/**
* Opens the input file/url, allocates a AVFormatContext for it and opens the audio stream with an
* appropriate decoder.
*
* @param env JNIEnv
* @param format_context AVFormatContext
* @param openedStream opened audio AVStream
* @param stream_index[in] index of the desired <em>audio</em> stream
* @param stream_index[out] index of the selected stream (index of <em>all</em> streams)
* @param url URL to open
* @return negative value, if something went wrong
*/
int ff_open_file(JNIEnv *env, AVFormatContext **format_context, AVStream **openedStream, AVCodecContext **context, int *stream_index, const char *url) {
int res = 0;
res = ff_open_format_context(env, format_context, url);
if (res) {
// exception has already been thrown
goto bail;
}
#ifdef DEBUG
fprintf(stderr, "Desired audio stream index: %i.\n", *stream_index);
#endif
if (*stream_index < 0) {
// use best audio stream
res = open_codec_context(stream_index, *format_context, *context, AVMEDIA_TYPE_AUDIO);
if (res) {
throwUnsupportedAudioFileExceptionIfError(env, res, "Failed to open codec context.");
goto bail;
}
*openedStream = (*format_context)->streams[*stream_index];
} else {
// find xth audio stream
// count possible audio streams
int i;
int audio_stream_number = 0;
AVStream* stream = NULL;
AVFormatContext* deref_format_context = *format_context;
for (i=0; i<deref_format_context->nb_streams; i++) {
stream = deref_format_context->streams[i];
if (stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
if (audio_stream_number == *stream_index) {
*stream_index = i;
#ifdef DEBUG
fprintf(stderr, "Found desired audio stream at index: %i.\n", i);
#endif
break;
}
audio_stream_number++;
}
stream = NULL;
}
if (stream == NULL) {
// we didn't find a stream with the given index
res = -1;
throwIndexOutOfBoundsExceptionIfError(env, res, *stream_index);
goto bail;
}
res = ff_open_stream(env, stream, context);
if (res) {
goto bail;
}
*openedStream = stream;
}
#ifdef DEBUG
fprintf(stderr, "Opened stream index: %i.\n", *stream_index);
fprintf(stderr, "Opened stream: %ld.\n", (long) *openedStream);
#endif
bail:
return res;
}
static int create_ffaudiofileformats(JNIEnv *env, AVFormatContext *format_context, jobjectArray *array, jstring url) {
int res = 0;
jlong duration_in_microseconds = -1;
jfloat frame_rate = -1;
jobject vbr = NULL;
jboolean big_endian = 1;
jobject audio_format = NULL;
jint frame_size = -1;
jint sample_size = 0;
int audio_stream_count = 0;
int audio_stream_number = 0;
// count possible audio streams
int i;
for (i=0; i<format_context->nb_streams; i++) {
AVStream* stream = format_context->streams[i];
if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
audio_stream_count++;
}
}
#ifdef DEBUG
fprintf(stderr, "Found %i audio streams.\n", audio_stream_count);
#endif
// create output array
*array = (*env)->NewObjectArray(env, audio_stream_count, (*env)->FindClass(env, "javax/sound/sampled/AudioFileFormat"), NULL);
if (array == NULL) {
goto bail;
}
#ifdef DEBUG
fprintf(stderr, "Created audio file format array.\n");
#endif
// iterate over audio streams
for (i=0; i<format_context->nb_streams; i++) {
AVStream* stream = format_context->streams[i];
if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
res = ff_open_stream(env, stream);
if (res) {
goto bail;
}
// create object
duration_in_microseconds = duration(format_context, stream);
frame_rate = get_frame_rate(stream, duration_in_microseconds);
big_endian = ff_big_endian(stream->codec->codec_id);
if (is_pcm(stream->codec->codec_id)) {
frame_size = (stream->codec->bits_per_coded_sample / 8) * stream->codec->channels;
}
// TODO: Support VBR.
sample_size = stream->codec->bits_per_coded_sample
? stream->codec->bits_per_coded_sample
: stream->codec->bits_per_raw_sample;
#ifdef DEBUG
fprintf(stderr, "stream->codec->bits_per_coded_sample: %i\n", stream->codec->bits_per_coded_sample);
fprintf(stderr, "stream->codec->bits_per_raw_sample : %i\n", stream->codec->bits_per_raw_sample);
fprintf(stderr, "stream->codec->bit_rate : %i\n", stream->codec->bit_rate);
fprintf(stderr, "format_context->packet_size : %i\n", format_context->packet_size);
fprintf(stderr, "frames : %" PRId64 "\n", stream->nb_frames);
fprintf(stderr, "sample_rate: %i\n", stream->codec->sample_rate);
fprintf(stderr, "sampleSize : %i\n", stream->codec->bits_per_coded_sample);
fprintf(stderr, "channels : %i\n", stream->codec->channels);
fprintf(stderr, "frame_size : %i\n", (int)frame_size);
fprintf(stderr, "codec_id : %i\n", stream->codec->codec_id);
fprintf(stderr, "duration : %" PRId64 "\n", (int64_t)duration_in_microseconds);
fprintf(stderr, "frame_rate : %f\n", frame_rate);
if (big_endian) {
fprintf(stderr, "big_endian : true\n");
} else {
fprintf(stderr, "big_endian : false\n");
}
#endif
audio_format = create_ffaudiofileformat(env, url,
stream->codec->codec_id,
(jfloat)stream->codec->sample_rate,
sample_size,
stream->codec->channels,
frame_size,
frame_rate,
big_endian,
duration_in_microseconds,
stream->codec->bit_rate,
vbr);
(*env)->SetObjectArrayElement(env, *array, audio_stream_number, audio_format);
audio_stream_number++;
// clean up
if (stream && stream->codec) {
avcodec_close(stream->codec);
}
}
}
bail:
return res;
}