/* * ALSA input and output * Copyright (c) 2007 Luca Abeni ( lucabe72 email it ) * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr ) * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * ALSA input and output: common code * @author Luca Abeni ( lucabe72 email it ) * @author Benoit Fouet ( benoit fouet free fr ) * @author Nicolas George ( nicolas george normalesup org ) */ #include <alsa/asoundlib.h> #include "avdevice.h" #include "libavutil/avassert.h" #include "libavutil/channel_layout.h" #include "alsa.h" static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id) { switch(codec_id) { case AV_CODEC_ID_PCM_F64LE: return SND_PCM_FORMAT_FLOAT64_LE; case AV_CODEC_ID_PCM_F64BE: return SND_PCM_FORMAT_FLOAT64_BE; case AV_CODEC_ID_PCM_F32LE: return SND_PCM_FORMAT_FLOAT_LE; case AV_CODEC_ID_PCM_F32BE: return SND_PCM_FORMAT_FLOAT_BE; case AV_CODEC_ID_PCM_S32LE: return SND_PCM_FORMAT_S32_LE; case AV_CODEC_ID_PCM_S32BE: return SND_PCM_FORMAT_S32_BE; case AV_CODEC_ID_PCM_U32LE: return SND_PCM_FORMAT_U32_LE; case AV_CODEC_ID_PCM_U32BE: return SND_PCM_FORMAT_U32_BE; case AV_CODEC_ID_PCM_S24LE: return SND_PCM_FORMAT_S24_3LE; case AV_CODEC_ID_PCM_S24BE: return SND_PCM_FORMAT_S24_3BE; case AV_CODEC_ID_PCM_U24LE: return SND_PCM_FORMAT_U24_3LE; case AV_CODEC_ID_PCM_U24BE: return SND_PCM_FORMAT_U24_3BE; case AV_CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE; case AV_CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE; case AV_CODEC_ID_PCM_U16LE: return SND_PCM_FORMAT_U16_LE; case AV_CODEC_ID_PCM_U16BE: return SND_PCM_FORMAT_U16_BE; case AV_CODEC_ID_PCM_S8: return SND_PCM_FORMAT_S8; case AV_CODEC_ID_PCM_U8: return SND_PCM_FORMAT_U8; case AV_CODEC_ID_PCM_MULAW: return SND_PCM_FORMAT_MU_LAW; case AV_CODEC_ID_PCM_ALAW: return SND_PCM_FORMAT_A_LAW; default: return SND_PCM_FORMAT_UNKNOWN; } } #define MAKE_REORDER_FUNC(NAME, TYPE, CHANNELS, LAYOUT, MAP) \ static void alsa_reorder_ ## NAME ## _ ## LAYOUT(const void *in_v, \ void *out_v, \ int n) \ { \ const TYPE *in = in_v; \ TYPE *out = out_v; \ \ while (n-- > 0) { \ MAP \ in += CHANNELS; \ out += CHANNELS; \ } \ } #define MAKE_REORDER_FUNCS(CHANNELS, LAYOUT, MAP) \ MAKE_REORDER_FUNC(int8, int8_t, CHANNELS, LAYOUT, MAP) \ MAKE_REORDER_FUNC(int16, int16_t, CHANNELS, LAYOUT, MAP) \ MAKE_REORDER_FUNC(int32, int32_t, CHANNELS, LAYOUT, MAP) \ MAKE_REORDER_FUNC(f32, float, CHANNELS, LAYOUT, MAP) MAKE_REORDER_FUNCS(5, out_50, \ out[0] = in[0]; \ out[1] = in[1]; \ out[2] = in[3]; \ out[3] = in[4]; \ out[4] = in[2]; \ ) MAKE_REORDER_FUNCS(6, out_51, \ out[0] = in[0]; \ out[1] = in[1]; \ out[2] = in[4]; \ out[3] = in[5]; \ out[4] = in[2]; \ out[5] = in[3]; \ ) MAKE_REORDER_FUNCS(8, out_71, \ out[0] = in[0]; \ out[1] = in[1]; \ out[2] = in[4]; \ out[3] = in[5]; \ out[4] = in[2]; \ out[5] = in[3]; \ out[6] = in[6]; \ out[7] = in[7]; \ ) #define FORMAT_I8 0 #define FORMAT_I16 1 #define FORMAT_I32 2 #define FORMAT_F32 3 #define PICK_REORDER(layout)\ switch(format) {\ case FORMAT_I8: s->reorder_func = alsa_reorder_int8_out_ ##layout; break;\ case FORMAT_I16: s->reorder_func = alsa_reorder_int16_out_ ##layout; break;\ case FORMAT_I32: s->reorder_func = alsa_reorder_int32_out_ ##layout; break;\ case FORMAT_F32: s->reorder_func = alsa_reorder_f32_out_ ##layout; break;\ } static av_cold int find_reorder_func(AlsaData *s, int codec_id, uint64_t layout, int out) { int format; /* reordering input is not currently supported */ if (!out) return AVERROR(ENOSYS); /* reordering is not needed for QUAD or 2_2 layout */ if (layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2) return 0; switch (codec_id) { case AV_CODEC_ID_PCM_S8: case AV_CODEC_ID_PCM_U8: case AV_CODEC_ID_PCM_ALAW: case AV_CODEC_ID_PCM_MULAW: format = FORMAT_I8; break; case AV_CODEC_ID_PCM_S16LE: case AV_CODEC_ID_PCM_S16BE: case AV_CODEC_ID_PCM_U16LE: case AV_CODEC_ID_PCM_U16BE: format = FORMAT_I16; break; case AV_CODEC_ID_PCM_S32LE: case AV_CODEC_ID_PCM_S32BE: case AV_CODEC_ID_PCM_U32LE: case AV_CODEC_ID_PCM_U32BE: format = FORMAT_I32; break; case AV_CODEC_ID_PCM_F32LE: case AV_CODEC_ID_PCM_F32BE: format = FORMAT_F32; break; default: return AVERROR(ENOSYS); } if (layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0) PICK_REORDER(50) else if (layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1) PICK_REORDER(51) else if (layout == AV_CH_LAYOUT_7POINT1) PICK_REORDER(71) return s->reorder_func ? 0 : AVERROR(ENOSYS); } av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode, unsigned int *sample_rate, int channels, enum AVCodecID *codec_id) { AlsaData *s = ctx->priv_data; const char *audio_device; int res, flags = 0; snd_pcm_format_t format; snd_pcm_t *h; snd_pcm_hw_params_t *hw_params; snd_pcm_uframes_t buffer_size, period_size; uint64_t layout = ctx->streams[0]->codecpar->channel_layout; if (ctx->url[0] == 0) audio_device = "default"; else audio_device = ctx->url; if (*codec_id == AV_CODEC_ID_NONE) *codec_id = DEFAULT_CODEC_ID; format = codec_id_to_pcm_format(*codec_id); if (format == SND_PCM_FORMAT_UNKNOWN) { av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id); return AVERROR(ENOSYS); } s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels; if (ctx->flags & AVFMT_FLAG_NONBLOCK) { flags = SND_PCM_NONBLOCK; } res = snd_pcm_open(&h, audio_device, mode, flags); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n", audio_device, snd_strerror(res)); return AVERROR(EIO); } res = snd_pcm_hw_params_malloc(&hw_params); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n", snd_strerror(res)); goto fail1; } res = snd_pcm_hw_params_any(h, hw_params); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n", snd_strerror(res)); goto fail; } res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n", snd_strerror(res)); goto fail; } res = snd_pcm_hw_params_set_format(h, hw_params, format); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n", *codec_id, format, snd_strerror(res)); goto fail; } res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n", snd_strerror(res)); goto fail; } res = snd_pcm_hw_params_set_channels(h, hw_params, channels); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n", channels, snd_strerror(res)); goto fail; } snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size); buffer_size = FFMIN(buffer_size, ALSA_BUFFER_SIZE_MAX); /* TODO: maybe use ctx->max_picture_buffer somehow */ res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n", snd_strerror(res)); goto fail; } snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL); if (!period_size) period_size = buffer_size / 4; res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n", snd_strerror(res)); goto fail; } s->period_size = period_size; res = snd_pcm_hw_params(h, hw_params); if (res < 0) { av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n", snd_strerror(res)); goto fail; } snd_pcm_hw_params_free(hw_params); if (channels > 2 && layout) { if (find_reorder_func(s, *codec_id, layout, mode == SND_PCM_STREAM_PLAYBACK) < 0) { char name[128]; av_get_channel_layout_string(name, sizeof(name), channels, layout); av_log(ctx, AV_LOG_WARNING, "ALSA channel layout unknown or unimplemented for %s %s.\n", name, mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture"); } if (s->reorder_func) { s->reorder_buf_size = buffer_size; s->reorder_buf = av_malloc_array(s->reorder_buf_size, s->frame_size); if (!s->reorder_buf) goto fail1; } } s->h = h; return 0; fail: snd_pcm_hw_params_free(hw_params); fail1: snd_pcm_close(h); return AVERROR(EIO); } av_cold int ff_alsa_close(AVFormatContext *s1) { AlsaData *s = s1->priv_data; if (snd_pcm_stream(s->h) == SND_PCM_STREAM_PLAYBACK) { snd_pcm_nonblock(s->h, 0); snd_pcm_drain(s->h); } av_freep(&s->reorder_buf); if (CONFIG_ALSA_INDEV) ff_timefilter_destroy(s->timefilter); snd_pcm_close(s->h); return 0; } int ff_alsa_xrun_recover(AVFormatContext *s1, int err) { AlsaData *s = s1->priv_data; snd_pcm_t *handle = s->h; av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n"); if (err == -EPIPE) { err = snd_pcm_prepare(handle); if (err < 0) { av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err)); return AVERROR(EIO); } } else if (err == -ESTRPIPE) { av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n"); return -1; } return err; } int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size) { int size = s->reorder_buf_size; void *r; av_assert0(size != 0); while (size < min_size) size *= 2; r = av_realloc_array(s->reorder_buf, size, s->frame_size); if (!r) return AVERROR(ENOMEM); s->reorder_buf = r; s->reorder_buf_size = size; return 0; } /* ported from alsa-utils/aplay.c */ int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type) { int ret = 0; void **hints, **n; char *name = NULL, *descr = NULL, *io = NULL, *tmp; AVDeviceInfo *new_device = NULL; const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input"; if (snd_device_name_hint(-1, "pcm", &hints) < 0) return AVERROR_EXTERNAL; n = hints; while (*n && !ret) { name = snd_device_name_get_hint(*n, "NAME"); descr = snd_device_name_get_hint(*n, "DESC"); io = snd_device_name_get_hint(*n, "IOID"); if (!io || !strcmp(io, filter)) { new_device = av_mallocz(sizeof(AVDeviceInfo)); if (!new_device) { ret = AVERROR(ENOMEM); goto fail; } new_device->device_name = av_strdup(name); if ((tmp = strrchr(descr, '\n')) && tmp[1]) new_device->device_description = av_strdup(&tmp[1]); else new_device->device_description = av_strdup(descr); if (!new_device->device_description || !new_device->device_name) { ret = AVERROR(ENOMEM); goto fail; } if ((ret = av_dynarray_add_nofree(&device_list->devices, &device_list->nb_devices, new_device)) < 0) { goto fail; } if (!strcmp(new_device->device_name, "default")) device_list->default_device = device_list->nb_devices - 1; new_device = NULL; } fail: free(io); free(name); free(descr); n++; } if (new_device) { av_free(new_device->device_description); av_free(new_device->device_name); av_free(new_device); } snd_device_name_free_hint(hints); return ret; }