[alsa-devel] [PATCH 05/35] axfer: add support for a container of Sparc AU format
Takashi Sakamoto
o-takashi at sakamocchi.jp
Tue Nov 13 07:41:17 CET 2018
This commit adds support for data of Sparc AU format. In this data format,
values in each of field are encoded in big-endian byte order and available
formats of data sample are restricted in big-endian byte order.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
axfer/Makefile.am | 3 +-
axfer/container-au.c | 203 +++++++++++++++++++++++++++++++++++++++++++
axfer/container.c | 6 +-
axfer/container.h | 4 +
4 files changed, 214 insertions(+), 2 deletions(-)
create mode 100644 axfer/container-au.c
diff --git a/axfer/Makefile.am b/axfer/Makefile.am
index 092c966..35aa226 100644
--- a/axfer/Makefile.am
+++ b/axfer/Makefile.am
@@ -25,4 +25,5 @@ axfer_SOURCES = \
subcmd-list.c \
container.h \
container.c \
- container-riff-wave.c
+ container-riff-wave.c \
+ container-au.c
diff --git a/axfer/container-au.c b/axfer/container-au.c
new file mode 100644
index 00000000..6459b16
--- /dev/null
+++ b/axfer/container-au.c
@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// container-au.c - a parser/builder for a container of Sun Audio File.
+//
+// Copyright (c) 2018 Takashi Sakamoto <o-takashi at sakamocchi.jp>
+//
+// Licensed under the terms of the GNU General Public License, version 2.
+
+#include "container.h"
+#include "misc.h"
+
+// Not portable to all of UNIX platforms.
+#include <endian.h>
+
+// Reference:
+// * http://pubs.opengroup.org/external/auformat.html
+
+#define AU_MAGIC ".snd"
+#define UNKNOWN_SIZE UINT32_MAX
+
+enum code_id {
+ CODE_ID_CCIT_MU_LAW_BE = 0x01,
+ CODE_ID_GENERIC_MBLA_S8 = 0x02,
+ CODE_ID_GENERIC_MBLA_S16_BE = 0x03,
+ CODE_ID_GENERIC_MBLA_S32_BE = 0x05,
+ CODE_ID_IEEE754_FLOAT_S32_BE = 0x06,
+ CODE_ID_IEEE754_DOUBLE_S64_BE = 0x07,
+ CODE_ID_CCIT_ADPCM_G721_4BIT_BE = 0x17,
+ CODE_ID_CCIT_ADPCM_G723_3BIT_BE = 0x19,
+ CODE_ID_CCIT_A_LAW_BE = 0x1b,
+};
+
+struct format_map {
+ enum code_id code_id;
+ snd_pcm_format_t format;
+};
+
+static const struct format_map format_maps[] = {
+ {CODE_ID_GENERIC_MBLA_S8, SND_PCM_FORMAT_S8},
+ {CODE_ID_GENERIC_MBLA_S16_BE, SND_PCM_FORMAT_S16_BE},
+ {CODE_ID_GENERIC_MBLA_S32_BE, SND_PCM_FORMAT_S32_BE},
+ {CODE_ID_IEEE754_FLOAT_S32_BE, SND_PCM_FORMAT_FLOAT_BE},
+ {CODE_ID_IEEE754_DOUBLE_S64_BE, SND_PCM_FORMAT_FLOAT64_BE},
+ // CODE_ID_CCIT_ADPCM_G721_4BIT_BE is not supported by ALSA.
+ // CODE_ID_CCIT_ADPCM_G723_3BIT_BE is not supported due to width of
+ // its sample.
+ {CODE_ID_CCIT_A_LAW_BE, SND_PCM_FORMAT_A_LAW},
+ {CODE_ID_CCIT_MU_LAW_BE, SND_PCM_FORMAT_MU_LAW},
+};
+
+struct container_header {
+ uint8_t magic[4];
+ uint32_t hdr_size;
+ uint32_t data_size;
+ uint32_t code_id;
+ uint32_t frames_per_second;
+ uint32_t samples_per_frame;
+};
+
+struct container_annotation {
+ uint32_t chunks[0];
+};
+
+struct parser_state {
+ enum code_id code_id;
+ unsigned int samples_per_frame;
+ unsigned int bytes_per_sample;
+};
+
+static int au_parser_pre_process(struct container_context *cntr,
+ snd_pcm_format_t *format,
+ unsigned int *samples_per_frame,
+ unsigned int *frames_per_second,
+ uint64_t *byte_count)
+{
+ struct parser_state *state = cntr->private_data;
+ struct container_header header;
+ enum code_id code_id;
+ int i;
+ int err;
+
+ // Parse header. 4 bytes are enough to detect supported containers.
+ memcpy(&header.magic, cntr->magic, sizeof(cntr->magic));
+ err = container_recursive_read(cntr,
+ (char *)&header + sizeof(cntr->magic),
+ sizeof(header) - sizeof(cntr->magic));
+ if (err < 0)
+ return err;
+ if (cntr->eof)
+ return 0;
+
+ if (memcmp(header.magic, AU_MAGIC, sizeof(header.magic)) != 0)
+ return -EINVAL;
+ if (be32toh(header.hdr_size) != sizeof(struct container_header))
+ return -EINVAL;
+
+ code_id = be32toh(header.code_id);
+ for (i = 0; i < ARRAY_SIZE(format_maps); ++i) {
+ if (format_maps[i].code_id == code_id)
+ break;
+ }
+ if (i == ARRAY_SIZE(format_maps))
+ return -EINVAL;
+ *format = format_maps[i].format;
+ *frames_per_second = be32toh(header.frames_per_second);
+ *samples_per_frame = be32toh(header.samples_per_frame);
+
+ state->code_id = code_id;
+ state->samples_per_frame = *samples_per_frame;
+ state->bytes_per_sample = snd_pcm_format_physical_width(*format) / 8;
+
+ *byte_count = be32toh(header.data_size);
+
+ return 0;
+}
+
+struct builder_state {
+ unsigned int bytes_per_sample;
+ unsigned int samples_per_frame;
+ unsigned int frames_per_second;
+ enum code_id code_id;
+};
+
+static void build_container_header(struct builder_state *state,
+ struct container_header *header,
+ unsigned int frames_per_second,
+ uint64_t byte_count)
+{
+ memcpy(header->magic, AU_MAGIC, sizeof(header->magic));
+ header->hdr_size = htobe32(sizeof(struct container_header));
+ header->data_size = htobe32(byte_count);
+ header->code_id = htobe32(state->code_id);
+ header->frames_per_second = htobe32(frames_per_second);
+ header->samples_per_frame = htobe32(state->samples_per_frame);
+}
+
+static int write_container_header(struct container_context *cntr,
+ uint64_t byte_count)
+{
+ struct builder_state *state = cntr->private_data;
+ struct container_header header;
+
+ build_container_header(state, &header, state->frames_per_second,
+ byte_count);
+
+ return container_recursive_write(cntr, &header, sizeof(header));
+}
+
+static int au_builder_pre_process(struct container_context *cntr,
+ snd_pcm_format_t *format,
+ unsigned int *samples_per_frame,
+ unsigned int *frames_per_second,
+ uint64_t *byte_count)
+{
+ struct builder_state *status = cntr->private_data;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(format_maps); ++i) {
+ if (format_maps[i].format == *format)
+ break;
+ }
+ if (i == ARRAY_SIZE(format_maps))
+ return -EINVAL;
+
+ status->code_id = format_maps[i].code_id;
+ status->bytes_per_sample = snd_pcm_format_physical_width(*format) / 8;
+ status->frames_per_second = *frames_per_second;
+ status->samples_per_frame = *samples_per_frame;
+
+ return write_container_header(cntr, *byte_count);
+}
+
+static int au_builder_post_process(struct container_context *cntr,
+ uint64_t handled_byte_count)
+{
+ int err;
+
+ err = container_seek_offset(cntr, 0);
+ if (err < 0)
+ return err;
+
+ return write_container_header(cntr, handled_byte_count);
+}
+
+const struct container_parser container_parser_au = {
+ .format = CONTAINER_FORMAT_AU,
+ .magic = AU_MAGIC,
+ .max_size = UINT32_MAX,
+ .ops = {
+ .pre_process = au_parser_pre_process,
+ },
+ .private_size = sizeof(struct parser_state),
+};
+
+const struct container_builder container_builder_au = {
+ .format = CONTAINER_FORMAT_AU,
+ .max_size = UINT32_MAX,
+ .ops = {
+ .pre_process = au_builder_pre_process,
+ .post_process = au_builder_post_process,
+ },
+ .private_size = sizeof(struct builder_state),
+};
diff --git a/axfer/container.c b/axfer/container.c
index 04042da..0e25605 100644
--- a/axfer/container.c
+++ b/axfer/container.c
@@ -21,10 +21,12 @@ static const char *const cntr_type_labels[] = {
static const char *const cntr_format_labels[] = {
[CONTAINER_FORMAT_RIFF_WAVE] = "riff/wave",
+ [CONTAINER_FORMAT_AU] = "au",
};
static const char *const suffixes[] = {
- [CONTAINER_FORMAT_RIFF_WAVE] = ".wav",
+ [CONTAINER_FORMAT_RIFF_WAVE] = ".wav",
+ [CONTAINER_FORMAT_AU] = ".au",
};
@@ -142,6 +144,7 @@ int container_parser_init(struct container_context *cntr,
{
const struct container_parser *parsers[] = {
[CONTAINER_FORMAT_RIFF_WAVE] = &container_parser_riff_wave,
+ [CONTAINER_FORMAT_AU] = &container_parser_au,
};
const struct container_parser *parser;
unsigned int size;
@@ -216,6 +219,7 @@ int container_builder_init(struct container_context *cntr,
{
const struct container_builder *builders[] = {
[CONTAINER_FORMAT_RIFF_WAVE] = &container_builder_riff_wave,
+ [CONTAINER_FORMAT_AU] = &container_builder_au,
};
const struct container_builder *builder;
int err;
diff --git a/axfer/container.h b/axfer/container.h
index 5808933..19ef672 100644
--- a/axfer/container.h
+++ b/axfer/container.h
@@ -26,6 +26,7 @@ enum container_type {
enum container_format {
CONTAINER_FORMAT_RIFF_WAVE = 0,
+ CONTAINER_FORMAT_AU,
CONTAINER_FORMAT_COUNT,
};
@@ -111,4 +112,7 @@ int container_seek_offset(struct container_context *cntr, off64_t offset);
extern const struct container_parser container_parser_riff_wave;
extern const struct container_builder container_builder_riff_wave;
+extern const struct container_parser container_parser_au;
+extern const struct container_builder container_builder_au;
+
#endif
--
2.19.1
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