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FFmpeg/libavcodec/iff.c
Reinhard Tartler 737eb5976f Merge libavcore into libavutil 
It is pretty hopeless that other considerable projects will adopt
libavutil alone in other projects. Projects that need small footprint
are better off with more specialized libraries such as gnulib or rather
just copy the necessary parts that they need. With this in mind, nobody
is helped by having libavutil and libavcore split. In order to ease
maintenance inside and around FFmpeg and to reduce confusion where to
put common code, avcore's functionality is merged (back) to avutil.

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
2011-02-15 16:18:21 +01:00

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/*
* IFF PBM/ILBM bitmap decoder
* Copyright (c) 2010 Peter Ross <pross@xvid.org>
* Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
*
* 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
* IFF PBM/ILBM bitmap decoder
*/
#include "libavutil/imgutils.h"
#include "bytestream.h"
#include "avcodec.h"
#include "get_bits.h"
typedef struct {
AVFrame frame;
int planesize;
uint8_t * planebuf;
int init; // 1 if buffer and palette data already initialized, 0 otherwise
} IffContext;
#define LUT8_PART(plane, v) \
AV_LE2NE64C(UINT64_C(0x0000000)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x1000000)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x0010000)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x1010000)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x0000100)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x1000100)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x0010100)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x1010100)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x0000001)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x1000001)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x0010001)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x1010001)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x0000101)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x1000101)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x0010101)<<32 | v) << plane, \
AV_LE2NE64C(UINT64_C(0x1010101)<<32 | v) << plane
#define LUT8(plane) { \
LUT8_PART(plane, 0x0000000), \
LUT8_PART(plane, 0x1000000), \
LUT8_PART(plane, 0x0010000), \
LUT8_PART(plane, 0x1010000), \
LUT8_PART(plane, 0x0000100), \
LUT8_PART(plane, 0x1000100), \
LUT8_PART(plane, 0x0010100), \
LUT8_PART(plane, 0x1010100), \
LUT8_PART(plane, 0x0000001), \
LUT8_PART(plane, 0x1000001), \
LUT8_PART(plane, 0x0010001), \
LUT8_PART(plane, 0x1010001), \
LUT8_PART(plane, 0x0000101), \
LUT8_PART(plane, 0x1000101), \
LUT8_PART(plane, 0x0010101), \
LUT8_PART(plane, 0x1010101), \
}
// 8 planes * 8-bit mask
static const uint64_t plane8_lut[8][256] = {
LUT8(0), LUT8(1), LUT8(2), LUT8(3),
LUT8(4), LUT8(5), LUT8(6), LUT8(7),
};
#define LUT32(plane) { \
0, 0, 0, 0, \
0, 0, 0, 1 << plane, \
0, 0, 1 << plane, 0, \
0, 0, 1 << plane, 1 << plane, \
0, 1 << plane, 0, 0, \
0, 1 << plane, 0, 1 << plane, \
0, 1 << plane, 1 << plane, 0, \
0, 1 << plane, 1 << plane, 1 << plane, \
1 << plane, 0, 0, 0, \
1 << plane, 0, 0, 1 << plane, \
1 << plane, 0, 1 << plane, 0, \
1 << plane, 0, 1 << plane, 1 << plane, \
1 << plane, 1 << plane, 0, 0, \
1 << plane, 1 << plane, 0, 1 << plane, \
1 << plane, 1 << plane, 1 << plane, 0, \
1 << plane, 1 << plane, 1 << plane, 1 << plane, \
}
// 32 planes * 4-bit mask * 4 lookup tables each
static const uint32_t plane32_lut[32][16*4] = {
LUT32( 0), LUT32( 1), LUT32( 2), LUT32( 3),
LUT32( 4), LUT32( 5), LUT32( 6), LUT32( 7),
LUT32( 8), LUT32( 9), LUT32(10), LUT32(11),
LUT32(12), LUT32(13), LUT32(14), LUT32(15),
LUT32(16), LUT32(17), LUT32(18), LUT32(19),
LUT32(20), LUT32(21), LUT32(22), LUT32(23),
LUT32(24), LUT32(25), LUT32(26), LUT32(27),
LUT32(28), LUT32(29), LUT32(30), LUT32(31),
};
// Gray to RGB, required for palette table of grayscale images with bpp < 8
static av_always_inline uint32_t gray2rgb(const uint32_t x) {
return x << 16 | x << 8 | x;
}
/**
* Convert CMAP buffer (stored in extradata) to lavc palette format
*/
static int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
{
int count, i;
if (avctx->bits_per_coded_sample > 8) {
av_log(avctx, AV_LOG_ERROR, "bit_per_coded_sample > 8 not supported\n");
return AVERROR_INVALIDDATA;
}
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);
if (count) {
for (i=0; i < count; i++) {
pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
}
} else { // Create gray-scale color palette for bps < 8
count = 1 << avctx->bits_per_coded_sample;
for (i=0; i < count; i++) {
pal[i] = 0xFF000000 | gray2rgb((i * 255) >> avctx->bits_per_coded_sample);
}
}
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;
} else if (avctx->bits_per_coded_sample <= 32) {
avctx->pix_fmt = PIX_FMT_BGR32;
} else {
return AVERROR_INVALIDDATA;
}
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->frame.reference = 1;
return 0;
}
/**
* Decode interleaved plane buffer up to 8bpp
* @param dst Destination buffer
* @param buf Source buffer
* @param buf_size
* @param plane plane number to decode as
*/
static void decodeplane8(uint8_t *dst, const uint8_t *buf, int buf_size, int plane)
{
const uint64_t *lut = plane8_lut[plane];
do {
uint64_t v = AV_RN64A(dst) | lut[*buf++];
AV_WN64A(dst, v);
dst += 8;
} while (--buf_size);
}
/**
* Decode interleaved plane buffer up to 24bpp
* @param dst Destination buffer
* @param buf Source buffer
* @param buf_size
* @param plane plane number to decode as
*/
static void decodeplane32(uint32_t *dst, const uint8_t *buf, int buf_size, int plane)
{
const uint32_t *lut = plane32_lut[plane];
do {
unsigned mask = (*buf >> 2) & ~3;
dst[0] |= lut[mask++];
dst[1] |= lut[mask++];
dst[2] |= lut[mask++];
dst[3] |= lut[mask];
mask = (*buf++ << 2) & 0x3F;
dst[4] |= lut[mask++];
dst[5] |= lut[mask++];
dst[6] |= lut[mask++];
dst[7] |= lut[mask];
dst += 8;
} while (--buf_size);
}
/**
* Decode one complete byterun1 encoded line.
*
* @param dst the destination buffer where to store decompressed bitstream
* @param dst_size the destination plane size in bytes
* @param buf the source byterun1 compressed bitstream
* @param buf_end the EOF of source byterun1 compressed bitstream
* @return number of consumed bytes in byterun1 compressed bitstream
*/
static int decode_byterun(uint8_t *dst, int dst_size,
const uint8_t *buf, const uint8_t *const buf_end) {
const uint8_t *const buf_start = buf;
unsigned x;
for (x = 0; x < dst_size && buf < buf_end;) {
unsigned length;
const int8_t value = *buf++;
if (value >= 0) {
length = value + 1;
memcpy(dst + x, buf, FFMIN3(length, dst_size - x, buf_end - buf));
buf += length;
} else if (value > -128) {
length = -value + 1;
memset(dst + x, *buf++, FFMIN(length, dst_size - x));
} else { // noop
continue;
}
x += length;
}
return buf - buf_start;
}
static int decode_frame_ilbm(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
IffContext *s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
const uint8_t *buf_end = buf+buf_size;
int y, plane, res;
if (s->init) {
if ((res = avctx->reget_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return res;
}
} else if ((res = avctx->get_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return res;
} else if (avctx->bits_per_coded_sample <= 8 && avctx->pix_fmt != PIX_FMT_GRAY8) {
if ((res = ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1])) < 0)
return res;
}
s->init = 1;
if (avctx->codec_tag == MKTAG('I','L','B','M')) { // interleaved
if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) {
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++) {
decodeplane8(row, buf, FFMIN(s->planesize, buf_end - buf), plane);
buf += 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++) {
decodeplane32((uint32_t *) row, buf, FFMIN(s->planesize, buf_end - buf), plane);
buf += s->planesize;
}
}
}
} 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]];
memcpy(row, buf, FFMIN(avctx->width, buf_end - buf));
buf += avctx->width + (avctx->width % 2); // padding if odd
}
}
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
return buf_size;
}
static int decode_frame_byterun1(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
IffContext *s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
const uint8_t *buf_end = buf+buf_size;
int y, plane, res;
if (s->init) {
if ((res = avctx->reget_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return res;
}
} else if ((res = avctx->get_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return res;
} else if (avctx->bits_per_coded_sample <= 8 && avctx->pix_fmt != PIX_FMT_GRAY8) {
if ((res = ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1])) < 0)
return res;
}
s->init = 1;
if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) {
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++) {
buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);
decodeplane8(row, s->planebuf, s->planesize, plane);
}
}
} 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++) {
buf += decode_byterun(s->planebuf, s->planesize, buf, buf_end);
decodeplane32((uint32_t *) row, s->planebuf, s->planesize, plane);
}
}
}
} else {
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);
}
}
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
return buf_size;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
IffContext *s = avctx->priv_data;
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
av_freep(&s->planebuf);
return 0;
}
AVCodec ff_iff_ilbm_decoder = {
"iff_ilbm",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_IFF_ILBM,
sizeof(IffContext),
decode_init,
NULL,
decode_end,
decode_frame_ilbm,
CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("IFF ILBM"),
};
AVCodec ff_iff_byterun1_decoder = {
"iff_byterun1",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_IFF_BYTERUN1,
sizeof(IffContext),
decode_init,
NULL,
decode_end,
decode_frame_byterun1,
CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("IFF ByteRun1"),
};
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