* IFF PBM/ILBM bitmap decoder
*/
+#include "libavutil/imgutils.h"
#include "bytestream.h"
#include "avcodec.h"
#include "get_bits.h"
-#include "iff.h"
+
+// TODO: masking bits
+typedef enum {
+ MASK_NONE,
+ MASK_HAS_MASK,
+ MASK_HAS_TRANSPARENT_COLOR,
+ MASK_LASSO
+} mask_type;
typedef struct {
AVFrame frame;
int planesize;
uint8_t * planebuf;
+ uint8_t * ham_buf; ///< temporary buffer for planar to chunky conversation
+ uint32_t *ham_palbuf; ///< HAM decode table
+ unsigned compression; ///< delta compression method used
+ unsigned bpp; ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
+ unsigned ham; ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
+ unsigned flags; ///< 1 for EHB, 0 is no extra half darkening
+ unsigned transparency; ///< TODO: transparency color index in palette
+ unsigned masking; ///< TODO: masking method used
int init; // 1 if buffer and palette data already initialized, 0 otherwise
} IffContext;
/**
* Convert CMAP buffer (stored in extradata) to lavc palette format
*/
-int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
+static int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
{
int count, i;
+ const uint8_t *const palette = avctx->extradata + AV_RB16(avctx->extradata);
+ int palette_size = avctx->extradata_size - AV_RB16(avctx->extradata);
if (avctx->bits_per_coded_sample > 8) {
av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
count = 1 << avctx->bits_per_coded_sample;
// If extradata is smaller than actually needed, fill the remaining with black.
- count = FFMIN(avctx->extradata_size / 3, count);
+ count = FFMIN(palette_size / 3, count);
if (count) {
for (i=0; i < count; i++) {
- pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
+ pal[i] = 0xFF000000 | AV_RB24(palette + i*3);
}
} else { // Create gray-scale color palette for bps < 8
count = 1 << avctx->bits_per_coded_sample;
return 0;
}
+/**
+ * Extracts the IFF extra context and updates internal
+ * decoder structures.
+ *
+ * @param avctx the AVCodecContext where to extract extra context to
+ * @param avpkt the AVPacket to extract extra context from or NULL to use avctx
+ * @return 0 in case of success, a negative error code otherwise
+ */
+static int extract_header(AVCodecContext *const avctx,
+ const AVPacket *const avpkt) {
+ const uint8_t *buf;
+ unsigned buf_size;
+ IffContext *s = avctx->priv_data;
+ int palette_size = avctx->extradata_size - AV_RB16(avctx->extradata);
+
+ if (avpkt) {
+ int image_size;
+ if (avpkt->size < 2)
+ return AVERROR_INVALIDDATA;
+ image_size = avpkt->size - AV_RB16(avpkt->data);
+ buf = avpkt->data;
+ buf_size = bytestream_get_be16(&buf);
+ if (buf_size <= 1 || image_size <= 1) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Invalid image size received: %u -> image data offset: %d\n",
+ buf_size, image_size);
+ return AVERROR_INVALIDDATA;
+ }
+ } else {
+ if (avctx->extradata_size < 2)
+ return AVERROR_INVALIDDATA;
+ buf = avctx->extradata;
+ buf_size = bytestream_get_be16(&buf);
+ if (buf_size <= 1 || palette_size < 0) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Invalid palette size received: %u -> palette data offset: %d\n",
+ buf_size, palette_size);
+ return AVERROR_INVALIDDATA;
+ }
+ }
+
+ if (buf_size > 8) {
+ s->compression = bytestream_get_byte(&buf);
+ s->bpp = bytestream_get_byte(&buf);
+ s->ham = bytestream_get_byte(&buf);
+ s->flags = bytestream_get_byte(&buf);
+ s->transparency = bytestream_get_be16(&buf);
+ s->masking = bytestream_get_byte(&buf);
+ if (s->masking == MASK_HAS_TRANSPARENT_COLOR) {
+ av_log(avctx, AV_LOG_ERROR, "Transparency not supported\n");
+ return AVERROR_PATCHWELCOME;
+ } else if (s->masking != MASK_NONE) {
+ av_log(avctx, AV_LOG_ERROR, "Masking not supported\n");
+ return AVERROR_PATCHWELCOME;
+ }
+ if (!s->bpp || s->bpp > 32) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid number of bitplanes: %u\n", s->bpp);
+ return AVERROR_INVALIDDATA;
+ } else if (s->ham >= 8) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid number of hold bits for HAM: %u\n", s->ham);
+ return AVERROR_INVALIDDATA;
+ }
+
+ av_freep(&s->ham_buf);
+ av_freep(&s->ham_palbuf);
+
+ if (s->ham) {
+ int i, count = FFMIN(palette_size / 3, 1 << s->ham);
+ const uint8_t *const palette = avctx->extradata + AV_RB16(avctx->extradata);
+ s->ham_buf = av_malloc((s->planesize * 8) + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!s->ham_buf)
+ return AVERROR(ENOMEM);
+
+ s->ham_palbuf = av_malloc((8 * (1 << s->ham) * sizeof (uint32_t)) + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!s->ham_palbuf) {
+ av_freep(&s->ham_buf);
+ return AVERROR(ENOMEM);
+ }
+
+ if (count) { // HAM with color palette attached
+ // prefill with black and palette and set HAM take direct value mask to zero
+ memset(s->ham_palbuf, 0, (1 << s->ham) * 2 * sizeof (uint32_t));
+ for (i=0; i < count; i++) {
+ s->ham_palbuf[i*2+1] = AV_RL24(palette + i*3);
+ }
+ count = 1 << s->ham;
+ } else { // HAM with grayscale color palette
+ count = 1 << s->ham;
+ for (i=0; i < count; i++) {
+ s->ham_palbuf[i*2] = 0; // take direct color value from palette
+ s->ham_palbuf[i*2+1] = av_le2ne32(gray2rgb((i * 255) >> s->ham));
+ }
+ }
+ for (i=0; i < count; i++) {
+ uint32_t tmp = i << (8 - s->ham);
+ tmp |= tmp >> s->ham;
+ s->ham_palbuf[(i+count)*2] = 0x00FFFF; // just modify blue color component
+ s->ham_palbuf[(i+count*2)*2] = 0xFFFF00; // just modify red color component
+ s->ham_palbuf[(i+count*3)*2] = 0xFF00FF; // just modify green color component
+ s->ham_palbuf[(i+count)*2+1] = tmp << 16;
+ s->ham_palbuf[(i+count*2)*2+1] = tmp;
+ s->ham_palbuf[(i+count*3)*2+1] = tmp << 8;
+ }
+ } else if (s->flags & 1) { // EHB (ExtraHalfBrite) color palette
+ av_log(avctx, AV_LOG_ERROR, "ExtraHalfBrite (EHB) mode not supported\n");
+ return AVERROR_PATCHWELCOME;
+ }
+ }
+
+ return 0;
+}
+
static av_cold int decode_init(AVCodecContext *avctx)
{
IffContext *s = avctx->priv_data;
int err;
if (avctx->bits_per_coded_sample <= 8) {
- avctx->pix_fmt = (avctx->bits_per_coded_sample < 8 ||
- avctx->extradata_size) ? PIX_FMT_PAL8
- : PIX_FMT_GRAY8;
+ int palette_size = avctx->extradata_size - AV_RB16(avctx->extradata);
+ avctx->pix_fmt = (avctx->bits_per_coded_sample < 8) ||
+ (avctx->extradata_size >= 2 && palette_size) ? PIX_FMT_PAL8 : PIX_FMT_GRAY8;
} else if (avctx->bits_per_coded_sample <= 32) {
avctx->pix_fmt = PIX_FMT_BGR32;
} else {
return AVERROR_INVALIDDATA;
}
- if ((err = avcodec_check_dimensions(avctx, avctx->width, avctx->height)))
+ if ((err = av_image_check_size(avctx->width, avctx->height, 0, avctx)))
return err;
s->planesize = FFALIGN(avctx->width, 16) >> 3; // Align plane size in bits to word-boundary
s->planebuf = av_malloc(s->planesize + FF_INPUT_BUFFER_PADDING_SIZE);
if (!s->planebuf)
return AVERROR(ENOMEM);
+ s->bpp = avctx->bits_per_coded_sample;
+ avcodec_get_frame_defaults(&s->frame);
+
+ if ((err = extract_header(avctx, NULL)) < 0)
+ return err;
s->frame.reference = 1;
return 0;
} while (--buf_size);
}
+#define DECODE_HAM_PLANE32(x) \
+ first = buf[x] << 1; \
+ second = buf[(x)+1] << 1; \
+ delta &= pal[first++]; \
+ delta |= pal[first]; \
+ dst[x] = delta; \
+ delta &= pal[second++]; \
+ delta |= pal[second]; \
+ dst[(x)+1] = delta
+
+/**
+ * Converts one line of HAM6/8-encoded chunky buffer to 24bpp.
+ *
+ * @param dst the destination 24bpp buffer
+ * @param buf the source 8bpp chunky buffer
+ * @param pal the HAM decode table
+ * @param buf_size the plane size in bytes
+ */
+static void decode_ham_plane32(uint32_t *dst, const uint8_t *buf,
+ const uint32_t *const pal, unsigned buf_size)
+{
+ uint32_t delta = 0;
+ do {
+ uint32_t first, second;
+ DECODE_HAM_PLANE32(0);
+ DECODE_HAM_PLANE32(2);
+ DECODE_HAM_PLANE32(4);
+ DECODE_HAM_PLANE32(6);
+ buf += 8;
+ dst += 8;
+ } while (--buf_size);
+}
+
/**
* Decode one complete byterun1 encoded line.
*
AVPacket *avpkt)
{
IffContext *s = avctx->priv_data;
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
+ const uint8_t *buf = avpkt->size >= 2 ? avpkt->data + AV_RB16(avpkt->data) : NULL;
+ const int buf_size = avpkt->size >= 2 ? avpkt->size - AV_RB16(avpkt->data) : 0;
const uint8_t *buf_end = buf+buf_size;
int y, plane, res;
+ if ((res = extract_header(avctx, avpkt)) < 0)
+ return res;
+
if (s->init) {
if ((res = avctx->reget_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
for(y = 0; y < avctx->height; y++ ) {
uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
memset(row, 0, avctx->width);
- for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
+ for (plane = 0; plane < s->bpp && buf < buf_end; plane++) {
decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), plane);
buf += s->planesize;
}
}
+ } else if (s->ham) { // HAM to PIX_FMT_BGR32
+ for (y = 0; y < avctx->height; y++) {
+ uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
+ memset(s->ham_buf, 0, avctx->width);
+ for (plane = 0; plane < s->bpp && buf < buf_end; plane++) {
+ decodeplane8(s->ham_buf, buf, FFMIN(s->planesize, buf_end - buf), plane);
+ buf += s->planesize;
+ }
+ decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, s->planesize);
+ }
} else { // PIX_FMT_BGR32
for(y = 0; y < avctx->height; y++ ) {
uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
memset(row, 0, avctx->width << 2);
- for (plane = 0; plane < avctx->bits_per_coded_sample && buf < buf_end; plane++) {
+ for (plane = 0; plane < s->bpp && buf < buf_end; plane++) {
decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), plane);
buf += s->planesize;
}
memcpy(row, buf, FFMIN(avctx->width, buf_end - buf));
buf += avctx->width + (avctx->width % 2); // padding if odd
}
+ } else { // IFF-PBM: HAM to PIX_FMT_BGR32
+ for (y = 0; y < avctx->height; y++) {
+ uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
+ memcpy(s->ham_buf, buf, FFMIN(avctx->width, buf_end - buf));
+ buf += avctx->width + (avctx->width & 1); // padding if odd
+ decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, avctx->width);
+ }
}
*data_size = sizeof(AVFrame);
AVPacket *avpkt)
{
IffContext *s = avctx->priv_data;
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
+ const uint8_t *buf = avpkt->size >= 2 ? avpkt->data + AV_RB16(avpkt->data) : NULL;
+ const int buf_size = avpkt->size >= 2 ? avpkt->size - AV_RB16(avpkt->data) : 0;
const uint8_t *buf_end = buf+buf_size;
int y, plane, res;
+ if ((res = extract_header(avctx, avpkt)) < 0)
+ return res;
if (s->init) {
if ((res = avctx->reget_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
for(y = 0; y < avctx->height ; y++ ) {
uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
memset(row, 0, avctx->width);
- for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
+ for (plane = 0; plane < s->bpp; plane++) {
buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);
decodeplane8(row, s->planebuf, s->planesize, plane);
}
}
+ } else if (s->ham) { // HAM to PIX_FMT_BGR32
+ for (y = 0; y < avctx->height ; y++) {
+ uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
+ memset(s->ham_buf, 0, avctx->width);
+ for (plane = 0; plane < s->bpp; plane++) {
+ buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);
+ decodeplane8(s->ham_buf, s->planebuf, s->planesize, plane);
+ }
+ decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, s->planesize);
+ }
} else { //PIX_FMT_BGR32
for(y = 0; y < avctx->height ; y++ ) {
uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
memset(row, 0, avctx->width << 2);
- for (plane = 0; plane < avctx->bits_per_coded_sample; plane++) {
+ for (plane = 0; plane < s->bpp; plane++) {
buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);
decodeplane32((uint32_t *) row, s->planebuf, s->planesize, plane);
}
}
}
- } else {
+ } else if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) { // IFF-PBM
for(y = 0; y < avctx->height ; y++ ) {
uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
buf += decode_byterun(row, avctx->width, buf, buf_end);
}
+ } else { // IFF-PBM: HAM to PIX_FMT_BGR32
+ for (y = 0; y < avctx->height ; y++) {
+ uint8_t *row = &s->frame.data[0][y*s->frame.linesize[0]];
+ buf += decode_byterun(s->ham_buf, avctx->width, buf, buf_end);
+ decode_ham_plane32((uint32_t *) row, s->ham_buf, s->ham_palbuf, avctx->width);
+ }
}
*data_size = sizeof(AVFrame);
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
av_freep(&s->planebuf);
+ av_freep(&s->ham_buf);
+ av_freep(&s->ham_palbuf);
return 0;
}
-AVCodec iff_ilbm_decoder = {
+AVCodec ff_iff_ilbm_decoder = {
"iff_ilbm",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_IFF_ILBM,
.long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
};
-AVCodec iff_byterun1_decoder = {
+AVCodec ff_iff_byterun1_decoder = {
"iff_byterun1",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_IFF_BYTERUN1,
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