[deb_ffmpeg.git] / ffmpeg / libavdevice / alsa-audio-common.c

/*
 * 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-audio.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]->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);
    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(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;
            }
            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;
}
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* ALSA input and output
	3	* Copyright (c) 2007 Luca Abeni ( lucabe72 email it )
	4	* Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr )
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	/**
	24	* @file
	25	* ALSA input and output: common code
	26	* @author Luca Abeni ( lucabe72 email it )
	27	* @author Benoit Fouet ( benoit fouet free fr )
	28	* @author Nicolas George ( nicolas george normalesup org )
	29	*/
	30
	31	#include <alsa/asoundlib.h>
	32	#include "avdevice.h"
	33	#include "libavutil/avassert.h"
	34	#include "libavutil/channel_layout.h"
	35
	36	#include "alsa-audio.h"
	37
	38	static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id)
	39	{
	40	switch(codec_id) {
	41	case AV_CODEC_ID_PCM_F64LE: return SND_PCM_FORMAT_FLOAT64_LE;
	42	case AV_CODEC_ID_PCM_F64BE: return SND_PCM_FORMAT_FLOAT64_BE;
	43	case AV_CODEC_ID_PCM_F32LE: return SND_PCM_FORMAT_FLOAT_LE;
	44	case AV_CODEC_ID_PCM_F32BE: return SND_PCM_FORMAT_FLOAT_BE;
	45	case AV_CODEC_ID_PCM_S32LE: return SND_PCM_FORMAT_S32_LE;
	46	case AV_CODEC_ID_PCM_S32BE: return SND_PCM_FORMAT_S32_BE;
	47	case AV_CODEC_ID_PCM_U32LE: return SND_PCM_FORMAT_U32_LE;
	48	case AV_CODEC_ID_PCM_U32BE: return SND_PCM_FORMAT_U32_BE;
	49	case AV_CODEC_ID_PCM_S24LE: return SND_PCM_FORMAT_S24_3LE;
	50	case AV_CODEC_ID_PCM_S24BE: return SND_PCM_FORMAT_S24_3BE;
	51	case AV_CODEC_ID_PCM_U24LE: return SND_PCM_FORMAT_U24_3LE;
	52	case AV_CODEC_ID_PCM_U24BE: return SND_PCM_FORMAT_U24_3BE;
	53	case AV_CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE;
	54	case AV_CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE;
	55	case AV_CODEC_ID_PCM_U16LE: return SND_PCM_FORMAT_U16_LE;
	56	case AV_CODEC_ID_PCM_U16BE: return SND_PCM_FORMAT_U16_BE;
	57	case AV_CODEC_ID_PCM_S8: return SND_PCM_FORMAT_S8;
	58	case AV_CODEC_ID_PCM_U8: return SND_PCM_FORMAT_U8;
	59	case AV_CODEC_ID_PCM_MULAW: return SND_PCM_FORMAT_MU_LAW;
	60	case AV_CODEC_ID_PCM_ALAW: return SND_PCM_FORMAT_A_LAW;
	61	default: return SND_PCM_FORMAT_UNKNOWN;
	62	}
	63	}
	64
65	#define MAKE_REORDER_FUNC(NAME, TYPE, CHANNELS, LAYOUT, MAP) \
66	static void alsa_reorder_ ## NAME ## _ ## LAYOUT(const void *in_v, \
67	void *out_v, \
68	int n) \
69	{ \
70	const TYPE *in = in_v; \
71	TYPE *out = out_v; \
72	\
73	while (n-- > 0) { \
74	MAP \
75	in += CHANNELS; \
76	out += CHANNELS; \
77	} \
78	}
79
80	#define MAKE_REORDER_FUNCS(CHANNELS, LAYOUT, MAP) \
81	MAKE_REORDER_FUNC(int8, int8_t, CHANNELS, LAYOUT, MAP) \
82	MAKE_REORDER_FUNC(int16, int16_t, CHANNELS, LAYOUT, MAP) \
83	MAKE_REORDER_FUNC(int32, int32_t, CHANNELS, LAYOUT, MAP) \
84	MAKE_REORDER_FUNC(f32, float, CHANNELS, LAYOUT, MAP)
85
86	MAKE_REORDER_FUNCS(5, out_50, \
87	out[0] = in[0]; \
88	out[1] = in[1]; \
89	out[2] = in[3]; \
90	out[3] = in[4]; \
91	out[4] = in[2]; \
92	);
93
94	MAKE_REORDER_FUNCS(6, out_51, \
95	out[0] = in[0]; \
96	out[1] = in[1]; \
97	out[2] = in[4]; \
98	out[3] = in[5]; \
99	out[4] = in[2]; \
100	out[5] = in[3]; \
101	);
102
103	MAKE_REORDER_FUNCS(8, out_71, \
104	out[0] = in[0]; \
105	out[1] = in[1]; \
106	out[2] = in[4]; \
107	out[3] = in[5]; \
108	out[4] = in[2]; \
109	out[5] = in[3]; \
110	out[6] = in[6]; \
111	out[7] = in[7]; \
112	);
113
114	#define FORMAT_I8 0
115	#define FORMAT_I16 1
116	#define FORMAT_I32 2
117	#define FORMAT_F32 3
118
119	#define PICK_REORDER(layout)\
120	switch(format) {\
121	case FORMAT_I8: s->reorder_func = alsa_reorder_int8_out_ ##layout; break;\
122	case FORMAT_I16: s->reorder_func = alsa_reorder_int16_out_ ##layout; break;\
123	case FORMAT_I32: s->reorder_func = alsa_reorder_int32_out_ ##layout; break;\
124	case FORMAT_F32: s->reorder_func = alsa_reorder_f32_out_ ##layout; break;\
125	}
126
127	static av_cold int find_reorder_func(AlsaData *s, int codec_id, uint64_t layout, int out)
128	{
129	int format;
130
131	/* reordering input is not currently supported */
132	if (!out)
133	return AVERROR(ENOSYS);
134
135	/* reordering is not needed for QUAD or 2_2 layout */
136	if (layout == AV_CH_LAYOUT_QUAD \|\| layout == AV_CH_LAYOUT_2_2)
137	return 0;
138
139	switch (codec_id) {
140	case AV_CODEC_ID_PCM_S8:
141	case AV_CODEC_ID_PCM_U8:
142	case AV_CODEC_ID_PCM_ALAW:
143	case AV_CODEC_ID_PCM_MULAW: format = FORMAT_I8; break;
144	case AV_CODEC_ID_PCM_S16LE:
145	case AV_CODEC_ID_PCM_S16BE:
146	case AV_CODEC_ID_PCM_U16LE:
147	case AV_CODEC_ID_PCM_U16BE: format = FORMAT_I16; break;
148	case AV_CODEC_ID_PCM_S32LE:
149	case AV_CODEC_ID_PCM_S32BE:
150	case AV_CODEC_ID_PCM_U32LE:
151	case AV_CODEC_ID_PCM_U32BE: format = FORMAT_I32; break;
152	case AV_CODEC_ID_PCM_F32LE:
153	case AV_CODEC_ID_PCM_F32BE: format = FORMAT_F32; break;
154	default: return AVERROR(ENOSYS);
155	}
156
157	if (layout == AV_CH_LAYOUT_5POINT0_BACK \|\| layout == AV_CH_LAYOUT_5POINT0)
158	PICK_REORDER(50)
159	else if (layout == AV_CH_LAYOUT_5POINT1_BACK \|\| layout == AV_CH_LAYOUT_5POINT1)
160	PICK_REORDER(51)
161	else if (layout == AV_CH_LAYOUT_7POINT1)
162	PICK_REORDER(71)
163
164	return s->reorder_func ? 0 : AVERROR(ENOSYS);
165	}
166
167	av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode,
168	unsigned int *sample_rate,
169	int channels, enum AVCodecID *codec_id)
170	{
171	AlsaData *s = ctx->priv_data;
172	const char *audio_device;
173	int res, flags = 0;
174	snd_pcm_format_t format;
175	snd_pcm_t *h;
176	snd_pcm_hw_params_t *hw_params;
177	snd_pcm_uframes_t buffer_size, period_size;
178	uint64_t layout = ctx->streams[0]->codec->channel_layout;
179
180	if (ctx->filename[0] == 0) audio_device = "default";
181	else audio_device = ctx->filename;
182
183	if (*codec_id == AV_CODEC_ID_NONE)
184	*codec_id = DEFAULT_CODEC_ID;
185	format = codec_id_to_pcm_format(*codec_id);
186	if (format == SND_PCM_FORMAT_UNKNOWN) {
187	av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id);
188	return AVERROR(ENOSYS);
189	}
190	s->frame_size = av_get_bits_per_sample(codec_id) / 8 channels;
191
192	if (ctx->flags & AVFMT_FLAG_NONBLOCK) {
193	flags = SND_PCM_NONBLOCK;
194	}
195	res = snd_pcm_open(&h, audio_device, mode, flags);
196	if (res < 0) {
197	av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n",
198	audio_device, snd_strerror(res));
199	return AVERROR(EIO);
200	}
201
202	res = snd_pcm_hw_params_malloc(&hw_params);
203	if (res < 0) {
204	av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n",
205	snd_strerror(res));
206	goto fail1;
207	}
208
209	res = snd_pcm_hw_params_any(h, hw_params);
210	if (res < 0) {
211	av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n",
212	snd_strerror(res));
213	goto fail;
214	}
215
216	res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
217	if (res < 0) {
218	av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n",
219	snd_strerror(res));
220	goto fail;
221	}
222
223	res = snd_pcm_hw_params_set_format(h, hw_params, format);
224	if (res < 0) {
225	av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n",
226	*codec_id, format, snd_strerror(res));
227	goto fail;
228	}
229
230	res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0);
231	if (res < 0) {
232	av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n",
233	snd_strerror(res));
234	goto fail;
235	}
236
237	res = snd_pcm_hw_params_set_channels(h, hw_params, channels);
238	if (res < 0) {
239	av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n",
240	channels, snd_strerror(res));
241	goto fail;
242	}
243
244	snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size);
245	buffer_size = FFMIN(buffer_size, ALSA_BUFFER_SIZE_MAX);
246	/* TODO: maybe use ctx->max_picture_buffer somehow */
247	res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size);
248	if (res < 0) {
249	av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n",
250	snd_strerror(res));
251	goto fail;
252	}
253
254	snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL);
255	if (!period_size)
256	period_size = buffer_size / 4;
257	res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL);
258	if (res < 0) {
259	av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n",
260	snd_strerror(res));
261	goto fail;
262	}
263	s->period_size = period_size;
264
265	res = snd_pcm_hw_params(h, hw_params);
266	if (res < 0) {
267	av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n",
268	snd_strerror(res));
269	goto fail;
270	}
271
272	snd_pcm_hw_params_free(hw_params);
273
274	if (channels > 2 && layout) {
275	if (find_reorder_func(s, *codec_id, layout, mode == SND_PCM_STREAM_PLAYBACK) < 0) {
276	char name[128];
277	av_get_channel_layout_string(name, sizeof(name), channels, layout);
278	av_log(ctx, AV_LOG_WARNING, "ALSA channel layout unknown or unimplemented for %s %s.\n",
279	name, mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture");
280	}
281	if (s->reorder_func) {
282	s->reorder_buf_size = buffer_size;
283	s->reorder_buf = av_malloc(s->reorder_buf_size * s->frame_size);
284	if (!s->reorder_buf)
285	goto fail1;
286	}
287	}
288
289	s->h = h;
290	return 0;
291
292	fail:
293	snd_pcm_hw_params_free(hw_params);
294	fail1:
295	snd_pcm_close(h);
296	return AVERROR(EIO);
297	}
298
299	av_cold int ff_alsa_close(AVFormatContext *s1)
300	{
301	AlsaData *s = s1->priv_data;
302
303	av_freep(&s->reorder_buf);
304	if (CONFIG_ALSA_INDEV)
305	ff_timefilter_destroy(s->timefilter);
306	snd_pcm_close(s->h);
307	return 0;
308	}
309
310	int ff_alsa_xrun_recover(AVFormatContext *s1, int err)
311	{
312	AlsaData *s = s1->priv_data;
313	snd_pcm_t *handle = s->h;
314
315	av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n");
316	if (err == -EPIPE) {
317	err = snd_pcm_prepare(handle);
318	if (err < 0) {
319	av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err));
320
321	return AVERROR(EIO);
322	}
323	} else if (err == -ESTRPIPE) {
324	av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n");
325
326	return -1;
327	}
328	return err;
329	}
330
331	int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size)
332	{
333	int size = s->reorder_buf_size;
334	void *r;
335
336	av_assert0(size != 0);
337	while (size < min_size)
338	size *= 2;
339	r = av_realloc(s->reorder_buf, size * s->frame_size);
340	if (!r)
341	return AVERROR(ENOMEM);
342	s->reorder_buf = r;
343	s->reorder_buf_size = size;
344	return 0;
345	}
f6fa7814 DM	346
	347	/* ported from alsa-utils/aplay.c */
	348	int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type)
	349	{
	350	int ret = 0;
	351	void hints, n;
	352	char name = NULL, descr = NULL, io = NULL, tmp;
	353	AVDeviceInfo *new_device = NULL;
	354	const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input";
	355
	356	if (snd_device_name_hint(-1, "pcm", &hints) < 0)
	357	return AVERROR_EXTERNAL;
	358	n = hints;
	359	while (*n && !ret) {
	360	name = snd_device_name_get_hint(*n, "NAME");
	361	descr = snd_device_name_get_hint(*n, "DESC");
	362	io = snd_device_name_get_hint(*n, "IOID");
	363	if (!io \|\| !strcmp(io, filter)) {
	364	new_device = av_mallocz(sizeof(AVDeviceInfo));
	365	if (!new_device) {
	366	ret = AVERROR(ENOMEM);
	367	goto fail;
	368	}
	369	new_device->device_name = av_strdup(name);
	370	if ((tmp = strrchr(descr, '\n')) && tmp[1])
	371	new_device->device_description = av_strdup(&tmp[1]);
	372	else
	373	new_device->device_description = av_strdup(descr);
	374	if (!new_device->device_description \|\| !new_device->device_name) {
	375	ret = AVERROR(ENOMEM);
	376	goto fail;
	377	}
	378	if ((ret = av_dynarray_add_nofree(&device_list->devices,
	379	&device_list->nb_devices, new_device)) < 0) {
	380	goto fail;
	381	}
	382	new_device = NULL;
	383	}
	384	fail:
	385	free(io);
	386	free(name);
	387	free(descr);
	388	n++;
	389	}
	390	if (new_device) {
	391	av_free(new_device->device_description);
	392	av_free(new_device->device_name);
	393	av_free(new_device);
	394	}
	395	snd_device_name_free_hint(hints);
	396	return ret;
	397	}