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Implement libavfilter audio framework.

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Patch by S.N. Hemanth Meenakshisundaram * smeenaks * ucsd * edu *.

Originally committed as revision 24811 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
S.N. Hemanth Meenakshisundaram 2010-08-17 18:08:03 +00:00 committed by Stefano Sabatini
parent a8542e433e
commit ad2c950154
4 changed files with 274 additions and 10 deletions
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61
libavfilter/avfilter.c
View File

@ -21,6 +21,7 @@
/* #define DEBUG */
#include "libavcodec/audioconvert.c"
#include "libavutil/pixdesc.h"
#include "libavcore/imgutils.h"
#include "avfilter.h"
@ -58,6 +59,13 @@ AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
return NULL;
}
*ret->video = *ref->video;
} else if (ref->type == AVMEDIA_TYPE_AUDIO) {
ret->audio = av_malloc(sizeof(AVFilterBufferRefAudioProps));
if (!ret->audio) {
av_free(ret);
return NULL;
}
*ret->audio = *ref->audio;
}
ret->perms &= pmask;
ret->buf->refcount ++;
@ -69,6 +77,7 @@ void avfilter_unref_buffer(AVFilterBufferRef *ref)
if(!(--ref->buf->refcount))
ref->buf->free(ref->buf);
av_free(ref->video);
av_free(ref->audio);
av_free(ref);
}
@ -225,6 +234,24 @@ AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int
return ret;
}
AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
enum SampleFormat sample_fmt, int size,
int64_t channel_layout, int planar)
{
AVFilterBufferRef *ret = NULL;
if (link_dpad(link).get_audio_buffer)
ret = link_dpad(link).get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
if (!ret)
ret = avfilter_default_get_audio_buffer(link, perms, sample_fmt, size, channel_layout, planar);
if (ret)
ret->type = AVMEDIA_TYPE_AUDIO;
return ret;
}
int avfilter_request_frame(AVFilterLink *link)
{
FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
@ -345,6 +372,40 @@ void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
draw_slice(link, y, h, slice_dir);
}
void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
{
void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
AVFilterPad *dst = &link_dpad(link);
if (!(filter_samples = dst->filter_samples))
filter_samples = avfilter_default_filter_samples;
/* prepare to copy the samples if the buffer has insufficient permissions */
if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
dst->rej_perms & samplesref->perms) {
av_log(link->dst, AV_LOG_DEBUG,
"Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
samplesref->perms, link_dpad(link).min_perms, link_dpad(link).rej_perms);
link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
samplesref->format,
samplesref->audio->size,
samplesref->audio->channel_layout,
samplesref->audio->planar);
link->cur_buf->pts = samplesref->pts;
link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
/* Copy actual data into new samples buffer */
memcpy(link->cur_buf->data[0], samplesref->data[0], samplesref->audio->size);
avfilter_unref_buffer(samplesref);
} else
link->cur_buf = samplesref;
filter_samples(link, link->cur_buf);
}
#define MAX_REGISTERED_AVFILTERS_NB 64
static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];

95
libavfilter/avfilter.h
View File

@ -25,7 +25,7 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 1
#define LIBAVFILTER_VERSION_MINOR 35
#define LIBAVFILTER_VERSION_MINOR 36
#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
@ -87,6 +87,19 @@ typedef struct AVFilterBuffer {
#define AV_PERM_REUSE 0x08 ///< can output the buffer multiple times, with the same contents each time
#define AV_PERM_REUSE2 0x10 ///< can output the buffer multiple times, modified each time
/**
* Audio specific properties in a reference to an AVFilterBuffer. Since
* AVFilterBufferRef is common to different media formats, audio specific
* per reference properties must be separated out.
*/
typedef struct AVFilterBufferRefAudioProps {
int64_t channel_layout; ///< channel layout of audio buffer
int samples_nb; ///< number of audio samples
int size; ///< audio buffer size
uint32_t sample_rate; ///< audio buffer sample rate
int planar; ///< audio buffer - planar or packed
} AVFilterBufferRefAudioProps;
/**
* Video specific properties in a reference to an AVFilterBuffer. Since
* AVFilterBufferRef is common to different media formats, video specific
@ -110,7 +123,7 @@ typedef struct AVFilterBufferRefVideoProps {
*/
typedef struct AVFilterBufferRef {
AVFilterBuffer *buf; ///< the buffer that this is a reference to
uint8_t *data[8]; ///< picture data for each plane
uint8_t *data[8]; ///< picture/audio data for each plane
int linesize[8]; ///< number of bytes per line
int format; ///< media format
@ -121,11 +134,11 @@ typedef struct AVFilterBufferRef {
enum AVMediaType type; ///< media type of buffer data
AVFilterBufferRefVideoProps *video; ///< video buffer specific properties
AVFilterBufferRefAudioProps *audio; ///< audio buffer specific properties
} AVFilterBufferRef;
/**
* Copy properties of src to dst, without copying the actual video
* data.
* Copy properties of src to dst, without copying the actual data
*/
static inline void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilterBufferRef *src)
{
@ -135,6 +148,7 @@ static inline void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilt
switch (src->type) {
case AVMEDIA_TYPE_VIDEO: *dst->video = *src->video; break;
case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
}
}
@ -330,13 +344,23 @@ struct AVFilterPad {
void (*start_frame)(AVFilterLink *link, AVFilterBufferRef *picref);
/**
* Callback function to get a buffer. If NULL, the filter system will
* Callback function to get a video buffer. If NULL, the filter system will
* use avfilter_default_get_video_buffer().
*
* Input video pads only.
*/
AVFilterBufferRef *(*get_video_buffer)(AVFilterLink *link, int perms, int w, int h);
/**
* Callback function to get an audio buffer. If NULL, the filter system will
* use avfilter_default_get_audio_buffer().
*
* Input audio pads only.
*/
AVFilterBufferRef *(*get_audio_buffer)(AVFilterLink *link, int perms,
enum SampleFormat sample_fmt, int size,
int64_t channel_layout, int planar);
/**
* Callback called after the slices of a frame are completely sent. If
* NULL, the filter layer will default to releasing the reference stored
@ -354,6 +378,14 @@ struct AVFilterPad {
*/
void (*draw_slice)(AVFilterLink *link, int y, int height, int slice_dir);
/**
* Samples filtering callback. This is where a filter receives audio data
* and should do its processing.
*
* Input audio pads only.
*/
void (*filter_samples)(AVFilterLink *link, AVFilterBufferRef *samplesref);
/**
* Frame poll callback. This returns the number of immediately available
* frames. It should return a positive value if the next request_frame()
@ -400,15 +432,24 @@ void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir
/** default handler for end_frame() for video inputs */
void avfilter_default_end_frame(AVFilterLink *link);
/** default handler for config_props() for video outputs */
/** default handler for filter_samples() for audio inputs */
void avfilter_default_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
/** default handler for config_props() for audio/video outputs */
int avfilter_default_config_output_link(AVFilterLink *link);
/** default handler for config_props() for video inputs */
/** default handler for config_props() for audio/video inputs */
int avfilter_default_config_input_link (AVFilterLink *link);
/** default handler for get_video_buffer() for video inputs */
AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link,
int perms, int w, int h);
/** default handler for get_audio_buffer() for audio inputs */
AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
enum SampleFormat sample_fmt, int size,
int64_t channel_layout, int planar);
/**
* A helper for query_formats() which sets all links to the same list of
* formats. If there are no links hooked to this filter, the list of formats is
@ -428,10 +469,18 @@ void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
/** end_frame() handler for filters which simply pass video along */
void avfilter_null_end_frame(AVFilterLink *link);
/** filter_samples() handler for filters which simply pass audio along */
void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
/** get_video_buffer() handler for filters which simply pass video along */
AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link,
int perms, int w, int h);
/** get_audio_buffer() handler for filters which simply pass audio along */
AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
enum SampleFormat sample_fmt, int size,
int64_t channel_layout, int planar);
/**
* Filter definition. This defines the pads a filter contains, and all the
* callback functions used to interact with the filter.
@ -518,8 +567,13 @@ struct AVFilterLink {
enum AVMediaType type; ///< filter media type
/* These two parameters apply only to video */
int w; ///< agreed upon image width
int h; ///< agreed upon image height
/* These two parameters apply only to audio */
int64_t channel_layout; ///< channel layout of current buffer (see avcodec.h)
int64_t sample_rate; ///< samples per second
int format; ///< agreed upon media format
/**
@ -574,6 +628,23 @@ int avfilter_config_links(AVFilterContext *filter);
AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms,
int w, int h);
/**
* Request an audio samples buffer with a specific set of permissions.
*
* @param link the output link to the filter from which the buffer will
* be requested
* @param perms the required access permissions
* @param sample_fmt the format of each sample in the buffer to allocate
* @param size the buffer size in bytes
* @param channel_layout the number and type of channels per sample in the buffer to allocate
* @param planar audio data layout - planar or packed
* @return A reference to the samples. This must be unreferenced with
* avfilter_unref_samples when you are finished with it.
*/
AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
enum SampleFormat sample_fmt, int size,
int64_t channel_layout, int planar);
/**
* Request an input frame from the filter at the other end of the link.
* @param link the input link
@ -622,6 +693,16 @@ void avfilter_end_frame(AVFilterLink *link);
*/
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
/**
* Send a buffer of audio samples to the next filter.
*
* @param link the output link over which the audio samples are being sent
* @param samplesref a reference to the buffer of audio samples being sent. The
* receiving filter will free this reference when it no longer
* needs it or pass it on to the next filter.
*/
void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
/** Initialize the filter system. Register all builtin filters. */
void avfilter_register_all(void);

125
libavfilter/defaults.c
View File

@ -20,6 +20,7 @@
*/
#include "libavcore/imgutils.h"
#include "libavcodec/audioconvert.h"
#include "avfilter.h"
/* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
@ -79,6 +80,85 @@ fail:
return NULL;
}
AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
enum SampleFormat sample_fmt, int size,
int64_t channel_layout, int planar)
{
AVFilterBuffer *samples = av_mallocz(sizeof(AVFilterBuffer));
AVFilterBufferRef *ref = NULL;
int i, sample_size, chans_nb, bufsize, per_channel_size, step_size = 0;
char *buf;
if (!samples || !(ref = av_mallocz(sizeof(AVFilterBufferRef))))
goto fail;
ref->buf = samples;
ref->format = sample_fmt;
ref->audio = av_mallocz(sizeof(AVFilterBufferRefAudioProps));
if (!ref->audio)
goto fail;
ref->audio->channel_layout = channel_layout;
ref->audio->size = size;
ref->audio->planar = planar;
/* make sure the buffer gets read permission or it's useless for output */
ref->perms = perms | AV_PERM_READ;
samples->refcount = 1;
samples->free = avfilter_default_free_buffer;
sample_size = av_get_bits_per_sample_format(sample_fmt) >>3;
chans_nb = avcodec_channel_layout_num_channels(channel_layout);
per_channel_size = size/chans_nb;
ref->audio->samples_nb = per_channel_size/sample_size;
/* Set the number of bytes to traverse to reach next sample of a particular channel:
* For planar, this is simply the sample size.
* For packed, this is the number of samples * sample_size.
*/
for (i = 0; i < chans_nb; i++)
samples->linesize[i] = planar > 0 ? per_channel_size : sample_size;
memset(&samples->linesize[chans_nb], 0, (8-chans_nb) * sizeof(samples->linesize[0]));
/* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
bufsize = (size + 15)&~15;
buf = av_malloc(bufsize);
if (!buf)
goto fail;
/* For planar, set the start point of each channel's data within the buffer
* For packed, set the start point of the entire buffer only
*/
samples->data[0] = buf;
if (buf && planar) {
for (i = 1; i < chans_nb; i++) {
step_size += per_channel_size;
samples->data[i] = buf + step_size;
}
} else {
for (i = 1; i < chans_nb; i++)
samples->data[i] = buf;
}
memset(&samples->data[chans_nb], 0, (8-chans_nb) * sizeof(samples->data[0]));
memcpy(ref->data, samples->data, sizeof(ref->data));
memcpy(ref->linesize, samples->linesize, sizeof(ref->linesize));
return ref;
fail:
av_free(buf);
if (ref && ref->audio)
av_free(ref->audio);
av_free(ref);
av_free(samples);
return NULL;
}
void avfilter_default_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
AVFilterLink *out = NULL;
@ -123,14 +203,42 @@ void avfilter_default_end_frame(AVFilterLink *link)
}
}
/* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
void avfilter_default_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
{
AVFilterLink *outlink = NULL;
if (link->dst->output_count)
outlink = link->dst->outputs[0];
if (outlink) {
outlink->out_buf = avfilter_default_get_audio_buffer(link, AV_PERM_WRITE, samplesref->format,
samplesref->audio->size,
samplesref->audio->channel_layout,
samplesref->audio->planar);
outlink->out_buf->pts = samplesref->pts;
outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
avfilter_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
avfilter_unref_buffer(outlink->out_buf);
outlink->out_buf = NULL;
}
avfilter_unref_buffer(samplesref);
link->cur_buf = NULL;
}
/**
* default config_link() implementation for output video links to simplify
* the implementation of one input one output video filters */
int avfilter_default_config_output_link(AVFilterLink *link)
{
if(link->src->input_count && link->src->inputs[0]) {
link->w = link->src->inputs[0]->w;
link->h = link->src->inputs[0]->h;
if (link->type == AVMEDIA_TYPE_VIDEO) {
link->w = link->src->inputs[0]->w;
link->h = link->src->inputs[0]->h;
} else if (link->type == AVMEDIA_TYPE_AUDIO) {
link->channel_layout = link->src->inputs[0]->channel_layout;
link->sample_rate = link->src->inputs[0]->sample_rate;
}
} else {
/* XXX: any non-simple filter which would cause this branch to be taken
* really should implement its own config_props() for this link. */
@ -197,8 +305,21 @@ void avfilter_null_end_frame(AVFilterLink *link)
avfilter_end_frame(link->dst->outputs[0]);
}
void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
{
avfilter_filter_samples(link->dst->outputs[0], samplesref);
}
AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
}
AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
enum SampleFormat sample_fmt, int size,
int64_t channel_layout, int packed)
{
return avfilter_get_audio_buffer(link->dst->outputs[0], perms, sample_fmt,
size, channel_layout, packed);
}

3
libavfilter/formats.c
View File

@ -107,7 +107,8 @@ AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
{
AVFilterFormats *ret = NULL;
int fmt;
int num_formats = type == AVMEDIA_TYPE_VIDEO ? PIX_FMT_NB : 0;
int num_formats = type == AVMEDIA_TYPE_VIDEO ? PIX_FMT_NB :
type == AVMEDIA_TYPE_AUDIO ? SAMPLE_FMT_NB : 0;
for (fmt = 0; fmt < num_formats; fmt++)
if ((type != AVMEDIA_TYPE_VIDEO) ||