From fb1ddcdc8f51b9d261ae8e9c26b91e81f7b6bf45 Mon Sep 17 00:00:00 2001 From: Luca Barbato Date: Sun, 25 May 2014 17:49:15 +0200 Subject: avresample: Introduce AVFrame-based API --- libavresample/avresample.h | 69 ++++++++++++++++++++++++ libavresample/utils.c | 130 +++++++++++++++++++++++++++++++++++++++++++++ libavresample/version.h | 2 +- 3 files changed, 200 insertions(+), 1 deletion(-) (limited to 'libavresample') diff --git a/libavresample/avresample.h b/libavresample/avresample.h index 6105759399..b705a45cde 100644 --- a/libavresample/avresample.h +++ b/libavresample/avresample.h @@ -95,6 +95,7 @@ #include "libavutil/avutil.h" #include "libavutil/channel_layout.h" #include "libavutil/dict.h" +#include "libavutil/frame.h" #include "libavutil/log.h" #include "libavutil/mathematics.h" @@ -165,6 +166,10 @@ AVAudioResampleContext *avresample_alloc_context(void); /** * Initialize AVAudioResampleContext. + * @note The context must be configured using the AVOption API. + * + * @see av_opt_set_int() + * @see av_opt_set_dict() * * @param avr audio resample context * @return 0 on success, negative AVERROR code on failure @@ -422,6 +427,70 @@ int avresample_available(AVAudioResampleContext *avr); */ int avresample_read(AVAudioResampleContext *avr, uint8_t **output, int nb_samples); +/** + * Convert the samples in the input AVFrame and write them to the output AVFrame. + * + * Input and output AVFrames must have channel_layout, sample_rate and format set. + * + * The upper bound on the number of output samples is obtained through + * avresample_get_out_samples(). + * + * If the output AVFrame does not have the data pointers allocated the nb_samples + * field will be set using avresample_get_out_samples() and av_frame_get_buffer() + * is called to allocate the frame. + * + * The output AVFrame can be NULL or have fewer allocated samples than required. + * In this case, any remaining samples not written to the output will be added + * to an internal FIFO buffer, to be returned at the next call to this function + * or to avresample_convert() or to avresample_read(). + * + * If converting sample rate, there may be data remaining in the internal + * resampling delay buffer. avresample_get_delay() tells the number of + * remaining samples. To get this data as output, call this function or + * avresample_convert() with NULL input. + * + * At the end of the conversion process, there may be data remaining in the + * internal FIFO buffer. avresample_available() tells the number of remaining + * samples. To get this data as output, either call this function or + * avresample_convert() with NULL input or call avresample_read(). + * + * If the AVAudioResampleContext configuration does not match the output and + * input AVFrame settings the conversion does not take place and depending on + * which AVFrame is not matching AVERROR_OUTPUT_CHANGED, AVERROR_INPUT_CHANGED + * or AVERROR_OUTPUT_CHANGED|AVERROR_INPUT_CHANGED is returned. + * + * @see avresample_get_out_samples() + * @see avresample_available() + * @see avresample_convert() + * @see avresample_read() + * @see avresample_get_delay() + * + * @param avr audio resample context + * @param output output AVFrame + * @param input input AVFrame + * @return 0 on success, AVERROR on failure or nonmatching + * configuration. + */ +int avresample_convert_frame(AVAudioResampleContext *avr, + AVFrame *output, AVFrame *input); + +/** + * Configure or reconfigure the AVAudioResampleContext using the information + * provided by the AVFrames. + * + * The original resampling context is reset even on failure. + * The function calls avresample_close() internally if the context is open. + * + * @see avresample_open(); + * @see avresample_close(); + * + * @param avr audio resample context + * @param output output AVFrame + * @param input input AVFrame + * @return 0 on success, AVERROR on failure. + */ +int avresample_config(AVAudioResampleContext *avr, AVFrame *out, AVFrame *in); + /** * @} */ diff --git a/libavresample/utils.c b/libavresample/utils.c index 851cd354d8..5d095c054b 100644 --- a/libavresample/utils.c +++ b/libavresample/utils.c @@ -21,6 +21,7 @@ #include "libavutil/common.h" #include "libavutil/dict.h" #include "libavutil/error.h" +#include "libavutil/frame.h" #include "libavutil/log.h" #include "libavutil/mem.h" #include "libavutil/opt.h" @@ -500,6 +501,135 @@ int attribute_align_arg avresample_convert(AVAudioResampleContext *avr, current_buffer); } +int avresample_config(AVAudioResampleContext *avr, AVFrame *out, AVFrame *in) +{ + if (avresample_is_open(avr)) { + avresample_close(avr); + } + + if (in) { + avr->in_channel_layout = in->channel_layout; + avr->in_sample_rate = in->sample_rate; + avr->in_sample_fmt = in->format; + } + + if (out) { + avr->out_channel_layout = out->channel_layout; + avr->out_sample_rate = out->sample_rate; + avr->out_sample_fmt = out->format; + } + + return 0; +} + +static int config_changed(AVAudioResampleContext *avr, + AVFrame *out, AVFrame *in) +{ + int ret = 0; + + if (in) { + if (avr->in_channel_layout != in->channel_layout || + avr->in_sample_rate != in->sample_rate || + avr->in_sample_fmt != in->format) { + ret |= AVERROR_INPUT_CHANGED; + } + } + + if (out) { + if (avr->out_channel_layout != out->channel_layout || + avr->out_sample_rate != out->sample_rate || + avr->out_sample_fmt != out->format) { + ret |= AVERROR_OUTPUT_CHANGED; + } + } + + return ret; +} + +static inline int convert_frame(AVAudioResampleContext *avr, + AVFrame *out, AVFrame *in) +{ + int ret; + uint8_t **out_data = NULL, **in_data = NULL; + int out_linesize = 0, in_linesize = 0; + int out_nb_samples = 0, in_nb_samples = 0; + + if (out) { + out_data = out->extended_data; + out_linesize = out->linesize[0]; + out_nb_samples = out->nb_samples; + } + + if (in) { + in_data = in->extended_data; + in_linesize = in->linesize[0]; + in_nb_samples = in->nb_samples; + } + + ret = avresample_convert(avr, out_data, out_linesize, + out_nb_samples, + in_data, in_linesize, + in_nb_samples); + + if (ret < 0) { + if (out) + out->nb_samples = 0; + return ret; + } + + if (out) + out->nb_samples = ret; + + return 0; +} + +static inline int available_samples(AVFrame *out) +{ + int bytes_per_sample = av_get_bytes_per_sample(out->format); + int samples = out->linesize[0] / bytes_per_sample; + + if (av_sample_fmt_is_planar(out->format)) { + return samples; + } else { + int channels = av_get_channel_layout_nb_channels(out->channel_layout); + return samples / channels; + } +} + +int avresample_convert_frame(AVAudioResampleContext *avr, + AVFrame *out, AVFrame *in) +{ + int ret, setup = 0; + + if (!avresample_is_open(avr)) { + if ((ret = avresample_config(avr, out, in)) < 0) + return ret; + if ((ret = avresample_open(avr)) < 0) + return ret; + setup = 1; + } else { + // return as is or reconfigure for input changes? + if ((ret = config_changed(avr, out, in))) + return ret; + } + + if (out) { + if (!out->linesize[0]) { + out->nb_samples = avresample_get_out_samples(avr, in->nb_samples); + if ((ret = av_frame_get_buffer(out, 0)) < 0) { + if (setup) + avresample_close(avr); + return ret; + } + } else { + if (!out->nb_samples) + out->nb_samples = available_samples(out); + } + } + + return convert_frame(avr, out, in); +} + int avresample_get_matrix(AVAudioResampleContext *avr, double *matrix, int stride) { diff --git a/libavresample/version.h b/libavresample/version.h index fa7fa29555..34623a138c 100644 --- a/libavresample/version.h +++ b/libavresample/version.h @@ -28,7 +28,7 @@ #include "libavutil/version.h" #define LIBAVRESAMPLE_VERSION_MAJOR 2 -#define LIBAVRESAMPLE_VERSION_MINOR 0 +#define LIBAVRESAMPLE_VERSION_MINOR 1 #define LIBAVRESAMPLE_VERSION_MICRO 0 #define LIBAVRESAMPLE_VERSION_INT AV_VERSION_INT(LIBAVRESAMPLE_VERSION_MAJOR, \ -- cgit v1.2.3