summaryrefslogtreecommitdiff
path: root/ffmpeg/libavcodec/flicvideo.c
diff options
context:
space:
mode:
Diffstat (limited to 'ffmpeg/libavcodec/flicvideo.c')
-rw-r--r--ffmpeg/libavcodec/flicvideo.c813
1 files changed, 813 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/flicvideo.c b/ffmpeg/libavcodec/flicvideo.c
new file mode 100644
index 0000000..90885fc
--- /dev/null
+++ b/ffmpeg/libavcodec/flicvideo.c
@@ -0,0 +1,813 @@
+/*
+ * 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"
+#include "bytestream.h"
+#include "internal.h"
+#include "mathops.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;
+
+ if (avctx->extradata_size != 0 &&
+ avctx->extradata_size != 12 &&
+ avctx->extradata_size != 128 &&
+ avctx->extradata_size != 256 &&
+ avctx->extradata_size != 904 &&
+ avctx->extradata_size != 1024) {
+ av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ s->avctx = avctx;
+
+ 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 (avctx->extradata_size == 1024) {
+ uint8_t *ptr = avctx->extradata;
+ int i;
+
+ for (i = 0; i < 256; i++) {
+ s->palette[i] = AV_RL32(ptr);
+ ptr += 4;
+ }
+ depth = 8;
+ /* FLI in MOV, see e.g. FFmpeg trac issue #626 */
+ } else if (avctx->extradata_size == 0 ||
+ avctx->extradata_size == 256 ||
+ /* see FFmpeg ticket #1234 */
+ avctx->extradata_size == 904) {
+ s->fli_type = FLI_TYPE_CODE;
+ depth = 8;
+ } else {
+ s->fli_type = AV_RL16(&fli_header[4]);
+ 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 = AV_PIX_FMT_PAL8; break;
+ case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
+ case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break;
+ case 24 : avctx->pix_fmt = AV_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 AVERROR_PATCHWELCOME;
+ default :
+ av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
+ return AVERROR_INVALIDDATA;
+ }
+
+ avcodec_get_frame_defaults(&s->frame);
+ s->new_palette = 0;
+
+ return 0;
+}
+
+static int flic_decode_frame_8BPP(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ const uint8_t *buf, int buf_size)
+{
+ FlicDecodeContext *s = avctx->priv_data;
+
+ GetByteContext g2;
+ 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, ret;
+
+ 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;
+
+ bytestream2_init(&g2, buf, buf_size);
+
+ if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
+ return ret;
+
+ pixels = s->frame.data[0];
+ pixel_limit = s->avctx->height * s->frame.linesize[0];
+ if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + FF_INPUT_BUFFER_PADDING_SIZE))
+ return AVERROR_INVALIDDATA;
+ frame_size = bytestream2_get_le32(&g2);
+ if (frame_size > buf_size)
+ frame_size = buf_size;
+ bytestream2_skip(&g2, 2); /* skip the magic number */
+ num_chunks = bytestream2_get_le16(&g2);
+ bytestream2_skip(&g2, 8); /* skip padding */
+
+ frame_size -= 16;
+
+ /* iterate through the chunks */
+ while ((frame_size >= 6) && (num_chunks > 0)) {
+ int stream_ptr_after_chunk;
+ chunk_size = bytestream2_get_le32(&g2);
+ 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_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
+
+ chunk_type = bytestream2_get_le16(&g2);
+
+ switch (chunk_type) {
+ case FLI_256_COLOR:
+ case FLI_COLOR:
+ /* 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 = bytestream2_get_le16(&g2);
+ palette_ptr = 0;
+ for (i = 0; i < color_packets; i++) {
+ /* first byte is how many colors to skip */
+ palette_ptr += bytestream2_get_byte(&g2);
+
+ /* next byte indicates how many entries to change */
+ color_changes = bytestream2_get_byte(&g2);
+
+ /* if there are 0 color changes, there are actually 256 */
+ if (color_changes == 0)
+ color_changes = 256;
+
+ if (bytestream2_tell(&g2) + color_changes * 3 > stream_ptr_after_chunk)
+ break;
+
+ for (j = 0; j < color_changes; j++) {
+ unsigned int entry;
+
+ /* wrap around, for good measure */
+ if ((unsigned)palette_ptr >= 256)
+ palette_ptr = 0;
+
+ r = bytestream2_get_byte(&g2) << color_shift;
+ g = bytestream2_get_byte(&g2) << color_shift;
+ b = bytestream2_get_byte(&g2) << color_shift;
+ entry = 0xFFU << 24 | r << 16 | g << 8 | b;
+ if (color_shift == 2)
+ entry |= entry >> 6 & 0x30303;
+ if (s->palette[palette_ptr] != entry)
+ s->new_palette = 1;
+ s->palette[palette_ptr++] = entry;
+ }
+ }
+ break;
+
+ case FLI_DELTA:
+ y_ptr = 0;
+ compressed_lines = bytestream2_get_le16(&g2);
+ while (compressed_lines > 0) {
+ if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
+ break;
+ line_packets = bytestream2_get_le16(&g2);
+ 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++) {
+ if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
+ break;
+ /* account for the skip bytes */
+ pixel_skip = bytestream2_get_byte(&g2);
+ pixel_ptr += pixel_skip;
+ pixel_countdown -= pixel_skip;
+ byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
+ if (byte_run < 0) {
+ byte_run = -byte_run;
+ palette_idx1 = bytestream2_get_byte(&g2);
+ palette_idx2 = bytestream2_get_byte(&g2);
+ 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);
+ if (bytestream2_tell(&g2) + byte_run * 2 > stream_ptr_after_chunk)
+ break;
+ for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
+ pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
+ }
+ }
+ }
+
+ y_ptr += s->frame.linesize[0];
+ }
+ }
+ break;
+
+ case FLI_LC:
+ /* line compressed */
+ starting_line = bytestream2_get_le16(&g2);
+ y_ptr = 0;
+ y_ptr += starting_line * s->frame.linesize[0];
+
+ compressed_lines = bytestream2_get_le16(&g2);
+ while (compressed_lines > 0) {
+ pixel_ptr = y_ptr;
+ CHECK_PIXEL_PTR(0);
+ pixel_countdown = s->avctx->width;
+ if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
+ break;
+ line_packets = bytestream2_get_byte(&g2);
+ if (line_packets > 0) {
+ for (i = 0; i < line_packets; i++) {
+ /* account for the skip bytes */
+ if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
+ break;
+ pixel_skip = bytestream2_get_byte(&g2);
+ pixel_ptr += pixel_skip;
+ pixel_countdown -= pixel_skip;
+ byte_run = sign_extend(bytestream2_get_byte(&g2),8);
+ if (byte_run > 0) {
+ CHECK_PIXEL_PTR(byte_run);
+ if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
+ break;
+ for (j = 0; j < byte_run; j++, pixel_countdown--) {
+ pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
+ }
+ } else if (byte_run < 0) {
+ byte_run = -byte_run;
+ palette_idx1 = bytestream2_get_byte(&g2);
+ 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 */
+ bytestream2_skip(&g2, 1);
+ pixel_countdown = s->avctx->width;
+ while (pixel_countdown > 0) {
+ if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
+ break;
+ byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
+ if (!byte_run) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid byte run value.\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (byte_run > 0) {
+ palette_idx1 = bytestream2_get_byte(&g2);
+ 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);
+ if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
+ break;
+ for (j = 0; j < byte_run; j++) {
+ pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
+ 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) " \
+ "has incorrect size, skipping chunk\n", chunk_size - 6);
+ bytestream2_skip(&g2, chunk_size - 6);
+ } else {
+ for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
+ y_ptr += s->frame.linesize[0]) {
+ bytestream2_get_buffer(&g2, &pixels[y_ptr],
+ s->avctx->width);
+ }
+ }
+ break;
+
+ case FLI_MINI:
+ /* some sort of a thumbnail? disregard this chunk... */
+ break;
+
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
+ break;
+ }
+
+ if (stream_ptr_after_chunk - bytestream2_tell(&g2) > 0)
+ bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
+
+ frame_size -= chunk_size;
+ num_chunks--;
+ }
+
+ /* by the end of the chunk, the stream ptr should equal the frame
+ * size (minus 1 or 2, possibly); if it doesn't, issue a warning */
+ if (bytestream2_get_bytes_left(&g2) > 2)
+ av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
+ "and final chunk ptr = %d\n", buf_size,
+ buf_size - bytestream2_get_bytes_left(&g2));
+
+ /* 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;
+ }
+
+ if ((ret = av_frame_ref(data, &s->frame)) < 0)
+ return ret;
+
+ *got_frame = 1;
+
+ return buf_size;
+}
+
+static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ 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;
+
+ GetByteContext g2;
+ int pixel_ptr;
+ unsigned char palette_idx1;
+
+ unsigned int frame_size;
+ int num_chunks;
+
+ unsigned int chunk_size;
+ int chunk_type;
+
+ int i, j, ret;
+
+ 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;
+
+ bytestream2_init(&g2, buf, buf_size);
+
+ if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
+ return ret;
+
+ pixels = s->frame.data[0];
+ pixel_limit = s->avctx->height * s->frame.linesize[0];
+
+ frame_size = bytestream2_get_le32(&g2);
+ bytestream2_skip(&g2, 2); /* skip the magic number */
+ num_chunks = bytestream2_get_le16(&g2);
+ bytestream2_skip(&g2, 8); /* skip padding */
+ if (frame_size > buf_size)
+ frame_size = buf_size;
+
+ frame_size -= 16;
+
+ /* iterate through the chunks */
+ while ((frame_size > 0) && (num_chunks > 0)) {
+ int stream_ptr_after_chunk;
+ chunk_size = bytestream2_get_le32(&g2);
+ 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_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
+
+ chunk_type = bytestream2_get_le16(&g2);
+
+
+ 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_dlog(avctx,
+ "Unexpected Palette chunk %d in non-palettized FLC\n",
+ chunk_type);
+ bytestream2_skip(&g2, chunk_size - 6);
+ break;
+
+ case FLI_DELTA:
+ case FLI_DTA_LC:
+ y_ptr = 0;
+ compressed_lines = bytestream2_get_le16(&g2);
+ while (compressed_lines > 0) {
+ if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
+ break;
+ line_packets = bytestream2_get_le16(&g2);
+ 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 */
+ if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
+ break;
+ pixel_skip = bytestream2_get_byte(&g2);
+ pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
+ pixel_countdown -= pixel_skip;
+ byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
+ if (byte_run < 0) {
+ byte_run = -byte_run;
+ pixel = bytestream2_get_le16(&g2);
+ 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 {
+ if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
+ break;
+ CHECK_PIXEL_PTR(2 * byte_run);
+ for (j = 0; j < byte_run; j++, pixel_countdown--) {
+ *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
+ 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");
+ bytestream2_skip(&g2, 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 */
+ bytestream2_skip(&g2, 1);
+ pixel_countdown = (s->avctx->width * 2);
+
+ while (pixel_countdown > 0) {
+ if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
+ break;
+ byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
+ if (byte_run > 0) {
+ palette_idx1 = bytestream2_get_byte(&g2);
+ 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;
+ if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
+ break;
+ CHECK_PIXEL_PTR(byte_run);
+ for (j = 0; j < byte_run; j++) {
+ palette_idx1 = bytestream2_get_byte(&g2);
+ 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 opportunity 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 */
+ bytestream2_skip(&g2, 1);
+ pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
+
+ while (pixel_countdown > 0) {
+ if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
+ break;
+ byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
+ if (byte_run > 0) {
+ pixel = bytestream2_get_le16(&g2);
+ 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;
+ if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk)
+ break;
+ CHECK_PIXEL_PTR(2 * byte_run);
+ for (j = 0; j < byte_run; j++) {
+ *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
+ 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);
+ bytestream2_skip(&g2, 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])) = bytestream2_get_le16(&g2);
+ pixel_ptr += 2;
+ pixel_countdown--;
+ }
+ }
+ }
+ break;
+
+ case FLI_MINI:
+ /* some sort of a thumbnail? disregard this chunk... */
+ bytestream2_skip(&g2, 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 ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
+ av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
+ "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
+
+ if ((ret = av_frame_ref(data, &s->frame)) < 0)
+ return ret;
+
+ *got_frame = 1;
+
+ return buf_size;
+}
+
+static int flic_decode_frame_24BPP(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ const uint8_t *buf, int buf_size)
+{
+ av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
+ return AVERROR_PATCHWELCOME;
+}
+
+static int flic_decode_frame(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
+ return flic_decode_frame_8BPP(avctx, data, got_frame,
+ buf, buf_size);
+ }
+ else if ((avctx->pix_fmt == AV_PIX_FMT_RGB555) ||
+ (avctx->pix_fmt == AV_PIX_FMT_RGB565)) {
+ return flic_decode_frame_15_16BPP(avctx, data, got_frame,
+ buf, buf_size);
+ }
+ else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
+ return flic_decode_frame_24BPP(avctx, data, got_frame,
+ 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 AVERROR_BUG;
+}
+
+
+static av_cold int flic_decode_end(AVCodecContext *avctx)
+{
+ FlicDecodeContext *s = avctx->priv_data;
+
+ av_frame_unref(&s->frame);
+
+ return 0;
+}
+
+AVCodec ff_flic_decoder = {
+ .name = "flic",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_FLIC,
+ .priv_data_size = sizeof(FlicDecodeContext),
+ .init = flic_decode_init,
+ .close = flic_decode_end,
+ .decode = flic_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
+};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 14:22:30 +0000