int rle_code;
int pixel_ptr;
int row_inc = s->frame->linesize[0];
uint8_t pi0, pi1; /* 2 8-pixel values */
uint8_t *rgb = s->frame->data[0];
int pixel_limit = s->frame->linesize[0] * s->avctx->height;
int skip;
/* skip & 0x80 appears to mean 'start a new line', which can be interpreted
* as 'go to next line' during the decoding of a frame but is 'go to first
* line' at the beginning. Since we always interpret it as 'go to next line'
* in the decoding loop (which makes code simpler/faster), the first line
* would not be counted, so we count one more.
* See: https://trac.ffmpeg.org/ticket/226
* In the following decoding loop, row_ptr will be the position of the
* current row. */
row_ptr -= row_inc;
pixel_ptr = row_ptr;
lines_to_change++;
while (lines_to_change) {
skip = bytestream2_get_byte(&s->g);
rle_code = (int8_t)bytestream2_get_byte(&s->g);
if (rle_code == 0)
break;
if(skip & 0x80) {
lines_to_change--;
row_ptr += row_inc;
pixel_ptr = row_ptr + 2 * 8 * (skip & 0x7f);
} else
pixel_ptr += 2 * 8 * skip;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
if(rle_code == -1)
continue;
if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
/* get the next 2 bytes from the stream, treat them as groups
* of 8 pixels, and output them rle_code times */
pi0 = bytestream2_get_byte(&s->g);
pi1 = bytestream2_get_byte(&s->g);
CHECK_PIXEL_PTR(rle_code * 2 * 8);
while (rle_code--) {
rgb[pixel_ptr++] = (pi0 >> 7) & 0x01;
rgb[pixel_ptr++] = (pi0 >> 6) & 0x01;
rgb[pixel_ptr++] = (pi0 >> 5) & 0x01;
rgb[pixel_ptr++] = (pi0 >> 4) & 0x01;
rgb[pixel_ptr++] = (pi0 >> 3) & 0x01;
rgb[pixel_ptr++] = (pi0 >> 2) & 0x01;
rgb[pixel_ptr++] = (pi0 >> 1) & 0x01;
rgb[pixel_ptr++] = pi0 & 0x01;
rgb[pixel_ptr++] = (pi1 >> 7) & 0x01;
rgb[pixel_ptr++] = (pi1 >> 6) & 0x01;
rgb[pixel_ptr++] = (pi1 >> 5) & 0x01;
rgb[pixel_ptr++] = (pi1 >> 4) & 0x01;
rgb[pixel_ptr++] = (pi1 >> 3) & 0x01;
rgb[pixel_ptr++] = (pi1 >> 2) & 0x01;
rgb[pixel_ptr++] = (pi1 >> 1) & 0x01;
rgb[pixel_ptr++] = pi1 & 0x01;
}
} else {
/* copy the same pixel directly to output 2 times */
rle_code *= 2;
CHECK_PIXEL_PTR(rle_code * 8);
while (rle_code--) {
int x = bytestream2_get_byte(&s->g);
rgb[pixel_ptr++] = (x >> 7) & 0x01;
rgb[pixel_ptr++] = (x >> 6) & 0x01;
rgb[pixel_ptr++] = (x >> 5) & 0x01;
rgb[pixel_ptr++] = (x >> 4) & 0x01;
rgb[pixel_ptr++] = (x >> 3) & 0x01;
rgb[pixel_ptr++] = (x >> 2) & 0x01;
rgb[pixel_ptr++] = (x >> 1) & 0x01;
rgb[pixel_ptr++] = x & 0x01;
}
}
}
}
static inline void qtrle_decode_2n4bpp(QtrleContext *s, int row_ptr,
int lines_to_change, int bpp)
{
int rle_code, i;
int pixel_ptr;
int row_inc = s->frame->linesize[0];
uint8_t pi[16]; /* 16 palette indices */
uint8_t *rgb = s->frame->data[0];
int pixel_limit = s->frame->linesize[0] * s->avctx->height;
int num_pixels = (bpp == 4) ? 8 : 16;
while (lines_to_change--) {
pixel_ptr = row_ptr + (num_pixels * (bytestream2_get_byte(&s->g) - 1));
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (num_pixels * (bytestream2_get_byte(&s->g) - 1));
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
/* get the next 4 bytes from the stream, treat them as palette
* indexes, and output them rle_code times */
for (i = num_pixels-1; i >= 0; i--) {
pi[num_pixels-1-i] = (bytestream2_peek_byte(&s->g) >> ((i*bpp) & 0x07)) & ((1<<bpp)-1);
bytestream2_skip(&s->g, ((i & ((num_pixels>>2)-1)) == 0));
}
CHECK_PIXEL_PTR(rle_code * num_pixels);
while (rle_code--) {
memcpy(&rgb[pixel_ptr], &pi, num_pixels);
pixel_ptr += num_pixels;
}
} else {
/* copy the same pixel directly to output 4 times */
rle_code *= 4;
CHECK_PIXEL_PTR(rle_code*(num_pixels>>2));
while (rle_code--) {
if(bpp == 4) {
int x = bytestream2_get_byte(&s->g);
rgb[pixel_ptr++] = (x >> 4) & 0x0f;
rgb[pixel_ptr++] = x & 0x0f;
} else {
int x = bytestream2_get_byte(&s->g);
rgb[pixel_ptr++] = (x >> 6) & 0x03;
rgb[pixel_ptr++] = (x >> 4) & 0x03;
rgb[pixel_ptr++] = (x >> 2) & 0x03;
rgb[pixel_ptr++] = x & 0x03;
}
}
}
}
row_ptr += row_inc;
}
}
static void qtrle_decode_8bpp(QtrleContext *s, int row_ptr, int lines_to_change)
{
int rle_code;
int pixel_ptr;
int row_inc = s->frame->linesize[0];
uint8_t pi1, pi2, pi3, pi4; /* 4 palette indexes */
uint8_t *rgb = s->frame->data[0];
int pixel_limit = s->frame->linesize[0] * s->avctx->height;
while (lines_to_change--) {
pixel_ptr = row_ptr + (4 * (bytestream2_get_byte(&s->g) - 1));
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (4 * (bytestream2_get_byte(&s->g) - 1));
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
/* get the next 4 bytes from the stream, treat them as palette
* indexes, and output them rle_code times */
pi1 = bytestream2_get_byte(&s->g);
pi2 = bytestream2_get_byte(&s->g);
pi3 = bytestream2_get_byte(&s->g);
pi4 = bytestream2_get_byte(&s->g);
CHECK_PIXEL_PTR(rle_code * 4);
while (rle_code--) {
rgb[pixel_ptr++] = pi1;
rgb[pixel_ptr++] = pi2;
rgb[pixel_ptr++] = pi3;
rgb[pixel_ptr++] = pi4;
}
} else {
/* copy the same pixel directly to output 4 times */
rle_code *= 4;
CHECK_PIXEL_PTR(rle_code);
bytestream2_get_buffer(&s->g, &rgb[pixel_ptr], rle_code);
pixel_ptr += rle_code;
}
}
row_ptr += row_inc;
}
}
static void qtrle_decode_16bpp(QtrleContext *s, int row_ptr, int lines_to_change)
{
int rle_code;
int pixel_ptr;
int row_inc = s->frame->linesize[0];
uint16_t rgb16;
uint8_t *rgb = s->frame->data[0];
int pixel_limit = s->frame->linesize[0] * s->avctx->height;
while (lines_to_change--) {
pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 2;
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 2;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
rgb16 = bytestream2_get_be16(&s->g);
CHECK_PIXEL_PTR(rle_code * 2);
while (rle_code--) {
*(uint16_t *)(&rgb[pixel_ptr]) = rgb16;
pixel_ptr += 2;
}
} else {
CHECK_PIXEL_PTR(rle_code * 2);
/* copy pixels directly to output */
while (rle_code--) {
rgb16 = bytestream2_get_be16(&s->g);
*(uint16_t *)(&rgb[pixel_ptr]) = rgb16;
pixel_ptr += 2;
}
}
}
row_ptr += row_inc;
}
}
static void qtrle_decode_24bpp(QtrleContext *s, int row_ptr, int lines_to_change)
{
int rle_code, rle_code_half;
int pixel_ptr;
int row_inc = s->frame->linesize[0];
uint8_t b;
uint16_t rg;
uint8_t *rgb = s->frame->data[0];
int pixel_limit = s->frame->linesize[0] * s->avctx->height;
while (lines_to_change--) {
pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 3;
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 3;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
rg = bytestream2_get_ne16(&s->g);
b = bytestream2_get_byte(&s->g);
CHECK_PIXEL_PTR(rle_code * 3);
while (rle_code--) {
AV_WN16(rgb + pixel_ptr, rg);
rgb[pixel_ptr + 2] = b;
pixel_ptr += 3;
}
} else {
CHECK_PIXEL_PTR(rle_code * 3);
rle_code_half = rle_code / 2;
while (rle_code_half--) { /* copy 2 raw rgb value at the same time */
AV_WN32(rgb + pixel_ptr, bytestream2_get_ne32(&s->g)); /* rgbr */
AV_WN16(rgb + pixel_ptr + 4, bytestream2_get_ne16(&s->g)); /* rgbr */
pixel_ptr += 6;
}
if (rle_code % 2 != 0){ /* not even raw value */
AV_WN16(rgb + pixel_ptr, bytestream2_get_ne16(&s->g));
rgb[pixel_ptr + 2] = bytestream2_get_byte(&s->g);
pixel_ptr += 3;
}
}
}
row_ptr += row_inc;
}
}
static void qtrle_decode_32bpp(QtrleContext *s, int row_ptr, int lines_to_change)
{
int rle_code, rle_code_half;
int pixel_ptr;
int row_inc = s->frame->linesize[0];
unsigned int argb;
uint8_t *rgb = s->frame->data[0];
int pixel_limit = s->frame->linesize[0] * s->avctx->height;
while (lines_to_change--) {
pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 4;
CHECK_PIXEL_PTR(0);
while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {
if (bytestream2_get_bytes_left(&s->g) < 1)
return;
if (rle_code == 0) {
/* there's another skip code in the stream */
pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 4;
CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */
} else if (rle_code < 0) {
/* decode the run length code */
rle_code = -rle_code;
argb = bytestream2_get_ne32(&s->g);
CHECK_PIXEL_PTR(rle_code * 4);
while (rle_code--) {
AV_WN32A(rgb + pixel_ptr, argb);
pixel_ptr += 4;
}
} else {
CHECK_PIXEL_PTR(rle_code * 4);
/* copy pixels directly to output */
rle_code_half = rle_code / 2;
while (rle_code_half--) { /* copy 2 argb raw value at the same time */
AV_WN64(rgb + pixel_ptr, bytestream2_get_ne64(&s->g));
pixel_ptr += 8;
}
if (rle_code % 2 != 0){ /* not even raw value */
AV_WN32A(rgb + pixel_ptr, bytestream2_get_ne32(&s->g));
pixel_ptr += 4;
}
}
}
row_ptr += row_inc;
}
}
static av_cold int qtrle_decode_init(AVCodecContext *avctx)
{
QtrleContext *s = avctx->priv_data;
s->avctx = avctx;
switch (avctx->bits_per_coded_sample) {
case 1:
case 2:
case 4:
case 8:
case 33:
case 34:
case 36:
case 40:
avctx->pix_fmt = AV_PIX_FMT_PAL8;
break;
case 16:
avctx->pix_fmt = AV_PIX_FMT_RGB555;
break;
case 24:
avctx->pix_fmt = AV_PIX_FMT_RGB24;
break;
case 32:
avctx->pix_fmt = AV_PIX_FMT_ARGB;
break;
default:
av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
avctx->bits_per_coded_sample);
return AVERROR_INVALIDDATA;
}
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
return 0;
}
static int qtrle_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
QtrleContext *s = avctx->priv_data;
int header, start_line;
int height, row_ptr;
int has_palette = 0;
int duplicate = 0;
int ret, size;
bytestream2_init(&s->g, avpkt->data, avpkt->size);
/* check if this frame is even supposed to change */
if (avpkt->size < 8) {
duplicate = 1;
goto done;
}
/* start after the chunk size */
size = bytestream2_get_be32(&s->g) & 0x3FFFFFFF;
if (size - avpkt->size > size * (int64_t)avctx->discard_damaged_percentage / 100)
return AVERROR_INVALIDDATA;
/* fetch the header */
header = bytestream2_get_be16(&s->g);
/* if a header is present, fetch additional decoding parameters */
if (header & 0x0008) {
if (avpkt->size < 14) {
duplicate = 1;
goto done;
}
start_line = bytestream2_get_be16(&s->g);
bytestream2_skip(&s->g, 2);
height = bytestream2_get_be16(&s->g);
bytestream2_skip(&s->g, 2);
if (height > s->avctx->height - start_line) {
duplicate = 1;
goto done;
}
} else {
start_line = 0;
height = s->avctx->height;
}
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
return ret;
row_ptr = s->frame->linesize[0] * start_line;
switch (avctx->bits_per_coded_sample) {
case 1:
case 33:
qtrle_decode_1bpp(s, row_ptr, height);
has_palette = 1;
break;
case 2:
case 34:
qtrle_decode_2n4bpp(s, row_ptr, height, 2);
has_palette = 1;
break;
case 4:
case 36:
qtrle_decode_2n4bpp(s, row_ptr, height, 4);
has_palette = 1;
break;
case 8:
case 40:
qtrle_decode_8bpp(s, row_ptr, height);
has_palette = 1;
break;
case 16:
qtrle_decode_16bpp(s, row_ptr, height);
break;
case 24:
qtrle_decode_24bpp(s, row_ptr, height);
break;
case 32:
qtrle_decode_32bpp(s, row_ptr, height);
break;
default:
av_log (s->avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",
avctx->bits_per_coded_sample);
break;
}
if(has_palette) {
s->frame->palette_has_changed = ff_copy_palette(s->pal, avpkt, avctx);
/* make the palette available on the way out */
memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
}
done:
if (!s->frame->data[0])
return AVERROR_INVALIDDATA;
if (duplicate) {
// ff_reget_buffer() isn't needed when frames don't change, so just update
// frame props.
ret = ff_decode_frame_props(avctx, s->frame);
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 void qtrle_decode_flush(AVCodecContext *avctx)
{
QtrleContext *s = avctx->priv_data;
av_frame_unref(s->frame);
}
static av_cold int qtrle_decode_end(AVCodecContext *avctx)
{
QtrleContext *s = avctx->priv_data;
av_frame_free(&s->frame);
return 0;
}
const FFCodec ff_qtrle_decoder = {
.p.name = "qtrle",
.p.long_name = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_QTRLE,
.priv_data_size = sizeof(QtrleContext),
.init = qtrle_decode_init,
.close = qtrle_decode_end,
.decode = qtrle_decode_frame,
.flush = qtrle_decode_flush,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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