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spdif-loop.c
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spdif-loop.c
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#define _GNU_SOURCE
#include <math.h>
#include <stdio.h>
#include <unistd.h>
#include <err.h>
#include <getopt.h>
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libavdevice/avdevice.h>
#include <ao/ao.h>
#include <libavformat/avio.h>
#include "resample.h"
#include "helper.h"
#include "myspdif.h"
#include "codechandler.h"
#define IO_BUFFER_SIZE ((8 + 1792 + 4344) * 1)
struct alsa_read_state
{
AVFormatContext *ctx;
AVPacket pkt;
int offset;
};
static int debug_data;
static void
usage(void)
{
fprintf(stderr,
"usage:\n"
" spdif-loop [-t | -i <hw:alsa-input-dev>] -d <alsa|pulse> -o <surround-output-dev> [-p <stereo-passthrough-dev>]\n");
exit(1);
}
static int
alsa_reader(void *data, uint8_t *buf, int buf_size)
{
struct alsa_read_state *st = data;
int read_size = 0;
while (buf_size > 0)
{
if (st->pkt.size <= 0)
{
int ret = av_read_frame(st->ctx, &st->pkt);
st->offset = 0;
if (ret != 0)
return (ret);
}
int pkt_left = st->pkt.size - st->offset;
int datsize = buf_size < pkt_left ? buf_size : pkt_left;
memcpy(buf, st->pkt.data + st->offset, datsize);
st->offset += datsize;
read_size += datsize;
buf += datsize;
buf_size -= datsize;
if (debug_data)
{
static int had_zeros = 0;
int i;
for (i = 0; i < read_size; ++i)
{
const char zeros[16] = {0};
if (i % 16 == 0 && read_size - i >= 16 &&
memcmp((char *)buf + i, zeros, 16) == 0)
{
i += 15;
if (had_zeros && had_zeros % 10000 == 0)
printf(" (%d)\n", had_zeros * 16);
if (!had_zeros)
printf("...\n");
had_zeros++;
continue;
}
if (had_zeros)
printf(" (%d)\n", had_zeros * 16);
had_zeros = 0;
printf("%02x%s", ((unsigned char *)buf)[i],
(i + 1) % 16 == 0 ? "\n" : " ");
}
}
if (st->offset >= st->pkt.size)
av_free_packet(&st->pkt);
}
return (read_size);
}
int main(int argc, char **argv)
{
int opt_test = 0;
char *alsa_dev_name = NULL;
char *out_driver_name = NULL;
char *out_dev_name = NULL;
char *out_dev_passthrough_name = NULL;
int opt;
for (opt = 0; (opt = getopt(argc, argv, "d:hi:o:p:tv")) != -1;)
{
switch (opt)
{
case 'd':
out_driver_name = optarg;
break;
case 'i':
alsa_dev_name = optarg;
break;
case 'o':
out_dev_name = optarg;
break;
case 'p':
out_dev_passthrough_name = optarg;
break;
case 't':
opt_test = 1;
break;
case 'v':
debug_data = 1;
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc != 0)
usage();
if (!(opt_test ^ !!alsa_dev_name))
{
fprintf(stderr, "please specify either input device or testing mode\n\n");
usage();
}
av_register_all();
avcodec_register_all();
avdevice_register_all();
ao_initialize();
ao_option *out_dev_opts = NULL;
if (out_dev_name)
{
if (!ao_append_option(&out_dev_opts, "dev", out_dev_name))
errx(1, "cannot set output device `%s'", out_dev_name);
}
ao_option *out_dev_passthrough_opts = NULL;
if (out_dev_passthrough_name)
{
if (!ao_append_option(&out_dev_passthrough_opts, "dev", out_dev_passthrough_name))
errx(1, "cannot set passthrough device `%s'", out_dev_passthrough_name);
}
int out_driver_id = ao_default_driver_id();
if (out_driver_name)
out_driver_id = ao_driver_id(out_driver_name);
if (out_driver_id < 0)
errx(1, "invalid output driver `%s'",
out_driver_name ? out_driver_name : "default");
if (opt_test)
{
exit(test_audio_out(out_driver_id, out_dev_opts));
// NOTREACHED
}
AVInputFormat *alsa_fmt = av_find_input_format("alsa");
if (!alsa_fmt)
errx(1, "cannot find alsa input driver");
AVInputFormat *spdif_fmt = av_find_input_format("spdif");
if (!spdif_fmt)
errx(1, "cannot find S/PDIF demux driver");
const int alsa_buf_size = IO_BUFFER_SIZE;
unsigned char *alsa_buf = av_malloc(alsa_buf_size);
if (!alsa_buf)
errx(1, "cannot allocate input buffer");
AVFormatContext *spdif_ctx = NULL;
AVFormatContext *alsa_ctx = NULL;
ao_device *out_dev = NULL;
uint8_t *audio_frame_data_pu8 = malloc(1 * 1024 * 1024);
uint32_t audio_frame_size_pu32 = 0;
if (0)
{
retry:
if (spdif_ctx)
avformat_close_input(&spdif_ctx);
if (alsa_ctx)
avformat_close_input(&alsa_ctx);
if (out_dev)
{
ao_close(out_dev);
out_dev = NULL;
}
sleep(1);
printf("retrying.\n");
}
spdif_ctx = avformat_alloc_context();
if (!spdif_ctx)
errx(1, "cannot allocate S/PDIF context");
if (avformat_open_input(&alsa_ctx, alsa_dev_name, alsa_fmt, NULL) != 0)
errx(1, "cannot open alsa input");
struct alsa_read_state read_state = {
.ctx = alsa_ctx,
};
av_init_packet(&read_state.pkt);
AVIOContext *avio_ctx = avio_alloc_context(alsa_buf, alsa_buf_size, 0, &read_state, alsa_reader, NULL, NULL);
if (!avio_ctx)
{
errx(1, "cannot open avio_alloc_context");
}
spdif_ctx->pb = avio_alloc_context(alsa_buf, alsa_buf_size, 0, &read_state, alsa_reader, NULL, NULL);
if (!spdif_ctx->pb)
errx(1, "cannot set up alsa reader");
if (avformat_open_input(&spdif_ctx, "internal", spdif_fmt, NULL) != 0)
errx(1, "cannot open S/PDIF input");
av_dump_format(alsa_ctx, 0, alsa_dev_name, 0);
AVPacket pkt = {.size = 0, .data = NULL};
av_init_packet(&pkt);
CodecHandler codec_handler_st;
CodecHandler_init(&codec_handler_st);
printf("start loop\n");
while (1)
{
// Read data from the SPDIF stream
int r = my_spdif_read_packet(spdif_ctx, &pkt, audio_frame_data_pu8, IO_BUFFER_SIZE, &audio_frame_size_pu32);
// If the read returns zero, it means a codec was found and the audio can be played from the packet
if (r == 0)
{
if (CodecHandler_loadCodec(&codec_handler_st, spdif_ctx) != 0)
{
printf("Could not load codec %s.\n", avcodec_get_name(codec_handler_st.currentCodecID));
goto retry;
}
if (CodecHandler_decodeCodec(&codec_handler_st, &pkt, audio_frame_data_pu8, &audio_frame_size_pu32) == 1)
{
// Force the output device to re-initialize on the next audio frame, in order to match the new codec parameters
if (out_dev)
{
ao_close(out_dev);
out_dev = NULL;
}
printf("Detected S/PDIF codec %s\n", avcodec_get_name(codec_handler_st.currentCodecID));
}
if (pkt.size != 0)
{
// This is generally a packet error. All data contained in the packet sould have been decoded
printf("still some bytes left %d\n", pkt.size);
}
}
else // The data read from the stream didn't have any header information, so we're going to assume its raw uncompressed stereo PCM data
{
if (codec_handler_st.currentCodecID != AV_CODEC_ID_NONE ||
codec_handler_st.currentChannelCount != 2 ||
codec_handler_st.currentSampleRate != 48000)
{
printf("Detected S/PDIF uncompressed audio\n");
// Force the output device to re-initialize on the next audio frame, in order to match the new codec parameters
if (out_dev)
{
ao_close(out_dev);
out_dev = NULL;
}
}
codec_handler_st.currentCodecID = AV_CODEC_ID_NONE;
codec_handler_st.currentChannelCount = 2;
codec_handler_st.currentSampleRate = 48000;
codec_handler_st.currentChannelLayout = 0;
}
// Initialize the output device
if (!out_dev)
{
if (out_dev_passthrough_opts && codec_handler_st.currentCodecID == AV_CODEC_ID_NONE)
{
printf("Using passthrough output device: %s\n", out_dev_passthrough_name);
out_dev = open_output(out_driver_id,
out_dev_passthrough_opts,
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) * 8,
codec_handler_st.currentChannelCount,
codec_handler_st.currentSampleRate);
}
else
{
printf("Using primary output device: %s\n", out_dev_name);
out_dev = open_output(out_driver_id,
out_dev_opts,
av_get_bytes_per_sample(AV_SAMPLE_FMT_S16) * 8,
codec_handler_st.currentChannelCount,
codec_handler_st.currentSampleRate);
}
if (!out_dev)
errx(1, "cannot open audio output");
}
// Play the audio frame
if (!ao_play(out_dev, audio_frame_data_pu8, audio_frame_size_pu32))
{
printf("Could not play audio to output device...");
goto retry;
}
}
CodecHandler_deinit(&codec_handler_st);
return (0);
}