avformat: add DFPWM raw format

This patch builds on my previous DFPWM codec patch, adding a raw
audio format to be able to read/write the raw files that are most commonly
used (as no other container format supports it yet).

The muxers are mostly copied from the PCM demuxer and the raw muxers, as
DFPWM is typically stored as raw data.

Please see the previous patch for more information on DFPWM.

Signed-off-by: Jack Bruienne <jackbruienne@gmail.com>

Changelog

@@ -5,7 +5,7 @@ version 5.1:
 - dialogue enhance audio filter
 - dropped obsolete XvMC hwaccel
 - pcm-bluray encoder
-- DFPWM audio encoder/decoder
+- DFPWM audio encoder/decoder and raw muxer/demuxer
 
 
 version 5.0:

MAINTAINERS

@@ -416,6 +416,7 @@ Muxers/Demuxers:
   dashdec.c                             Steven Liu
   dashenc.c                             Karthick Jeyapal
   daud.c                                Reimar Doeffinger
+  dfpwmdec.c                            Jack Bruienne
   dss.c                                 Oleksij Rempel
   dtsdec.c                              foo86
   dtshddec.c                            Paul B Mahol

doc/general_contents.texi

@@ -578,6 +578,7 @@ library:
 @item raw aptX                  @tab X @tab X
 @item raw aptX HD               @tab X @tab X
 @item raw Chinese AVS video     @tab X @tab X
+@item raw DFPWM                 @tab X @tab X
 @item raw Dirac                 @tab X @tab X
 @item raw DNxHD                 @tab X @tab X
 @item raw DTS                   @tab X @tab X

libavformat/Makefile

@@ -166,6 +166,8 @@ OBJS-$(CONFIG_DAUD_MUXER)                += daudenc.o
 OBJS-$(CONFIG_DCSTR_DEMUXER)             += dcstr.o
 OBJS-$(CONFIG_DERF_DEMUXER)              += derf.o pcm.o
 OBJS-$(CONFIG_DFA_DEMUXER)               += dfa.o
+OBJS-$(CONFIG_DFPWM_DEMUXER)             += dfpwmdec.o pcm.o
+OBJS-$(CONFIG_DFPWM_MUXER)               += rawenc.o
 OBJS-$(CONFIG_DHAV_DEMUXER)              += dhav.o
 OBJS-$(CONFIG_DIRAC_DEMUXER)             += diracdec.o rawdec.o
 OBJS-$(CONFIG_DIRAC_MUXER)               += rawenc.o

libavformat/allformats.c

@@ -124,6 +124,8 @@ extern const AVOutputFormat ff_daud_muxer;
 extern const AVInputFormat  ff_dcstr_demuxer;
 extern const AVInputFormat  ff_derf_demuxer;
 extern const AVInputFormat  ff_dfa_demuxer;
+extern const AVInputFormat  ff_dfpwm_demuxer;
+extern const AVOutputFormat ff_dfpwm_muxer;
 extern const AVInputFormat  ff_dhav_demuxer;
 extern const AVInputFormat  ff_dirac_demuxer;
 extern const AVOutputFormat ff_dirac_muxer;

libavformat/dfpwmdec.c

@@ -0,0 +1,82 @@
+/*
+ * RAW PCM demuxers
+ * Copyright (c) 2002 Fabrice Bellard
+ * Copyright (c) 2022 Jack Bruienne
+ *
+ * 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 "libavutil/avstring.h"
+#include "avformat.h"
+#include "internal.h"
+#include "pcm.h"
+#include "libavutil/log.h"
+#include "libavutil/opt.h"
+#include "libavutil/avassert.h"
+
+typedef struct DFPWMAudioDemuxerContext {
+    AVClass *class;
+    int sample_rate;
+    int channels;
+} DFPWMAudioDemuxerContext;
+
+static int dfpwm_read_header(AVFormatContext *s)
+{
+    DFPWMAudioDemuxerContext *s1 = s->priv_data;
+    AVCodecParameters *par;
+    AVStream *st;
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    par = st->codecpar;
+
+    par->codec_type  = AVMEDIA_TYPE_AUDIO;
+    par->codec_id    = s->iformat->raw_codec_id;
+    par->sample_rate = s1->sample_rate;
+    par->channels    = s1->channels;
+    par->bits_per_coded_sample = 1;
+    par->block_align = 1;
+
+    avpriv_set_pts_info(st, 64, 1, par->sample_rate);
+    return 0;
+}
+
+static const AVOption dfpwm_options[] = {
+    { "sample_rate", "", offsetof(DFPWMAudioDemuxerContext, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
+    { "channels",    "", offsetof(DFPWMAudioDemuxerContext, channels),    AV_OPT_TYPE_INT, {.i64 = 1}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
+    { NULL },
+};
+static const AVClass dfpwm_demuxer_class = {
+    .class_name = "dfpwm demuxer",
+    .item_name  = av_default_item_name,
+    .option     = dfpwm_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+const AVInputFormat ff_dfpwm_demuxer = {
+    .name           = "dfpwm",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw DFPWM1a"),
+    .priv_data_size = sizeof(DFPWMAudioDemuxerContext),
+    .read_header    = dfpwm_read_header,
+    .read_packet    = ff_pcm_read_packet,
+    .read_seek      = ff_pcm_read_seek,
+    .flags          = AVFMT_GENERIC_INDEX,
+    .extensions     = "dfpwm",
+    .raw_codec_id   = AV_CODEC_ID_DFPWM,
+    .priv_class     = &dfpwm_demuxer_class,
+};

libavformat/rawenc.c

@@ -192,6 +192,19 @@ const AVOutputFormat ff_data_muxer = {
 };
 #endif
 
+#if CONFIG_DFPWM_MUXER
+const AVOutputFormat ff_dfpwm_muxer = {
+    .name              = "dfpwm",
+    .long_name         = NULL_IF_CONFIG_SMALL("raw DFPWM1a"),
+    .extensions        = "dfpwm",
+    .audio_codec       = AV_CODEC_ID_DFPWM,
+    .video_codec       = AV_CODEC_ID_NONE,
+    .init              = force_one_stream,
+    .write_packet      = ff_raw_write_packet,
+    .flags             = AVFMT_NOTIMESTAMPS,
+};
+#endif
+
 #if CONFIG_DIRAC_MUXER
 const AVOutputFormat ff_dirac_muxer = {
     .name              = "dirac",

libavformat/version.h

@@ -32,8 +32,8 @@
 // Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
 // Also please add any ticket numbers that you believe might be affected here
 #define LIBAVFORMAT_VERSION_MAJOR  59
-#define LIBAVFORMAT_VERSION_MINOR  17
-#define LIBAVFORMAT_VERSION_MICRO 103
+#define LIBAVFORMAT_VERSION_MINOR  18
+#define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \