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support for FLX and DTA extensions in the FLIC format, courtesy of

Browse Source 
Steven Johnson (mplayer -at- sakuraindustries.com)

Originally committed as revision 4639 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Mike Melanson 20 years ago
parent 64af6168f7
commit 515ae4760a
2 changed files with 354 additions and 14 deletions
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  1. 356
      libavcodec/flicvideo.c
  2. 10
      libavformat/flic.c

356
libavcodec/flicvideo.c
Unescape View File

@ -26,7 +26,8 @@
* variations, visit:
* http://www.compuphase.com/flic.htm
*
* This decoder outputs PAL8 colorspace data. To use this decoder, be
* 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",
@ -50,6 +51,14 @@
#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) { \
@ -71,30 +80,52 @@ static int flic_decode_init(AVCodecContext *avctx)
{
FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
unsigned char *fli_header = (unsigned char *)avctx->extradata;
int depth;
s->avctx = avctx;
avctx->pix_fmt = PIX_FMT_PAL8;
avctx->has_b_frames = 0;
s->fli_type = LE_16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
depth = LE_16(&fli_header[12]);
if (depth == 0) {
depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
}
if (s->avctx->extradata_size == 12) {
/* special case for magic carpet FLIs */
s->fli_type = 0xAF13;
} else if (s->avctx->extradata_size == 128) {
s->fli_type = LE_16(&fli_header[4]);
} else {
s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
} else if (s->avctx->extradata_size != 128) {
av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
return -1;
}
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, "Unkown 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(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
static int flic_decode_frame_8BPP(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
@ -163,7 +194,7 @@ static int flic_decode_frame(AVCodecContext *avctx,
* 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 != 0xAF13))
if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
color_shift = 0;
else
color_shift = 2;
@ -384,6 +415,308 @@ static int flic_decode_frame(AVCodecContext *avctx,
return buf_size;
}
int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
void *data, int *data_size,
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 = (FlicDecodeContext *)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;
signed char byte_run;
int pixel_skip;
int pixel_countdown;
unsigned char *pixels;
int pixel;
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 = LE_32(&buf[stream_ptr]);
stream_ptr += 6; /* skip the magic number */
num_chunks = LE_16(&buf[stream_ptr]);
stream_ptr += 10; /* skip padding */
frame_size -= 16;
/* iterate through the chunks */
while ((frame_size > 0) && (num_chunks > 0)) {
chunk_size = LE_32(&buf[stream_ptr]);
stream_ptr += 4;
chunk_type = LE_16(&buf[stream_ptr]);
stream_ptr += 2;
switch (chunk_type) {
case FLI_256_COLOR:
case FLI_COLOR:
/* For some reason, it seems that non-paletised 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 = LE_16(&buf[stream_ptr]);
stream_ptr += 2;
while (compressed_lines > 0) {
line_packets = LE_16(&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;
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 = buf[stream_ptr++];
if (byte_run < 0) {
byte_run = -byte_run;
pixel = LE_16(&buf[stream_ptr]);
stream_ptr += 2;
CHECK_PIXEL_PTR(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(byte_run);
for (j = 0; j < byte_run; j++, pixel_countdown--) {
*((signed short*)(&pixels[pixel_ptr])) = LE_16(&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 balck in both 15Bpp and 16Bpp modes. */
memset(pixels, 0x0000,
s->frame.linesize[0] * s->avctx->height * 2);
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 = 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)\n",
pixel_countdown);
}
} 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)\n",
pixel_countdown);
}
}
}
/* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
* This doesnt give us any good oportunity to perform word endian conversion
* during decompression. So if its requried (ie, this isnt a LE target, we do
* a second pass over the line here, swapping the bytes.
*/
pixel = 0xFF00;
if (0xFF00 != LE_16(&pixel)) /* Check if its not an LE Target */
{
pixel_ptr = y_ptr;
pixel_countdown = s->avctx->width;
while (pixel_countdown > 0) {
*((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[pixel_ptr]);
pixel_ptr += 2;
}
}
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 = buf[stream_ptr++];
if (byte_run > 0) {
pixel = LE_16(&buf[stream_ptr]);
stream_ptr += 2;
CHECK_PIXEL_PTR(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(byte_run);
for (j = 0; j < byte_run; j++) {
*((signed short*)(&pixels[pixel_ptr])) = LE_16(&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])) = LE_16(&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,
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,
uint8_t *buf, int buf_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);
}
/* Shouldnt 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 Format of FLC. My Science cant explain how this happened\n");
return -1;
}
static int flic_decode_end(AVCodecContext *avctx)
{
FlicDecodeContext *s = avctx->priv_data;
@ -404,5 +737,8 @@ AVCodec flic_decoder = {
flic_decode_end,
flic_decode_frame,
CODEC_CAP_DR1,
NULL,
NULL,
NULL,
NULL
};

10
libavformat/flic.c
Unescape View File

@ -33,6 +33,8 @@
#define FLIC_FILE_MAGIC_1 0xAF11
#define FLIC_FILE_MAGIC_2 0xAF12
#define FLIC_FILE_MAGIC_3 0xAF44 /* Flic Type for Extended FLX Format which
originated in Dave's Targa Animator (DTA) */
#define FLIC_CHUNK_MAGIC_1 0xF1FA
#define FLIC_CHUNK_MAGIC_2 0xF5FA
#define FLIC_MC_PTS_INC 6000 /* pts increment for Magic Carpet game FLIs */
@ -56,7 +58,8 @@ static int flic_probe(AVProbeData *p)
magic_number = LE_16(&p->buf[4]);
if ((magic_number != FLIC_FILE_MAGIC_1) &&
(magic_number != FLIC_FILE_MAGIC_2))
(magic_number != FLIC_FILE_MAGIC_2) &&
(magic_number != FLIC_FILE_MAGIC_3))
return 0;
return AVPROBE_SCORE_MAX;
@ -129,7 +132,8 @@ static int flic_read_header(AVFormatContext *s,
* therefore, the frame pts increment = n * 1285.7
*/
flic->frame_pts_inc = speed * 1285.7;
} else if (magic_number == FLIC_FILE_MAGIC_2) {
} else if ((magic_number == FLIC_FILE_MAGIC_2) ||
(magic_number == FLIC_FILE_MAGIC_3)) {
/*
* in this case, the speed (n) is number of milliseconds between frames:
*
@ -206,7 +210,7 @@ static int flic_read_close(AVFormatContext *s)
static AVInputFormat flic_iformat = {
"flic",
"FLI/FLC animation format",
"FLI/FLC/FLX animation format",
sizeof(FlicDemuxContext),
flic_probe,
flic_read_header,

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