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A modern Music Player Daemon based on Rockbox open source high quality audio player
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mpris
rockbox
mpd
rockboy: rename pcm_*() functions to avoid namespace clash with rockbox
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26327 a1c6a512-1295-4272-9138-f99709370657
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apps/plugins/rockboy/HACKING
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apps/plugins/rockboy/HACKING
···
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each frame.
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The main sound module interfaces with the system-specific code through
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one structure, pcm, and a few functions: pcm_init, pcm_close, and
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pcm_submit. While the first two should be obvious, pcm_submit needs
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one structure, pcm, and a few functions: rockboy_pcm_init, rockboy_pcm_close, and
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rockboy_pcm_submit. While the first two should be obvious, rockboy_pcm_submit needs
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some explaining. Whenever realtime sound output is operational,
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pcm_submit is responsible for timing, and should not return until it
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rockboy_pcm_submit is responsible for timing, and should not return until it
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has successfully processed all the data in its input buffer (pcm.buf).
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On *nix sound devices, this typically means just waiting for the write
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syscall to return, but on systems such as DOS where low level IO must
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be handled in the program, pcm_submit needs to delay until the current
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be handled in the program, rockboy_pcm_submit needs to delay until the current
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position in the DMA buffer has advanced sufficiently to make space for
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the new samples, then copy them.
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For special sound output implementations like write-to-file or the
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dummy sound device, pcm_submit should write the data immediately and
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dummy sound device, rockboy_pcm_submit should write the data immediately and
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return 0, indicating to the caller that other methods must be used for
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timing. On real sound devices that are presently functional,
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pcm_submit should return 1, regardless of whether it buffered or
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rockboy_pcm_submit should return 1, regardless of whether it buffered or
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actually wrote the sound data.
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And yes, for unices without OSS, we hope to add piped audio output
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apps/plugins/rockboy/emu.c
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apps/plugins/rockboy/emu.c
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apps/plugins/rockboy/pcm.h
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apps/plugins/rockboy/pcm.h
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apps/plugins/rockboy/rbsound.c
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apps/plugins/rockboy/rbsound.c
···
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doneplay=1;
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}
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-
void pcm_init(void)
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void rockboy_pcm_init(void)
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{
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if(plugbuf)
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return;
···
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rb->pcm_set_frequency(pcm.hz); /* 44100 22050 11025 */
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}
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void pcm_close(void)
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void rockboy_pcm_close(void)
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{
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memset(&pcm, 0, sizeof pcm);
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newly_started = true;
···
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rb->pcm_set_frequency(HW_SAMPR_DEFAULT);
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}
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int pcm_submit(void)
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int rockboy_pcm_submit(void)
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{
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if (!pcm.buf) return 0;
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if (pcm.pos < pcm.len) return 1;
···
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#else
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void pcm_init(void)
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void rockboy_pcm_init(void)
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{
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pcm.hz = 44100;
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pcm.stereo = 1;
···
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pcm.pos = 0;
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}
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void pcm_close(void)
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void rockboy_pcm_close(void)
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{
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memset(&pcm, 0, sizeof pcm);
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}
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-
int pcm_submit(void)
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+
int rockboy_pcm_submit(void)
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{
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pcm.pos =0;
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return 0;
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apps/plugins/rockboy/rockboy.c
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apps/plugins/rockboy/rockboy.c
···
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rb->lcd_puts(0,0,"Init video");
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vid_init();
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rb->lcd_puts(0,1,"Init sound");
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pcm_init();
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rockboy_pcm_init();
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rb->lcd_puts(0,2,"Loading rom");
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loader_init(rom);
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if(shut)
···
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return PLUGIN_ERROR;
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}
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if(!rb->audio_status())
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pcm_close();
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rockboy_pcm_close();
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rb->splash(HZ/2, "Closing Rockboy");
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