diff options
Diffstat (limited to 'libavdevice/alsa.c')
| -rw-r--r-- | libavdevice/alsa.c | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/libavdevice/alsa.c b/libavdevice/alsa.c new file mode 100644 index 0000000000..6d68267602 --- /dev/null +++ b/libavdevice/alsa.c @@ -0,0 +1,362 @@ +/* + * 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 Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 "libavformat/avformat.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 REORDER_OUT_50(NAME, TYPE) \ +static void alsa_reorder_ ## NAME ## _out_50(const void *in_v, void *out_v, int n) \ +{ \ + const TYPE *in = in_v; \ + TYPE *out = out_v; \ +\ + while (n-- > 0) { \ + out[0] = in[0]; \ + out[1] = in[1]; \ + out[2] = in[3]; \ + out[3] = in[4]; \ + out[4] = in[2]; \ + in += 5; \ + out += 5; \ + } \ +} + +#define REORDER_OUT_51(NAME, TYPE) \ +static void alsa_reorder_ ## NAME ## _out_51(const void *in_v, void *out_v, int n) \ +{ \ + const TYPE *in = in_v; \ + TYPE *out = out_v; \ +\ + while (n-- > 0) { \ + out[0] = in[0]; \ + out[1] = in[1]; \ + out[2] = in[4]; \ + out[3] = in[5]; \ + out[4] = in[2]; \ + out[5] = in[3]; \ + in += 6; \ + out += 6; \ + } \ +} + +#define REORDER_OUT_71(NAME, TYPE) \ +static void alsa_reorder_ ## NAME ## _out_71(const void *in_v, void *out_v, int n) \ +{ \ + const TYPE *in = in_v; \ + TYPE *out = out_v; \ +\ + while (n-- > 0) { \ + 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]; \ + in += 8; \ + out += 8; \ + } \ +} + +REORDER_OUT_50(int8, int8_t) +REORDER_OUT_51(int8, int8_t) +REORDER_OUT_71(int8, int8_t) +REORDER_OUT_50(int16, int16_t) +REORDER_OUT_51(int16, int16_t) +REORDER_OUT_71(int16, int16_t) +REORDER_OUT_50(int32, int32_t) +REORDER_OUT_51(int32, int32_t) +REORDER_OUT_71(int32, int32_t) +REORDER_OUT_50(f32, float) +REORDER_OUT_51(f32, float) +REORDER_OUT_71(f32, float) + +#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]->codec->channel_layout; + + if (ctx->filename[0] == 0) audio_device = "default"; + else audio_device = ctx->filename; + + 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(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; + + av_freep(&s->reorder_buf); + 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(s->reorder_buf, size * s->frame_size); + if (!r) + return AVERROR(ENOMEM); + s->reorder_buf = r; + s->reorder_buf_size = size; + return 0; +} |