High Definition Compatible Digital (HDCD) decoder filter, using libhdcd

Signed-off-by: Burt P <pburt0@gmail.com>
Signed-off-by: Diego Biurrun <diego@biurrun.de>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

4 files changed, 200 insertions, 1 deletions

diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index dea8ffa..c3c1bea 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -34,6 +34,7 @@ OBJS-$(CONFIG_BS2B_FILTER)                   += af_bs2b.o
 OBJS-$(CONFIG_CHANNELMAP_FILTER)             += af_channelmap.o
 OBJS-$(CONFIG_CHANNELSPLIT_FILTER)           += af_channelsplit.o
 OBJS-$(CONFIG_COMPAND_FILTER)                += af_compand.o
+OBJS-$(CONFIG_HDCD_FILTER)                   += af_hdcd.o
 OBJS-$(CONFIG_JOIN_FILTER)                   += af_join.o
 OBJS-$(CONFIG_RESAMPLE_FILTER)               += af_resample.o
 OBJS-$(CONFIG_VOLUME_FILTER)                 += af_volume.o
diff --git a/libavfilter/af_hdcd.c b/libavfilter/af_hdcd.c
new file mode 100644
index 0000000..b9dadec
--- /dev/null
+++ b/libavfilter/af_hdcd.c
@@ -0,0 +1,197 @@
+/*
+ * 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
+ * HDCD decoding filter, using libhdcd
+ */
+
+#include <hdcd/hdcd_simple.h>
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/opt.h"
+
+#include "audio.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+
+typedef struct HDCDContext {
+    const AVClass *class;
+
+    hdcd_simple *shdcd;
+
+    /* AVOption members */
+    /** analyze mode replaces the audio with a solid tone and adjusts
+     *  the amplitude to signal some specific aspect of the decoding
+     *  process. See docs or HDCD_ANA_* defines. */
+    int analyze_mode;
+    /* end AVOption members */
+} HDCDContext;
+
+#define OFFSET(x) offsetof(HDCDContext, x)
+#define A AV_OPT_FLAG_AUDIO_PARAM
+#define HDCD_ANA_MAX 6
+static const AVOption hdcd_options[] = {
+    { "analyze_mode",  "Replace audio with solid tone and signal some processing aspect in the amplitude.",
+      OFFSET(analyze_mode), AV_OPT_TYPE_INT, { .i64=HDCD_ANA_OFF }, 0, HDCD_ANA_MAX, A, "analyze_mode"},
+    { "off",  HDCD_ANA_OFF_DESC,  0, AV_OPT_TYPE_CONST, { .i64 = HDCD_ANA_OFF},  0, 0, A, "analyze_mode" },
+    { "lle",  HDCD_ANA_LLE_DESC,  0, AV_OPT_TYPE_CONST, { .i64 = HDCD_ANA_LLE},  0, 0, A, "analyze_mode" },
+    { "pe",   HDCD_ANA_PE_DESC,   0, AV_OPT_TYPE_CONST, { .i64 = HDCD_ANA_PE},   0, 0, A, "analyze_mode" },
+    { "cdt",  HDCD_ANA_CDT_DESC,  0, AV_OPT_TYPE_CONST, { .i64 = HDCD_ANA_CDT},  0, 0, A, "analyze_mode" },
+    { "tgm",  HDCD_ANA_TGM_DESC,  0, AV_OPT_TYPE_CONST, { .i64 = HDCD_ANA_TGM},  0, 0, A, "analyze_mode" },
+    { "pel",  HDCD_ANA_PEL_DESC,  0, AV_OPT_TYPE_CONST, { .i64 = HDCD_ANA_PEL},  0, 0, A, "analyze_mode" },
+    { "ltgm", HDCD_ANA_LTGM_DESC, 0, AV_OPT_TYPE_CONST, { .i64 = HDCD_ANA_LTGM}, 0, 0, A, "analyze_mode" },
+    { NULL }
+};
+
+static const AVClass hdcd_class = {
+    .class_name = "HDCD filter",
+    .item_name  = av_default_item_name,
+    .option     = hdcd_options,
+    .version    = LIBAVFILTER_VERSION_INT,
+};
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    HDCDContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AVFrame *out;
+    const int16_t *in_data;
+    int32_t *out_data;
+    int n, result;
+    int channel_count = av_get_channel_layout_nb_channels(in->channel_layout);
+
+    out = ff_get_audio_buffer(outlink, in->nb_samples);
+    if (!out) {
+        av_frame_free(&in);
+        return AVERROR(ENOMEM);
+    }
+    result = av_frame_copy_props(out, in);
+    if (result) {
+        av_frame_free(&out);
+        av_frame_free(&in);
+        return result;
+    }
+
+    in_data  = (int16_t *)in->data[0];
+    out_data = (int32_t *)out->data[0];
+    for (n = 0; n < in->nb_samples * channel_count; n++)
+        out_data[n] = in_data[n];
+
+    hdcd_process(s->shdcd, out_data, in->nb_samples);
+
+    av_frame_free(&in);
+    return ff_filter_frame(outlink, out);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *in_formats, *out_formats, *sample_rates = NULL;
+    AVFilterChannelLayouts *layouts = NULL;
+    AVFilterLink *inlink  = ctx->inputs[0];
+    AVFilterLink *outlink = ctx->outputs[0];
+
+    static const enum AVSampleFormat sample_fmts_in[] = {
+        AV_SAMPLE_FMT_S16,
+        AV_SAMPLE_FMT_NONE
+    };
+    static const enum AVSampleFormat sample_fmts_out[] = {
+        AV_SAMPLE_FMT_S32,
+        AV_SAMPLE_FMT_NONE
+    };
+
+    ff_add_channel_layout(&layouts, AV_CH_LAYOUT_STEREO);
+
+    ff_set_common_channel_layouts(ctx, layouts);
+
+    in_formats  = ff_make_format_list(sample_fmts_in);
+    out_formats = ff_make_format_list(sample_fmts_out);
+    if (!in_formats || !out_formats)
+        return AVERROR(ENOMEM);
+
+    ff_formats_ref(in_formats, &inlink->out_formats);
+    ff_formats_ref(out_formats, &outlink->in_formats);
+
+    ff_add_format(&sample_rates, 44100);
+    ff_set_common_samplerates(ctx, sample_rates);
+    return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    HDCDContext *s = ctx->priv;
+    char detect_str[256] = "";
+
+    /* log the HDCD decode information */
+    hdcd_detect_str(s->shdcd, detect_str, sizeof(detect_str));
+    av_log(ctx, AV_LOG_INFO, "%s\n", detect_str);
+
+    hdcd_free(s->shdcd);
+}
+
+/** callback for error logging */
+static void af_hdcd_log(const void *priv, const char *fmt, va_list args)
+{
+    av_vlog((AVFilterContext *)priv, AV_LOG_VERBOSE, fmt, args);
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    HDCDContext *s = ctx->priv;
+
+    s->shdcd = hdcd_new();
+    hdcd_logger_attach(s->shdcd, af_hdcd_log, ctx);
+
+    if (s->analyze_mode)
+        hdcd_analyze_mode(s->shdcd, s->analyze_mode);
+    av_log(ctx, AV_LOG_VERBOSE, "Analyze mode: [%d] %s\n",
+           s->analyze_mode, hdcd_str_analyze_mode_desc(s->analyze_mode));
+
+    return 0;
+}
+
+static const AVFilterPad avfilter_af_hdcd_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_AUDIO,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad avfilter_af_hdcd_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_AUDIO,
+    },
+    { NULL }
+};
+
+AVFilter ff_af_hdcd = {
+    .name          = "hdcd",
+    .description   = NULL_IF_CONFIG_SMALL("Apply High Definition Compatible Digital (HDCD) decoding."),
+    .priv_size     = sizeof(HDCDContext),
+    .priv_class    = &hdcd_class,
+    .init          = init,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = avfilter_af_hdcd_inputs,
+    .outputs       = avfilter_af_hdcd_outputs,
+};
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index de49d65..ec27b5a 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -57,6 +57,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(CHANNELMAP,     channelmap,     af);
     REGISTER_FILTER(CHANNELSPLIT,   channelsplit,   af);
     REGISTER_FILTER(COMPAND,        compand,        af);
+    REGISTER_FILTER(HDCD,           hdcd,           af);
     REGISTER_FILTER(JOIN,           join,           af);
     REGISTER_FILTER(RESAMPLE,       resample,       af);
     REGISTER_FILTER(VOLUME,         volume,         af);
diff --git a/libavfilter/version.h b/libavfilter/version.h
index 7f3ede2..febfc8f 100644
--- a/libavfilter/version.h
+++ b/libavfilter/version.h
@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  6
-#define LIBAVFILTER_VERSION_MINOR  6
+#define LIBAVFILTER_VERSION_MINOR  7
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \