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6dbaf8b913
In design of ALSA pcm core, 'struct snd_pcm_ops.copy' is expected to copy PCM frames, according to frame alignment on intermediate buffer for userspace and dedicated buffer for data transmission. In this callback, value of 'channel' argument depends on the frame alignment, which drivers registers to runtime of PCM substream. When target devices can handle non-interleaved buffer, this value has positive value, otherwise negative. ALSA driver for PCM component of EMU8000 chip is programmed with local macro to switch the frame alignment. The 'copy' operation in non-interleaved side has evaluation of the 'channel' argument (actually it's 'voice' argument). This is useless. This commit remove the evaluation. [tiwai: the negative channel argument was the inheritance from the old code where -1 was meant for interleaved mode. The mix-up was dropped meanwhile, thus it's correct to assume that we receive no longer -1 there, and it's safe to cleanup the relevant code. Also, voice=0 for channel==1 is trivial, and it can be dropped, too.] Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.