avcodec: add pcm_f16le and pcm_f24le decoder

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Changelog

@@ -9,6 +9,8 @@ version <next>:
 - Support for spherical videos
 - configure now fails if autodetect-libraries are requested but not found
 - PSD Decoder
+- 16.8 floating point pcm decoder
+- 24.0 floating point pcm decoder
 
 version 3.2:
 - libopenmpt demuxer

libavcodec/Makefile

@@ -658,6 +658,8 @@ OBJS-$(CONFIG_PCM_ALAW_DECODER)           += pcm.o
 OBJS-$(CONFIG_PCM_ALAW_ENCODER)           += pcm.o
 OBJS-$(CONFIG_PCM_BLURAY_DECODER)         += pcm-bluray.o
 OBJS-$(CONFIG_PCM_DVD_DECODER)            += pcm-dvd.o
+OBJS-$(CONFIG_PCM_F16LE_DECODER)          += pcm.o
+OBJS-$(CONFIG_PCM_F24LE_DECODER)          += pcm.o
 OBJS-$(CONFIG_PCM_F32BE_DECODER)          += pcm.o
 OBJS-$(CONFIG_PCM_F32BE_ENCODER)          += pcm.o
 OBJS-$(CONFIG_PCM_F32LE_DECODER)          += pcm.o

libavcodec/allcodecs.c

@@ -477,6 +477,8 @@ void avcodec_register_all(void)
     REGISTER_ENCDEC (PCM_ALAW,          pcm_alaw);
     REGISTER_DECODER(PCM_BLURAY,        pcm_bluray);
     REGISTER_DECODER(PCM_DVD,           pcm_dvd);
+    REGISTER_DECODER(PCM_F16LE,         pcm_f16le);
+    REGISTER_DECODER(PCM_F24LE,         pcm_f24le);
     REGISTER_ENCDEC (PCM_F32BE,         pcm_f32be);
     REGISTER_ENCDEC (PCM_F32LE,         pcm_f32le);
     REGISTER_ENCDEC (PCM_F64BE,         pcm_f64be);

libavcodec/avcodec.h

@@ -449,6 +449,8 @@ enum AVCodecID {
 
     AV_CODEC_ID_PCM_S64LE = 0x10800,
     AV_CODEC_ID_PCM_S64BE,
+    AV_CODEC_ID_PCM_F16LE,
+    AV_CODEC_ID_PCM_F24LE,
 
     /* various ADPCM codecs */
     AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,

libavcodec/codec_desc.c

@@ -1748,6 +1748,20 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("PCM signed 20|24-bit big-endian"),
         .props     = AV_CODEC_PROP_LOSSLESS,
     },
+    {
+        .id        = AV_CODEC_ID_PCM_F16LE,
+        .type      = AVMEDIA_TYPE_AUDIO,
+        .name      = "pcm_f16le",
+        .long_name = NULL_IF_CONFIG_SMALL("PCM 16.8 floating point little-endian"),
+        .props     = AV_CODEC_PROP_LOSSLESS,
+    },
+    {
+        .id        = AV_CODEC_ID_PCM_F24LE,
+        .type      = AVMEDIA_TYPE_AUDIO,
+        .name      = "pcm_f24le",
+        .long_name = NULL_IF_CONFIG_SMALL("PCM 24.0 floating point little-endian"),
+        .props     = AV_CODEC_PROP_LOSSLESS,
+    },
     {
         .id        = AV_CODEC_ID_PCM_F32BE,
         .type      = AVMEDIA_TYPE_AUDIO,

libavcodec/pcm.c

@@ -25,6 +25,7 @@
  */
 
 #include "libavutil/attributes.h"
+#include "libavutil/float_dsp.h"
 #include "avcodec.h"
 #include "bytestream.h"
 #include "internal.h"
@@ -225,6 +226,8 @@ static int pcm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
 
 typedef struct PCMDecode {
     short   table[256];
+    AVFloatDSPContext *fdsp;
+    float   scale;
 } PCMDecode;
 
 static av_cold int pcm_decode_init(AVCodecContext *avctx)
@@ -246,6 +249,13 @@ static av_cold int pcm_decode_init(AVCodecContext *avctx)
         for (i = 0; i < 256; i++)
             s->table[i] = ulaw2linear(i);
         break;
+    case AV_CODEC_ID_PCM_F16LE:
+    case AV_CODEC_ID_PCM_F24LE:
+        s->scale = 1. / (1 << (avctx->bits_per_coded_sample - 1));
+        s->fdsp = avpriv_float_dsp_alloc(0);
+        if (!s->fdsp)
+            return AVERROR(ENOMEM);
+        break;
     default:
         break;
     }
@@ -258,6 +268,15 @@ static av_cold int pcm_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
+static av_cold int pcm_decode_close(AVCodecContext *avctx)
+{
+    PCMDecode *s = avctx->priv_data;
+
+    av_freep(&s->fdsp);
+
+    return 0;
+}
+
 /**
  * Read PCM samples macro
  * @param size   Data size of native machine format
@@ -400,6 +419,8 @@ static int pcm_decode_frame(AVCodecContext *avctx, void *data,
         break;
     case AV_CODEC_ID_PCM_S32LE:
     case AV_CODEC_ID_PCM_F32LE:
+    case AV_CODEC_ID_PCM_F24LE:
+    case AV_CODEC_ID_PCM_F16LE:
         DECODE(32, le32, src, samples, n, 0, 0)
         break;
     case AV_CODEC_ID_PCM_S32LE_PLANAR:
@@ -433,6 +454,8 @@ static int pcm_decode_frame(AVCodecContext *avctx, void *data,
         break;
     case AV_CODEC_ID_PCM_F64LE:
     case AV_CODEC_ID_PCM_F32LE:
+    case AV_CODEC_ID_PCM_F24LE:
+    case AV_CODEC_ID_PCM_F16LE:
     case AV_CODEC_ID_PCM_S64LE:
     case AV_CODEC_ID_PCM_S32LE:
     case AV_CODEC_ID_PCM_S16LE:
@@ -495,6 +518,14 @@ static int pcm_decode_frame(AVCodecContext *avctx, void *data,
         return -1;
     }
 
+    if (avctx->codec_id == AV_CODEC_ID_PCM_F16LE ||
+        avctx->codec_id == AV_CODEC_ID_PCM_F24LE) {
+        s->fdsp->vector_fmul_scalar((float *)frame->extended_data[0],
+                                    (const float *)frame->extended_data[0],
+                                    s->scale, FFALIGN(frame->nb_samples * avctx->channels, 4));
+        emms_c();
+    }
+
     *got_frame_ptr = 1;
 
     return buf_size;
@@ -530,6 +561,7 @@ AVCodec ff_ ## name_ ## _decoder = {                                        \
     .id             = AV_CODEC_ID_ ## id_,                                  \
     .priv_data_size = sizeof(PCMDecode),                                    \
     .init           = pcm_decode_init,                                      \
+    .close          = pcm_decode_close,                                     \
     .decode         = pcm_decode_frame,                                     \
     .capabilities   = AV_CODEC_CAP_DR1,                                     \
     .sample_fmts    = (const enum AVSampleFormat[]){ sample_fmt_,           \
@@ -549,6 +581,8 @@ AVCodec ff_ ## name_ ## _decoder = {                                        \
 
 /* Note: Do not forget to add new entries to the Makefile as well. */
 PCM_CODEC  (PCM_ALAW,         AV_SAMPLE_FMT_S16, pcm_alaw,         "PCM A-law / G.711 A-law");
+PCM_DECODER(PCM_F16LE,        AV_SAMPLE_FMT_FLT, pcm_f16le,        "PCM 16.8 floating point little-endian");
+PCM_DECODER(PCM_F24LE,        AV_SAMPLE_FMT_FLT, pcm_f24le,        "PCM 24.0 floating point little-endian");
 PCM_CODEC  (PCM_F32BE,        AV_SAMPLE_FMT_FLT, pcm_f32be,        "PCM 32-bit floating point big-endian");
 PCM_CODEC  (PCM_F32LE,        AV_SAMPLE_FMT_FLT, pcm_f32le,        "PCM 32-bit floating point little-endian");
 PCM_CODEC  (PCM_F64BE,        AV_SAMPLE_FMT_DBL, pcm_f64be,        "PCM 64-bit floating point big-endian");

libavcodec/utils.c

@@ -3500,6 +3500,8 @@ int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
     case AV_CODEC_ID_PCM_U32LE:
     case AV_CODEC_ID_PCM_F32BE:
     case AV_CODEC_ID_PCM_F32LE:
+    case AV_CODEC_ID_PCM_F24LE:
+    case AV_CODEC_ID_PCM_F16LE:
         return 32;
     case AV_CODEC_ID_PCM_F64BE:
     case AV_CODEC_ID_PCM_F64LE:

libavcodec/version.h

@@ -28,7 +28,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR  57
-#define LIBAVCODEC_VERSION_MINOR  68
+#define LIBAVCODEC_VERSION_MINOR  69
 #define LIBAVCODEC_VERSION_MICRO 100
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \