333 lines
8.2 KiB
C
333 lines
8.2 KiB
C
/*
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* This file is part of vban_receptor.
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* Copyright (c) 2015 by Benoît Quiniou <quiniouben@yahoo.fr>
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*
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* vban_receptor is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* vban_receptor is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with vban_receptor. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "audio.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define AUDIO_DEVICE "default"
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struct audio_t
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{
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snd_pcm_t* alsa_handle;
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enum VBanBitResolution bitResolution;
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unsigned int nbChannels;
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unsigned int rate;
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size_t buffer_size;
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};
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static int audio_is_format_supported(audio_handle_t handle, enum VBanBitResolution bit_resolution, unsigned int nb_channels, unsigned int rate);
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static int audio_open(audio_handle_t handle, enum VBanBitResolution bit_resolution, unsigned int nb_channels, unsigned int rate);
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static int audio_close(audio_handle_t handle);
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static int audio_write(audio_handle_t handle, char const* data, size_t size);
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static size_t computeSize(unsigned char quality);
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static snd_pcm_format_t vban_to_alsa_format(enum VBanBitResolution bit_resolution)
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{
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switch (bit_resolution)
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{
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case VBAN_BITFMT_8_INT:
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return SND_PCM_FORMAT_S8;
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case VBAN_BITFMT_16_INT:
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return SND_PCM_FORMAT_S16;
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case VBAN_BITFMT_24_INT:
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return SND_PCM_FORMAT_S24;
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case VBAN_BITFMT_32_INT:
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return SND_PCM_FORMAT_S32;
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case VBAN_BITFMT_32_FLOAT:
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return SND_PCM_FORMAT_FLOAT;
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case VBAN_BITFMT_64_FLOAT:
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return SND_PCM_FORMAT_FLOAT64;
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default:
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return SND_PCM_FORMAT_UNKNOWN;
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}
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}
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size_t computeSize(unsigned char quality)
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{
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size_t const nmin = VBAN_PROTOCOL_MAX_SIZE;
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size_t nnn = 0;
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switch(quality)
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{
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case 0:
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nnn = 512;
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break;
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case 1:
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nnn = 1024;
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break;
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case 2:
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nnn = 2048;
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break;
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case 3:
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nnn = 4096;
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break;
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case 4:
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nnn = 8192;
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break;
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default:
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break;
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}
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nnn=nnn*3;
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if (nnn < nmin)
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{
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nnn = nmin;
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}
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return nnn;
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}
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int audio_init(audio_handle_t* handle, unsigned char quality)
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{
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if (handle == 0)
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{
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printf("audio_init: null handle pointer\n");
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return -EINVAL;
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}
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*handle = (struct audio_t*)malloc(sizeof(struct audio_t));
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if (*handle == 0)
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{
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printf("audio_init: could not allocate memory\n");
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return -ENOMEM;
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}
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(*handle)->buffer_size = computeSize(quality);
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return 0;
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}
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int audio_release(audio_handle_t* handle)
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{
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int ret = 0;
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if (handle == 0)
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{
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printf("audio_release: null handle pointer\n");
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return -EINVAL;
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}
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if (*handle != 0)
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{
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ret = audio_close(*handle);
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free(*handle);
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*handle = 0;
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}
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return ret;
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}
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int audio_process_packet(audio_handle_t handle, char const* buffer, int size)
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{
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struct VBanHeader const* const hdr = (struct VBanHeader const*)buffer;
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int payload_size = 0;
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int ret = 0;
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long sample_rate = 0;
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int nb_samples = 0;
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int nb_channels = 0;
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int sample_size = 0;
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enum VBanBitResolution bit_resolution = VBAN_BIT_RESOLUTION_MAX;
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if ((handle == 0) || (buffer == 0))
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{
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printf("audio_process_packet: handle pointer or buffer pointer is null\n");
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return -EINVAL;
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}
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/** extract audio parameters from header */
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nb_samples = hdr->format_nbs + 1;
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nb_channels = hdr->format_nbc + 1;
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bit_resolution = (hdr->format_bit & VBAN_BIT_RESOLUTION_MASK);
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/** error in bit_resolution */
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if (bit_resolution >= VBAN_BIT_RESOLUTION_MAX)
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{
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goto end;
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}
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sample_size = VBanBitResolutionSize[bit_resolution];
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payload_size = nb_samples * sample_size * nb_channels;
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/** check expected payload size */
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if (payload_size != (size - VBAN_HEADER_SIZE))
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{
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goto end;
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}
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/** check that format is supported */
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sample_rate = ((hdr->format_SR & VBAN_SR_MASK) < VBAN_SR_MAXNUMBER)
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? VBanSRList[(hdr->format_SR & VBAN_SR_MASK)]
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: 0;
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ret = audio_is_format_supported(handle, bit_resolution, nb_channels, sample_rate);
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if (ret <= 0)
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{
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goto end;
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}
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/** check that audio device is configured at correct format */
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if ((bit_resolution != handle->bitResolution)
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|| (nb_channels != handle->nbChannels)
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|| (sample_rate != handle->rate))
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{
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/* we have to (re-)open the device with correct format */
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ret = audio_open(handle, bit_resolution, nb_channels, sample_rate);
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if (ret < 0)
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{
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/* some error occured */
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goto end;
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}
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}
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/** write payload to the audio device */
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ret = audio_write(handle, (char const*)(hdr + 1), nb_samples);
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end:
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return ret;
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}
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int audio_is_format_supported(audio_handle_t handle, enum VBanBitResolution bit_resolution, unsigned int nb_channels, unsigned int rate)
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{
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/*XXX todo */
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return 1;
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}
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int audio_open(audio_handle_t handle, enum VBanBitResolution bit_resolution, unsigned int nb_channels, unsigned int rate)
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{
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int ret = 0;
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if (handle == 0)
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{
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printf("audio_open: handle pointer is null\n");
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return -EINVAL;
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}
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ret = audio_close(handle);
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if (ret < 0)
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{
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return ret;
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}
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ret = snd_pcm_open(&handle->alsa_handle, AUDIO_DEVICE, SND_PCM_STREAM_PLAYBACK, 0);
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if (ret < 0)
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{
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printf("audio_open: open error: %s\n", snd_strerror(ret));
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handle->alsa_handle = 0;
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return ret;
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}
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ret = snd_pcm_set_params(handle->alsa_handle,
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vban_to_alsa_format(bit_resolution),
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SND_PCM_ACCESS_RW_INTERLEAVED,
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nb_channels,
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rate,
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1,
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((unsigned int)handle->buffer_size * 1000000) / rate);
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if (ret < 0)
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{
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printf("audio_open: set_params error: %s", snd_strerror(ret));
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audio_close(handle);
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return ret;
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}
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ret = snd_pcm_prepare(handle->alsa_handle);
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if (ret < 0)
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{
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printf("audio_open: prepare error: %s", snd_strerror(ret));
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audio_close(handle);
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return ret;
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}
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handle->bitResolution = bit_resolution;
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handle->nbChannels = nb_channels;
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handle->rate = rate;
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return ret;
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}
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int audio_close(audio_handle_t handle)
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{
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int ret = 0;
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if (handle == 0)
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{
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printf("audio_close: handle pointer is null\n");
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return -EINVAL;
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}
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if (handle->alsa_handle == 0)
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{
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/** nothing to do */
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return 0;
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}
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ret = snd_pcm_close(handle->alsa_handle);
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handle->alsa_handle = 0;
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return ret;
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}
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int audio_write(audio_handle_t handle, char const* data, size_t size)
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{
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int ret = 0;
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if ((handle == 0) || (data == 0))
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{
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printf("audio_write: handle or data pointer is null\n");
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return -EINVAL;
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}
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if (handle->alsa_handle == 0)
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{
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printf("audio_write: device not open\n");
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return -ENODEV;
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}
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ret = snd_pcm_writei(handle->alsa_handle, data, size);
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if (ret < 0)
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{
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printf("audio_write: snd_pcm_writei failed: %s\n", snd_strerror(ret));
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ret = snd_pcm_recover(handle->alsa_handle, ret, 0);
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if (ret < 0)
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{
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printf("audio_write: snd_pcm_writei failed: %s\n", snd_strerror(ret));
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}
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}
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else if (ret > 0 && ret < size)
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{
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printf("audio_write: short write (expected %lu, wrote %i)\n", size, ret);
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}
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return ret;
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}
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