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ffmpeg/libavcodec/flicvideo.c
Stefano Sabatini efd6cbc5dd flicvideo: fix crash on flic files with invalid frame size 
Add a check in flic_decode_frame_8BPP(), in case chunk_size is >
frame_size issue a warning and resize chunk_size to frame_size, in
order to avoid out-of-buffer reads.

Fix roundup issue #2520, trac issue #69.

Signed-off-by: Stefano Sabatini <stefano.sabatini-lala@poste.it>
2011-04-23 12:13:20 +02:00

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/*
* FLI/FLC Animation Video Decoder
* Copyright (C) 2003, 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
* Autodesk Animator FLI/FLC Video Decoder
* by Mike Melanson (melanson@pcisys.net)
* for more information on the .fli/.flc file format and all of its many
* variations, visit:
* http://www.compuphase.com/flic.htm
*
* This decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24
* colorspace data, depending on the FLC. To use this decoder, be
* sure that your demuxer sends the FLI file header to the decoder via
* the extradata chunk in AVCodecContext. The chunk should be 128 bytes
* large. The only exception is for FLI files from the game "Magic Carpet",
* in which the header is only 12 bytes.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#define FLI_256_COLOR 4
#define FLI_DELTA 7
#define FLI_COLOR 11
#define FLI_LC 12
#define FLI_BLACK 13
#define FLI_BRUN 15
#define FLI_COPY 16
#define FLI_MINI 18
#define FLI_DTA_BRUN 25
#define FLI_DTA_COPY 26
#define FLI_DTA_LC 27
#define FLI_TYPE_CODE (0xAF11)
#define FLC_FLX_TYPE_CODE (0xAF12)
#define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
#define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
#define CHECK_PIXEL_PTR(n) \
if (pixel_ptr + n > pixel_limit) { \
av_log (s->avctx, AV_LOG_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %d\n", \
pixel_ptr + n, pixel_limit); \
return AVERROR_INVALIDDATA; \
} \
typedef struct FlicDecodeContext {
AVCodecContext *avctx;
AVFrame frame;
unsigned int palette[256];
int new_palette;
int fli_type; /* either 0xAF11 or 0xAF12, affects palette resolution */
} FlicDecodeContext;
static av_cold int flic_decode_init(AVCodecContext *avctx)
{
FlicDecodeContext *s = avctx->priv_data;
unsigned char *fli_header = (unsigned char *)avctx->extradata;
int depth;
s->avctx = avctx;
s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
depth = 0;
if (s->avctx->extradata_size == 12) {
/* special case for magic carpet FLIs */
s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
depth = 8;
} else if (s->avctx->extradata_size != 128) {
av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
return -1;
} else {
depth = AV_RL16(&fli_header[12]);
}
if (depth == 0) {
depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
}
if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
}
switch (depth) {
case 8 : avctx->pix_fmt = PIX_FMT_PAL8; break;
case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
return -1;
break;
default :
av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
return -1;
}
s->frame.data[0] = NULL;
s->new_palette = 0;
return 0;
}
static int flic_decode_frame_8BPP(AVCodecContext *avctx,
void *data, int *data_size,
const uint8_t *buf, int buf_size)
{
FlicDecodeContext *s = avctx->priv_data;
int stream_ptr = 0;
int stream_ptr_after_color_chunk;
int pixel_ptr;
int palette_ptr;
unsigned char palette_idx1;
unsigned char palette_idx2;
unsigned int frame_size;
int num_chunks;
unsigned int chunk_size;
int chunk_type;
int i, j;
int color_packets;
int color_changes;
int color_shift;
unsigned char r, g, b;
int lines;
int compressed_lines;
int starting_line;
signed short line_packets;
int y_ptr;
int byte_run;
int pixel_skip;
int pixel_countdown;
unsigned char *pixels;
unsigned int pixel_limit;
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) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
}
pixels = s->frame.data[0];
pixel_limit = s->avctx->height * s->frame.linesize[0];
frame_size = AV_RL32(&buf[stream_ptr]);
stream_ptr += 6; /* skip the magic number */
num_chunks = AV_RL16(&buf[stream_ptr]);
stream_ptr += 10; /* skip padding */
frame_size -= 16;
/* iterate through the chunks */
while ((frame_size > 0) && (num_chunks > 0)) {
chunk_size = AV_RL32(&buf[stream_ptr]);
if (chunk_size > frame_size) {
av_log(avctx, AV_LOG_WARNING,
"Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
chunk_size = frame_size;
}
stream_ptr += 4;
chunk_type = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
switch (chunk_type) {
case FLI_256_COLOR:
case FLI_COLOR:
stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
/* check special case: If this file is from the Magic Carpet
* game and uses 6-bit colors even though it reports 256-color
* chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
* initialization) */
if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
color_shift = 0;
else
color_shift = 2;
/* set up the palette */
color_packets = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
palette_ptr = 0;
for (i = 0; i < color_packets; i++) {
/* first byte is how many colors to skip */
palette_ptr += buf[stream_ptr++];
/* next byte indicates how many entries to change */
color_changes = buf[stream_ptr++];
/* if there are 0 color changes, there are actually 256 */
if (color_changes == 0)
color_changes = 256;
for (j = 0; j < color_changes; j++) {
unsigned int entry;
/* wrap around, for good measure */
if ((unsigned)palette_ptr >= 256)
palette_ptr = 0;
r = buf[stream_ptr++] << color_shift;
g = buf[stream_ptr++] << color_shift;
b = buf[stream_ptr++] << color_shift;
entry = (r << 16) | (g << 8) | b;
if (s->palette[palette_ptr] != entry)
s->new_palette = 1;
s->palette[palette_ptr++] = entry;
}
}
/* color chunks sometimes have weird 16-bit alignment issues;
* therefore, take the hardline approach and set the stream_ptr
* to the value calculated w.r.t. the size specified by the color
* chunk header */
stream_ptr = stream_ptr_after_color_chunk;
break;
case FLI_DELTA:
y_ptr = 0;
compressed_lines = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
while (compressed_lines > 0) {
line_packets = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
if ((line_packets & 0xC000) == 0xC000) {
// line skip opcode
line_packets = -line_packets;
y_ptr += line_packets * s->frame.linesize[0];
} else if ((line_packets & 0xC000) == 0x4000) {
av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
} else if ((line_packets & 0xC000) == 0x8000) {
// "last byte" opcode
pixel_ptr= y_ptr + s->frame.linesize[0] - 1;
CHECK_PIXEL_PTR(0);
pixels[pixel_ptr] = line_packets & 0xff;
} else {
compressed_lines--;
pixel_ptr = y_ptr;
CHECK_PIXEL_PTR(0);
pixel_countdown = s->avctx->width;
for (i = 0; i < line_packets; i++) {
/* account for the skip bytes */
pixel_skip = buf[stream_ptr++];
pixel_ptr += pixel_skip;
pixel_countdown -= pixel_skip;
byte_run = (signed char)(buf[stream_ptr++]);
if (byte_run < 0) {
byte_run = -byte_run;
palette_idx1 = buf[stream_ptr++];
palette_idx2 = buf[stream_ptr++];
CHECK_PIXEL_PTR(byte_run * 2);
for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
pixels[pixel_ptr++] = palette_idx1;
pixels[pixel_ptr++] = palette_idx2;
}
} else {
CHECK_PIXEL_PTR(byte_run * 2);
for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
palette_idx1 = buf[stream_ptr++];
pixels[pixel_ptr++] = palette_idx1;
}
}
}
y_ptr += s->frame.linesize[0];
}
}
break;
case FLI_LC:
/* line compressed */
starting_line = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
y_ptr = 0;
y_ptr += starting_line * s->frame.linesize[0];
compressed_lines = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
while (compressed_lines > 0) {
pixel_ptr = y_ptr;
CHECK_PIXEL_PTR(0);
pixel_countdown = s->avctx->width;
line_packets = buf[stream_ptr++];
if (line_packets > 0) {
for (i = 0; i < line_packets; i++) {
/* account for the skip bytes */
pixel_skip = buf[stream_ptr++];
pixel_ptr += pixel_skip;
pixel_countdown -= pixel_skip;
byte_run = (signed char)(buf[stream_ptr++]);
if (byte_run > 0) {
CHECK_PIXEL_PTR(byte_run);
for (j = 0; j < byte_run; j++, pixel_countdown--) {
palette_idx1 = buf[stream_ptr++];
pixels[pixel_ptr++] = palette_idx1;
}
} else if (byte_run < 0) {
byte_run = -byte_run;
palette_idx1 = buf[stream_ptr++];
CHECK_PIXEL_PTR(byte_run);
for (j = 0; j < byte_run; j++, pixel_countdown--) {
pixels[pixel_ptr++] = palette_idx1;
}
}
}
}
y_ptr += s->frame.linesize[0];
compressed_lines--;
}
break;
case FLI_BLACK:
/* set the whole frame to color 0 (which is usually black) */
memset(pixels, 0,
s->frame.linesize[0] * s->avctx->height);
break;
case FLI_BRUN:
/* Byte run compression: This chunk type only occurs in the first
* FLI frame and it will update the entire frame. */
y_ptr = 0;
for (lines = 0; lines < s->avctx->height; lines++) {
pixel_ptr = y_ptr;
/* disregard the line packets; instead, iterate through all
* pixels on a row */
stream_ptr++;
pixel_countdown = s->avctx->width;
while (pixel_countdown > 0) {
byte_run = (signed char)(buf[stream_ptr++]);
if (byte_run > 0) {
palette_idx1 = buf[stream_ptr++];
CHECK_PIXEL_PTR(byte_run);
for (j = 0; j < byte_run; j++) {
pixels[pixel_ptr++] = palette_idx1;
pixel_countdown--;
if (pixel_countdown < 0)
av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
pixel_countdown, lines);
}
} else { /* copy bytes if byte_run < 0 */
byte_run = -byte_run;
CHECK_PIXEL_PTR(byte_run);
for (j = 0; j < byte_run; j++) {
palette_idx1 = buf[stream_ptr++];
pixels[pixel_ptr++] = palette_idx1;
pixel_countdown--;
if (pixel_countdown < 0)
av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
pixel_countdown, lines);
}
}
}
y_ptr += s->frame.linesize[0];
}
break;
case FLI_COPY:
/* copy the chunk (uncompressed frame) */
if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
"bigger than image, skipping chunk\n", chunk_size - 6);
stream_ptr += chunk_size - 6;
} else {
for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
y_ptr += s->frame.linesize[0]) {
memcpy(&pixels[y_ptr], &buf[stream_ptr],
s->avctx->width);
stream_ptr += s->avctx->width;
}
}
break;
case FLI_MINI:
/* some sort of a thumbnail? disregard this chunk... */
stream_ptr += chunk_size - 6;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
break;
}
frame_size -= chunk_size;
num_chunks--;
}
/* by the end of the chunk, the stream ptr should equal the frame
* size (minus 1, possibly); if it doesn't, issue a warning */
if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
"and final chunk ptr = %d\n", buf_size, stream_ptr);
/* make the palette available on the way out */
memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
if (s->new_palette) {
s->frame.palette_has_changed = 1;
s->new_palette = 0;
}
*data_size=sizeof(AVFrame);
*(AVFrame*)data = s->frame;
return buf_size;
}
static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
void *data, int *data_size,
const uint8_t *buf, int buf_size)
{
/* Note, the only difference between the 15Bpp and 16Bpp */
/* Format is the pixel format, the packets are processed the same. */
FlicDecodeContext *s = avctx->priv_data;
int stream_ptr = 0;
int pixel_ptr;
unsigned char palette_idx1;
unsigned int frame_size;
int num_chunks;
unsigned int chunk_size;
int chunk_type;
int i, j;
int lines;
int compressed_lines;
signed short line_packets;
int y_ptr;
int byte_run;
int pixel_skip;
int pixel_countdown;
unsigned char *pixels;
int pixel;
unsigned int pixel_limit;
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) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
}
pixels = s->frame.data[0];
pixel_limit = s->avctx->height * s->frame.linesize[0];
frame_size = AV_RL32(&buf[stream_ptr]);
stream_ptr += 6; /* skip the magic number */
num_chunks = AV_RL16(&buf[stream_ptr]);
stream_ptr += 10; /* skip padding */
frame_size -= 16;
/* iterate through the chunks */
while ((frame_size > 0) && (num_chunks > 0)) {
chunk_size = AV_RL32(&buf[stream_ptr]);
stream_ptr += 4;
chunk_type = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
switch (chunk_type) {
case FLI_256_COLOR:
case FLI_COLOR:
/* For some reason, it seems that non-palettized flics do
* include one of these chunks in their first frame.
* Why I do not know, it seems rather extraneous. */
/* av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
stream_ptr = stream_ptr + chunk_size - 6;
break;
case FLI_DELTA:
case FLI_DTA_LC:
y_ptr = 0;
compressed_lines = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
while (compressed_lines > 0) {
line_packets = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
if (line_packets < 0) {
line_packets = -line_packets;
y_ptr += line_packets * s->frame.linesize[0];
} else {
compressed_lines--;
pixel_ptr = y_ptr;
CHECK_PIXEL_PTR(0);
pixel_countdown = s->avctx->width;
for (i = 0; i < line_packets; i++) {
/* account for the skip bytes */
pixel_skip = buf[stream_ptr++];
pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
pixel_countdown -= pixel_skip;
byte_run = (signed char)(buf[stream_ptr++]);
if (byte_run < 0) {
byte_run = -byte_run;
pixel = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
CHECK_PIXEL_PTR(2 * byte_run);
for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
*((signed short*)(&pixels[pixel_ptr])) = pixel;
pixel_ptr += 2;
}
} else {
CHECK_PIXEL_PTR(2 * byte_run);
for (j = 0; j < byte_run; j++, pixel_countdown--) {
*((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
pixel_ptr += 2;
}
}
}
y_ptr += s->frame.linesize[0];
}
}
break;
case FLI_LC:
av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
stream_ptr = stream_ptr + chunk_size - 6;
break;
case FLI_BLACK:
/* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
memset(pixels, 0x0000,
s->frame.linesize[0] * s->avctx->height);
break;
case FLI_BRUN:
y_ptr = 0;
for (lines = 0; lines < s->avctx->height; lines++) {
pixel_ptr = y_ptr;
/* disregard the line packets; instead, iterate through all
* pixels on a row */
stream_ptr++;
pixel_countdown = (s->avctx->width * 2);
while (pixel_countdown > 0) {
byte_run = (signed char)(buf[stream_ptr++]);
if (byte_run > 0) {
palette_idx1 = buf[stream_ptr++];
CHECK_PIXEL_PTR(byte_run);
for (j = 0; j < byte_run; j++) {
pixels[pixel_ptr++] = palette_idx1;
pixel_countdown--;
if (pixel_countdown < 0)
av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
pixel_countdown, lines);
}
} else { /* copy bytes if byte_run < 0 */
byte_run = -byte_run;
CHECK_PIXEL_PTR(byte_run);
for (j = 0; j < byte_run; j++) {
palette_idx1 = buf[stream_ptr++];
pixels[pixel_ptr++] = palette_idx1;
pixel_countdown--;
if (pixel_countdown < 0)
av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
pixel_countdown, lines);
}
}
}
/* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
* This does not give us any good oportunity to perform word endian conversion
* during decompression. So if it is required (i.e., this is not a LE target, we do
* a second pass over the line here, swapping the bytes.
*/
#if HAVE_BIGENDIAN
pixel_ptr = y_ptr;
pixel_countdown = s->avctx->width;
while (pixel_countdown > 0) {
*((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
pixel_ptr += 2;
}
#endif
y_ptr += s->frame.linesize[0];
}
break;
case FLI_DTA_BRUN:
y_ptr = 0;
for (lines = 0; lines < s->avctx->height; lines++) {
pixel_ptr = y_ptr;
/* disregard the line packets; instead, iterate through all
* pixels on a row */
stream_ptr++;
pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
while (pixel_countdown > 0) {
byte_run = (signed char)(buf[stream_ptr++]);
if (byte_run > 0) {
pixel = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
CHECK_PIXEL_PTR(2 * byte_run);
for (j = 0; j < byte_run; j++) {
*((signed short*)(&pixels[pixel_ptr])) = pixel;
pixel_ptr += 2;
pixel_countdown--;
if (pixel_countdown < 0)
av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
pixel_countdown);
}
} else { /* copy pixels if byte_run < 0 */
byte_run = -byte_run;
CHECK_PIXEL_PTR(2 * byte_run);
for (j = 0; j < byte_run; j++) {
*((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
stream_ptr += 2;
pixel_ptr += 2;
pixel_countdown--;
if (pixel_countdown < 0)
av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
pixel_countdown);
}
}
}
y_ptr += s->frame.linesize[0];
}
break;
case FLI_COPY:
case FLI_DTA_COPY:
/* copy the chunk (uncompressed frame) */
if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
"bigger than image, skipping chunk\n", chunk_size - 6);
stream_ptr += chunk_size - 6;
} else {
for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
y_ptr += s->frame.linesize[0]) {
pixel_countdown = s->avctx->width;
pixel_ptr = 0;
while (pixel_countdown > 0) {
*((signed short*)(&pixels[y_ptr + pixel_ptr])) = AV_RL16(&buf[stream_ptr+pixel_ptr]);
pixel_ptr += 2;
pixel_countdown--;
}
stream_ptr += s->avctx->width*2;
}
}
break;
case FLI_MINI:
/* some sort of a thumbnail? disregard this chunk... */
stream_ptr += chunk_size - 6;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
break;
}
frame_size -= chunk_size;
num_chunks--;
}
/* by the end of the chunk, the stream ptr should equal the frame
* size (minus 1, possibly); if it doesn't, issue a warning */
if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
"and final chunk ptr = %d\n", buf_size, stream_ptr);
*data_size=sizeof(AVFrame);
*(AVFrame*)data = s->frame;
return buf_size;
}
static int flic_decode_frame_24BPP(AVCodecContext *avctx,
void *data, int *data_size,
const uint8_t *buf, int buf_size)
{
av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
return -1;
}
static int flic_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
if (avctx->pix_fmt == PIX_FMT_PAL8) {
return flic_decode_frame_8BPP(avctx, data, data_size,
buf, buf_size);
}
else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
(avctx->pix_fmt == PIX_FMT_RGB565)) {
return flic_decode_frame_15_16BPP(avctx, data, data_size,
buf, buf_size);
}
else if (avctx->pix_fmt == PIX_FMT_BGR24) {
return flic_decode_frame_24BPP(avctx, data, data_size,
buf, buf_size);
}
/* Should not get here, ever as the pix_fmt is processed */
/* in flic_decode_init and the above if should deal with */
/* the finite set of possibilites allowable by here. */
/* But in case we do, just error out. */
av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
return -1;
}
static av_cold int flic_decode_end(AVCodecContext *avctx)
{
FlicDecodeContext *s = avctx->priv_data;
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
return 0;
}
AVCodec ff_flic_decoder = {
"flic",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_FLIC,
sizeof(FlicDecodeContext),
flic_decode_init,
NULL,
flic_decode_end,
flic_decode_frame,
CODEC_CAP_DR1,
NULL,
NULL,
NULL,
NULL,
.long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
};
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