FFmpeg
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Functions for working with pixel formats. More...
Functions | |
void | avcodec_get_chroma_sub_sample (enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift) |
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor. More... | |
unsigned int | avcodec_pix_fmt_to_codec_tag (enum AVPixelFormat pix_fmt) |
Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found. More... | |
int | avcodec_get_pix_fmt_loss (enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha) |
enum AVPixelFormat | avcodec_find_best_pix_fmt_of_list (const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr) |
Find the best pixel format to convert to given a certain source pixel format. More... | |
enum AVPixelFormat | avcodec_find_best_pix_fmt_of_2 (enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr) |
attribute_deprecated enum AVPixelFormat | avcodec_find_best_pix_fmt2 (enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr) |
enum AVPixelFormat | avcodec_default_get_format (struct AVCodecContext *s, const enum AVPixelFormat *fmt) |
Functions for working with pixel formats.
void avcodec_get_chroma_sub_sample | ( | enum AVPixelFormat | pix_fmt, |
int * | h_shift, | ||
int * | v_shift | ||
) |
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.
This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample for one that returns a failure code and continues in case of invalid pix_fmts.
[in] | pix_fmt | the pixel format |
[out] | h_shift | store log2_chroma_w |
[out] | v_shift | store log2_chroma_h |
Definition at line 43 of file imgconvert.c.
Referenced by dirac_decode_data_unit(), encode_init(), ff_mjpeg_decode_frame(), ff_mpv_common_init(), ff_print_debug_info2(), get_buffer_with_edge(), j2kenc_init(), parse_source_parameters(), and vp3_decode_init().
unsigned int avcodec_pix_fmt_to_codec_tag | ( | enum AVPixelFormat | pix_fmt | ) |
Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found.
Definition at line 232 of file raw.c.
Referenced by avformat_find_stream_info(), raw_encode_init(), and v4l2_read_header().
int avcodec_get_pix_fmt_loss | ( | enum AVPixelFormat | dst_pix_fmt, |
enum AVPixelFormat | src_pix_fmt, | ||
int | has_alpha | ||
) |
Definition at line 51 of file imgconvert.c.
enum AVPixelFormat avcodec_find_best_pix_fmt_of_list | ( | const enum AVPixelFormat * | pix_fmt_list, |
enum AVPixelFormat | src_pix_fmt, | ||
int | has_alpha, | ||
int * | loss_ptr | ||
) |
Find the best pixel format to convert to given a certain source pixel format.
When converting from one pixel format to another, information loss may occur. For example, when converting from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of the given pixel formats should be used to suffer the least amount of loss. The pixel formats from which it chooses one, are determined by the pix_fmt_list parameter.
[in] | pix_fmt_list | AV_PIX_FMT_NONE terminated array of pixel formats to choose from |
[in] | src_pix_fmt | source pixel format |
[in] | has_alpha | Whether the source pixel format alpha channel is used. |
[out] | loss_ptr | Combination of flags informing you what kind of losses will occur. |
Definition at line 78 of file imgconvert.c.
enum AVPixelFormat avcodec_find_best_pix_fmt_of_2 | ( | enum AVPixelFormat | dst_pix_fmt1, |
enum AVPixelFormat | dst_pix_fmt2, | ||
enum AVPixelFormat | src_pix_fmt, | ||
int | has_alpha, | ||
int * | loss_ptr | ||
) |
Definition at line 58 of file imgconvert.c.
Referenced by avcodec_find_best_pix_fmt2(), avcodec_find_best_pix_fmt_of_list(), and choose_pixel_fmt().
attribute_deprecated enum AVPixelFormat avcodec_find_best_pix_fmt2 | ( | enum AVPixelFormat | dst_pix_fmt1, |
enum AVPixelFormat | dst_pix_fmt2, | ||
enum AVPixelFormat | src_pix_fmt, | ||
int | has_alpha, | ||
int * | loss_ptr | ||
) |
Definition at line 71 of file imgconvert.c.
enum AVPixelFormat avcodec_default_get_format | ( | struct AVCodecContext * | s, |
const enum AVPixelFormat * | fmt | ||
) |
Definition at line 1146 of file utils.c.
Referenced by avcodec_get_context_defaults3(), ff_thread_get_format(), and submit_packet().