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HAM6/HAM8 support for IFF demuxer/decoder

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Sebastian Vater 2011-04-20 13:56:56 +02:00 • committed by Michael Niedermayer
parent c2a8f12585
commit 183132872a
2 changed files with 333 additions and 21 deletions
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276
libavcodec/iff.c
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@ -30,10 +30,72 @@
#include "avcodec.h"
#include "get_bits.h"
// TODO: masking bits
typedef enum {
MASK_NONE,
MASK_HAS_MASK,
MASK_HAS_TRANSPARENT_COLOR,
MASK_LASSO
} mask_type;
/**
* Gets the actual extra data after video preperties which contains
* the raw CMAP palette data beyond the IFF extra context.
*
* @param avctx the AVCodecContext where to extract raw palette data from
* @return pointer to raw CMAP palette data
*/
static av_always_inline uint8_t *get_palette_data(const AVCodecContext *const avctx) {
return avctx->extradata + AV_RB16(avctx->extradata);
}
/**
* Gets the size of CMAP palette data beyond the IFF extra context.
* Please note that any value < 2 of IFF extra context or
* raw extradata < 0 is considered as illegal extradata.
*
* @param avctx the AVCodecContext where to extract palette data size from
* @return size of raw palette data in bytes
*/
static av_always_inline int get_palette_size(const AVCodecContext *const avctx) {
return avctx->extradata_size - AV_RB16(avctx->extradata);
}
/**
* Gets the actual raw image data after video properties which
* contains the raw image data beyond the IFF extra context.
*
* @param avpkt the AVPacket where to extract raw image data from
* @return pointer to raw image data
*/
static av_always_inline uint8_t *get_image_data(const AVPacket *const avpkt) {
return avpkt->data + AV_RB16(avpkt->data);
}
/**
* Gets the size of raw image data beyond the IFF extra context.
* Please note that any value < 2 of either IFF extra context
* or raw image data is considered as an illegal packet.
*
* @param avpkt the AVPacket where to extract image data size from
* @return size of raw image data in bytes
*/
static av_always_inline int get_image_size(const AVPacket *const avpkt) {
return avpkt->size - AV_RB16(avpkt->data);
}
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;
@ -122,6 +184,7 @@ static av_always_inline uint32_t gray2rgb(const uint32_t x) {
static int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
{
int count, i;
const uint8_t *const extradata = get_palette_data(avctx);
if (avctx->bits_per_coded_sample > 8) {
av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
@ -130,10 +193,10 @@ static int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
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(get_palette_size(avctx) / 3, count);
if (count) {
for (i=0; i < count; i++) {
pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
pal[i] = 0xFF000000 | AV_RB24(extradata + i*3);
}
} else { // Create gray-scale color palette for bps < 8
count = 1 << avctx->bits_per_coded_sample;
@ -145,15 +208,123 @@ static int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
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;
if (avpkt) {
if (avpkt->size < 2)
return AVERROR_INVALIDDATA;
buf = avpkt->data;
buf_size = bytestream_get_be16(&buf);
if (buf_size <= 1 || get_image_size(avpkt) <= 1) {
av_log(avctx, AV_LOG_ERROR,
"Invalid image size received: %u -> image data offset: %d\n",
buf_size, get_image_size(avpkt));
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 || get_palette_size(avctx) < 0) {
av_log(avctx, AV_LOG_ERROR,
"Invalid palette size received: %u -> palette data offset: %d\n",
buf_size, get_palette_size(avctx));
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(get_palette_size(avctx) / 3, 1 << s->ham);
const uint8_t *const extradata = get_palette_data(avctx);
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(extradata + 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;
avctx->pix_fmt = (avctx->bits_per_coded_sample < 8) ||
(avctx->extradata_size >= 2 && get_palette_size(avctx)) ? PIX_FMT_PAL8
: PIX_FMT_GRAY8;
} else if (avctx->bits_per_coded_sample <= 32) {
avctx->pix_fmt = PIX_FMT_BGR32;
} else {
@ -167,6 +338,10 @@ static av_cold int decode_init(AVCodecContext *avctx)
if (!s->planebuf)
return AVERROR(ENOMEM);
s->bpp = avctx->bits_per_coded_sample;
if ((err = extract_header(avctx, NULL)) < 0)
return err;
s->frame.reference = 1;
return 0;
@ -214,6 +389,39 @@ static void decodeplane32(uint32_t *dst, const uint8_t *buf, int buf_size, int p
} 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.
*
@ -250,11 +458,14 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
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 ? get_image_data(avpkt) : NULL;
const int buf_size = avpkt->size >= 2 ? get_image_size(avpkt) : 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");
@ -274,16 +485,26 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
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;
}
@ -295,6 +516,13 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
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);
@ -307,11 +535,13 @@ static int decode_frame_byterun1(AVCodecContext *avctx,
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 ? get_image_data(avpkt) : NULL;
const int buf_size = avpkt->size >= 2 ? get_image_size(avpkt) : 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");
@ -331,26 +561,42 @@ static int decode_frame_byterun1(AVCodecContext *avctx,
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);
@ -364,6 +610,8 @@ static av_cold int decode_end(AVCodecContext *avctx)
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;
}