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gtk/modules/media/gtkffmediafile.c
Chun-wei Fan 432e8664e1 modules/media: Fix Visual Studio builds with older GLib 
The current definitions of the g_io_module_*() symbols do not build on
Visual Studio when building against GLib earlier than 2.75.0 due to the
way how these symbols are decorated in the GLib headers, as Visual Studio
does not allow symbols that were previously marked with 'extern' (or so)
to be marked with anything that is symantically different later.

As a result, if we are using Visual Studio and glib-2.74.x or earlier,
override _GLIB_EXTERN as appropriate in the modules/media sources before
including the GIO headers.  This sadly, means that we need a
configure-time check as it would have been too late if we checked the
GLib version using G_VERSION_CHECK macro, as the GIO headers would have
been included already.

There are similar items in the print backends, but we will not attempt
to update these files as they are not meant to be built for Windows.
2023-03-07 15:36:42 +08:00

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/*
* Copyright © 2018 Benjamin Otte
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include "config.h"
/*
* Sadly, we need this to build on Visual Studio against glib-2.74.x or earlier,
* otherwise the build will fail when building the g_io_module_*() bits with error C2375
* (redefinition; different linkage). This must be before including the Gio headers.
*/
#if defined (_MSC_VER) && defined (MODULES_OVERRIDE_GLIB_EXTERN)
# define _GLIB_EXTERN __declspec(dllexport) extern
#endif
#include "gtkffmediafileprivate.h"
#include <glib/gi18n-lib.h>
#include "gdk/gdkmemorytextureprivate.h"
#include <libavcodec/avcodec.h>
#include <libavdevice/avdevice.h>
#include <libavformat/avformat.h>
#include <libavutil/channel_layout.h>
#include <libavutil/pixdesc.h>
#include <libswresample/swresample.h>
#include <libswscale/swscale.h>
typedef struct _GtkVideoFrameFFMpeg GtkVideoFrameFFMpeg;
struct _GtkVideoFrameFFMpeg
{
GdkTexture *texture;
gint64 timestamp;
};
typedef struct _GtkFStream GtkFfStream;
struct _GtkFStream
{
AVCodecContext *codec_ctx;
AVStream *stream;
int stream_id;
int type;
};
struct _GtkFfMediaFile
{
GtkMediaFile parent_instance;
GFile *file;
GInputStream *input_stream;
AVFormatContext *device_ctx; /* used for avdevice audio playback */
AVFormatContext *format_ctx;
GtkFfStream *input_audio_stream;
GtkFfStream *input_video_stream;
GtkFfStream *output_audio_stream;
gint64 audio_samples_count;
// Resampling
struct SwrContext *swr_ctx;
AVFrame* audio_frame;
// Rescaling
struct SwsContext *sws_ctx;
enum AVPixelFormat sws_pix_fmt;
GdkMemoryFormat memory_format;
GtkVideoFrameFFMpeg current_frame;
GtkVideoFrameFFMpeg next_frame;
gint64 start_time; /* monotonic time when we displayed the last frame */
guint next_frame_cb; /* Source ID of next frame callback */
};
struct _GtkFfMediaFileClass
{
GtkMediaFileClass parent_class;
};
static void
gtk_video_frame_ffmpeg_init (GtkVideoFrameFFMpeg *frame,
GdkTexture *texture,
gint64 timestamp)
{
frame->texture = texture;
frame->timestamp = timestamp;
}
static void
gtk_video_frame_ffmpeg_clear (GtkVideoFrameFFMpeg *frame)
{
g_clear_object (&frame->texture);
frame->timestamp = 0;
}
static gboolean
gtk_video_frame_ffmpeg_is_empty (GtkVideoFrameFFMpeg *frame)
{
return frame->texture == NULL;
}
static void
gtk_video_frame_ffmpeg_move (GtkVideoFrameFFMpeg *dest,
GtkVideoFrameFFMpeg *src)
{
*dest = *src;
src->texture = NULL;
src->timestamp = 0;
}
static void
gtk_ff_media_file_paintable_snapshot (GdkPaintable *paintable,
GdkSnapshot *snapshot,
double width,
double height)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (paintable);
if (!gtk_video_frame_ffmpeg_is_empty (&self->current_frame))
{
gdk_paintable_snapshot (GDK_PAINTABLE (self->current_frame.texture), snapshot, width, height);
}
}
static GdkPaintable *
gtk_ff_media_file_paintable_get_current_image (GdkPaintable *paintable)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (paintable);
if (gtk_video_frame_ffmpeg_is_empty (&self->current_frame))
{
if (self->input_video_stream->codec_ctx)
return gdk_paintable_new_empty (self->input_video_stream->codec_ctx->width, self->input_video_stream->codec_ctx->height);
else
return gdk_paintable_new_empty (0, 0);
}
return GDK_PAINTABLE (g_object_ref (self->current_frame.texture));
}
static int
gtk_ff_media_file_paintable_get_intrinsic_width (GdkPaintable *paintable)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (paintable);
if (self->input_video_stream->codec_ctx)
return self->input_video_stream->codec_ctx->width;
return 0;
}
static int
gtk_ff_media_file_paintable_get_intrinsic_height (GdkPaintable *paintable)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (paintable);
if (self->input_video_stream->codec_ctx)
return self->input_video_stream->codec_ctx->height;
return 0;
}
static double gtk_ff_media_file_paintable_get_intrinsic_aspect_ratio (GdkPaintable *paintable)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (paintable);
if (self->input_video_stream->codec_ctx)
return (double) self->input_video_stream->codec_ctx->width / self->input_video_stream->codec_ctx->height;
return 0.0;
};
static void
gtk_ff_media_file_paintable_init (GdkPaintableInterface *iface)
{
iface->snapshot = gtk_ff_media_file_paintable_snapshot;
iface->get_current_image = gtk_ff_media_file_paintable_get_current_image;
iface->get_intrinsic_width = gtk_ff_media_file_paintable_get_intrinsic_width;
iface->get_intrinsic_height = gtk_ff_media_file_paintable_get_intrinsic_height;
iface->get_intrinsic_aspect_ratio = gtk_ff_media_file_paintable_get_intrinsic_aspect_ratio;
}
G_DEFINE_TYPE_EXTENDED (GtkFfMediaFile, gtk_ff_media_file, GTK_TYPE_MEDIA_FILE, 0,
G_IMPLEMENT_INTERFACE (GDK_TYPE_PAINTABLE,
gtk_ff_media_file_paintable_init))
G_MODULE_EXPORT
void
g_io_module_load (GIOModule *module)
{
g_type_module_use (G_TYPE_MODULE (module));
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT (58, 9, 100)
av_register_all ();
#endif
g_io_extension_point_implement (GTK_MEDIA_FILE_EXTENSION_POINT_NAME,
GTK_TYPE_FF_MEDIA_FILE,
"ffmpeg",
0);
}
G_MODULE_EXPORT
G_GNUC_NORETURN
void
g_io_module_unload (GIOModule *module)
{
g_assert_not_reached ();
}
G_MODULE_EXPORT
char **
g_io_module_query (void)
{
char *eps[] = {
(char *) GTK_MEDIA_FILE_EXTENSION_POINT_NAME,
NULL
};
return g_strdupv (eps);
}
static void
gtk_ff_stream_close (GtkFfStream *stream)
{
stream->stream_id = -1;
g_clear_pointer (&stream->codec_ctx, avcodec_close);
g_free (stream);
}
static void
gtk_ff_media_file_set_ffmpeg_error (GtkFfMediaFile *self,
int av_errnum)
{
char s[AV_ERROR_MAX_STRING_SIZE];
if (gtk_media_stream_get_error (GTK_MEDIA_STREAM (self)))
return;
if (av_strerror (av_errnum, s, sizeof (s) != 0))
g_snprintf (s, sizeof (s), _("Unspecified error decoding media"));
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_FAILED,
"%s",
s);
}
static GtkFfStream *
gtk_ff_media_file_find_input_stream (GtkFfMediaFile *self,
int type)
{
GtkFfStream *ff_stream;
const AVCodec *codec;
AVCodecContext *codec_ctx;
AVStream *stream;
int stream_id;
int errnum;
stream_id = av_find_best_stream (self->format_ctx, type, -1, -1, NULL, 0);
if (stream_id < 0)
{
return NULL;
}
stream = self->format_ctx->streams[stream_id];
codec = avcodec_find_decoder (stream->codecpar->codec_id);
if (codec == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("Cannot find decoder: %s"),
avcodec_get_name (stream->codecpar->codec_id));
return NULL;
}
codec_ctx = avcodec_alloc_context3 (codec);
if (codec_ctx == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("Failed to allocate a codec context"));
return NULL;
}
errnum = avcodec_parameters_to_context (codec_ctx, stream->codecpar);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
avcodec_close (codec_ctx);
return NULL;
}
errnum = avcodec_open2 (codec_ctx, codec, &stream->metadata);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
avcodec_close (codec_ctx);
return NULL;
}
ff_stream = g_new (GtkFfStream, 1);
ff_stream->codec_ctx = codec_ctx;
ff_stream->stream = stream;
ff_stream->stream_id = stream_id;
ff_stream->type = type;
return ff_stream;
}
static GtkFfStream *
gtk_ff_media_file_add_output_stream (GtkFfMediaFile *self,
AVFormatContext *fmt_ctx,
enum AVCodecID codec_id)
{
GtkFfStream *ff_media_stream;
const AVCodec *codec;
AVCodecContext *codec_ctx;
AVStream *stream;
int stream_id;
int errnum;
// find the encoder
codec = avcodec_find_encoder (codec_id);
if (codec == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("Cannot find encoder: %s"),
avcodec_get_name (codec_id));
return NULL;
}
stream = avformat_new_stream (fmt_ctx, NULL);
if (stream == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("Cannot add new stream"));
return NULL;
}
stream_id = fmt_ctx->nb_streams - 1;
codec_ctx = avcodec_alloc_context3 (codec);
if (codec_ctx == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("Failed to allocate a codec context"));
return NULL;
}
// set the encoder options
codec_ctx->sample_fmt = codec->sample_fmts ? codec->sample_fmts[0] : AV_SAMPLE_FMT_S16;
codec_ctx->sample_rate = codec->supported_samplerates ? codec->supported_samplerates[0] : 48000;
codec_ctx->channel_layout = codec->channel_layouts ? codec->channel_layouts[0] : AV_CH_LAYOUT_STEREO;
codec_ctx->channels = av_get_channel_layout_nb_channels (codec_ctx->channel_layout);
stream->time_base = (AVRational){ 1, codec_ctx->sample_rate };
// open the codec
errnum = avcodec_open2 (codec_ctx, codec, NULL);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
avcodec_close (codec_ctx);
return NULL;
}
errnum = avcodec_parameters_from_context (stream->codecpar, codec_ctx);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
avcodec_close (codec_ctx);
return NULL;
}
ff_media_stream = g_new (GtkFfStream, 1);
ff_media_stream->codec_ctx = codec_ctx;
ff_media_stream->stream = stream;
ff_media_stream->stream_id = stream_id;
ff_media_stream->type = AVMEDIA_TYPE_AUDIO;
return ff_media_stream;
}
static gboolean
gtk_ff_media_file_seek_stream (GtkFfMediaFile *self, GtkFfStream *stream, int64_t timestamp)
{
int errnum;
if (!stream)
return TRUE;
errnum = av_seek_frame (self->format_ctx,
stream->stream_id,
av_rescale_q (timestamp,
(AVRational){ 1, G_USEC_PER_SEC },
stream->stream->time_base),
AVSEEK_FLAG_BACKWARD);
if (errnum < 0)
{
gtk_media_stream_seek_failed (GTK_MEDIA_STREAM (self));
return FALSE;
}
return TRUE;
}
static AVFrame *
gtk_ff_media_file_alloc_audio_frame (enum AVSampleFormat sample_fmt,
uint64_t channel_layout,
int sample_rate,
int nb_samples)
{
AVFrame *frame = av_frame_alloc ();
int ret;
if (!frame)
{
return NULL;
}
frame->format = sample_fmt;
frame->channel_layout = channel_layout;
frame->sample_rate = sample_rate;
frame->nb_samples = nb_samples;
if (nb_samples)
{
ret = av_frame_get_buffer (frame, 0);
if (ret < 0)
{
return NULL;
}
}
return frame;
}
static void
gtk_ff_media_file_write_audio_frame (GtkFfMediaFile *self, AVFrame* frame)
{
AVFormatContext *device_ctx;
AVCodecContext *codec_ctx;
AVStream *stream;
AVFrame *resampled_frame;
int errnum;
int dst_nb_samples;
device_ctx = self->device_ctx;
codec_ctx = self->output_audio_stream->codec_ctx;
stream = self->output_audio_stream->stream;
if (frame)
{
dst_nb_samples = av_rescale_rnd (swr_get_delay (self->swr_ctx, codec_ctx->sample_rate) + frame->nb_samples,
codec_ctx->sample_rate,
codec_ctx->sample_rate,
AV_ROUND_UP);
resampled_frame = gtk_ff_media_file_alloc_audio_frame (codec_ctx->sample_fmt,
codec_ctx->channel_layout,
codec_ctx->sample_rate,
dst_nb_samples);
if (resampled_frame == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("Failed to allocate an audio frame"));
return;
}
errnum = swr_convert (self->swr_ctx,
resampled_frame->data, dst_nb_samples,
(const uint8_t **) frame->data, frame->nb_samples);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return;
}
frame = resampled_frame;
frame->pts = av_rescale_q (self->audio_samples_count,
(AVRational){ 1, codec_ctx->sample_rate },
codec_ctx->time_base);
errnum = av_write_uncoded_frame (device_ctx, stream->index, frame);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return;
}
self->audio_samples_count += frame->nb_samples;
}
}
static int
gtk_ff_media_file_read_packet_cb (void *data,
uint8_t *buf,
int buf_size)
{
GtkFfMediaFile *self = data;
GError *error = NULL;
gssize n_read;
n_read = g_input_stream_read (self->input_stream,
buf,
buf_size,
NULL,
&error);
if (n_read < 0)
{
gtk_media_stream_gerror (GTK_MEDIA_STREAM (self), error);
}
else if (n_read == 0)
{
n_read = AVERROR_EOF;
}
return n_read;
}
static GdkMemoryFormat
memory_format_from_pix_fmt (enum AVPixelFormat pix_fmt)
{
switch ((int) pix_fmt)
{
case AV_PIX_FMT_RGBA:
return GDK_MEMORY_R8G8B8A8;
case AV_PIX_FMT_RGB24:
return GDK_MEMORY_R8G8B8;
default:
g_assert_not_reached ();
return GDK_MEMORY_R8G8B8A8;
}
}
static gboolean
gtk_ff_media_file_decode_frame (GtkFfMediaFile *self,
GtkVideoFrameFFMpeg *result)
{
GdkTexture *texture;
AVPacket packet;
AVFrame *frame;
int errnum;
GBytes *bytes;
guchar *data;
frame = av_frame_alloc ();
for (errnum = av_read_frame (self->format_ctx, &packet);
errnum >= 0;
errnum = av_read_frame (self->format_ctx, &packet))
{
if (self->input_audio_stream && packet.stream_index == self->input_audio_stream->stream_id)
{
errnum = avcodec_send_packet (self->input_audio_stream->codec_ctx, &packet);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return FALSE;
}
if (errnum >= 0)
{
errnum = avcodec_receive_frame (self->input_audio_stream->codec_ctx, self->audio_frame);
if (errnum == AVERROR (EAGAIN))
{
// Just retry with the next packet
errnum = 0;
continue;
}
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return FALSE;
}
else
{
av_packet_unref (&packet);
}
}
gtk_ff_media_file_write_audio_frame(self, self->audio_frame);
}
else if (self->input_video_stream && packet.stream_index == self->input_video_stream->stream_id)
{
errnum = avcodec_send_packet (self->input_video_stream->codec_ctx, &packet);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return FALSE;
}
if (errnum >= 0)
{
errnum = avcodec_receive_frame (self->input_video_stream->codec_ctx, frame);
if (errnum == AVERROR (EAGAIN))
{
// Just retry with the next packet
errnum = 0;
continue;
}
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return FALSE;
}
else
{
av_packet_unref (&packet);
break;
}
}
}
av_packet_unref (&packet);
}
if (errnum < 0)
{
if (errnum != AVERROR_EOF)
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
av_frame_free (&frame);
return FALSE;
}
data = g_try_malloc0 (self->input_video_stream->codec_ctx->width * self->input_video_stream->codec_ctx->height * 4);
if (data == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_FAILED,
_("Not enough memory"));
av_frame_free (&frame);
return FALSE;
}
if (self->sws_ctx == NULL ||
self->sws_pix_fmt != frame->format)
{
const AVPixFmtDescriptor *desc;
enum AVPixelFormat gdk_pix_fmt;
g_clear_pointer (&self->sws_ctx, sws_freeContext);
self->sws_pix_fmt = frame->format;
desc = av_pix_fmt_desc_get (self->sws_pix_fmt);
/* Use gdk-pixbuf formats because ffmpeg can't premultiply */
if (desc != NULL && (desc->flags & AV_PIX_FMT_FLAG_ALPHA))
gdk_pix_fmt = AV_PIX_FMT_RGBA;
else
gdk_pix_fmt = AV_PIX_FMT_RGB24;
self->sws_ctx = sws_getContext (self->input_video_stream->codec_ctx->width,
self->input_video_stream->codec_ctx->height,
frame->format,
self->input_video_stream->codec_ctx->width,
self->input_video_stream->codec_ctx->height,
gdk_pix_fmt,
0,
NULL,
NULL,
NULL);
self->memory_format = memory_format_from_pix_fmt (gdk_pix_fmt);
}
sws_scale(self->sws_ctx,
(const uint8_t * const *) frame->data, frame->linesize,
0, self->input_video_stream->codec_ctx->height,
(uint8_t *[1]) { data }, (int[1]) { self->input_video_stream->codec_ctx->width * 4 });
bytes = g_bytes_new_take (data, self->input_video_stream->codec_ctx->width * self->input_video_stream->codec_ctx->height * 4);
texture = gdk_memory_texture_new (self->input_video_stream->codec_ctx->width,
self->input_video_stream->codec_ctx->height,
self->memory_format,
bytes,
self->input_video_stream->codec_ctx->width * 4);
g_bytes_unref (bytes);
gtk_video_frame_ffmpeg_init (result,
texture,
av_rescale_q (frame->best_effort_timestamp,
self->input_video_stream->stream->time_base,
(AVRational) { 1, G_USEC_PER_SEC }));
av_frame_free (&frame);
return TRUE;
}
static int64_t
gtk_ff_media_file_seek_cb (void *data,
int64_t offset,
int whence)
{
GtkFfMediaFile *self = data;
GSeekType seek_type;
gboolean result;
switch (whence)
{
case SEEK_SET:
seek_type = G_SEEK_SET;
break;
case SEEK_CUR:
seek_type = G_SEEK_CUR;
break;
case SEEK_END:
seek_type = G_SEEK_END;
break;
case AVSEEK_SIZE:
/* FIXME: Handle size querying */
return -1;
default:
g_assert_not_reached ();
return -1;
}
result = g_seekable_seek (G_SEEKABLE (self->input_stream),
offset,
seek_type,
NULL,
NULL);
if (!result)
return -1;
return g_seekable_tell (G_SEEKABLE (self->input_stream));
}
static gboolean
gtk_ff_media_file_create_input_stream (GtkFfMediaFile *self)
{
GError *error = NULL;
GFile *file;
file = gtk_media_file_get_file (GTK_MEDIA_FILE (self));
if (file)
{
self->input_stream = G_INPUT_STREAM (g_file_read (file, NULL, &error));
if (self->input_stream == NULL)
{
gtk_media_stream_gerror (GTK_MEDIA_STREAM (self), error);
g_error_free (error);
return FALSE;
}
}
else
{
self->input_stream = g_object_ref (gtk_media_file_get_input_stream (GTK_MEDIA_FILE (self)));
}
return TRUE;
}
static AVIOContext *
gtk_ff_media_file_create_io_context (GtkFfMediaFile *self)
{
AVIOContext *result;
int buffer_size = 4096; /* it's what everybody else uses... */
unsigned char *buffer;
if (!gtk_ff_media_file_create_input_stream (self))
return NULL;
buffer = av_malloc (buffer_size);
if (buffer == NULL)
return NULL;
result = avio_alloc_context (buffer,
buffer_size,
AVIO_FLAG_READ,
self,
gtk_ff_media_file_read_packet_cb,
NULL,
G_IS_SEEKABLE (self->input_stream)
? gtk_ff_media_file_seek_cb
: NULL);
result->buf_ptr = result->buf_end;
result->write_flag = 0;
return result;
}
static gboolean
gtk_ff_media_file_init_audio_resampler (GtkFfMediaFile *self)
{
AVCodecContext *in_codec_ctx = self->input_audio_stream->codec_ctx;
AVCodecContext *out_codec_ctx = self->output_audio_stream->codec_ctx;
int errnum;
// create resampler context
self->swr_ctx = swr_alloc ();
if (!self->swr_ctx)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("Could not allocate resampler context"));
return FALSE;
}
// set resampler option
av_opt_set_int (self->swr_ctx, "in_channel_count", in_codec_ctx->channels, 0);
av_opt_set_int (self->swr_ctx, "in_sample_rate", in_codec_ctx->sample_rate, 0);
av_opt_set_sample_fmt (self->swr_ctx, "in_sample_fmt", in_codec_ctx->sample_fmt, 0);
av_opt_set_int (self->swr_ctx, "out_channel_count", out_codec_ctx->channels, 0);
av_opt_set_int (self->swr_ctx, "out_sample_rate", out_codec_ctx->sample_rate, 0);
av_opt_set_sample_fmt (self->swr_ctx, "out_sample_fmt", out_codec_ctx->sample_fmt, 0);
// initialize the resampling context
errnum = swr_init (self->swr_ctx);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return FALSE;
}
return TRUE;
}
static gboolean
gtk_ff_media_file_open_audio_device (GtkFfMediaFile *self)
{
const AVOutputFormat *candidate;
int errnum;
/* Try finding an audio device that supports setting the volume */
for (candidate = av_output_audio_device_next (NULL);
candidate != NULL;
candidate = av_output_audio_device_next (candidate))
{
if (candidate->control_message)
break;
}
/* fallback to the first format available */
if (candidate == NULL)
candidate = av_output_audio_device_next (NULL);
if (candidate == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_ ("No audio output found"));
return FALSE;
}
errnum = avformat_alloc_output_context2 (&self->device_ctx, candidate, NULL, NULL);
if (errnum != 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return FALSE;
}
return TRUE;
}
static gboolean gtk_ff_media_file_play (GtkMediaStream *stream);
static void
gtk_ff_media_file_open (GtkMediaFile *file)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (file);
int errnum;
int nb_samples;
self->format_ctx = avformat_alloc_context ();
self->format_ctx->pb = gtk_ff_media_file_create_io_context (self);
if (self->format_ctx->pb == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_FAILED,
_("Not enough memory"));
return;
}
errnum = avformat_open_input (&self->format_ctx, NULL, NULL, NULL);
if (errnum != 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return;
}
errnum = avformat_find_stream_info (self->format_ctx, NULL);
if (errnum < 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return;
}
self->input_audio_stream = gtk_ff_media_file_find_input_stream (self, AVMEDIA_TYPE_AUDIO);
self->input_video_stream = gtk_ff_media_file_find_input_stream (self, AVMEDIA_TYPE_VIDEO);
// open an audio device when we have an audio stream
if (self->input_audio_stream && gtk_ff_media_file_open_audio_device (self))
{
self->output_audio_stream = gtk_ff_media_file_add_output_stream (self,
self->device_ctx,
self->device_ctx->oformat->audio_codec);
gtk_ff_media_file_init_audio_resampler (self);
if (self->output_audio_stream->codec_ctx->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE)
nb_samples = 10000; // just taken from the ffmpeg muxing example
else
nb_samples = self->output_audio_stream->codec_ctx->frame_size;
self->audio_frame = gtk_ff_media_file_alloc_audio_frame (self->output_audio_stream->codec_ctx->sample_fmt,
self->output_audio_stream->codec_ctx->channel_layout,
self->output_audio_stream->codec_ctx->sample_rate,
nb_samples);
if (self->audio_frame == NULL)
{
gtk_media_stream_error (GTK_MEDIA_STREAM (self),
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("Failed to allocate an audio frame"));
return;
}
errnum = avformat_write_header (self->device_ctx, NULL);
if (errnum != 0)
{
gtk_ff_media_file_set_ffmpeg_error (self, errnum);
return;
}
}
gtk_media_stream_stream_prepared (GTK_MEDIA_STREAM (self),
self->output_audio_stream != NULL,
self->input_video_stream != NULL,
TRUE,
self->format_ctx->duration != AV_NOPTS_VALUE
? av_rescale (self->format_ctx->duration, G_USEC_PER_SEC, AV_TIME_BASE)
: 0);
gdk_paintable_invalidate_size (GDK_PAINTABLE (self));
if (gtk_ff_media_file_decode_frame (self, &self->current_frame))
gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
if (gtk_media_stream_get_playing (GTK_MEDIA_STREAM (self)))
gtk_ff_media_file_play (GTK_MEDIA_STREAM (self));
}
static void
gtk_ff_media_file_close (GtkMediaFile *file)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (file);
g_clear_object (&self->input_stream);
g_clear_pointer (&self->swr_ctx, swr_close);
g_clear_pointer (&self->sws_ctx, sws_freeContext);
g_clear_pointer (&self->input_audio_stream, gtk_ff_stream_close);
g_clear_pointer (&self->input_video_stream, gtk_ff_stream_close);
g_clear_pointer (&self->output_audio_stream, gtk_ff_stream_close);
av_frame_free (&self->audio_frame);
avformat_free_context(self->device_ctx);
avformat_close_input (&self->format_ctx);
gtk_video_frame_ffmpeg_clear (&self->next_frame);
gtk_video_frame_ffmpeg_clear (&self->current_frame);
gdk_paintable_invalidate_size (GDK_PAINTABLE (self));
gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
}
static gboolean
gtk_ff_media_file_next_frame_cb (gpointer data);
static void
gtk_ff_media_file_queue_frame (GtkFfMediaFile *self)
{
gint64 time, frame_time;
guint delay;
time = g_get_monotonic_time ();
frame_time = self->start_time + self->next_frame.timestamp;
delay = time > frame_time ? 0 : (frame_time - time) / 1000;
self->next_frame_cb = g_timeout_add (delay, gtk_ff_media_file_next_frame_cb, self);
}
static gboolean
gtk_ff_media_file_restart (GtkFfMediaFile *self)
{
if (!gtk_ff_media_file_seek_stream (self, self->input_audio_stream, 0))
return FALSE;
if (!gtk_ff_media_file_seek_stream (self, self->input_video_stream, 0))
return FALSE;
if (!gtk_ff_media_file_decode_frame (self, &self->next_frame))
return FALSE;
return TRUE;
}
static gboolean
gtk_ff_media_file_next_frame_cb (gpointer data)
{
GtkFfMediaFile *self = data;
self->next_frame_cb = 0;
if (gtk_video_frame_ffmpeg_is_empty (&self->next_frame))
{
if (!gtk_media_stream_get_loop (GTK_MEDIA_STREAM (self)) ||
!gtk_ff_media_file_restart (self))
{
gtk_media_stream_stream_ended (GTK_MEDIA_STREAM (self));
return G_SOURCE_REMOVE;
}
self->start_time += self->current_frame.timestamp - self->next_frame.timestamp;
}
gtk_video_frame_ffmpeg_clear (&self->current_frame);
gtk_video_frame_ffmpeg_move (&self->current_frame,
&self->next_frame);
gtk_media_stream_update (GTK_MEDIA_STREAM (self),
self->current_frame.timestamp);
gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
/* ignore failure here, we'll handle the empty frame case above
* the next time we're called. */
gtk_ff_media_file_decode_frame (self, &self->next_frame);
gtk_ff_media_file_queue_frame (self);
return G_SOURCE_REMOVE;
}
static gboolean
gtk_ff_media_file_play (GtkMediaStream *stream)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (stream);
if (self->format_ctx == NULL)
return FALSE;
if (!gtk_media_stream_is_prepared (stream))
return TRUE;
if (gtk_video_frame_ffmpeg_is_empty (&self->next_frame) &&
!gtk_ff_media_file_decode_frame (self, &self->next_frame))
{
if (gtk_ff_media_file_restart (self))
{
self->start_time = g_get_monotonic_time () - self->next_frame.timestamp;
}
else
{
return FALSE;
}
}
else
{
self->start_time = g_get_monotonic_time () - self->current_frame.timestamp;
}
gtk_ff_media_file_queue_frame (self);
return TRUE;
}
static void
gtk_ff_media_file_pause (GtkMediaStream *stream)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (stream);
if (self->next_frame_cb)
{
g_source_remove (self->next_frame_cb);
self->next_frame_cb = 0;
}
self->start_time = 0;
}
static void
gtk_ff_media_file_seek (GtkMediaStream *stream,
gint64 timestamp)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (stream);
if (!gtk_ff_media_file_seek_stream (self, self->input_audio_stream, timestamp))
return;
if (!gtk_ff_media_file_seek_stream (self, self->input_video_stream, timestamp))
return;
gtk_media_stream_seek_success (stream);
gtk_video_frame_ffmpeg_clear (&self->next_frame);
gtk_video_frame_ffmpeg_clear (&self->current_frame);
if (gtk_ff_media_file_decode_frame (self, &self->current_frame))
gtk_media_stream_update (stream, self->current_frame.timestamp);
gdk_paintable_invalidate_contents (GDK_PAINTABLE (self));
if (gtk_media_stream_get_playing (stream))
{
gtk_ff_media_file_pause (stream);
if (!gtk_ff_media_file_play (stream))
gtk_media_stream_stream_ended (stream);
}
}
static void
gtk_ff_media_file_update_audio (GtkMediaStream *stream,
gboolean muted,
double volume)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (stream);
int errnum;
errnum = avdevice_app_to_dev_control_message (self->device_ctx, muted ? AV_APP_TO_DEV_MUTE : AV_APP_TO_DEV_UNMUTE, NULL, 0);
if (errnum < 0)
{
g_warning ("Cannot set audio mute state");
}
errnum = avdevice_app_to_dev_control_message (self->device_ctx, AV_APP_TO_DEV_SET_VOLUME, &volume, sizeof (volume));
if (errnum < 0)
{
g_warning ("Cannot set audio volume");
}
}
static void
gtk_ff_media_file_dispose (GObject *object)
{
GtkFfMediaFile *self = GTK_FF_MEDIA_FILE (object);
gtk_ff_media_file_pause (GTK_MEDIA_STREAM (self));
gtk_ff_media_file_close (GTK_MEDIA_FILE (self));
G_OBJECT_CLASS (gtk_ff_media_file_parent_class)->dispose (object);
}
static void
gtk_ff_media_file_class_init (GtkFfMediaFileClass *klass)
{
GtkMediaFileClass *file_class = GTK_MEDIA_FILE_CLASS (klass);
GtkMediaStreamClass *stream_class = GTK_MEDIA_STREAM_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
file_class->open = gtk_ff_media_file_open;
file_class->close = gtk_ff_media_file_close;
stream_class->play = gtk_ff_media_file_play;
stream_class->pause = gtk_ff_media_file_pause;
stream_class->seek = gtk_ff_media_file_seek;
stream_class->update_audio = gtk_ff_media_file_update_audio;
gobject_class->dispose = gtk_ff_media_file_dispose;
}
static void
gtk_ff_media_file_init (GtkFfMediaFile *self)
{
}
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