swresample: Add AVFrame based API

Based on commit fb1ddcdc8f51b9d261ae8e9c26b91e81f7b6bf45 by Luca Barbato <lu_zero@gentoo.org>
Adapted for libswresample by Michael Niedermayer
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 158 insertions, 0 deletions

diff --git a/libswresample/swresample_frame.c b/libswresample/swresample_frame.c
new file mode 100644
index 0000000000..71d3ed711a
--- /dev/null
+++ b/libswresample/swresample_frame.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2014 Luca Barbato <lu_zero@gentoo.org>
+ * Copyright (c) 2014 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ */
+
+#include "swresample_internal.h"
+#include "libavutil/frame.h"
+#include "libavutil/opt.h"
+
+int swr_config_frame(SwrContext *s, const AVFrame *out, const AVFrame *in)
+{
+    swr_close(s);
+
+    if (in) {
+        if (av_opt_set_int(s, "icl", in->channel_layout, 0) < 0)
+            goto fail;
+        if (av_opt_set_int(s, "isf", in->format, 0) < 0)
+            goto fail;
+        if (av_opt_set_int(s, "isr", in->sample_rate, 0) < 0)
+            goto fail;
+    }
+
+    if (out) {
+        if (av_opt_set_int(s, "ocl", out->channel_layout, 0) < 0)
+            goto fail;
+        if (av_opt_set_int(s, "osf", out->format,  0) < 0)
+            goto fail;
+        if (av_opt_set_int(s, "osr", out->sample_rate, 0) < 0)
+            goto fail;
+    }
+
+    return 0;
+fail:
+    av_log(s, AV_LOG_ERROR, "Failed to set option\n");
+    return AVERROR(EINVAL);
+}
+
+static int config_changed(SwrContext *s,
+                          const AVFrame *out, const AVFrame *in)
+{
+    int ret = 0;
+
+    if (in) {
+        if (s->in_ch_layout   != in->channel_layout ||
+            s->in_sample_rate != in->sample_rate ||
+            s->in_sample_fmt  != in->format) {
+            ret |= AVERROR_INPUT_CHANGED;
+        }
+    }
+
+    if (out) {
+        if (s->out_ch_layout   != out->channel_layout ||
+            s->out_sample_rate != out->sample_rate ||
+            s->out_sample_fmt  != out->format) {
+            ret |= AVERROR_OUTPUT_CHANGED;
+        }
+    }
+
+    return ret;
+}
+
+static inline int convert_frame(SwrContext *s,
+                                AVFrame *out, const AVFrame *in)
+{
+    int ret;
+    uint8_t **out_data = NULL;
+    const uint8_t **in_data = NULL;
+    int out_nb_samples = 0, in_nb_samples = 0;
+
+    if (out) {
+        out_data       = out->extended_data;
+        out_nb_samples = out->nb_samples;
+    }
+
+    if (in) {
+        in_data       = (const uint8_t **)in->extended_data;
+        in_nb_samples = in->nb_samples;
+    }
+
+    ret = swr_convert(s, out_data, out_nb_samples, in_data, in_nb_samples);
+
+    if (ret < 0) {
+        if (out)
+            out->nb_samples = 0;
+        return ret;
+    }
+
+    if (out)
+        out->nb_samples = ret;
+
+    return 0;
+}
+
+static inline int available_samples(AVFrame *out)
+{
+    int bytes_per_sample = av_get_bytes_per_sample(out->format);
+    int samples = out->linesize[0] / bytes_per_sample;
+
+    if (av_sample_fmt_is_planar(out->format)) {
+        return samples;
+    } else {
+        int channels = av_get_channel_layout_nb_channels(out->channel_layout);
+        return samples / channels;
+    }
+}
+
+int swr_convert_frame(SwrContext *s,
+                      AVFrame *out, const AVFrame *in)
+{
+    int ret, setup = 0;
+
+    if (!swr_is_initialized(s)) {
+        if ((ret = swr_config_frame(s, out, in)) < 0)
+            return ret;
+        if ((ret = swr_init(s)) < 0)
+            return ret;
+        setup = 1;
+    } else {
+        // return as is or reconfigure for input changes?
+        if ((ret = config_changed(s, out, in)))
+            return ret;
+    }
+
+    if (out) {
+        if (!out->linesize[0]) {
+            out->nb_samples =   swr_get_delay(s, s->out_sample_rate)
+                              + in->nb_samples*(int64_t)s->out_sample_rate / s->in_sample_rate
+                              + 3;
+            if ((ret = av_frame_get_buffer(out, 0)) < 0) {
+                if (setup)
+                    swr_close(s);
+                return ret;
+            }
+        } else {
+            if (!out->nb_samples)
+                out->nb_samples = available_samples(out);
+        }
+    }
+
+    return convert_frame(s, out, in);
+}
+