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FFmpeg
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Functions responsible for allocating, freeing, and copying memory. More...
Functions | |
| void * | av_malloc (size_t size) av_malloc_attrib 1(1) |
| Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU). More... | |
| void * | av_mallocz (size_t size) av_malloc_attrib 1(1) |
| Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU) and zero all the bytes of the block. More... | |
| void * | av_malloc_array (size_t nmemb, size_t size) |
| void * | av_calloc (size_t nmemb, size_t size) av_malloc_attrib 1(1 |
| Allocate a memory block for an array with av_mallocz(). More... | |
| void void * | av_realloc (void *ptr, size_t size) 1(2) |
| Allocate, reallocate, or free a block of memory. More... | |
| av_warn_unused_result int | av_reallocp (void *ptr, size_t size) |
| Allocate, reallocate, or free a block of memory through a pointer to a pointer. More... | |
| void * | av_realloc_f (void *ptr, size_t nelem, size_t elsize) |
| Allocate, reallocate, or free a block of memory. More... | |
| void * | av_realloc_array (void *ptr, size_t nmemb, size_t size) |
| int | av_reallocp_array (void *ptr, size_t nmemb, size_t size) |
| Allocate, reallocate an array through a pointer to a pointer. More... | |
| void * | av_fast_realloc (void *ptr, unsigned int *size, size_t min_size) |
| Reallocate the given buffer if it is not large enough, otherwise do nothing. More... | |
| void | av_fast_malloc (void *ptr, unsigned int *size, size_t min_size) |
| Allocate a buffer, reusing the given one if large enough. More... | |
| void | av_fast_mallocz (void *ptr, unsigned int *size, size_t min_size) |
| Allocate and clear a buffer, reusing the given one if large enough. More... | |
| void | av_free (void *ptr) |
| Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family. More... | |
| void | av_freep (void *ptr) |
Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family, and set the pointer pointing to it to NULL. More... | |
| char * | av_strdup (const char *s) av_malloc_attrib |
| Duplicate a string. More... | |
| char * | av_strndup (const char *s, size_t len) av_malloc_attrib |
| Duplicate a substring of a string. More... | |
| void * | av_memdup (const void *p, size_t size) |
| Duplicate a buffer with av_malloc(). More... | |
| void | av_memcpy_backptr (uint8_t *dst, int back, int cnt) |
| Overlapping memcpy() implementation. More... | |
Functions responsible for allocating, freeing, and copying memory.
All memory allocation functions have a built-in upper limit of INT_MAX bytes. This may be changed with av_max_alloc(), although exercise extreme caution when doing so.
| void* av_malloc | ( | size_t | size | ) |
Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU).
| size | Size in bytes for the memory block to be allocated |
NULL if the block cannot be allocated Definition at line 96 of file mem.c.
Referenced by av_malloc(), av_malloc_array(), av_mallocz(), av_memdup(), and fast_malloc().
| void* av_mallocz | ( | size_t | size | ) |
Allocate a memory block with alignment suitable for all memory accesses (including vectors if available on the CPU) and zero all the bytes of the block.
| size | Size in bytes for the memory block to be allocated |
NULL if it cannot be allocated Definition at line 254 of file mem.c.
Referenced by a64multi_encode_init(), aac_encode_init(), add_fragment(), add_param_definition(), add_pes_stream(), add_segment(), add_side_data_from_buf_ext(), adpcm_encode_init(), alac_encode_init(), alloc_buffer(), alloc_data_buf(), alloc_hevc_header_structs(), alloc_plane(), alloc_rbsp_buffer(), allocate_array_elem(), allocate_buffers(), allocate_sample_buffers(), allocate_tables(), ambisonics_config(), amf_encode_init_av1(), amf_encode_init_h264(), amf_encode_init_hevc(), apng_write_header(), aribcaption_init(), aribcaption_trans_bitmap_subtitle(), aribcaption_trans_text_subtitle(), asf_read_stream_properties(), ass_decode_frame(), atrac3_decode_init(), audio_element_obu(), av_aes_alloc(), av_aes_ctr_alloc(), av_ambient_viewing_environment_alloc(), av_audio_fifo_alloc(), av_blowfish_alloc(), av_bsf_alloc(), av_bsf_list_alloc(), av_buffer_create(), av_buffer_pool_init(), av_buffer_pool_init2(), av_buffer_ref(), av_buffersrc_parameters_alloc(), av_calloc(), av_camellia_alloc(), av_cast5_alloc(), av_content_light_metadata_alloc(), av_cpb_properties_alloc(), av_dct_init(), av_des_alloc(), av_detection_bbox_alloc(), av_dict_set(), av_dovi_alloc(), av_dovi_metadata_alloc(), av_dump_format(), av_dynamic_hdr_plus_alloc(), av_dynamic_hdr_vivid_alloc(), av_encryption_info_alloc(), av_encryption_init_info_alloc(), av_executor_alloc(), av_expr_parse(), av_fft_init(), av_fifo_alloc2(), av_film_grain_params_alloc(), av_hash_alloc(), av_hmac_alloc(), av_hwdevice_ctx_alloc(), av_hwdevice_get_hwframe_constraints(), av_hwdevice_hwconfig_alloc(), av_hwframe_ctx_alloc(), av_iamf_audio_element_alloc(), av_iamf_mix_presentation_alloc(), av_iamf_param_definition_alloc(), av_mastering_display_metadata_alloc(), av_md5_alloc(), av_mdct_init(), av_murmur3_alloc(), av_new_program(), av_opt_query_ranges_default(), av_packet_new_side_data(), av_parser_init(), av_rc4_alloc(), av_rdft_init(), av_ripemd_alloc(), av_sha512_alloc(), av_sha_alloc(), av_spherical_alloc(), av_stereo3d_alloc(), av_tea_alloc(), av_thread_message_queue_alloc(), av_tree_node_alloc(), av_twofish_alloc(), av_vdpau_alloc_context(), av_video_enc_params_alloc(), av_video_hint_alloc(), av_vk_frame_alloc(), av_vorbis_parse_init(), av_xtea_alloc(), avcodec_dct_alloc(), avcodec_get_hw_frames_parameters(), avcodec_open2(), avcodec_parameters_alloc(), avcodec_parameters_copy(), avcodec_parameters_from_context(), avcodec_parameters_to_context(), avdevice_list_devices(), avfilter_graph_alloc(), avfilter_graph_queue_command(), avfilter_graph_segment_parse(), avfilter_inout_alloc(), avfilter_link(), avformat_alloc_context(), avformat_alloc_output_context2(), avformat_new_stream(), avformat_open_input(), avformat_stream_group_create(), avi_read_header(), avi_write_header(), avio_open_dir(), avpriv_adts_header_parse(), avpriv_elbg_do(), avpriv_float_dsp_alloc(), avpriv_mpegts_parse_open(), avpriv_new_chapter(), avui_encode_init(), bfi_decode_init(), buffer_create(), callback(), chain_parse(), che_configure(), check_add_bytes(), check_add_gradient_pred(), check_add_int16(), check_add_left_pred(), check_add_median_pred(), check_field_queue(), codec_config_obu(), codec_create(), command(), config_output(), cook_decode_init(), copy_av_subtitle(), copy_chapters(), copy_init_section(), create_vorbis_context(), cuvid_decode_init(), D(), d3d12va_pool_alloc(), dash_init(), dec_alloc(), decklink_autodetect(), decode_dvd_subtitles(), decode_extradata_ps_mp4(), decode_frame(), decode_init(), decode_pic(), decoder_init(), dfa_decode_init(), dhav_read_packet(), display_end_segment(), dnn_detect_parse_anchors(), dnn_detect_parse_yolo_output(), dnn_load_model_tf(), dnn_load_model_th(), dnxhd_init_vlc(), do_encrypt(), doTest(), draw_text(), dshow_get_format_info(), dss_read_metadata_string(), dvbsub_parse_display_definition_segment(), dvbsub_parse_page_segment(), dvbsub_parse_region_segment(), dvdvideo_subdemux_open(), dxva2_device_create(), dxva2_map_frame(), eb_enc_init(), enc_alloc(), enc_open(), encode_frame(), encode_init(), encode_picture_ls(), encode_sample_description(), enqueue_packet(), epic_add_pixel_to_cache(), fast_malloc(), ff_all_channel_counts(), ff_all_channel_layouts(), ff_all_samplerates(), ff_alloc_a53_sei(), ff_alloc_dir_entry(), ff_alloc_input_device_context(), ff_alloc_timecode_sei(), ff_alsa_get_device_list(), ff_ass_add_rect2(), ff_ass_split(), ff_ass_split_dialog(), ff_attach_decode_data(), ff_avc_write_annexb_extradata(), ff_cavs_init_top_lines(), ff_cbs_init(), ff_celt_init(), ff_decklink_list_devices(), ff_decklink_list_devices_legacy(), ff_decklink_read_header(), ff_decklink_write_header(), ff_decode_internal_alloc(), ff_ebur128_init(), ff_encode_internal_alloc(), ff_evc_parse_pps(), ff_evc_parse_sps(), ff_fbdev_get_device_list(), ff_ffv1_init_slice_contexts(), ff_filter_alloc(), ff_formats_pixdesc_filter(), ff_frame_pool_audio_init(), ff_frame_pool_video_init(), ff_frame_thread_encoder_init(), ff_frame_thread_init(), ff_graph_thread_init(), ff_hwframe_map_create(), ff_iamf_add_audio_element(), ff_iamf_add_mix_presentation(), ff_iir_filter_init_coeffs(), ff_iir_filter_init_state(), ff_init_vscale(), ff_intrax8_common_init(), ff_jpegls_decode_picture(), ff_lpc_init(), ff_lzw_decode_open(), ff_make_channel_layout_list(), ff_mediacodec_surface_ref(), ff_mjpeg_decode_sof(), ff_mlz_init_dict(), ff_mpeg_er_init(), ff_mpv_encode_init(), ff_mpv_init_context_frame(), ff_nut_add_sp(), ff_nvdec_decode_init(), ff_nvdec_start_frame(), ff_opus_psy_init(), ff_parse_mpeg2_descriptor(), ff_pca_init(), ff_psy_preprocess_init(), ff_rate_control_init(), ff_rdt_parse_open(), ff_read_riff_info(), ff_rfps_add_frame(), ff_rm_alloc_rmstream(), ff_rtp_parse_open(), ff_rtsp_setup_output_streams(), ff_silk_init(), ff_slice_thread_init(), ff_timefilter_new(), ff_tx_gen_inplace_map(), ff_tx_gen_split_radix_parity_revtab(), ff_tx_init_subtx(), ff_tx_rdft_init(), ff_v4l2_context_init(), ff_v4l2_m2m_create_context(), ff_vaapi_encode_init(), ff_videotoolbox_alloc_frame(), ff_vk_create_avbuf(), ff_vk_create_imageviews(), ff_vk_frame_params(), ff_vk_glslang_init(), ff_vk_shaderc_init(), ff_vk_video_common_init(), ff_vs_init(), ff_wms_parse_sdp_a_line(), ffat_decode(), ffat_init_decoder(), ffat_init_encoder(), ffmal_update_format(), ffmmal_add_packet(), ffmmal_set_ref(), fg_send_command(), filter_frame(), filter_parse(), find_component(), find_headers_search_validate(), flac_read_header(), flashsv2_encode_init(), flashsv_decode_frame(), flush_packet(), flv_parse_video_color_info(), flv_queue_extradata(), frame_alloc(), frame_data_ensure(), g2m_init_buffers(), gen_sub_bitmap(), generate_fake_vps(), generate_joint_tables(), get_content_url(), get_current_encryption_info(), get_current_fragment(), get_Fragment(), get_free_frame(), get_http_header_data(), get_output_ov(), get_private_data(), get_siz(), get_surface(), gif_encode_init(), gxf_write_header(), handle_eac3(), handle_file(), handler(), heif_add_stream(), hevc_init_context(), hls_slice_data_wpp(), hnm_decode_init(), hw_device_add(), hwaccel_init(), iec61883_callback(), init(), init_context_defaults(), init_duplicate_context(), init_fps(), init_model_ov(), init_muxer(), init_thread(), inout_add(), kmsgrab_read_packet(), lavfi_read_header(), libaribb24_decode(), libcodec2_init_encoder(), libkvazaar_init(), librav1e_encode_init(), librav1e_receive_packet(), linklabels_parse(), LLVMFuzzerTestOneInput(), load_tf_model(), magy_encode_init(), main(), make_eval_expr(), make_field_queue(), make_point(), map_alloc(), measure_text(), mediacodec_decode_init(), mediacodec_wrap_hw_buffer(), mediaformat_jni_new(), mediaformat_jni_newFromObject(), mediaformat_ndk_create(), mf_enca_output_type_get(), mf_encv_output_type_get(), mix_presentation_obu(), mmsh_open_internal(), mmsh_read_seek(), mov_init_iamf_track(), mov_read_chapters(), mov_read_covr(), mov_read_dref(), mov_read_iacb(), mov_read_keys(), mov_read_pssh(), mov_read_stsd(), mov_read_tenc(), mov_read_trak(), mov_read_udta_string(), mov_read_uuid(), mov_read_wave(), mov_write_dvc1_structs(), mov_write_single_packet(), mpeg_mux_init(), mpeg_mux_write_packet(), mpegts_add_service(), mpegts_init(), mpegts_open_filter(), mpegts_open_section_filter(), mpegts_write_packet_internal(), mss2_decode_init(), mxf_handle_missing_index_segment(), mxf_init(), mxf_read_ffv1_sub_descriptor(), mxf_read_local_tags(), mxpeg_decode_mxm(), ndk_codec_create(), new_init_section(), new_matrix(), new_playlist(), new_rendition(), new_stream(), new_stream_video(), new_variant(), nsv_parse_NSVf_header(), nsv_parse_NSVs_header(), nvenc_setup_extradata(), objpool_alloc(), ogg_buffer_page(), ogg_build_flac_headers(), ogg_build_opus_headers(), ogg_build_speex_headers(), ogg_build_vp8_headers(), ogg_init(), ogg_save(), ogg_write_vorbiscomment(), omx_component_init(), omx_init(), open_input(), open_virtual_track(), opencl_map_frame(), opencl_pool_alloc(), opus_header(), overlay_qsv_init(), paf_video_init(), param_parse(), parse_cc_stream_mapstring(), parse_fmtp_config(), parse_keyframes_index(), parse_manifest_representation(), parse_manifest_segmenttimeline(), parse_primary(), parse_sws_flags(), parse_variant_stream_mapstring(), parse_vtrk(), pic_arrays_init(), pool_alloc_buffer(), pp_get_context(), prepare_buf(), psy_3gpp_init(), pulse_add_detected_device(), put_audio_specific_config(), put_main_header(), qsv_decode(), qsv_device_create(), qsv_device_derive(), qsv_hevc_set_encode_ctrl(), qsv_stack_init(), qt_rtp_parse_packet(), qtrle_encode_init(), rdt_parse_b64buf(), read_apic(), read_chapter(), read_gab2_sub(), read_geobtag(), read_header(), read_header_vs(), read_huffman_code_normal(), read_packet_vs(), read_priv(), read_vlc_prefix(), reallocAlign(), resample_init(), resolve_content_path(), rkmpp_init_decoder(), rkmpp_retrieve_frame(), rl2_decode_init(), rv34_decoder_alloc(), sap_write_header(), save_subtitle_set(), sch_alloc(), segment_end(), set_encoder_id(), set_extradata(), set_roi_encode_ctrl(), setup_frame(), slices_realloc(), sp5x_decode_frame(), speex_header(), sq_alloc(), stream_open(), strftime_expand(), subtitle_wrap_frame(), svc_encode_init(), svq1_encode_init(), svq1_encode_plane(), svq3_decode_init(), swr_alloc(), swri_rematrix_init(), sws_alloc_context(), tgv_decode_frame(), theora_header(), tl_create(), tm2_build_huff_table(), tq_alloc(), ttml_write_header_content(), update_block_buffers(), update_context_from_thread(), update_dimensions(), update_variant_stream_info(), url_alloc_for_protocol(), url_open_dyn_buf_internal(), utvideo_encode_init(), v4l2_get_device_list(), vaapi_device_create(), vaapi_device_derive(), vaapi_encode_alloc(), vaapi_encode_issue(), var_size_bme(), vc1_decode_frame(), vc1_decode_init(), vc1_decode_init_alloc_tables(), vc2_encode_init(), videostream_cb(), vorbis_header(), vorbis_parse_setup_hdr_codebooks(), vorbis_parse_setup_hdr_floors(), vorbis_parse_setup_hdr_mappings(), vorbis_parse_setup_hdr_modes(), vorbis_parse_setup_hdr_residues(), vorbis_update_metadata(), vp9_raw_reorder_filter(), vqa_decode_init(), vtenc_send_frame(), vulkan_decode_get_profile(), wmv2_encode_init(), wrap_texture_buf(), wrapped_avframe_encode(), write_packet(), write_uncoded_frame_internal(), writer_open(), wtvfile_open_sector(), and wv_alloc_frame_context().
| void* av_calloc | ( | size_t | nmemb, |
| size_t | size | ||
| ) |
Allocate a memory block for an array with av_mallocz().
The allocated memory will have size size * nmemb bytes.
| nmemb | Number of elements |
| size | Size of the single element |
NULL if the block cannot be allocated| void void* av_realloc | ( | void * | ptr, |
| size_t | size | ||
| ) |
Allocate, reallocate, or free a block of memory.
If ptr is NULL and size > 0, allocate a new block. Otherwise, expand or shrink that block of memory according to size.
| ptr | Pointer to a memory block already allocated with av_realloc() or NULL |
| size | Size in bytes of the memory block to be allocated or reallocated |
NULL if the block cannot be reallocatedDefinition at line 153 of file mem.c.
Referenced by add_adaptation_set(), add_file(), append_extradata(), av_bprint_alloc(), av_bprint_finalize(), av_buffer_realloc(), av_dict_set(), av_fast_realloc(), av_packet_add_side_data(), av_realloc_array(), av_realloc_f(), av_reallocp(), av_strdup(), av_strndup(), buf_realloc(), cbs_h2645_assemble_fragment(), decode_header(), epic_hash_add(), ff_cuda_load_module(), ff_els_decode_unsigned(), ff_h264_parse_sprop_parameter_sets(), ff_img_read_header(), ff_load_textfile(), ff_rtmp_packet_create(), ff_vs_init(), fixup_vorbis_headers(), flac_fifo_alloc(), flac_fifo_grow(), get_ppm(), get_ppt(), jpeg2000_decode_packet(), libjxl_encode_frame(), libjxl_encode_init(), main(), match_streams(), mov_fix_index(), parse_adaptation_sets(), probe_codec(), qt_rtp_parse_packet(), and xmlescape().
| av_warn_unused_result int av_reallocp | ( | void * | ptr, |
| size_t | size | ||
| ) |
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
If *ptr is NULL and size > 0, allocate a new block. If size is zero, free the memory block pointed to by *ptr. Otherwise, expand or shrink that block of memory according to size.
| [in,out] | ptr | Pointer to a pointer to a memory block already allocated with av_realloc(), or a pointer to NULL. The pointer is updated on success, or freed on failure. |
| [in] | size | Size in bytes for the memory block to be allocated or reallocated |
Definition at line 186 of file mem.c.
Referenced by aom_init(), append_flv_data(), asfrtp_parse_packet(), auxiliary_info_alloc_size(), av_probe_input_buffer2(), av_vdpau_bind_context(), avi_read_header(), bmv_read_packet(), cbs_h2645_assemble_fragment(), cbs_write_unit_data(), concatenate_packet(), decode_frame(), dxv_decode(), dyn_buf_write(), ff_els_decode_unsigned(), ff_lzf_uncompress(), ff_opencl_filter_load_program_from_file(), fixup_vorbis_headers(), flashsv_decode_frame(), g2m_load_cursor(), get_tcp_server_response(), h264_extradata_to_annexb(), handle_metadata(), hap_decode(), hevc_extradata_to_annexb(), http_open(), jpg_decode_data(), mediacodec_receive(), mov_cenc_end_packet(), mov_realloc_extradata(), omx_encode_frame(), omx_encode_init(), opt_get_array(), parse_icy(), qt_rtp_parse_packet(), rdt_parse_sdp_line(), realloc_buffer(), rtmp_http_write(), rtmp_open(), rtmp_write(), set_segment_filename(), tdsc_decode_frame(), tdsc_decode_tiles(), tdsc_init(), tdsc_load_cursor(), tgv_decode_inter(), theora_header(), tls_client_handshake_loop(), tls_read(), vpx_init(), and vvc_extradata_to_annexb().
| void* av_realloc_f | ( | void * | ptr, |
| size_t | nelem, | ||
| size_t | elsize | ||
| ) |
Allocate, reallocate, or free a block of memory.
This function does the same thing as av_realloc(), except:
nelem * elsize bytes, after checking the result of the multiplication for integer overflow.Definition at line 171 of file mem.c.
Referenced by av_reallocp_array().
| void* av_realloc_array | ( | void * | ptr, |
| size_t | nmemb, | ||
| size_t | size | ||
| ) |
Definition at line 215 of file mem.c.
Referenced by add_param_definition(), add_serial_pair(), add_side_data_from_buf_ext(), append_pad(), aribcaption_init(), audio_element_obu(), av_dict_set(), av_fifo_alloc2(), av_fifo_grow2(), av_frame_replace(), av_program_add_stream_index(), avfilter_graph_alloc_filter(), avformat_new_stream(), avformat_stream_group_create(), codec_config_obu(), decode_styl(), decode_unregistered_user_data(), ff_alsa_extend_reorder_buf(), ff_ass_add_rect2(), ff_cbs_sei_list_add(), ff_encode_add_cpb_side_data(), ff_framequeue_add(), ff_iamf_add_audio_element(), ff_iamf_add_mix_presentation(), ff_mov_write_packet(), ff_rtmp_check_alloc_array(), ff_vaapi_decode_make_slice_buffer(), ff_vk_add_push_constant(), ff_vk_pipeline_descriptor_set_add(), fill_codec_config(), fill_marker_resource(), filter_frame(), frame_hash(), get_preset_file(), grow_array(), handle_file(), handler(), jpeg2000_decode_packet(), log_callback(), mix_presentation_obu(), mkv_add_cuepoint(), mov_read_iinf(), mov_read_iloc(), mov_read_iref_dimg(), mxf_read_partition_pack(), new_stream_video(), ogg_new_stream(), open_virtual_track(), opt_set_array(), packet_side_data_add(), param_parse(), parse_imf_asset_map_from_xml_dom(), push_main_audio_sequence(), push_marker_sequence(), rd_get(), realloc_section_array(), sample_queue_push(), slices_realloc(), sq_add_stream(), stream_group_add_stream(), tee_open(), update_block_dimensions(), update_frag_index(), vaapi_av1_decode_slice(), vaapi_encode_make_packed_header(), vaapi_encode_make_param_buffer(), wv_alloc_frame_context(), and xan_decode_frame().
| int av_reallocp_array | ( | void * | ptr, |
| size_t | nmemb, | ||
| size_t | size | ||
| ) |
Allocate, reallocate an array through a pointer to a pointer.
If *ptr is NULL and nmemb > 0, allocate a new block.
| [in,out] | ptr | Pointer to a pointer to a memory block already allocated with av_realloc(), or a pointer to NULL. The pointer is updated on success, or freed on failure. |
| [in] | nmemb | Number of elements |
| [in] | size | Size of the single element |
Definition at line 223 of file mem.c.
Referenced by add_fragment(), add_program(), add_segment(), add_tracked_method(), allocate_buffers(), ass_split_section(), evcc_array_add_nal_unit(), ff_h2645_extract_rbsp(), ff_h2645_sei_ctx_replace(), ff_hap_set_chunk_count(), gem_decode_frame(), gxf_write_map_packet(), gxf_write_packet(), hvcc_array_add_nal_unit(), hw_device_add(), init_tile_data(), mov_add_tfra_entries(), mov_build_index(), mov_read_trex(), mxf_write_packet(), mxf_write_partition(), nut_write_packet(), ogg_restore(), opencl_frames_get_constraints(), parse_adaptation_sets(), parse_strk(), tgv_decode_inter(), tm2_read_stream(), update_index(), vp56_size_changed(), and vvcc_array_add_nal_unit().
| void* av_fast_realloc | ( | void * | ptr, |
| unsigned int * | size, | ||
| size_t | min_size | ||
| ) |
Reallocate the given buffer if it is not large enough, otherwise do nothing.
If the given buffer is NULL, then a new uninitialized buffer is allocated.
If the given buffer is not large enough, and reallocation fails, NULL is returned and *size is set to 0, but the original buffer is not changed or freed.
A typical use pattern follows:
| [in,out] | ptr | Already allocated buffer, or NULL |
| [in,out] | size | Pointer to the size of buffer ptr. *size is updated to the new allocated size, in particular 0 in case of failure. |
| [in] | min_size | Desired minimal size of buffer ptr |
ptr if the buffer is large enough, a pointer to newly reallocated buffer if the buffer was not large enough, or NULL in case of error Definition at line 495 of file mem.c.
Referenced by add_ctts_entry(), add_index_entry(), avc_parse_nal_units(), caf_write_packet(), config_output(), decode_frame(), dirac_combine_frame(), draw_items(), dxva2_av1_decode_slice(), evc_frame_merge_filter(), ff_add_index_entry(), ff_af_queue_add(), ff_av1_packet_split(), ff_combine_frame(), ff_h2645_packet_split(), ff_mms_asf_header_parser(), ff_nvdec_simple_decode_slice(), ff_range_add(), ff_subtitles_queue_insert(), ff_tx_init_subtx(), ff_vdpau_add_buffer(), ff_videotoolbox_buffer_copy(), ff_vk_decode_add_slice(), ff_vk_exec_add_dep_buf(), filter_frame(), flac_fifo_read_wrap(), get_stats(), h264_extradata_to_annexb(), h264_mp4toannexb_save_ps(), init(), intercept_id3(), libx265_encode_frame(), mov_build_index(), mov_parse_auxiliary_info(), mov_read_ctts(), mov_read_pssh(), mov_read_saio(), mov_read_senc(), mov_read_stts(), mov_read_trun(), mov_text_style_start(), mxg_update_cache(), nvdec_av1_decode_slice(), nvdec_h264_decode_slice(), nvdec_hevc_decode_slice(), open_track_file_resource(), parse_string(), prepare_sei_data_array(), push_main_audio_sequence(), push_main_image_2d_sequence(), queue_frames(), read_frame(), setup_frame(), shorten_decode_frame(), spdif_header_eac3(), update_frag_index(), and vc1_decode_frame().
| void av_fast_malloc | ( | void * | ptr, |
| unsigned int * | size, | ||
| size_t | min_size | ||
| ) |
Allocate a buffer, reusing the given one if large enough.
Contrary to av_fast_realloc(), the current buffer contents might not be preserved and on error the old buffer is freed, thus no special handling to avoid memleaks is necessary.
*ptr is allowed to be NULL, in which case allocation always happens if size_needed is greater than 0.
| [in,out] | ptr | Pointer to pointer to an already allocated buffer. *ptr will be overwritten with pointer to new buffer on success or NULL on failure |
| [in,out] | size | Pointer to the size of buffer *ptr. *size is updated to the new allocated size, in particular 0 in case of failure. |
| [in] | min_size | Desired minimal size of buffer *ptr |
Definition at line 555 of file mem.c.
Referenced by alloc_scratch_buffers(), allocate_buffers(), ape_decode_frame(), audio_decode_frame(), av_fast_padded_mallocz(), chs_alloc_lsb_band_data(), chs_alloc_msb_band_data(), chs_assemble_freq_bands(), codec_reinit(), crypto_write(), decode_8(), decode_frame(), detect_clips(), do_interpolation(), ff_dca_core_filter_fixed(), fic_decode_frame(), filter_frame_float(), find_motion(), gif_decode_frame(), gif_read_image(), id3v2_parse(), interpolation(), ljpeg_decode_rgb_scan(), magy_decode_frame(), opus_decode_subpacket(), parse_navi_table(), parse_utf(), pmp_packet(), rscc_decode_frame(), scale_internal(), spdif_header_dts4(), spdif_write_packet(), tak_decode_frame(), truemotion1_decode_header(), truemotion1_decode_init(), update_block_dimensions(), update_init_section(), update_md5_sum(), and verify_md5().
| void av_fast_mallocz | ( | void * | ptr, |
| unsigned int * | size, | ||
| size_t | min_size | ||
| ) |
Allocate and clear a buffer, reusing the given one if large enough.
Like av_fast_malloc(), but all newly allocated space is initially cleared. Reused buffer is not cleared.
*ptr is allowed to be NULL, in which case allocation always happens if size_needed is greater than 0.
| [in,out] | ptr | Pointer to pointer to an already allocated buffer. *ptr will be overwritten with pointer to new buffer on success or NULL on failure |
| [in,out] | size | Pointer to the size of buffer *ptr. *size is updated to the new allocated size, in particular 0 in case of failure. |
| [in] | min_size | Desired minimal size of buffer *ptr |
Definition at line 560 of file mem.c.
Referenced by alloc_sample_buffer(), alloc_scratch_buffers(), alloc_x96_sample_buffer(), av_fast_padded_malloc(), decode_frame(), and g2m_init_buffers().
| void av_free | ( | void * | ptr | ) |
Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family.
| ptr | Pointer to the memory block which should be freed. |
ptr = NULL is explicitly allowed. Definition at line 236 of file mem.c.
Referenced by av_freep(), and av_realloc_f().
| void av_freep | ( | void * | ptr | ) |
Free a memory block which has been allocated with a function of av_malloc() or av_realloc() family, and set the pointer pointing to it to NULL.
| ptr | Pointer to the pointer to the memory block which should be freed |
*ptr = NULL is safe and leads to no action. Definition at line 245 of file mem.c.
Referenced by av_dynarray2_add(), av_dynarray_add(), av_reallocp(), and fast_malloc().
| char* av_strdup | ( | const char * | s | ) |
Duplicate a string.
| s | String to be duplicated |
s or NULL if the string cannot be allocated Definition at line 270 of file mem.c.
Referenced by add_tracked_method(), aribcaption_trans_text_subtitle(), ass_decode_frame(), av_append_path_component(), av_channel_layout_from_string(), av_dict_get_string(), av_dict_set(), av_opt_get(), avfilter_graph_parse(), avfilter_graph_queue_command(), avfilter_graph_segment_create_filters(), avformat_alloc_output_context2(), avformat_open_input(), avpriv_tempfile(), caca_write_header(), check_extensions(), check_validation_layers(), cine_read_header(), config_eq_output(), config_input(), config_output(), config_params(), configure_filtergraph(), configure_video_filters(), copy_av_subtitle(), curves_init(), dash_init(), dec_filter_add(), dec_open(), delimited_dict_parse(), describe_filter_link(), draw_curves(), enc_stats_get_file(), ff_alsa_get_device_list(), ff_boxblur_eval_filter_params(), ff_copy_whiteblacklists(), ff_decklink_list_devices(), ff_fbdev_get_device_list(), ff_filter_alloc(), ff_http_do_new_request2(), ff_http_match_no_proxy(), ff_img_read_header(), ff_jni_jstring_to_utf_chars(), ff_mediacodec_dec_init(), ff_mkdir_p(), ff_tls_open_underlying(), ffio_fdopen(), ffurl_connect(), fg_send_command(), filter_parse(), format_name(), ftp_connect(), ftp_current_dir(), ftp_parse_entry_mlsd(), ftp_parse_entry_nlst(), geq_init(), get_cookies(), get_current_fragment(), get_opt_flags_string(), getenv_dup(), grab_read_header(), hls_delete_old_segments(), hls_init(), hls_mux_init(), hls_read_header(), hls_rename_temp_file(), hls_start(), hls_write_packet(), hls_write_trailer(), http_open(), http_open_cnx(), http_seek_internal(), icecast_open(), imf_read_header(), init(), init_filter(), init_filters(), init_muxer(), initialize(), inout_add(), ist_add(), ist_filter_add(), label_string(), lavfi_read_header(), libsmbc_read_dir(), libssh_read_dir(), log_callback(), main(), match_stream_specifier(), measure_text(), mediacodec_ndk_getName(), mediaformat_ndk_getString(), mediaformat_ndk_toString(), mkv_write_simpletag(), mmsh_open_internal(), mpjpeg_read_packet(), mtv_read_header(), new_init_section(), new_stream_audio(), new_stream_video(), noise_init(), nppscale_parse_expr(), of_add_attachments(), of_add_groups(), of_parse_iamf_submixes(), open_camera(), open_input_file(), open_output_file(), open_slave(), opengl_write_header(), opt_add_vfilter(), opt_attach(), opt_codec(), opt_copy_elem(), opt_filter_complex(), opt_filter_threads(), opt_get_elem(), opt_input_file(), opt_map(), opt_output_file_o(), opt_print_filename(), opt_vstats_file(), ost_get_filters(), param_init(), parse_assetmap(), parse_cc_stream_mapstring(), parse_channel_expressions(), parse_device_name(), parse_fmtp(), parse_imf_asset_map_from_xml_dom(), parse_location(), parse_manifest(), parse_manifest_representation(), parse_options(), parse_playlist(), parse_psfile(), parse_read_interval(), parse_read_intervals(), parse_set_cookie(), parse_speaker_pos(), parse_times(), parse_variant_stream_mapstring(), parse_video_var(), plot_freqs(), process_command(), process_line(), pulse_add_detected_device(), pulse_server_info_cb(), qsv_decode_init(), qsv_enc_init(), read_channels(), read_classify_label_file(), read_custom_noise(), read_detect_label_file(), read_gains(), read_header(), read_tf_coefficients(), read_ttag(), read_zp_coefficients(), realtext_read_header(), rfc4175_parse_fmtp(), rtmp_http_open(), rtp_open(), sami_paragraph_to_ass(), sap_read_header(), sap_write_header(), scale_parse_expr(), sch_sdp_filename(), sdl2_write_header(), segment_end(), set_ass_header(), set_enable_expr(), set_expr(), set_options(), set_segment_filename(), set_string(), show_help(), sls_flags_filename_process(), stream_open(), tcp_open(), tiff_decode_tag(), udp_open(), update_master_pl_info(), v4l2_get_device_list(), validate_name(), write_option(), xcbgrab_read_header(), and xv_write_header().
| char* av_strndup | ( | const char * | s, |
| size_t | len | ||
| ) |
Duplicate a substring of a string.
| s | String to be duplicated |
| len | Maximum length of the resulting string (not counting the terminating byte) |
s or NULL if the string cannot be allocated Definition at line 282 of file mem.c.
Referenced by hw_device_init_from_string(), match_stream_specifier(), mpjpeg_get_boundary(), parse_adaptation_sets(), parse_cookie(), and process_line().
| void* av_memdup | ( | const void * | p, |
| size_t | size | ||
| ) |
Duplicate a buffer with av_malloc().
| p | Buffer to be duplicated |
| size | Size in bytes of the buffer copied |
p or NULL if the buffer cannot be allocated Definition at line 302 of file mem.c.
Referenced by aribcaption_trans_bitmap_subtitle(), av_bprint_finalize(), av_frame_replace(), avformat_find_stream_info(), codec_parameters_copy_side_data(), compute_chapters_end(), copy_av_subtitle(), dnxhd_encode_init(), dvbsub_parse_clut_segment(), ff_filter_alloc(), ff_get_format(), ff_iamf_write_audio_frame(), ff_mpv_init_duplicate_contexts(), fill_codec_config(), g723_1_encode_frame(), init_thread(), libx265_encode_frame(), LLVMFuzzerTestOneInput(), mpegts_set_stream_info(), opt_copy_elem(), parse_header(), prepare_sei_data_array(), process_frame(), save_subtitle_set(), set_aes_arg(), setup_frame(), subtitle_wrap_frame(), and vorbis_header().
Overlapping memcpy() implementation.
| dst | Destination buffer |
| back | Number of bytes back to start copying (i.e. the initial size of the overlapping window); must be > 0 |
| cnt | Number of bytes to copy; must be >= 0 |
cnt > back is valid, this will copy the bytes we just copied, thus creating a repeating pattern with a period length of back. Definition at line 445 of file mem.c.
Referenced by color_frame(), copy_backptr(), decode_dsw1(), decode_frame(), decode_tsw1(), ff_lzf_uncompress(), fill_frame(), generate_missing_ref(), memset_bytes(), mszh_decomp(), picmemset(), qsv_fill_border(), qsvenc_fill_padding_area(), residual_interp(), synth_block_fcb_acb(), unpack(), and xan_unpack().
1.8.17