FFmpeg: doc/mips.txt File Reference

FFmpeg

Variables
MIPS optimizations	info

Variable Documentation

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MIPS optimizations info

Initial value:

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MIPS optimizations of codecs are targeting MIPS 74k family of
CPUs. Some of these optimizations are relying more on properties of
this architecture and some are relying less (and can be used on most
MIPS architectures without degradation in performance).
 
Along with FFMPEG copyright notice

Definition at line 2 of file mips.txt.

Referenced by aac_encode_init(), aax_read_header(), analyze_mono(), analyze_stereo(), av_encryption_info_add_side_data(), av_encryption_info_alloc(), av_encryption_info_clone(), av_encryption_info_free(), av_encryption_info_get_side_data(), av_encryption_init_info_add_side_data(), av_encryption_init_info_alloc(), av_encryption_init_info_free(), av_encryption_init_info_get_side_data(), av_find_info_tag(), av_get_sample_fmt_string(), bluray_open(), calculate_mode_score(), create_init_info(), create_new_audio_stream(), decode_v1_vector(), decode_v4_vector(), decorr_stereo_buffer(), delta_mono(), delta_stereo(), dshow_cycle_pins(), dshow_get_device_media_types(), dump_video_mjpeg_param(), dump_video_param(), dump_video_vp9_param(), encode_mode(), ff_AMediaCodec_dequeueOutputBuffer(), ff_AMediaCodecList_getCodecNameByType(), ff_dshow_filter_JoinFilterGraph(), ff_dshow_filter_QueryFilterInfo(), ff_dshow_filter_QueryVendorInfo(), ff_dshow_pin_QueryPinInfo(), ff_hls_senc_parse_audio_setup_info(), ff_hls_senc_read_audio_setup_info(), ff_mediacodec_dec_receive(), ff_mediacodec_sw_buffer_copy_yuv420_packed_semi_planar(), ff_mediacodec_sw_buffer_copy_yuv420_planar(), ff_mediacodec_sw_buffer_copy_yuv420_semi_planar(), ff_rfps_add_frame(), ff_rtp_send_h263_rfc2190(), ff_vdpau_common_init(), frame_list_add_frame(), frame_list_clear(), frame_list_remove_samples(), get_stream_info(), handle_eac3(), handle_init_section_args(), handle_key_args(), handle_rendition_args(), handle_variant_args(), libjxl_encode_frame(), load_metadata(), mediacodec_jni_dequeueOutputBuffer(), mediacodec_ndk_dequeueOutputBuffer(), mediacodec_wrap_hw_buffer(), mediacodec_wrap_sw_buffer(), mov_add_tfra_entries(), mov_free(), mov_read_pssh(), mov_write_ac3_tag(), mov_write_eac3_tag(), mov_write_traf_tag(), new_init_section(), new_rendition(), new_variant(), paint_mouse_pointer(), parse_playlist(), pulse_add_detected_device(), pulse_server_info_cb(), put_ics_info(), quantize(), rd_strip(), read_header_vs(), read_packet_vs(), recurse_mono(), recurse_stereo(), run_encryption_info_test(), run_encryption_init_info_test(), sctp_read(), sctp_write(), send_mode_a(), send_mode_b(), set_async_error(), set_param(), set_params(), sort_mono(), sort_stereo(), svc_decode_frame(), vaapi_device_create(), vdpau_av1_decode_slice(), vdpau_av1_start_frame(), vdpau_h264_set_reference_frames(), vdpau_h264_start_frame(), vdpau_hevc_start_frame(), vdpau_mpeg4_start_frame(), vdpau_mpeg_start_frame(), vdpau_vc1_start_frame(), vdpau_vp9_start_frame(), vtenc_q_pop(), and vtenc_q_push().

it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it be(in the first position) for now. Options ------- Then comes the options array. This is what will define the user accessible options. For example

static struct codec_string codecs[]

Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that some(invalid) inputs can trigger overflows(undefined behavior). In these cases

s EdgeDetect Foobar g libavfilter vf_edgedetect c libavfilter vf_foobar c edit libavfilter and add an entry for foobar following the pattern of the other filters edit libavfilter allfilters and add an entry for foobar following the pattern of the other filters configure make j< whatever > ffmpeg ffmpeg i you should get a foobar png with Lena edge detected That s your new playground is ready Some little details about what s going on

Definition: writing_filters.txt:34

static int less(MetadataContext *s, const char *value1, const char *value2)

Definition: f_metadata.c:154