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exr: zip decompression 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2012-07-08 00:04:46 +00:00
parent 5ee41d00f6
commit 74f3c53b57
2 changed files with 148 additions and 37 deletions
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1
configure vendored
View File

@ -1467,6 +1467,7 @@ eac3_encoder_select="mdct ac3dsp"
eamad_decoder_select="aandct"
eatgq_decoder_select="aandct"
eatqi_decoder_select="aandct"
exr_decoder_select="zlib"
ffv1_decoder_select="golomb"
flac_decoder_select="golomb"
flac_encoder_select="golomb lpc"

150
libavcodec/exr.c
View File

@ -30,6 +30,8 @@
* exr_flt2uint() and exr_halflt2uint() is credited to Reimar Döffinger
*/
#include <zlib.h>
#include "avcodec.h"
#include "bytestream.h"
#include "libavutil/imgutils.h"
@ -40,7 +42,8 @@ enum ExrCompr {
EXR_ZIP1 = 2,
EXR_ZIP16 = 3,
EXR_PIZ = 4,
EXR_B44 = 6
EXR_B44 = 6,
EXR_B44A = 7,
};
typedef struct EXRContext {
@ -48,6 +51,12 @@ typedef struct EXRContext {
int compr;
int bits_per_color_id;
int8_t channel_offsets[4]; // 0 = red, 1 = green, 2 = blue and 3 = alpha
uint8_t *uncompressed_data;
int uncompressed_size;
uint8_t *tmp;
int tmp_size;;
} EXRContext;
/**
@ -142,6 +151,38 @@ static int check_header_variable(AVCodecContext *avctx,
return -1;
}
static void predictor(uint8_t *src, int size)
{
uint8_t *t = src + 1;
uint8_t *stop = src + size;
while (t < stop) {
int d = (int)t[-1] + (int)t[0] - 128;
t[0] = d;
++t;
}
}
static void reorder_pixels(uint8_t *src, uint8_t *dst, int size)
{
const int8_t *t1 = src;
const int8_t *t2 = src + (size + 1) / 2;
int8_t *s = dst;
int8_t *stop = s + size;
while (1) {
if (s < stop)
*(s++) = *(t1++);
else
break;
if (s < stop)
*(s++) = *(t2++);
else
break;
}
}
static int decode_frame(AVCodecContext *avctx,
void *data,
int *data_size,
@ -165,6 +206,10 @@ static int decode_frame(AVCodecContext *avctx,
unsigned int ymax = ~0;
unsigned int xdelta = ~0;
int scan_lines_per_block;
unsigned long scan_line_size;
unsigned long uncompressed_size;
unsigned int current_channel_offset = 0;
s->channel_offsets[0] = -1;
@ -319,10 +364,10 @@ static int decode_frame(AVCodecContext *avctx,
s->compr = *buf;
switch (s->compr) {
case EXR_RAW:
break;
case EXR_RLE:
case EXR_ZIP1:
case EXR_ZIP16:
break;
case EXR_RLE:
case EXR_PIZ:
case EXR_B44:
default:
@ -382,6 +427,16 @@ static int decode_frame(AVCodecContext *avctx,
return AVERROR_INVALIDDATA;
}
switch (s->compr) {
case EXR_RAW:
case EXR_ZIP1:
scan_lines_per_block = 1;
break;
case EXR_ZIP16:
scan_lines_per_block = 16;
break;
}
if (s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
if (av_image_check_size(w, h, 0, avctx))
@ -397,6 +452,16 @@ static int decode_frame(AVCodecContext *avctx,
avcodec_set_dimensions(avctx, w, h);
}
scan_line_size = xdelta * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components * FFMAX(2 * s->bits_per_color_id, 1);
uncompressed_size = scan_line_size * scan_lines_per_block;
if (s->compr != EXR_RAW) {
av_fast_padded_malloc(&s->uncompressed_data, &s->uncompressed_size, uncompressed_size);
av_fast_padded_malloc(&s->tmp, &s->tmp_size, uncompressed_size);
if (!s->uncompressed_data || !s->tmp)
return AVERROR(ENOMEM);
}
if ((ret = avctx->get_buffer(avctx, p)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
@ -411,26 +476,60 @@ static int decode_frame(AVCodecContext *avctx,
ptr += stride;
}
// Process the actual lines
for (y = ymin; y <= ymax; y++) {
// Process the actual scan line blocks
for (y = ymin; y <= ymax; y += scan_lines_per_block) {
uint16_t *ptr_x = (uint16_t *)ptr;
if (buf_end - buf > 8) {
/* Read the lineoffset from the line offset table and add 8 bytes
to skip the coordinates and data size fields */
const uint64_t line_offset = bytestream_get_le64(&buf) + 8;
int32_t data_size;
// Check if the buffer has the required bytes needed from the offset
if (line_offset > avpkt->size - xdelta * current_channel_offset) {
if ((line_offset > buf_size) ||
(s->compr == EXR_RAW && line_offset > avpkt->size - xdelta * current_channel_offset) ||
(s->compr != EXR_RAW && line_offset > buf_size - (data_size = AV_RL32(avpkt->data + line_offset - 4)))) {
// Line offset is probably wrong and not inside the buffer
av_log(avctx, AV_LOG_WARNING, "Line offset for line %d is out of reach setting it to black\n", y);
for (i = 0; i < scan_lines_per_block && y + i <= ymax; i++, ptr += stride) {
ptr_x = (uint16_t *)ptr;
memset(ptr_x, 0, avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
}
} else {
const uint8_t *red_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[0];
const uint8_t *green_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[1];
const uint8_t *blue_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[2];
const uint8_t *alpha_channel_buffer = 0;
const uint8_t *red_channel_buffer, *green_channel_buffer, *blue_channel_buffer, *alpha_channel_buffer = 0;
if ((s->compr == EXR_ZIP1 || s->compr == EXR_ZIP16) && data_size < uncompressed_size) {
if (uncompress(s->tmp, &uncompressed_size, avpkt->data + line_offset, data_size) != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
return AVERROR(EINVAL);
}
predictor(s->tmp, uncompressed_size);
reorder_pixels(s->tmp, s->uncompressed_data, uncompressed_size);
red_channel_buffer = s->uncompressed_data + xdelta * s->channel_offsets[0];
green_channel_buffer = s->uncompressed_data + xdelta * s->channel_offsets[1];
blue_channel_buffer = s->uncompressed_data + xdelta * s->channel_offsets[2];
if (s->channel_offsets[3] >= 0)
alpha_channel_buffer = s->uncompressed_data + xdelta * s->channel_offsets[3];
} else {
red_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[0];
green_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[1];
blue_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[2];
if (s->channel_offsets[3] >= 0)
alpha_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[3];
}
for (i = 0; i < scan_lines_per_block && y + i <= ymax; i++, ptr += stride) {
const uint8_t *r, *g, *b, *a;
r = red_channel_buffer;
g = green_channel_buffer;
b = blue_channel_buffer;
if (alpha_channel_buffer)
a = alpha_channel_buffer;
ptr_x = (uint16_t *)ptr;
// Zero out the start if xmin is not 0
memset(ptr_x, 0, xmin * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
@ -438,28 +537,33 @@ static int decode_frame(AVCodecContext *avctx,
if (s->bits_per_color_id == 2) {
// 32-bit
for (x = 0; x < xdelta; x++) {
*ptr_x++ = exr_flt2uint(bytestream_get_le32(&red_channel_buffer));
*ptr_x++ = exr_flt2uint(bytestream_get_le32(&green_channel_buffer));
*ptr_x++ = exr_flt2uint(bytestream_get_le32(&blue_channel_buffer));
*ptr_x++ = exr_flt2uint(bytestream_get_le32(&r));
*ptr_x++ = exr_flt2uint(bytestream_get_le32(&g));
*ptr_x++ = exr_flt2uint(bytestream_get_le32(&b));
if (alpha_channel_buffer)
*ptr_x++ = exr_flt2uint(bytestream_get_le32(&alpha_channel_buffer));
*ptr_x++ = exr_flt2uint(bytestream_get_le32(&a));
}
} else {
// 16-bit
for (x = 0; x < xdelta; x++) {
*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&red_channel_buffer));
*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&green_channel_buffer));
*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&blue_channel_buffer));
*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&r));
*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&g));
*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&b));
if (alpha_channel_buffer)
*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&alpha_channel_buffer));
*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&a));
}
}
// Zero out the end if xmax+1 is not w
memset(ptr_x, 0, (avctx->width - (xmax + 1)) * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
red_channel_buffer += scan_line_size;
green_channel_buffer += scan_line_size;
blue_channel_buffer += scan_line_size;
if (alpha_channel_buffer)
alpha_channel_buffer += scan_line_size;
}
}
// Move to next line
ptr += stride;
}
}
@ -478,17 +582,23 @@ static int decode_frame(AVCodecContext *avctx,
static av_cold int decode_init(AVCodecContext *avctx)
{
EXRContext *s = avctx->priv_data;
avcodec_get_frame_defaults(&s->picture);
avctx->coded_frame = &s->picture;
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
EXRContext *s = avctx->priv_data;
if (s->picture.data[0])
avctx->release_buffer(avctx, &s->picture);
av_freep(&s->uncompressed_data);
av_freep(&s->tmp);
return 0;
}