SRS5: MP3: Support decode mp3 by FFmpeg natively. (#296) (#3340)

PICK 1c5788c638

trunk/3rdparty/ffmpeg-4-fit/libavcodec/mpegaudiodec_float.c

@@ -0,0 +1,124 @@
+/*
+ * Float MPEG Audio decoder
+ * Copyright (c) 2010 Michael Niedermayer
+ *
+ * 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 "config.h"
+#include "libavutil/samplefmt.h"
+
+#define USE_FLOATS 1
+
+#include "mpegaudio.h"
+
+#define SHR(a,b)       ((a)*(1.0f/(1<<(b))))
+#define FIXR_OLD(a)    ((int)((a) * FRAC_ONE + 0.5))
+#define FIXR(x)        ((float)(x))
+#define FIXHR(x)       ((float)(x))
+#define MULH3(x, y, s) ((s)*(y)*(x))
+#define MULLx(x, y, s) ((y)*(x))
+#define RENAME(a) a ## _float
+#define OUT_FMT   AV_SAMPLE_FMT_FLT
+#define OUT_FMT_P AV_SAMPLE_FMT_FLTP
+
+#include "mpegaudiodec_template.c"
+
+#if CONFIG_MP1FLOAT_DECODER
+AVCodec ff_mp1float_decoder = {
+    .name           = "mp1float",
+    .long_name      = NULL_IF_CONFIG_SMALL("MP1 (MPEG audio layer 1)"),
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_MP1,
+    .priv_data_size = sizeof(MPADecodeContext),
+    .init           = decode_init,
+    .close          = decode_close,
+    .decode         = decode_frame,
+    .capabilities   = AV_CODEC_CAP_DR1,
+    .flush          = flush,
+    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+                                                      AV_SAMPLE_FMT_FLT,
+                                                      AV_SAMPLE_FMT_NONE },
+};
+#endif
+#if CONFIG_MP2FLOAT_DECODER
+AVCodec ff_mp2float_decoder = {
+    .name           = "mp2float",
+    .long_name      = NULL_IF_CONFIG_SMALL("MP2 (MPEG audio layer 2)"),
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_MP2,
+    .priv_data_size = sizeof(MPADecodeContext),
+    .init           = decode_init,
+    .decode         = decode_frame,
+    .close          = decode_close,
+    .capabilities   = AV_CODEC_CAP_DR1,
+    .flush          = flush,
+    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+                                                      AV_SAMPLE_FMT_FLT,
+                                                      AV_SAMPLE_FMT_NONE },
+};
+#endif
+#if CONFIG_MP3FLOAT_DECODER
+AVCodec ff_mp3float_decoder = {
+    .name           = "mp3float",
+    .long_name      = NULL_IF_CONFIG_SMALL("MP3 (MPEG audio layer 3)"),
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_MP3,
+    .priv_data_size = sizeof(MPADecodeContext),
+    .init           = decode_init,
+    .close          = decode_close,
+    .decode         = decode_frame,
+    .capabilities   = AV_CODEC_CAP_DR1,
+    .flush          = flush,
+    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+                                                      AV_SAMPLE_FMT_FLT,
+                                                      AV_SAMPLE_FMT_NONE },
+};
+#endif
+#if CONFIG_MP3ADUFLOAT_DECODER
+AVCodec ff_mp3adufloat_decoder = {
+    .name           = "mp3adufloat",
+    .long_name      = NULL_IF_CONFIG_SMALL("ADU (Application Data Unit) MP3 (MPEG audio layer 3)"),
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_MP3ADU,
+    .priv_data_size = sizeof(MPADecodeContext),
+    .init           = decode_init,
+    .close          = decode_close,
+    .decode         = decode_frame_adu,
+    .capabilities   = AV_CODEC_CAP_DR1,
+    .flush          = flush,
+    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+                                                      AV_SAMPLE_FMT_FLT,
+                                                      AV_SAMPLE_FMT_NONE },
+};
+#endif
+#if CONFIG_MP3ON4FLOAT_DECODER
+AVCodec ff_mp3on4float_decoder = {
+    .name           = "mp3on4float",
+    .long_name      = NULL_IF_CONFIG_SMALL("MP3onMP4"),
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_MP3ON4,
+    .priv_data_size = sizeof(MP3On4DecodeContext),
+    .init           = decode_init_mp3on4,
+    .close          = decode_close_mp3on4,
+    .decode         = decode_frame_mp3on4,
+    .capabilities   = AV_CODEC_CAP_DR1,
+    .flush          = flush_mp3on4,
+    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
+                                                      AV_SAMPLE_FMT_NONE },
+};
+#endif