ffmpeg / libavdevice / alsa-audio-common.c @ 1e96d4c7
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/*
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* ALSA input and output
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* Copyright (c) 2007 Luca Abeni ( lucabe72 email it )
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* Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr )
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* ALSA input and output: common code
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* @author Luca Abeni ( lucabe72 email it )
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* @author Benoit Fouet ( benoit fouet free fr )
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* @author Nicolas George ( nicolas george normalesup org )
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*/
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#include <alsa/asoundlib.h> |
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#include "libavformat/avformat.h" |
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#include "alsa-audio.h" |
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static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id) |
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{ |
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switch(codec_id) {
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case CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE; |
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case CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE; |
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case CODEC_ID_PCM_S8: return SND_PCM_FORMAT_S8; |
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default: return SND_PCM_FORMAT_UNKNOWN; |
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} |
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} |
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static void alsa_reorder_s16_out_51(const void *in_v, void *out_v, int n) |
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{ |
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const int16_t *in = in_v;
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int16_t *out = out_v; |
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while (n-- > 0) { |
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out[0] = in[0]; |
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out[1] = in[1]; |
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out[2] = in[4]; |
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out[3] = in[5]; |
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out[4] = in[2]; |
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out[5] = in[3]; |
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in += 6;
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out += 6;
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} |
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} |
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static void alsa_reorder_s16_out_71(const void *in_v, void *out_v, int n) |
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{ |
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const int16_t *in = in_v;
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int16_t *out = out_v; |
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while (n-- > 0) { |
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out[0] = in[0]; |
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out[1] = in[1]; |
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out[2] = in[4]; |
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out[3] = in[5]; |
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out[4] = in[2]; |
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out[5] = in[3]; |
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out[6] = in[6]; |
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out[7] = in[7]; |
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in += 8;
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out += 8;
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} |
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} |
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#define REORDER_DUMMY ((void *)1) |
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static av_cold ff_reorder_func find_reorder_func(int codec_id, |
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int64_t layout, |
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int out)
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{ |
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return
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codec_id == CODEC_ID_PCM_S16LE || codec_id == CODEC_ID_PCM_S16BE ? |
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layout == AV_CH_LAYOUT_QUAD ? REORDER_DUMMY : |
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layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1 ? |
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out ? alsa_reorder_s16_out_51 : NULL :
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layout == AV_CH_LAYOUT_7POINT1 ? |
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out ? alsa_reorder_s16_out_71 : NULL :
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NULL :
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NULL;
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} |
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av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
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unsigned int *sample_rate, |
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int channels, enum CodecID *codec_id) |
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{ |
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AlsaData *s = ctx->priv_data; |
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const char *audio_device; |
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int res, flags = 0; |
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snd_pcm_format_t format; |
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snd_pcm_t *h; |
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snd_pcm_hw_params_t *hw_params; |
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snd_pcm_uframes_t buffer_size, period_size; |
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int64_t layout = ctx->streams[0]->codec->channel_layout;
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if (ctx->filename[0] == 0) audio_device = "default"; |
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else audio_device = ctx->filename;
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if (*codec_id == CODEC_ID_NONE)
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*codec_id = DEFAULT_CODEC_ID; |
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format = codec_id_to_pcm_format(*codec_id); |
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if (format == SND_PCM_FORMAT_UNKNOWN) {
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av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id);
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return AVERROR(ENOSYS);
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} |
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s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels;
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if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
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flags = SND_PCM_NONBLOCK; |
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} |
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res = snd_pcm_open(&h, audio_device, mode, flags); |
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n",
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audio_device, snd_strerror(res)); |
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return AVERROR(EIO);
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} |
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res = snd_pcm_hw_params_malloc(&hw_params); |
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n",
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snd_strerror(res)); |
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goto fail1;
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} |
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res = snd_pcm_hw_params_any(h, hw_params); |
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n",
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snd_strerror(res)); |
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goto fail;
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} |
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res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); |
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n",
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snd_strerror(res)); |
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goto fail;
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} |
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res = snd_pcm_hw_params_set_format(h, hw_params, format); |
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n",
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*codec_id, format, snd_strerror(res)); |
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goto fail;
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} |
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res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0);
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n",
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snd_strerror(res)); |
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goto fail;
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} |
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res = snd_pcm_hw_params_set_channels(h, hw_params, channels); |
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n",
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channels, snd_strerror(res)); |
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goto fail;
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} |
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snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size); |
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/* TODO: maybe use ctx->max_picture_buffer somehow */
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res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size); |
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n",
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snd_strerror(res)); |
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goto fail;
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} |
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snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL);
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res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL);
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n",
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snd_strerror(res)); |
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goto fail;
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} |
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s->period_size = period_size; |
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res = snd_pcm_hw_params(h, hw_params); |
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if (res < 0) { |
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av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n",
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snd_strerror(res)); |
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goto fail;
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} |
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snd_pcm_hw_params_free(hw_params); |
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if (channels > 2 && layout) { |
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s->reorder_func = find_reorder_func(*codec_id, layout, |
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mode == SND_PCM_STREAM_PLAYBACK); |
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if (s->reorder_func == REORDER_DUMMY) {
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s->reorder_func = NULL;
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} else if (s->reorder_func) { |
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s->reorder_buf_size = buffer_size; |
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s->reorder_buf = av_malloc(s->reorder_buf_size * s->frame_size); |
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if (!s->reorder_buf)
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goto fail1;
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} else {
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char name[16]; |
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av_get_channel_layout_string(name, sizeof(name), channels, layout);
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av_log(ctx, AV_LOG_WARNING, |
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"ALSA channel layout unknown or unimplemented for %s %s.\n",
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name, |
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mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture"); |
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} |
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} |
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s->h = h; |
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return 0; |
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fail:
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snd_pcm_hw_params_free(hw_params); |
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fail1:
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snd_pcm_close(h); |
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return AVERROR(EIO);
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} |
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av_cold int ff_alsa_close(AVFormatContext *s1)
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{ |
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AlsaData *s = s1->priv_data; |
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av_freep(&s->reorder_buf); |
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snd_pcm_close(s->h); |
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return 0; |
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} |
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int ff_alsa_xrun_recover(AVFormatContext *s1, int err) |
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{ |
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AlsaData *s = s1->priv_data; |
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snd_pcm_t *handle = s->h; |
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av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n");
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if (err == -EPIPE) {
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err = snd_pcm_prepare(handle); |
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if (err < 0) { |
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av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err));
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return AVERROR(EIO);
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} |
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} else if (err == -ESTRPIPE) { |
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av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n");
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return -1; |
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} |
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return err;
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} |
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int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size) |
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{ |
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int size = s->reorder_buf_size;
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void *r;
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while (size < min_size)
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size *= 2;
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r = av_realloc(s->reorder_buf, size * s->frame_size); |
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if (!r)
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return AVERROR(ENOMEM);
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s->reorder_buf = r; |
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s->reorder_buf_size = size; |
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return 0; |
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} |