ffmpeg 继续学习 -- ARM优化-- AArch64
2016-06-15 11:34
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1、FFmpeg发布3.0系列
最近ffmpeg的版本更新加快,目前出现 3.0.2 release版本。名称是“爱因斯坦”
FFmpeg 3.0.2 "Einstein"
3.0.2 was released on 2016-04-28. It is the latest stable FFmpeg release from the 3.0 release branch, which was cut from master on 2016-02-14.It includes the following library versions:
2、tools下面有个调整moov atom次序的工具
* This utility rearranges a Quicktime file such that the moov atom* is in front of the data, thus facilitating network streaming.
3、libavcodec下有个aarch64的文件夹
h264dsp_init_aarch64.c文件中定义基于ARM 64位架构指令集的汇编优化加速目前没有看到HEVC的加速代码
av_cold void ff_h264dsp_init_aarch64(H264DSPContext *c, const int bit_depth, const int chroma_format_idc) { int cpu_flags = av_get_cpu_flags(); if (have_neon(cpu_flags) && bit_depth == 8) { c->h264_v_loop_filter_luma = ff_h264_v_loop_filter_luma_neon; c->h264_h_loop_filter_luma = ff_h264_h_loop_filter_luma_neon; c->h264_v_loop_filter_chroma = ff_h264_v_loop_filter_chroma_neon; if (chroma_format_idc <= 1) c->h264_h_loop_filter_chroma = ff_h264_h_loop_filter_chroma_neon; c->weight_h264_pixels_tab[0] = ff_weight_h264_pixels_16_neon; c->weight_h264_pixels_tab[1] = ff_weight_h264_pixels_8_neon; c->weight_h264_pixels_tab[2] = ff_weight_h264_pixels_4_neon; c->biweight_h264_pixels_tab[0] = ff_biweight_h264_pixels_16_neon; c->biweight_h264_pixels_tab[1] = ff_biweight_h264_pixels_8_neon; c->biweight_h264_pixels_tab[2] = ff_biweight_h264_pixels_4_neon; c->h264_idct_add = ff_h264_idct_add_neon; c->h264_idct_dc_add = ff_h264_idct_dc_add_neon; c->h264_idct_add16 = ff_h264_idct_add16_neon; c->h264_idct_add16intra = ff_h264_idct_add16intra_neon; if (chroma_format_idc <= 1) c->h264_idct_add8 = ff_h264_idct_add8_neon; c->h264_idct8_add = ff_h264_idct8_add_neon; c->h264_idct8_dc_add = ff_h264_idct8_dc_add_neon; c->h264_idct8_add4 = ff_h264_idct8_add4_neon; } }
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