avdevice: Apply a more consistent file naming scheme

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;
+}