lavc: add a libwavpack encoder wrapper

1 files changed, 194 insertions, 0 deletions

diff --git a/libavcodec/libwavpackenc.c b/libavcodec/libwavpackenc.c
new file mode 100644
index 0000000000..34ec013943
--- /dev/null
+++ b/libavcodec/libwavpackenc.c
@@ -0,0 +1,194 @@
+/*
+ * 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
+ */
+
+#include <wavpack/wavpack.h>
+#include <string.h>
+
+#include "libavutil/attributes.h"
+#include "libavutil/opt.h"
+#include "libavutil/samplefmt.h"
+
+#include "audio_frame_queue.h"
+#include "avcodec.h"
+#include "internal.h"
+
+#define WV_DEFAULT_BLOCK_SIZE 32768
+
+typedef struct LibWavpackContext {
+    const AVClass *class;
+    WavpackContext *wv;
+    AudioFrameQueue afq;
+
+    AVPacket *pkt;
+    int user_size;
+
+    int got_output;
+} LibWavpackContext;
+
+static int wavpack_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
+                                const AVFrame *frame, int *got_output)
+{
+    LibWavpackContext *s = avctx->priv_data;
+    int ret;
+
+    s->got_output = 0;
+    s->pkt        = pkt;
+    s->user_size  = pkt->size;
+
+    if (frame) {
+        ret = ff_af_queue_add(&s->afq, frame);
+        if (ret < 0)
+            return ret;
+
+        ret = WavpackPackSamples(s->wv, (int32_t*)frame->data[0], frame->nb_samples);
+        if (!ret) {
+            av_log(avctx, AV_LOG_ERROR, "Error encoding a frame: %s\n",
+                   WavpackGetErrorMessage(s->wv));
+            return AVERROR_UNKNOWN;
+        }
+    }
+
+    if (!s->got_output &&
+        (!frame || frame->nb_samples < avctx->frame_size)) {
+        ret = WavpackFlushSamples(s->wv);
+        if (!ret) {
+            av_log(avctx, AV_LOG_ERROR, "Error flushing the encoder: %s\n",
+                   WavpackGetErrorMessage(s->wv));
+            return AVERROR_UNKNOWN;
+        }
+    }
+
+    if (s->got_output) {
+        ff_af_queue_remove(&s->afq, avctx->frame_size, &pkt->pts, &pkt->duration);
+        *got_output = 1;
+    }
+
+    return 0;
+}
+
+static int encode_callback(void *id, void *data, int32_t count)
+{
+    AVCodecContext *avctx = id;
+    LibWavpackContext *s  = avctx->priv_data;
+    int ret, offset = s->pkt->size;
+
+    if (s->user_size) {
+        if (s->user_size - count < s->pkt->size) {
+            av_log(avctx, AV_LOG_ERROR, "Provided packet too small.\n");
+            return 0;
+        }
+        s->pkt->size += count;
+    } else {
+        ret = av_grow_packet(s->pkt, count);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR, "Error allocating output packet.\n");
+            return 0;
+        }
+    }
+
+    memcpy(s->pkt->data + offset, data, count);
+
+    s->got_output = 1;
+
+    return 1;
+}
+
+static av_cold int wavpack_encode_init(AVCodecContext *avctx)
+{
+    LibWavpackContext *s = avctx->priv_data;
+    WavpackConfig config = { 0 };
+    int ret;
+
+    s->wv = WavpackOpenFileOutput(encode_callback, avctx, NULL);
+    if (!s->wv) {
+        av_log(avctx, AV_LOG_ERROR, "Error allocating the encoder.\n");
+        return AVERROR(ENOMEM);
+    }
+
+    if (!avctx->frame_size)
+        avctx->frame_size = WV_DEFAULT_BLOCK_SIZE;
+
+    config.bytes_per_sample = 4;
+    config.bits_per_sample  = 32;
+    config.block_samples    = avctx->frame_size;
+    config.channel_mask     = avctx->channel_layout;
+    config.num_channels     = avctx->channels;
+    config.sample_rate      = avctx->sample_rate;
+
+    if (avctx->compression_level != FF_COMPRESSION_DEFAULT) {
+        if (avctx->compression_level >= 3) {
+            config.flags |= CONFIG_VERY_HIGH_FLAG;
+
+            if      (avctx->compression_level >= 8)
+                config.xmode = 6;
+            else if (avctx->compression_level >= 7)
+                config.xmode = 5;
+            else if (avctx->compression_level >= 6)
+                config.xmode = 4;
+            else if (avctx->compression_level >= 5)
+                config.xmode = 3;
+            else if (avctx->compression_level >= 4)
+                config.xmode = 2;
+        } else if (avctx->compression_level >= 2)
+            config.flags |= CONFIG_HIGH_FLAG;
+        else if (avctx->compression_level < 1)
+            config.flags |= CONFIG_FAST_FLAG;
+    }
+
+    ret = WavpackSetConfiguration(s->wv, &config, -1);
+    if (!ret)
+        goto fail;
+
+    ret = WavpackPackInit(s->wv);
+    if (!ret)
+        goto fail;
+
+    ff_af_queue_init(avctx, &s->afq);
+
+    return 0;
+
+fail:
+    av_log(avctx, AV_LOG_ERROR, "Error configuring the encoder: %s.\n",
+           WavpackGetErrorMessage(s->wv));
+    WavpackCloseFile(s->wv);
+    return AVERROR_UNKNOWN;
+}
+
+static av_cold int wavpack_encode_close(AVCodecContext *avctx)
+{
+    LibWavpackContext *s = avctx->priv_data;
+
+    WavpackCloseFile(s->wv);
+
+    ff_af_queue_close(&s->afq);
+
+    return 0;
+}
+
+AVCodec ff_libwavpack_encoder = {
+    .name           = "libwavpack",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_WAVPACK,
+    .priv_data_size = sizeof(LibWavpackContext),
+    .init           = wavpack_encode_init,
+    .encode2        = wavpack_encode_frame,
+    .close          = wavpack_encode_close,
+    .capabilities   = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
+    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S32,
+                                                     AV_SAMPLE_FMT_NONE },
+};