/*
  * This file is part of FFmpeg.
  *
  * FFmpeg 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.
  *
  * FFmpeg 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 FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #include "libavutil/avassert.h"

 #include "libavutil/samplefmt.h"
 #include "libavutil/pixfmt.h"
 #include "libavcodec/avcodec.h"

 #include "avdevice.h"

 #include "config.h"

 #include "libavutil/ffversion.h"
 const char av_device_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
 

 #define E AV_OPT_FLAG_ENCODING_PARAM
 #define D AV_OPT_FLAG_DECODING_PARAM
 #define A AV_OPT_FLAG_AUDIO_PARAM
 #define V AV_OPT_FLAG_VIDEO_PARAM
 #define OFFSET(x) offsetof(AVDeviceCapabilitiesQuery, x)
 
 const AVOption av_device_capabilities[] = {
     { "codec", "codec", OFFSET(codec), AV_OPT_TYPE_INT,
         {.i64 = AV_CODEC_ID_NONE}, AV_CODEC_ID_NONE, INT_MAX, E|D|A|V },
     { "sample_format", "sample format", OFFSET(sample_format), AV_OPT_TYPE_INT,
         {.i64 = AV_SAMPLE_FMT_NONE}, -1, INT_MAX, E|D|A },
     { "sample_rate", "sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT,
         {.i64 = -1}, -1, INT_MAX, E|D|A },
     { "channels", "channels", OFFSET(channels), AV_OPT_TYPE_INT,
         {.i64 = -1}, -1, INT_MAX, E|D|A },
     { "channel_layout", "channel layout", OFFSET(channel_layout), AV_OPT_TYPE_INT64,
         {.i64 = -1}, -1, INT_MAX, E|D|A },
     { "pixel_format", "pixel format", OFFSET(pixel_format), AV_OPT_TYPE_INT,
         {.i64 = AV_PIX_FMT_NONE}, -1, INT_MAX, E|D|V },
     { "window_size", "window size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE,
         {.str = NULL}, -1, INT_MAX, E|D|V },
     { "frame_size", "frame size", OFFSET(frame_width), AV_OPT_TYPE_IMAGE_SIZE,
         {.str = NULL}, -1, INT_MAX, E|D|V },
     { "fps", "fps", OFFSET(fps), AV_OPT_TYPE_RATIONAL,
         {.dbl = -1}, -1, INT_MAX, E|D|V },
     { NULL }
 };
 
 #undef E
 #undef D
 #undef A
 #undef V
 #undef OFFSET
 

 unsigned avdevice_version(void)
 {

     av_assert0(LIBAVDEVICE_VERSION_MICRO >= 100);

     return LIBAVDEVICE_VERSION_INT;
 }

 
 const char * avdevice_configuration(void)
 {

     return FFMPEG_CONFIGURATION;

 }
 
 const char * avdevice_license(void)
 {
 #define LICENSE_PREFIX "libavdevice license: "

     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;

 }

 static void *av_device_next(void *prev, int output,
                             AVClassCategory c1, AVClassCategory c2)
 {
     const AVClass *pc;
     AVClassCategory category = AV_CLASS_CATEGORY_NA;
     do {
         if (output) {
             if (!(prev = av_oformat_next(prev)))
                 break;
             pc = ((AVOutputFormat *)prev)->priv_class;
         } else {
             if (!(prev = av_iformat_next(prev)))
                 break;
             pc = ((AVInputFormat *)prev)->priv_class;
         }
         if (!pc)
             continue;
         category = pc->category;
     } while (category != c1 && category != c2);
     return prev;
 }
 
 AVInputFormat *av_input_audio_device_next(AVInputFormat  *d)
 {
     return av_device_next(d, 0, AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
                           AV_CLASS_CATEGORY_DEVICE_INPUT);
 }
 
 AVInputFormat *av_input_video_device_next(AVInputFormat  *d)
 {
     return av_device_next(d, 0, AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
                           AV_CLASS_CATEGORY_DEVICE_INPUT);
 }
 
 AVOutputFormat *av_output_audio_device_next(AVOutputFormat *d)
 {
     return av_device_next(d, 1, AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
                           AV_CLASS_CATEGORY_DEVICE_OUTPUT);
 }
 
 AVOutputFormat *av_output_video_device_next(AVOutputFormat *d)
 {
     return av_device_next(d, 1, AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
                           AV_CLASS_CATEGORY_DEVICE_OUTPUT);
 }
 

 int avdevice_app_to_dev_control_message(struct AVFormatContext *s, enum AVAppToDevMessageType type,
                                         void *data, size_t data_size)
 {
     if (!s->oformat || !s->oformat->control_message)
         return AVERROR(ENOSYS);
     return s->oformat->control_message(s, type, data, data_size);
 }

 
 int avdevice_dev_to_app_control_message(struct AVFormatContext *s, enum AVDevToAppMessageType type,
                                         void *data, size_t data_size)
 {
     if (!s->control_message_cb)
         return AVERROR(ENOSYS);
     return s->control_message_cb(s, type, data, data_size);
 }

 int avdevice_capabilities_create(AVDeviceCapabilitiesQuery **caps, AVFormatContext *s,
                                  AVDictionary **device_options)
 {
     int ret;
     av_assert0(s && caps);
     av_assert0(s->iformat || s->oformat);
     if ((s->oformat && !s->oformat->create_device_capabilities) ||
         (s->iformat && !s->iformat->create_device_capabilities))
         return AVERROR(ENOSYS);
     *caps = av_mallocz(sizeof(**caps));
     if (!(*caps))
         return AVERROR(ENOMEM);
     (*caps)->device_context = s;
     if (((ret = av_opt_set_dict(s->priv_data, device_options)) < 0))
         goto fail;
     if (s->iformat) {
         if ((ret = s->iformat->create_device_capabilities(s, *caps)) < 0)
             goto fail;
     } else {
         if ((ret = s->oformat->create_device_capabilities(s, *caps)) < 0)
             goto fail;
     }
     av_opt_set_defaults(*caps);
     return 0;
   fail:
     av_freep(caps);
     return ret;
 }
 
 void avdevice_capabilities_free(AVDeviceCapabilitiesQuery **caps, AVFormatContext *s)
 {
     if (!s || !caps || !(*caps))
         return;
     av_assert0(s->iformat || s->oformat);
     if (s->iformat) {
         if (s->iformat->free_device_capabilities)
             s->iformat->free_device_capabilities(s, *caps);
     } else {
         if (s->oformat->free_device_capabilities)
             s->oformat->free_device_capabilities(s, *caps);
     }
     av_freep(caps);
 }
 

 int avdevice_list_devices(AVFormatContext *s, AVDeviceInfoList **device_list)
 {

     int ret;

     av_assert0(s);
     av_assert0(device_list);
     av_assert0(s->oformat || s->iformat);
     if ((s->oformat && !s->oformat->get_device_list) ||
         (s->iformat && !s->iformat->get_device_list)) {
         *device_list = NULL;
         return AVERROR(ENOSYS);
     }
     *device_list = av_mallocz(sizeof(AVDeviceInfoList));
     if (!(*device_list))
         return AVERROR(ENOMEM);

     /* no default device by default */
     (*device_list)->default_device = -1;

     if (s->oformat)

         ret = s->oformat->get_device_list(s, *device_list);
     else
         ret = s->iformat->get_device_list(s, *device_list);
     if (ret < 0)
         avdevice_free_list_devices(device_list);
     return ret;

 }
 
 void avdevice_free_list_devices(AVDeviceInfoList **device_list)
 {
     AVDeviceInfoList *list;
     AVDeviceInfo *dev;
     int i;
 
     av_assert0(device_list);
     list = *device_list;
     if (!list)
         return;
 
     for (i = 0; i < list->nb_devices; i++) {
         dev = list->devices[i];
         if (dev) {

             av_freep(&dev->device_name);
             av_freep(&dev->device_description);

             av_free(dev);
         }
     }

     av_freep(&list->devices);

     av_freep(device_list);
 }