X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavutil%2Fpixdesc.h;h=1c9e0af11f315ad6daf05f46c8bd902d8afd778e;hb=cc3e88a2b9e7ecf62e4ea1c41ce1623cea67ee96;hp=1fa571f4053fdded482cb0b3a344333b8c871e7b;hpb=80a07f6e47a842ca351ebec3478878204cd1d0b7;p=ffmpeg

diff --git a/libavutil/pixdesc.h b/libavutil/pixdesc.h
index 1fa571f4053..1c9e0af11f3 100644
--- a/libavutil/pixdesc.h
+++ b/libavutil/pixdesc.h
@@ -2,20 +2,20 @@
  * pixel format descriptor
  * Copyright (c) 2009 Michael Niedermayer <michaelni@gmx.at>
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -24,25 +24,38 @@
 
 #include <inttypes.h>
 
-#include "intreadwrite.h"
+#include "attributes.h"
+#include "pixfmt.h"
 
-typedef struct AVComponentDescriptor{
-    uint16_t plane        :2;            ///< which of the 4 planes contains the component
+typedef struct AVComponentDescriptor {
+    /**
+     * Which of the 4 planes contains the component.
+     */
+    uint16_t plane        : 2;
 
     /**
      * Number of elements between 2 horizontally consecutive pixels minus 1.
      * Elements are bits for bitstream formats, bytes otherwise.
      */
-    uint16_t step_minus1  :3;
+    uint16_t step_minus1  : 3;
 
     /**
      * Number of elements before the component of the first pixel plus 1.
      * Elements are bits for bitstream formats, bytes otherwise.
      */
-    uint16_t offset_plus1 :3;
-    uint16_t shift        :3;            ///< number of least significant bits that must be shifted away to get the value
-    uint16_t depth_minus1 :4;            ///< number of bits in the component minus 1
-}AVComponentDescriptor;
+    uint16_t offset_plus1 : 3;
+
+    /**
+     * Number of least significant bits that must be shifted away
+     * to get the value.
+     */
+    uint16_t shift        : 3;
+
+    /**
+     * Number of bits in the component minus 1.
+     */
+    uint16_t depth_minus1 : 4;
+} AVComponentDescriptor;
 
 /**
  * Descriptor that unambiguously describes how the bits of a pixel are
@@ -53,9 +66,9 @@ typedef struct AVComponentDescriptor{
  *       and all the YUV variants) AVPixFmtDescriptor just stores how values
  *       are stored not what these values represent.
  */
-typedef struct AVPixFmtDescriptor{
+typedef struct AVPixFmtDescriptor {
     const char *name;
-    uint8_t nb_components;      ///< The number of components each pixel has, (1-4)
+    uint8_t nb_components;  ///< The number of components each pixel has, (1-4)
 
     /**
      * Amount to shift the luma width right to find the chroma width.
@@ -64,7 +77,7 @@ typedef struct AVPixFmtDescriptor{
      * The note above is needed to ensure rounding up.
      * This value only refers to the chroma components.
      */
-    uint8_t log2_chroma_w;      ///< chroma_width = -((-luma_width )>>log2_chroma_w)
+    uint8_t log2_chroma_w;  ///< chroma_width = -((-luma_width )>>log2_chroma_w)
 
     /**
      * Amount to shift the luma height right to find the chroma height.
@@ -82,128 +95,109 @@ typedef struct AVPixFmtDescriptor{
      * comp[2].
      */
     AVComponentDescriptor comp[4];
-}AVPixFmtDescriptor;
 
-#define PIX_FMT_BE        1 ///< Pixel format is big-endian.
-#define PIX_FMT_PAL       2 ///< Pixel format has a palette in data[1], values are indexes in this palette.
-#define PIX_FMT_BITSTREAM 4 ///< All values of a component are bit-wise packed end to end.
-#define PIX_FMT_HWACCEL   8 ///< Pixel format is an HW accelerated format.
+    /**
+     * Alternative comma-separated names.
+     */
+    const char *alias;
+} AVPixFmtDescriptor;
 
+/**
+ * Pixel format is big-endian.
+ */
+#define AV_PIX_FMT_FLAG_BE           (1 << 0)
+/**
+ * Pixel format has a palette in data[1], values are indexes in this palette.
+ */
+#define AV_PIX_FMT_FLAG_PAL          (1 << 1)
+/**
+ * All values of a component are bit-wise packed end to end.
+ */
+#define AV_PIX_FMT_FLAG_BITSTREAM    (1 << 2)
+/**
+ * Pixel format is an HW accelerated format.
+ */
+#define AV_PIX_FMT_FLAG_HWACCEL      (1 << 3)
+/**
+ * At least one pixel component is not in the first data plane.
+ */
+#define AV_PIX_FMT_FLAG_PLANAR       (1 << 4)
+/**
+ * The pixel format contains RGB-like data (as opposed to YUV/grayscale).
+ */
+#define AV_PIX_FMT_FLAG_RGB          (1 << 5)
+/**
+ * The pixel format is "pseudo-paletted". This means that Libav treats it as
+ * paletted internally, but the palette is generated by the decoder and is not
+ * stored in the file.
+ */
+#define AV_PIX_FMT_FLAG_PSEUDOPAL    (1 << 6)
+/**
+ * The pixel format has an alpha channel.
+ */
+#define AV_PIX_FMT_FLAG_ALPHA        (1 << 7)
+
+#if FF_API_PIX_FMT
+/**
+ * @deprecated use the AV_PIX_FMT_FLAG_* flags
+ */
+#define PIX_FMT_BE        AV_PIX_FMT_FLAG_BE
+#define PIX_FMT_PAL       AV_PIX_FMT_FLAG_PAL
+#define PIX_FMT_BITSTREAM AV_PIX_FMT_FLAG_BITSTREAM
+#define PIX_FMT_HWACCEL   AV_PIX_FMT_FLAG_HWACCEL
+#define PIX_FMT_PLANAR    AV_PIX_FMT_FLAG_PLANAR
+#define PIX_FMT_RGB       AV_PIX_FMT_FLAG_RGB
+#define PIX_FMT_PSEUDOPAL AV_PIX_FMT_FLAG_PSEUDOPAL
+#define PIX_FMT_ALPHA     AV_PIX_FMT_FLAG_ALPHA
+#endif
+
+#if FF_API_PIX_FMT_DESC
 /**
  * The array of all the pixel format descriptors.
  */
-extern const AVPixFmtDescriptor av_pix_fmt_descriptors[];
+extern attribute_deprecated const AVPixFmtDescriptor av_pix_fmt_descriptors[];
+#endif
 
 /**
- * Reads a line from an image, and writes to dst the values of the
- * pixel format component c.
+ * Read a line from an image, and write the values of the
+ * pixel format component c to dst.
  *
  * @param data the array containing the pointers to the planes of the image
- * @param linesizes the array containing the linesizes of the image
+ * @param linesize the array containing the linesizes of the image
  * @param desc the pixel format descriptor for the image
  * @param x the horizontal coordinate of the first pixel to read
  * @param y the vertical coordinate of the first pixel to read
  * @param w the width of the line to read, that is the number of
  * values to write to dst
  * @param read_pal_component if not zero and the format is a paletted
- * format writes to dst the values corresponding to the palette
- * component c in data[1], rather than the palette indexes in
+ * format writes the values corresponding to the palette
+ * component c in data[1] to dst, rather than the palette indexes in
  * data[0]. The behavior is undefined if the format is not paletted.
  */
-static inline void read_line(uint16_t *dst, const uint8_t *data[4], const int linesize[4],
-                             const AVPixFmtDescriptor *desc, int x, int y, int c, int w, int read_pal_component)
-{
-    AVComponentDescriptor comp= desc->comp[c];
-    int plane= comp.plane;
-    int depth= comp.depth_minus1+1;
-    int mask = (1<<depth)-1;
-    int shift= comp.shift;
-    int step = comp.step_minus1+1;
-    int flags= desc->flags;
-
-    if (flags & PIX_FMT_BITSTREAM){
-        int skip = x*step + comp.offset_plus1-1;
-        const uint8_t *p = data[plane] + y*linesize[plane] + (skip>>3);
-        int shift = 8 - depth - (skip&7);
-
-        while(w--){
-            int val = (*p >> shift) & mask;
-            if(read_pal_component)
-                val= data[1][4*val + c];
-            shift -= step;
-            p -= shift>>3;
-            shift &= 7;
-            *dst++= val;
-        }
-    } else {
-        const uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
-
-        while(w--){
-            int val;
-            if(flags & PIX_FMT_BE) val= AV_RB16(p);
-            else                   val= AV_RL16(p);
-            val = (val>>shift) & mask;
-            if(read_pal_component)
-                val= data[1][4*val + c];
-            p+= step;
-            *dst++= val;
-        }
-    }
-}
-
-/**
- * Writes the values from src to the pixel format component c of an
+void av_read_image_line(uint16_t *dst, const uint8_t *data[4],
+                        const int linesize[4], const AVPixFmtDescriptor *desc,
+                        int x, int y, int c, int w, int read_pal_component);
+
+/**
+ * Write the values from src to the pixel format component c of an
  * image line.
  *
  * @param src array containing the values to write
  * @param data the array containing the pointers to the planes of the
  * image to write into. It is supposed to be zeroed.
- * @param linesizes the array containing the linesizes of the image
+ * @param linesize the array containing the linesizes of the image
  * @param desc the pixel format descriptor for the image
  * @param x the horizontal coordinate of the first pixel to write
  * @param y the vertical coordinate of the first pixel to write
  * @param w the width of the line to write, that is the number of
  * values to write to the image line
  */
-static inline void write_line(const uint16_t *src, uint8_t *data[4], const int linesize[4],
-                              const AVPixFmtDescriptor *desc, int x, int y, int c, int w)
-{
-    AVComponentDescriptor comp = desc->comp[c];
-    int plane = comp.plane;
-    int depth = comp.depth_minus1+1;
-    int step  = comp.step_minus1+1;
-    int flags = desc->flags;
-
-    if (flags & PIX_FMT_BITSTREAM) {
-        int skip = x*step + comp.offset_plus1-1;
-        uint8_t *p = data[plane] + y*linesize[plane] + (skip>>3);
-        int shift = 8 - depth - (skip&7);
-
-        while (w--) {
-            *p |= *src++ << shift;
-            shift -= step;
-            p -= shift>>3;
-            shift &= 7;
-        }
-    } else {
-        int shift = comp.shift;
-        uint8_t *p = data[plane]+ y*linesize[plane] + x*step + comp.offset_plus1-1;
-
-        while (w--) {
-            if (flags & PIX_FMT_BE) {
-                uint16_t val = AV_RB16(p) | (*src++<<shift);
-                AV_WB16(p, val);
-            } else {
-                uint16_t val = AV_RL16(p) | (*src++<<shift);
-                AV_WL16(p, val);
-            }
-            p+= step;
-        }
-    }
-}
-
-/**
- * Returns the pixel format corresponding to name.
+void av_write_image_line(const uint16_t *src, uint8_t *data[4],
+                         const int linesize[4], const AVPixFmtDescriptor *desc,
+                         int x, int y, int c, int w);
+
+/**
+ * Return the pixel format corresponding to name.
  *
  * If there is no pixel format with name name, then looks for a
  * pixel format with the name corresponding to the native endian
@@ -213,11 +207,33 @@ static inline void write_line(const uint16_t *src, uint8_t *data[4], const int l
  *
  * Finally if no pixel format has been found, returns PIX_FMT_NONE.
  */
-enum PixelFormat av_get_pix_fmt(const char *name);
+enum AVPixelFormat av_get_pix_fmt(const char *name);
+
+/**
+ * Return the short name for a pixel format, NULL in case pix_fmt is
+ * unknown.
+ *
+ * @see av_get_pix_fmt(), av_get_pix_fmt_string()
+ */
+const char *av_get_pix_fmt_name(enum AVPixelFormat pix_fmt);
+
+/**
+ * Print in buf the string corresponding to the pixel format with
+ * number pix_fmt, or an header if pix_fmt is negative.
+ *
+ * @param buf the buffer where to write the string
+ * @param buf_size the size of buf
+ * @param pix_fmt the number of the pixel format to print the
+ * corresponding info string, or a negative value to print the
+ * corresponding header.
+ */
+char *av_get_pix_fmt_string(char *buf, int buf_size,
+                            enum AVPixelFormat pix_fmt);
 
 /**
- * Returns the number of bits per pixel used by the pixel format
- * described by pixdesc.
+ * Return the number of bits per pixel used by the pixel format
+ * described by pixdesc. Note that this is not the same as the number
+ * of bits per sample.
  *
  * The returned number of bits refers to the number of bits actually
  * used for storing the pixel information, that is padding bits are
@@ -225,4 +241,54 @@ enum PixelFormat av_get_pix_fmt(const char *name);
  */
 int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc);
 
+/**
+ * @return a pixel format descriptor for provided pixel format or NULL if
+ * this pixel format is unknown.
+ */
+const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt);
+
+/**
+ * Iterate over all pixel format descriptors known to libavutil.
+ *
+ * @param prev previous descriptor. NULL to get the first descriptor.
+ *
+ * @return next descriptor or NULL after the last descriptor
+ */
+const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev);
+
+/**
+ * @return an AVPixelFormat id described by desc, or AV_PIX_FMT_NONE if desc
+ * is not a valid pointer to a pixel format descriptor.
+ */
+enum AVPixelFormat av_pix_fmt_desc_get_id(const AVPixFmtDescriptor *desc);
+
+/**
+ * Utility function to access log2_chroma_w log2_chroma_h from
+ * the pixel format AVPixFmtDescriptor.
+ *
+ * @param[in]  pix_fmt the pixel format
+ * @param[out] h_shift store log2_chroma_h
+ * @param[out] v_shift store log2_chroma_w
+ *
+ * @return 0 on success, AVERROR(ENOSYS) on invalid or unknown pixel format
+ */
+int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt,
+                                     int *h_shift, int *v_shift);
+
+/**
+ * @return number of planes in pix_fmt, a negative AVERROR if pix_fmt is not a
+ * valid pixel format.
+ */
+int av_pix_fmt_count_planes(enum AVPixelFormat pix_fmt);
+
+/**
+ * Utility function to swap the endianness of a pixel format.
+ *
+ * @param[in]  pix_fmt the pixel format
+ *
+ * @return pixel format with swapped endianness if it exists,
+ * otherwise AV_PIX_FMT_NONE
+ */
+enum AVPixelFormat av_pix_fmt_swap_endianness(enum AVPixelFormat pix_fmt);
+
 #endif /* AVUTIL_PIXDESC_H */