[FFmpeg-cvslog] lavc/cfhd: interlaced frame decoding added
Gagandeep Singh
git at videolan.org
Sun May 27 17:25:06 EEST 2018
ffmpeg | branch: master | Gagandeep Singh <deepgagan231197 at gmail.com> | Tue May 22 21:28:21 2018 +0530| [9cefb9e7ec508900ba147e6977590f03456aa15c] | committer: Kieran Kunhya
lavc/cfhd: interlaced frame decoding added
ticket #5522 output of given samples significantly improved
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9cefb9e7ec508900ba147e6977590f03456aa15c
---
libavcodec/cfhd.c | 181 +++++++++++++++++++++++++++++++++++++++++++-----------
libavcodec/cfhd.h | 9 +++
2 files changed, 155 insertions(+), 35 deletions(-)
diff --git a/libavcodec/cfhd.c b/libavcodec/cfhd.c
index 7ceb803595..051d210355 100644
--- a/libavcodec/cfhd.c
+++ b/libavcodec/cfhd.c
@@ -49,12 +49,15 @@ enum CFHDParam {
SubbandNumber = 48,
Quantization = 53,
ChannelNumber = 62,
+ SampleFlags = 68,
BitsPerComponent = 101,
ChannelWidth = 104,
ChannelHeight = 105,
PrescaleShift = 109,
};
+
+
static av_cold int cfhd_init(AVCodecContext *avctx)
{
CFHDContext *s = avctx->priv_data;
@@ -72,6 +75,13 @@ static void init_plane_defaults(CFHDContext *s)
s->subband_num_actual = 0;
}
+static void init_peak_table_defaults(CFHDContext *s)
+{
+ s->peak.level = 0;
+ s->peak.offset = 0;
+ s->peak.base = NULL;
+}
+
static void init_frame_defaults(CFHDContext *s)
{
s->coded_width = 0;
@@ -86,15 +96,44 @@ static void init_frame_defaults(CFHDContext *s)
s->wavelet_depth = 3;
s->pshift = 1;
s->codebook = 0;
+ s->difference_coding = 0;
+ s->progressive = 0;
init_plane_defaults(s);
+ init_peak_table_defaults(s);
}
/* TODO: merge with VLC tables or use LUT */
-static inline int dequant_and_decompand(int level, int quantisation)
+static inline int dequant_and_decompand(int level, int quantisation, int codebook)
+{
+ if (codebook == 0 || codebook == 1) {
+ int64_t abslevel = abs(level);
+ if (level < 264)
+ return (abslevel + ((768 * abslevel * abslevel * abslevel) / (255 * 255 * 255))) *
+ FFSIGN(level) * quantisation;
+ else
+ return level * quantisation;
+ } else
+ return level * quantisation;
+}
+
+static inline void difference_coding(int16_t *band, int width, int height)
+{
+
+ int i,j;
+ for (i = 0; i < height; i++) {
+ for (j = 1; j < width; j++) {
+ band[j] += band[j-1];
+ }
+ band += width;
+ }
+}
+
+static inline void peak_table(int16_t *band, Peak *peak, int length)
{
- int64_t abslevel = abs(level);
- return (abslevel + ((768 * abslevel * abslevel * abslevel) / (255 * 255 * 255))) *
- FFSIGN(level) * quantisation;
+ int i;
+ for (i = 0; i < length; i++)
+ if (abs(band[i]) > peak->level)
+ band[i] = *(peak->base++);
}
static inline void process_alpha(int16_t *alpha, int width)
@@ -154,6 +193,18 @@ static inline void filter(int16_t *output, ptrdiff_t out_stride,
}
}
+static inline void interlaced_vertical_filter(int16_t *output, int16_t *low, int16_t *high,
+ int width, int linesize, int plane)
+{
+ int i;
+ int16_t even, odd;
+ for (i = 0; i < width; i++) {
+ even = (low[i] - high[i])/2;
+ odd = (low[i] + high[i])/2;
+ output[i] = av_clip_uintp2(even, 10);
+ output[i + linesize] = av_clip_uintp2(odd, 10);
+ }
+}
static void horiz_filter(int16_t *output, int16_t *low, int16_t *high,
int width)
{
@@ -295,6 +346,9 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
uint16_t data = bytestream2_get_be16(&gb);
if (abs_tag8 >= 0x60 && abs_tag8 <= 0x6f) {
av_log(avctx, AV_LOG_DEBUG, "large len %x\n", ((tagu & 0xff) << 16) | data);
+ } else if (tag == SampleFlags) {
+ av_log(avctx, AV_LOG_DEBUG, "Progressive?%"PRIu16"\n", data);
+ s->progressive = data & 0x0001;
} else if (tag == ImageWidth) {
av_log(avctx, AV_LOG_DEBUG, "Width %"PRIu16"\n", data);
s->coded_width = data;
@@ -393,6 +447,8 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
}
av_log(avctx, AV_LOG_DEBUG, "Transform-type? %"PRIu16"\n", data);
} else if (abstag >= 0x4000 && abstag <= 0x40ff) {
+ if (abstag == 0x4001)
+ s->peak.level = 0;
av_log(avctx, AV_LOG_DEBUG, "Small chunk length %d %s\n", data * 4, tag < 0 ? "optional" : "required");
bytestream2_skipu(&gb, data * 4);
} else if (tag == 23) {
@@ -450,7 +506,8 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
s->codebook = data;
av_log(avctx, AV_LOG_DEBUG, "Codebook %i\n", s->codebook);
} else if (tag == 72) {
- s->codebook = data;
+ s->codebook = data & 0xf;
+ s->difference_coding = (data >> 4) & 1;
av_log(avctx, AV_LOG_DEBUG, "Other codebook? %i\n", s->codebook);
} else if (tag == 70) {
av_log(avctx, AV_LOG_DEBUG, "Subsampling or bit-depth flag? %i\n", data);
@@ -477,6 +534,19 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
} else if (tag == -85) {
av_log(avctx, AV_LOG_DEBUG, "Cropped height %"PRIu16"\n", data);
s->cropped_height = data;
+ } else if (tag == -75) {
+ s->peak.offset &= ~0xffff;
+ s->peak.offset |= (data & 0xffff);
+ s->peak.base = (int16_t *) gb.buffer;
+ s->peak.level = 0;
+ } else if (tag == -76) {
+ s->peak.offset &= 0xffff;
+ s->peak.offset |= (data & 0xffff)<<16;
+ s->peak.base = (int16_t *) gb.buffer;
+ s->peak.level = 0;
+ } else if (tag == -74 && s->peak.offset) {
+ s->peak.level = data;
+ s->peak.base += s->peak.offset / 2 - 2;
} else
av_log(avctx, AV_LOG_DEBUG, "Unknown tag %i data %x\n", tag, data);
@@ -594,10 +664,15 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
if (count > expected)
break;
- coeff = dequant_and_decompand(level, s->quantisation);
+ coeff = dequant_and_decompand(level, s->quantisation, 0);
for (i = 0; i < run; i++)
*coeff_data++ = coeff;
}
+ if (s->peak.level)
+ peak_table(coeff_data - expected, &s->peak, expected);
+ if (s->difference_coding)
+ difference_coding(s->plane[s->channel_num].subband[s->subband_num_actual], highpass_width, highpass_height);
+
} else {
while (1) {
UPDATE_CACHE(re, &s->gb);
@@ -613,10 +688,15 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
if (count > expected)
break;
- coeff = dequant_and_decompand(level, s->quantisation);
+ coeff = dequant_and_decompand(level, s->quantisation, s->codebook);
for (i = 0; i < run; i++)
*coeff_data++ = coeff;
}
+ if (s->peak.level)
+ peak_table(coeff_data - expected, &s->peak, expected);
+ if (s->difference_coding)
+ difference_coding(s->plane[s->channel_num].subband[s->subband_num_actual], highpass_width, highpass_height);
+
}
CLOSE_READER(re, &s->gb);
}
@@ -784,37 +864,68 @@ static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
}
av_log(avctx, AV_LOG_DEBUG, "Level 3 plane %i %i %i %i\n", plane, lowpass_height, lowpass_width, highpass_stride);
+ if (s->progressive) {
+ low = s->plane[plane].subband[0];
+ high = s->plane[plane].subband[8];
+ output = s->plane[plane].l_h[6];
+ for (i = 0; i < lowpass_width; i++) {
+ vert_filter(output, lowpass_width, low, lowpass_width, high, highpass_stride, lowpass_height);
+ low++;
+ high++;
+ output++;
+ }
- low = s->plane[plane].subband[0];
- high = s->plane[plane].subband[8];
- output = s->plane[plane].l_h[6];
- for (i = 0; i < lowpass_width; i++) {
- vert_filter(output, lowpass_width, low, lowpass_width, high, highpass_stride, lowpass_height);
- low++;
- high++;
- output++;
- }
+ low = s->plane[plane].subband[7];
+ high = s->plane[plane].subband[9];
+ output = s->plane[plane].l_h[7];
+ for (i = 0; i < lowpass_width; i++) {
+ vert_filter(output, lowpass_width, low, highpass_stride, high, highpass_stride, lowpass_height);
+ low++;
+ high++;
+ output++;
+ }
- low = s->plane[plane].subband[7];
- high = s->plane[plane].subband[9];
- output = s->plane[plane].l_h[7];
- for (i = 0; i < lowpass_width; i++) {
- vert_filter(output, lowpass_width, low, highpass_stride, high, highpass_stride, lowpass_height);
- low++;
- high++;
- output++;
- }
+ dst = (int16_t *)pic->data[act_plane];
+ low = s->plane[plane].l_h[6];
+ high = s->plane[plane].l_h[7];
+ for (i = 0; i < lowpass_height * 2; i++) {
+ horiz_filter_clip(dst, low, high, lowpass_width, s->bpc);
+ low += lowpass_width;
+ high += lowpass_width;
+ dst += pic->linesize[act_plane] / 2;
+ }
+ } else {
+ av_log(avctx, AV_LOG_DEBUG, "interlaced frame ? %d", pic->interlaced_frame);
+ pic->interlaced_frame = 1;
+ low = s->plane[plane].subband[0];
+ high = s->plane[plane].subband[7];
+ output = s->plane[plane].l_h[6];
+ for (i = 0; i < lowpass_height; i++) {
+ horiz_filter(output, low, high, lowpass_width);
+ low += lowpass_width;
+ high += lowpass_width;
+ output += lowpass_width * 2;
+ }
- dst = (int16_t *)pic->data[act_plane];
- low = s->plane[plane].l_h[6];
- high = s->plane[plane].l_h[7];
- for (i = 0; i < lowpass_height * 2; i++) {
- horiz_filter_clip(dst, low, high, lowpass_width, s->bpc);
- if (act_plane == 3)
- process_alpha(dst, lowpass_width * 2);
- low += lowpass_width;
- high += lowpass_width;
- dst += pic->linesize[act_plane] / 2;
+ low = s->plane[plane].subband[8];
+ high = s->plane[plane].subband[9];
+ output = s->plane[plane].l_h[7];
+ for (i = 0; i < lowpass_height; i++) {
+ horiz_filter(output, low, high, lowpass_width);
+ low += lowpass_width;
+ high += lowpass_width;
+ output += lowpass_width * 2;
+ }
+
+ dst = (int16_t *)pic->data[act_plane];
+ low = s->plane[plane].l_h[6];
+ high = s->plane[plane].l_h[7];
+ for (i = 0; i < lowpass_height; i++) {
+ interlaced_vertical_filter(dst, low, high, lowpass_width * 2, pic->linesize[act_plane]/2, act_plane);
+ low += lowpass_width * 2;
+ high += lowpass_width * 2;
+ dst += pic->linesize[act_plane];
+ }
}
}
diff --git a/libavcodec/cfhd.h b/libavcodec/cfhd.h
index 2573e750a6..7cd251fca7 100644
--- a/libavcodec/cfhd.h
+++ b/libavcodec/cfhd.h
@@ -68,6 +68,12 @@ typedef struct Plane {
SubBand band[DWT_LEVELS][4];
} Plane;
+typedef struct Peak {
+ int level;
+ int offset;
+ const int16_t *base;
+} Peak;
+
typedef struct CFHDContext {
AVCodecContext *avctx;
@@ -83,6 +89,7 @@ typedef struct CFHDContext {
int coded_height;
int cropped_height;
enum AVPixelFormat coded_format;
+ int progressive;
int a_width;
int a_height;
@@ -98,12 +105,14 @@ typedef struct CFHDContext {
int pshift;
int codebook;
+ int difference_coding;
int subband_num;
int level;
int subband_num_actual;
uint8_t prescale_shift[3];
Plane plane[4];
+ Peak peak;
} CFHDContext;
int ff_cfhd_init_vlcs(CFHDContext *s);
More information about the ffmpeg-cvslog
mailing list