[146012] trunk/dports/audio/xmms2

devans at macports.org devans at macports.org
Wed Feb 24 13:38:09 PST 2016


Revision: 146012
          https://trac.macports.org/changeset/146012
Author:   devans at macports.org
Date:     2016-02-24 13:38:08 -0800 (Wed, 24 Feb 2016)
Log Message:
-----------
xmms2: patch plugin avcodec through upstream commit fc66249 (2014-01-29) for ffmpeg-3.0 compatibility, increment revision.

Modified Paths:
--------------
    trunk/dports/audio/xmms2/Portfile

Added Paths:
-----------
    trunk/dports/audio/xmms2/files/patch-ffmpeg-3.0.diff

Modified: trunk/dports/audio/xmms2/Portfile
===================================================================
--- trunk/dports/audio/xmms2/Portfile	2016-02-24 19:59:35 UTC (rev 146011)
+++ trunk/dports/audio/xmms2/Portfile	2016-02-24 21:38:08 UTC (rev 146012)
@@ -6,7 +6,7 @@
 
 name                    xmms2
 version                 0.8DrO_o
-revision                10
+revision                11
 categories              audio
 # Mostly LGPL, some plugins and clients are GPL
 license                 LGPL-2.1+ GPL-2+ GPL-2
@@ -54,8 +54,13 @@
                         port:libcdio \
                         port:libcdio-paranoia
 
+# the first 3 patchfiles sequentially patch src/plugins/avcodec - order is important!
+# patch-ffmpeg-3.0.diff patches the avcodec plugin through upstream commit fc66249 (2014-01-29)
+# https://git.xmms2.org/xmms2/xmms2-devel/commit/src/plugins/avcodec?id=fc66249
+
 patchfiles              patch-ffmpeg-2.0.diff \
                         patch-nellymoser.diff \
+                        patch-ffmpeg-3.0.diff \
                         patch-src-plugins-modplug-modplug.c.diff \
                         patch-wscript.diff \
                         patch-src-clients-vistest-wscript.diff \

Added: trunk/dports/audio/xmms2/files/patch-ffmpeg-3.0.diff
===================================================================
--- trunk/dports/audio/xmms2/files/patch-ffmpeg-3.0.diff	                        (rev 0)
+++ trunk/dports/audio/xmms2/files/patch-ffmpeg-3.0.diff	2016-02-24 21:38:08 UTC (rev 146012)
@@ -0,0 +1,576 @@
+diff -ur src/plugins/avcodec.orig/avcodec.c src/plugins/avcodec/avcodec.c
+--- src/plugins/avcodec.orig/avcodec.c	2016-02-24 11:59:39.000000000 -0800
++++ src/plugins/avcodec/avcodec.c	2016-02-24 12:01:27.000000000 -0800
+@@ -1,7 +1,7 @@
+ /** @file avcodec.c
+  *  Decoder plugin for ffmpeg avcodec formats
+  *
+- *  Copyright (C) 2006-2011 XMMS2 Team
++ *  Copyright (C) 2006-2014 XMMS2 Team
+  *
+  *  This library is free software; you can redistribute it and/or
+  *  modify it under the terms of the GNU Lesser General Public
+@@ -14,20 +14,20 @@
+  *  Lesser General Public License for more details.
+  */
+ 
+-#include "xmms_configuration.h"
+-#include "xmms/xmms_xformplugin.h"
+-#include "xmms/xmms_sample.h"
+-#include "xmms/xmms_log.h"
++#include <xmms_configuration.h>
++#include <xmms/xmms_xformplugin.h>
++#include <xmms/xmms_sample.h>
++#include <xmms/xmms_log.h>
+ 
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #include <glib.h>
++#include <libavutil/mem.h>
+ 
+ #include "avcodec_compat.h"
+ 
+ #define AVCODEC_BUFFER_SIZE 16384
+-#define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
+ 
+ typedef struct {
+ 	AVCodecContext *codecctx;
+@@ -37,6 +37,8 @@
+ 	guint buffer_size;
+ 	gboolean no_demuxer;
+ 
++	AVFrame *read_out_frame;
++
+ 	guint channels;
+ 	guint samplerate;
+ 	xmms_sample_format_t sampleformat;
+@@ -54,10 +56,14 @@
+ static gboolean xmms_avcodec_plugin_setup (xmms_xform_plugin_t *xform_plugin);
+ static gboolean xmms_avcodec_init (xmms_xform_t *xform);
+ static void xmms_avcodec_destroy (xmms_xform_t *xform);
++static gint xmms_avcodec_internal_read_some (xmms_xform_t *xform, xmms_avcodec_data_t *data, xmms_error_t *error);
++static gint xmms_avcodec_internal_decode_some (xmms_avcodec_data_t *data);
++static void xmms_avcodec_internal_append (xmms_avcodec_data_t *data);
+ static gint xmms_avcodec_read (xmms_xform_t *xform, xmms_sample_t *buf, gint len,
+                                xmms_error_t *error);
+ static gint64 xmms_avcodec_seek (xmms_xform_t *xform, gint64 samples,
+                                  xmms_xform_seek_mode_t whence, xmms_error_t *err);
++static xmms_sample_format_t xmms_avcodec_translate_sample_format (enum AVSampleFormat av_sample_format);
+ 
+ /*
+  * Plugin header
+@@ -93,6 +99,16 @@
+ 	                              "audio/x-ffmpeg-*",
+ 	                              NULL);
+ 
++	XMMS_DBG ("avcodec version at build time is %d.%d.%d",
++	          (LIBAVCODEC_VERSION_INT >> 16),
++	          (LIBAVCODEC_VERSION_INT >> 8) & 0xff,
++	          LIBAVCODEC_VERSION_INT & 0xff);
++	XMMS_DBG ("avcodec version at run time is %d.%d.%d",
++	          (avcodec_version() >> 16),
++	          (avcodec_version() >> 8) & 0xff,
++	          avcodec_version() & 0xff);
++	XMMS_DBG ("avcodec configuration is %s", avcodec_configuration());
++
+ 	return TRUE;
+ }
+ 
+@@ -108,6 +124,7 @@
+ 
+ 	avcodec_close (data->codecctx);
+ 	av_free (data->codecctx);
++	av_frame_free (&data->read_out_frame);
+ 
+ 	g_string_free (data->outbuf, TRUE);
+ 	g_free (data->buffer);
+@@ -133,8 +150,11 @@
+ 	data->buffer_size = AVCODEC_BUFFER_SIZE;
+ 	data->codecctx = NULL;
+ 
++	data->read_out_frame = av_frame_alloc ();
++
+ 	xmms_xform_private_data_set (xform, data);
+ 
++	avcodec_init ();
+ 	avcodec_register_all ();
+ 
+ 	mimetype = xmms_xform_indata_get_str (xform,
+@@ -161,12 +181,12 @@
+ 		data->channels = ret;
+ 	}
+ 
+-	/* bitrate required for WMA files */
++	/* Required by WMA xform. */
+ 	xmms_xform_auxdata_get_int (xform,
+ 	                            "bitrate",
+ 	                            &data->bitrate);
+ 
+-	/* ALAC and MAC require bits per sample field to be 16 */
++	/* Required by tta and apefile xforms. */
+ 	xmms_xform_auxdata_get_int (xform,
+ 	                            "samplebits",
+ 	                            &data->samplebits);
+@@ -197,11 +217,11 @@
+ 		} else {
+ 			/* A demuxer plugin forgot to give decoder config? */
+ 			xmms_log_error ("Decoder config data not found!");
+-			return FALSE;
++			goto err;
+ 		}
+ 	}
+ 
+-	data->codecctx = avcodec_alloc_context3 (NULL);
++	data->codecctx = avcodec_alloc_context3 (codec);
+ 	data->codecctx->sample_rate = data->samplerate;
+ 	data->codecctx->channels = data->channels;
+ 	data->codecctx->bit_rate = data->bitrate;
+@@ -221,7 +241,7 @@
+ 
+ 		/* some codecs need to have something read before they set
+ 		 * the samplerate and channels correctly, unfortunately... */
+-		if ((ret = xmms_avcodec_read (xform, buf, 42, &error)) > 0) {
++		if ((ret = xmms_avcodec_read (xform, buf, sizeof (buf), &error)) > 0) {
+ 			g_string_insert_len (data->outbuf, 0, buf, ret);
+ 		} else {
+ 			XMMS_DBG ("First read failed, codec is not working...");
+@@ -232,12 +252,17 @@
+ 
+ 	data->samplerate = data->codecctx->sample_rate;
+ 	data->channels = data->codecctx->channels;
++	data->sampleformat = xmms_avcodec_translate_sample_format (data->codecctx->sample_fmt);
++	if (data->sampleformat == XMMS_SAMPLE_FORMAT_UNKNOWN) {
++		avcodec_close (data->codecctx);
++		goto err;
++	}
+ 
+ 	xmms_xform_outdata_type_add (xform,
+ 	                             XMMS_STREAM_TYPE_MIMETYPE,
+ 	                             "audio/pcm",
+ 	                             XMMS_STREAM_TYPE_FMT_FORMAT,
+-	                             XMMS_SAMPLE_FORMAT_S16,
++	                             data->sampleformat,
+ 	                             XMMS_STREAM_TYPE_FMT_CHANNELS,
+ 	                             data->channels,
+ 	                             XMMS_STREAM_TYPE_FMT_SAMPLERATE,
+@@ -252,6 +277,9 @@
+ 	if (data->codecctx) {
+ 		av_free (data->codecctx);
+ 	}
++	if (data->read_out_frame) {
++		avcodec_free_frame (&data->read_out_frame);
++	}
+ 	g_string_free (data->outbuf, TRUE);
+ 	g_free (data->extradata);
+ 	g_free (data);
+@@ -264,102 +292,24 @@
+                    xmms_error_t *error)
+ {
+ 	xmms_avcodec_data_t *data;
+-	char outbuf[MAX_AUDIO_FRAME_SIZE];
+-	gint outbufsize, bytes_read = 0;
+ 	guint size;
+ 
+ 	data = xmms_xform_private_data_get (xform);
+ 	g_return_val_if_fail (data, -1);
+ 
+-	size = MIN (data->outbuf->len, len);
+-	while (size == 0) {
+-		AVPacket packet;
+-		av_init_packet (&packet);
++	while (0 == (size = MIN (data->outbuf->len, len))) {
++		gint res;
+ 
+ 		if (data->no_demuxer || data->buffer_length == 0) {
+-			gint read_total;
+-
+-			bytes_read = xmms_xform_read (xform,
+-			                              (gchar *) (data->buffer + data->buffer_length),
+-			                              data->buffer_size - data->buffer_length,
+-			                              error);
+-
+-			if (bytes_read < 0) {
+-				XMMS_DBG ("Error while reading data");
+-				return bytes_read;
+-			} else if (bytes_read == 0) {
+-				XMMS_DBG ("EOF");
+-				return 0;
+-			}
++			gint bytes_read;
+ 
+-			read_total = bytes_read;
+-
+-			/* If we have a demuxer plugin, make sure we read the whole packet */
+-			while (read_total == data->buffer_size && !data->no_demuxer) {
+-				/* multiply the buffer size and try to read again */
+-				data->buffer = g_realloc (data->buffer, data->buffer_size * 2);
+-				bytes_read = xmms_xform_read (xform,
+-				                              (gchar *) data->buffer +
+-				                                data->buffer_size,
+-				                              data->buffer_size,
+-				                              error);
+-				data->buffer_size *= 2;
+-
+-				if (bytes_read < 0) {
+-					XMMS_DBG ("Error while reading data");
+-					return bytes_read;
+-				}
+-
+-				read_total += bytes_read;
+-
+-				if (read_total < data->buffer_size) {
+-					/* finally double the buffer size for performance reasons, the
+-					 * hotspot handling likes to fit two frames in the buffer */
+-					data->buffer = g_realloc (data->buffer, data->buffer_size * 2);
+-					data->buffer_size *= 2;
+-					XMMS_DBG ("Reallocated avcodec internal buffer to be %d bytes",
+-					          data->buffer_size);
+-
+-					break;
+-				}
+-			}
+-
+-			/* Update the buffer length */
+-			data->buffer_length += read_total;
++			bytes_read = xmms_avcodec_internal_read_some (xform, data, error);
++			if (bytes_read <= 0) { return bytes_read; }
+ 		}
+ 
+-		packet.data = data->buffer;
+-		packet.size = data->buffer_length;
+-
+-		outbufsize = sizeof (outbuf);
+-		bytes_read = avcodec_decode_audio3 (data->codecctx, (short *) outbuf,
+-		                                    &outbufsize, &packet);
+-
+-		/* The DTS decoder of ffmpeg is buggy and always returns
+-		 * the input buffer length, get frame length from header */
+-		if (!strcmp (data->codec_id, "dca") && bytes_read > 0) {
+-			bytes_read = ((int)data->buffer[5] << 12) |
+-			             ((int)data->buffer[6] << 4) |
+-			             ((int)data->buffer[7] >> 4);
+-			bytes_read = (bytes_read & 0x3fff) + 1;
+-		}
+-
+-		if (bytes_read < 0 || bytes_read > data->buffer_length) {
+-			XMMS_DBG ("Error decoding data!");
+-			return -1;
+-		} else if (bytes_read != data->buffer_length) {
+-			g_memmove (data->buffer,
+-			           data->buffer + bytes_read,
+-			           data->buffer_length - bytes_read);
+-		}
+-
+-		data->buffer_length -= bytes_read;
+-
+-		if (outbufsize > 0) {
+-			g_string_append_len (data->outbuf, outbuf, outbufsize);
+-		}
+-
+-		size = MIN (data->outbuf->len, len);
++		res = xmms_avcodec_internal_decode_some (data);
++		if (res < 0) { return res; }
++		if (res > 0) { xmms_avcodec_internal_append (data); }
+ 	}
+ 
+ 	memcpy (buf, data->outbuf->str, size);
+@@ -372,8 +322,6 @@
+ xmms_avcodec_seek (xmms_xform_t *xform, gint64 samples, xmms_xform_seek_mode_t whence, xmms_error_t *err)
+ {
+ 	xmms_avcodec_data_t *data;
+-	char outbuf[MAX_AUDIO_FRAME_SIZE];
+-	gint outbufsize, bytes_read = 0;
+ 	gint64 ret = -1;
+ 
+ 	g_return_val_if_fail (xform, -1);
+@@ -391,23 +339,11 @@
+ 
+ 	/* The buggy ape decoder doesn't flush buffers, so we need to finish decoding
+ 	 * the frame before seeking to avoid segfaults... this hack sucks */
++	/* FIXME: Is ^^^ still true? */
+ 	while (data->buffer_length > 0) {
+-		AVPacket packet;
+-		av_init_packet (&packet);
+-		packet.data = data->buffer;
+-		packet.size = data->buffer_length;
+-
+-		outbufsize = sizeof (outbuf);
+-		bytes_read = avcodec_decode_audio3 (data->codecctx, (short *) outbuf,
+-		                                    &outbufsize, &packet);
+-
+-		if (bytes_read < 0 || bytes_read > data->buffer_length) {
+-			XMMS_DBG ("Error decoding data!");
++		if (xmms_avcodec_internal_decode_some (data) < 0) {
+ 			return -1;
+ 		}
+-
+-		data->buffer_length -= bytes_read;
+-		g_memmove (data->buffer, data->buffer + bytes_read, data->buffer_length);
+ 	}
+ 
+ 	ret = xmms_xform_seek (xform, samples, whence, err);
+@@ -421,3 +357,178 @@
+ 
+ 	return ret;
+ }
++
++static xmms_sample_format_t
++xmms_avcodec_translate_sample_format (enum AVSampleFormat av_sample_format)
++{
++	switch (av_sample_format) {
++	case AV_SAMPLE_FMT_U8:
++	case AV_SAMPLE_FMT_U8P:
++		return XMMS_SAMPLE_FORMAT_U8;
++	case AV_SAMPLE_FMT_S16:
++	case AV_SAMPLE_FMT_S16P:
++		return XMMS_SAMPLE_FORMAT_S16;
++	case AV_SAMPLE_FMT_S32:
++	case AV_SAMPLE_FMT_S32P:
++		return XMMS_SAMPLE_FORMAT_S32;
++	case AV_SAMPLE_FMT_FLT:
++	case AV_SAMPLE_FMT_FLTP:
++		return XMMS_SAMPLE_FORMAT_FLOAT;
++	case AV_SAMPLE_FMT_DBL:
++	case AV_SAMPLE_FMT_DBLP:
++		return XMMS_SAMPLE_FORMAT_DOUBLE;
++	default:
++		XMMS_DBG ("AVSampleFormat (%i: %s) not supported.", av_sample_format,
++		          av_get_sample_fmt_name (av_sample_format));
++		return XMMS_SAMPLE_FORMAT_UNKNOWN;
++	}
++}
++
++/*
++Read some data from our source of data to data->buffer, updating buffer_length
++and buffer_size as needed.
++
++Returns: on error: negative
++         on EOF: zero
++         otherwise: number of bytes read.
++*/
++static gint
++xmms_avcodec_internal_read_some (xmms_xform_t *xform,
++                                 xmms_avcodec_data_t *data,
++                                 xmms_error_t *error)
++{
++	gint bytes_read, read_total;
++
++	bytes_read = xmms_xform_read (xform,
++	                              (gchar *) (data->buffer + data->buffer_length),
++	                              data->buffer_size - data->buffer_length,
++	                              error);
++
++	if (bytes_read < 0) {
++		XMMS_DBG ("Error while reading data");
++		return bytes_read;
++	} else if (bytes_read == 0) {
++		XMMS_DBG ("EOF");
++		return 0;
++	}
++
++	read_total = bytes_read;
++
++	/* If we have a demuxer plugin, make sure we read the whole packet */
++	while (read_total == data->buffer_size && !data->no_demuxer) {
++		/* multiply the buffer size and try to read again */
++		data->buffer = g_realloc (data->buffer, data->buffer_size * 2);
++		bytes_read = xmms_xform_read (xform,
++		                              (gchar *) data->buffer +
++		                                data->buffer_size,
++		                              data->buffer_size,
++		                              error);
++		data->buffer_size *= 2;
++
++		if (bytes_read < 0) {
++			XMMS_DBG ("Error while reading data");
++			return bytes_read;
++		}
++
++		read_total += bytes_read;
++
++		if (read_total < data->buffer_size) {
++			/* finally double the buffer size for performance reasons, the
++			 * hotspot handling likes to fit two frames in the buffer */
++			data->buffer = g_realloc (data->buffer, data->buffer_size * 2);
++			data->buffer_size *= 2;
++			XMMS_DBG ("Reallocated avcodec internal buffer to be %d bytes",
++			          data->buffer_size);
++
++			break;
++		}
++	}
++
++	/* Update the buffer length */
++	data->buffer_length += read_total;
++
++	return read_total;
++}
++
++/*
++Decode some data from data->buffer[0..data->buffer_length-1] to
++data->read_out_frame
++
++Returns: on error: negative
++         on no new data produced: zero
++         otherwise: positive
++
++FIXME: data->buffer should be at least data->buffer_length +
++FF_INPUT_BUFFER_PADDING_SIZE long.
++*/
++static gint
++xmms_avcodec_internal_decode_some (xmms_avcodec_data_t *data)
++{
++	int got_frame = 0;
++	gint bytes_read = 0;
++	AVPacket packet;
++
++	av_init_packet (&packet);
++	packet.data = data->buffer;
++	packet.size = data->buffer_length;
++
++	/* clear buffers and reset fields to defaults */
++	av_frame_unref (data->read_out_frame);
++
++	bytes_read = avcodec_decode_audio4 (
++		data->codecctx, data->read_out_frame, &got_frame, &packet);
++
++	/* The DTS decoder of ffmpeg is buggy and always returns
++	 * the input buffer length, get frame length from header */
++	/* FIXME: Is ^^^^ still true? */
++	if (!strcmp (data->codec_id, "dca") && bytes_read > 0) {
++		bytes_read = ((int)data->buffer[5] << 12) |
++		             ((int)data->buffer[6] << 4) |
++		             ((int)data->buffer[7] >> 4);
++		bytes_read = (bytes_read & 0x3fff) + 1;
++	}
++
++	if (bytes_read < 0 || bytes_read > data->buffer_length) {
++		XMMS_DBG ("Error decoding data!");
++		return -1;
++	}
++
++	if (bytes_read < data->buffer_length) {
++		data->buffer_length -= bytes_read;
++		g_memmove (data->buffer,
++		           data->buffer + bytes_read,
++		           data->buffer_length);
++	} else {
++		data->buffer_length = 0;
++	}
++
++	return got_frame ? 1 : 0;
++}
++
++static void
++xmms_avcodec_internal_append (xmms_avcodec_data_t *data)
++{
++	enum AVSampleFormat fmt = (enum AVSampleFormat) data->read_out_frame->format;
++	int samples = data->read_out_frame->nb_samples;
++	int channels = data->codecctx->channels;
++	int bps = av_get_bytes_per_sample (fmt);
++
++	if (av_sample_fmt_is_planar (fmt)) {
++		/* Convert from planar to packed format */
++		gint i, j;
++
++		for (i = 0; i < samples; i++) {
++			for (j = 0; j < channels; j++) {
++				g_string_append_len (
++					data->outbuf,
++					(gchar *) (data->read_out_frame->extended_data[j] + i*bps),
++					bps
++				);
++			}
++		}
++	} else {
++		g_string_append_len (data->outbuf,
++		                     (gchar *) data->read_out_frame->extended_data[0],
++		                     samples * channels * bps);
++	}
++}
+diff -ur src/plugins/avcodec.orig/avcodec_compat.h src/plugins/avcodec/avcodec_compat.h
+--- src/plugins/avcodec.orig/avcodec_compat.h	2016-02-24 11:59:39.000000000 -0800
++++ src/plugins/avcodec/avcodec_compat.h	2016-02-24 12:02:03.000000000 -0800
+@@ -1,7 +1,7 @@
+ /** @file avcodec_compat.h
+  *  Compatibility header for libavcodec backwards compatibility
+  *
+- *  Copyright (C) 2011 XMMS2 Team
++ *  Copyright (C) 2011-2014 XMMS2 Team
+  *
+  *  This library is free software; you can redistribute it and/or
+  *  modify it under the terms of the GNU Lesser General Public
+@@ -65,3 +65,35 @@
+ # define AVMEDIA_TYPE_AUDIO CODEC_TYPE_AUDIO
+ #endif
+ 
++/* Calling avcodec_init is not necessary after 53.04 (ffmpeg 0.9) */
++#if LIBAVCODEC_VERSION_INT >= 0x350400
++# define avcodec_init()
++#endif
++
++/* Map avcodec_alloc_context3 into the deprecated version
++ * avcodec_alloc_context in versions earlier than 53.04 (ffmpeg 0.9) */
++#if LIBAVCODEC_VERSION_INT < 0x350400
++# define avcodec_alloc_context3(codec) \
++    avcodec_alloc_context()
++#endif
++
++/* Map avcodec_open2 into the deprecated version
++ * avcodec_open in versions earlier than 53.04 (ffmpeg 0.9) */
++#if LIBAVCODEC_VERSION_INT < 0x350400
++# define avcodec_open2(avctx, codec, options) \
++    avcodec_open(avctx, codec)
++#endif
++
++/* Map avcodec_free_frame to av_freep if the former doesn't exist.
++ * (This is in versions earlier than 54.28.0 (libav) or 54.59.100 (ffmpeg)) */
++#if ! HAVE_AVCODEC_FREE_FRAME
++# define avcodec_free_frame av_freep
++#endif
++
++/* Map av_frame_alloc, av_frame_unref, av_frame_free into their
++ * deprecated versions in versions earlier than 55.28.1 */
++#if LIBAVCODEC_VERSION_INT < 0x371c01
++# define av_frame_alloc avcodec_alloc_frame
++# define av_frame_unref avcodec_get_frame_defaults
++# define av_frame_free avcodec_free_frame
++#endif
+diff -ur src/plugins/avcodec.orig/wscript src/plugins/avcodec/wscript
+--- src/plugins/avcodec.orig/wscript	2016-02-24 11:59:39.000000000 -0800
++++ src/plugins/avcodec/wscript	2016-02-24 12:00:41.000000000 -0800
+@@ -1,10 +1,33 @@
+ from waftools.plugin import plugin
+ 
++## Code fragments for configuration
++avcodec_free_frame_fragment = """
++#ifdef HAVE_LIBAVCODEC_AVCODEC_H
++# include "libavcodec/avcodec.h"
++#else
++# include "avcodec.h"
++#endif
++int main(void) {
++    AVFrame *frame;
++
++    avcodec_free_frame (&frame);
++
++    return 0;
++}
++"""
++
+ def plugin_configure(conf):
+     conf.check_cfg(package="libavcodec", uselib_store="avcodec",
+             args="--cflags --libs")
+     conf.check_cc(header_name="avcodec.h", uselib="avcodec", type="cshlib", mandatory=False)
+     conf.check_cc(header_name="libavcodec/avcodec.h", uselib="avcodec", type="cshlib", mandatory=False)
+ 
++    # non-mandatory function avcodec_free_frame since
++    # * ffmpeg: commit 46a3595, lavc 54.59.100, release 1.0
++    # * libav: commit a42aada, lavc 54.28.0, release 9
++    conf.check_cc(fragment=avcodec_free_frame_fragment, uselib="avcodec",
++                  uselib_store="avcodec_free_frame",
++                  msg="Checking for function avcodec_free_frame", mandatory=False)
++
+ configure, build = plugin('avcodec', configure=plugin_configure,
+                           libs=["avcodec"])
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