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ffmpeg second api

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This commit is contained in:
Hans Dijkema
2026-04-26 11:49:42 +02:00
parent 38bc2445e1
commit 1a8646fd8b
3 changed files with 694 additions and 525 deletions
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ffmpeg-audio/demo_ffmpeg_audio.c
+86 -61
View File
@@ -3,7 +3,6 @@
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef WIN32
#define fprintf fprintf_s
@@ -26,18 +25,18 @@ static int write_wav_header(FILE *f,
int channels,
int bits_per_sample,
uint32_t data_size) {
uint32_t byte_rate =
const uint32_t byte_rate =
(uint32_t)(sample_rate * channels * bits_per_sample / 8);
uint16_t block_align =
const uint16_t block_align =
(uint16_t)(channels * bits_per_sample / 8);
fwrite("RIFF", 1, 4, f);
write_u32_le(f, 36 + data_size);
write_u32_le(f, 36u + data_size);
fwrite("WAVE", 1, 4, f);
fwrite("fmt ", 1, 4, f);
write_u32_le(f, 16); /* fmt chunk size */
write_u16_le(f, 1); /* PCM */
write_u16_le(f, 1); /* 1 = integer PCM */
write_u16_le(f, (uint16_t)channels);
write_u32_le(f, (uint32_t)sample_rate);
write_u32_le(f, byte_rate);
@@ -66,16 +65,37 @@ static int rewrite_wav_header(FILE *f,
data_size);
}
static int write_decoder_buffer(FILE *out,
fmpg_decoder *dec,
uint64_t *total_written) {
const uint8_t *buf = fmpg_decoder_buffer(dec);
const int size = fmpg_decoder_buffer_size(dec);
if (!buf || size <= 0) {
return 1;
}
if (fwrite(buf, 1, (size_t)size, out) != (size_t)size) {
return 0;
}
*total_written += (uint64_t)size;
return 1;
}
int main(int argc, char **argv) {
const char *infile;
const char *outfile;
fmpg_instance * ac = NULL;
fmpg_decoder * dec = NULL;
fmpg_instance *ac = NULL;
fmpg_decoder *dec = NULL;
FILE *out = NULL;
int stream;
fmpg_audio_info info;
int sample_rate;
int channels;
int bits_per_sample;
int64_t duration_ms;
int64_t duration_samples;
uint64_t total_written = 0;
if (argc != 3) {
@@ -86,44 +106,42 @@ int main(int argc, char **argv) {
infile = argv[1];
outfile = argv[2];
ac = ac_init();
ac = fmpg_init();
if (!ac) {
fprintf(stderr, "ac_init failed\n");
return 1;
}
if (!ac_open_file(ac, infile)) {
if (!fmpg_open_file(ac, infile)) {
fprintf(stderr, "could not open input file: %s\n", infile);
ac_free(ac);
fmpg_free(ac);
return 1;
}
stream = ac_get_default_audio_stream(ac);
if (stream < 0) {
fprintf(stderr, "no audio stream found\n");
ac_free(ac);
sample_rate = fmpg_audio_sample_rate(ac);
channels = fmpg_audio_channels(ac);
bits_per_sample = fmpg_audio_bits_per_sample(ac);
duration_ms = fmpg_duration_ms(ac);
duration_samples = fmpg_duration_samples(ac);
if (sample_rate <= 0 || channels <= 0 || bits_per_sample != 32) {
fprintf(stderr, "invalid audio parameters\n");
fmpg_free(ac);
return 1;
}
memset(&info, 0, sizeof(info));
if (!ac_get_audio_info(ac, stream, &info)) {
fprintf(stderr, "could not get audio info\n");
ac_free(ac);
return 1;
}
dec = ac_create_decoder(ac, stream);
dec = fmpg_create_decoder(ac);
if (!dec) {
fprintf(stderr, "could not create decoder\n");
ac_free(ac);
fmpg_free(ac);
return 1;
}
out = fopen(outfile, "wb");
if (!out) {
fprintf(stderr, "could not open output file: %s\n", outfile);
ac_free_decoder(dec);
ac_free(ac);
fmpg_free_decoder(dec);
fmpg_free(ac);
return 1;
}
@@ -132,49 +150,50 @@ int main(int argc, char **argv) {
* Write a placeholder header first and patch it at the end.
*/
if (!write_wav_header(out,
info.sample_rate,
info.channels,
32,
sample_rate,
channels,
bits_per_sample,
0)) {
fprintf(stderr, "could not write WAV header\n");
fclose(out);
ac_free_decoder(dec);
ac_free(ac);
fmpg_free_decoder(dec);
fmpg_free(ac);
return 1;
}
for (;;) {
fmpg_package * pkg = ac_read_package(ac);
fmpg_package *pkg = fmpg_read_package(ac);
if (!pkg) {
break;
}
if (ac_package_stream_index(pkg) == stream) {
if (ac_decode_package(pkg, dec)) {
const uint8_t *buf = ac_decoder_buffer(dec);
int size = ac_decoder_buffer_size(dec);
if (buf && size > 0) {
fwrite(buf, 1, (size_t)size, out);
total_written += (uint64_t)size;
}
/*
* ac_read_package() now returns only packets from the internally
* selected audio stream. No stream_index test is needed anymore.
*/
if (fmpg_decode_package(pkg, dec)) {
if (!write_decoder_buffer(out, dec, &total_written)) {
fprintf(stderr, "could not write PCM data\n");
fmpg_free_package(pkg);
fclose(out);
fmpg_free_decoder(dec);
fmpg_free(ac);
return 1;
}
}
ac_free_package(pkg);
fmpg_free_package(pkg);
}
/*
* Drain delayed samples from the decoder and resampler.
*/
while (ac_flush_decoder(dec)) {
const uint8_t *buf = ac_decoder_buffer(dec);
int size = ac_decoder_buffer_size(dec);
if (buf && size > 0) {
fwrite(buf, 1, (size_t)size, out);
total_written += (uint64_t)size;
/* Drain delayed samples from the decoder and resampler. */
while (fmpg_flush_decoder(dec)) {
if (!write_decoder_buffer(out, dec, &total_written)) {
fprintf(stderr, "could not write flushed PCM data\n");
fclose(out);
fmpg_free_decoder(dec);
fmpg_free(ac);
return 1;
}
}
@@ -185,23 +204,29 @@ int main(int argc, char **argv) {
}
if (!rewrite_wav_header(out,
info.sample_rate,
info.channels,
32,
sample_rate,
channels,
bits_per_sample,
(uint32_t)total_written)) {
fprintf(stderr, "could not rewrite WAV header\n");
}
fclose(out);
ac_free_decoder(dec);
ac_free(ac);
printf("wrote %s\n", outfile);
printf("sample rate: %d\n", info.sample_rate);
printf("channels: %d\n", info.channels);
printf("sample bits: %d\n", 32);
printf("title: %s\n", fmpg_file_title(ac));
printf("album: %s\n", fmpg_file_album(ac));
printf("sample rate: %d\n", sample_rate);
printf("channels: %d\n", channels);
printf("sample bits: %d\n", bits_per_sample);
printf("duration ms: %lld\n", (long long)duration_ms);
printf("duration smp:%lld\n", (long long)duration_samples);
printf("decoded smp: %lld\n", (long long)fmpg_decoder_sample_position(dec));
printf("data bytes: %llu\n",
(unsigned long long)total_written);
fmpg_free_decoder(dec);
fmpg_free(ac);
return 0;
}