examples/am7xxx-play.c

   1 /*
   2  * am7xxx-play - play stuff on an am7xxx device (e.g. Acer C110, PicoPix 1020)
   3  *
   4  * Copyright (C) 2012-2014  Antonio Ospite <ao2@ao2.it>
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 /**
  21  * @example examples/am7xxx-play.c
  22  * am7xxx-play uses libavdevice, libavformat, libavcodec and libswscale to
  23  * decode the input, encode it to jpeg and display it with libam7xxx.
  24  */
  25
  26 #include <stdio.h>
  27 #include <stdint.h>
  28 #include <string.h>
  29 #include <signal.h>
  30 #include <getopt.h>
  31
  32 #include <libavdevice/avdevice.h>
  33 #include <libavformat/avformat.h>
  34 #include <libavutil/imgutils.h>
  35 #include <libswscale/swscale.h>
  36
  37 #include <am7xxx.h>
  38
  39 static unsigned int run = 1;
  40
  41 struct video_input_ctx {
  42         AVFormatContext *format_ctx;
  43         AVCodecContext  *codec_ctx;
  44         int video_stream_index;
  45 };
  46
  47 static int video_input_init(struct video_input_ctx *input_ctx,
  48                             const char *input_format_string,
  49                             const char *input_path,
  50                             AVDictionary **input_options)
  51 {
  52         AVInputFormat *input_format = NULL;
  53         AVFormatContext *input_format_ctx;
  54         AVCodecParameters *input_codec_params;
  55         AVCodecContext *input_codec_ctx;
  56         AVCodec *input_codec;
  57         int video_index;
  58         int ret;
  59
  60         avdevice_register_all();
  61         avcodec_register_all();
  62         av_register_all();
  63
  64         if (input_format_string) {
  65                 /* find the desired input format */
  66                 input_format = av_find_input_format(input_format_string);
  67                 if (input_format == NULL) {
  68                         fprintf(stderr, "cannot find input format\n");
  69                         ret = -ENODEV;
  70                         goto out;
  71                 }
  72         }
  73
  74         if (input_path == NULL) {
  75                 fprintf(stderr, "input_path must not be NULL!\n");
  76                 ret = -EINVAL;
  77                 goto out;
  78         }
  79
  80         /* open the input format/device */
  81         input_format_ctx = NULL;
  82         ret = avformat_open_input(&input_format_ctx,
  83                                   input_path,
  84                                   input_format,
  85                                   input_options);
  86         if (ret < 0) {
  87                 fprintf(stderr, "cannot open input format/device\n");
  88                 goto out;
  89         }
  90
  91         /* get information on the input stream (e.g. format, bitrate, framerate) */
  92         ret = avformat_find_stream_info(input_format_ctx, NULL);
  93         if (ret < 0) {
  94                 fprintf(stderr, "cannot get information on the stream\n");
  95                 goto cleanup;
  96         }
  97
  98         /* dump what was found */
  99         av_dump_format(input_format_ctx, 0, input_path, 0);
 100
 101         /* look for the first video_stream */
 102         video_index = av_find_best_stream(input_format_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &input_codec, 0);
 103         if (video_index < 0) {
 104                 fprintf(stderr, "cannot find any video streams\n");
 105                 ret = -EINVAL;
 106                 goto cleanup;
 107         }
 108
 109         input_codec_ctx = avcodec_alloc_context3(input_codec);
 110         if (input_codec_ctx == NULL) {
 111                 fprintf(stderr, "failed to allocate the input codec context\n");
 112                 ret = -ENOMEM;
 113                 goto cleanup;
 114         }
 115
 116         input_codec_params = input_format_ctx->streams[video_index]->codecpar;
 117         ret = avcodec_parameters_to_context(input_codec_ctx, input_codec_params);
 118         if (ret < 0) {
 119                 fprintf(stderr, "cannot copy parameters to input codec context\n");
 120                 goto cleanup_ctx;
 121         }
 122
 123         /* open the decoder */
 124         ret = avcodec_open2(input_codec_ctx, input_codec, NULL);
 125         if (ret < 0) {
 126                 fprintf(stderr, "cannot open input codec\n");
 127                 goto cleanup_ctx;
 128         }
 129
 130         input_ctx->format_ctx = input_format_ctx;
 131         input_ctx->codec_ctx = input_codec_ctx;
 132         input_ctx->video_stream_index = video_index;
 133
 134         ret = 0;
 135         goto out;
 136
 137 cleanup_ctx:
 138         avcodec_free_context(&input_codec_ctx);
 139 cleanup:
 140         avformat_close_input(&input_format_ctx);
 141 out:
 142         av_dict_free(input_options);
 143         *input_options = NULL;
 144         return ret;
 145 }
 146
 147
 148 struct video_output_ctx {
 149         AVCodecContext  *codec_ctx;
 150         int raw_output;
 151 };
 152
 153 static int video_output_init(struct video_output_ctx *output_ctx,
 154                              struct video_input_ctx *input_ctx,
 155                              unsigned int upscale,
 156                              unsigned int quality,
 157                              am7xxx_image_format image_format,
 158                              am7xxx_device *dev)
 159 {
 160         AVCodecContext *output_codec_ctx;
 161         AVCodec *output_codec;
 162         unsigned int new_output_width;
 163         unsigned int new_output_height;
 164         int ret;
 165
 166         if (input_ctx == NULL) {
 167                 fprintf(stderr, "input_ctx must not be NULL!\n");
 168                 ret = -EINVAL;
 169                 goto out;
 170         }
 171
 172         /* create the encoder context */
 173         output_codec_ctx = avcodec_alloc_context3(NULL);
 174         if (output_codec_ctx == NULL) {
 175                 fprintf(stderr, "cannot allocate output codec context!\n");
 176                 ret = -ENOMEM;
 177                 goto out;
 178         }
 179
 180         /* Calculate the new output dimension so the original frame is shown
 181          * in its entirety */
 182         ret = am7xxx_calc_scaled_image_dimensions(dev,
 183                                                   upscale,
 184                                                   (input_ctx->codec_ctx)->width,
 185                                                   (input_ctx->codec_ctx)->height,
 186                                                   &new_output_width,
 187                                                   &new_output_height);
 188         if (ret < 0) {
 189                 fprintf(stderr, "cannot calculate output dimension\n");
 190                 goto cleanup;
 191         }
 192
 193         /* put sample parameters */
 194         output_codec_ctx->bit_rate   = (input_ctx->codec_ctx)->bit_rate;
 195         output_codec_ctx->width      = new_output_width;
 196         output_codec_ctx->height     = new_output_height;
 197         output_codec_ctx->time_base.num  =
 198                 (input_ctx->format_ctx)->streams[input_ctx->video_stream_index]->time_base.num;
 199         output_codec_ctx->time_base.den  =
 200                 (input_ctx->format_ctx)->streams[input_ctx->video_stream_index]->time_base.den;
 201
 202         /* When the raw format is requested we don't actually need to setup
 203          * and open a decoder
 204          */
 205         if (image_format == AM7XXX_IMAGE_FORMAT_NV12) {
 206                 fprintf(stdout, "using raw output format\n");
 207                 output_codec_ctx->pix_fmt    = AV_PIX_FMT_NV12;
 208                 output_ctx->codec_ctx = output_codec_ctx;
 209                 output_ctx->raw_output = 1;
 210                 ret = 0;
 211                 goto out;
 212         }
 213
 214         output_codec_ctx->pix_fmt    = AV_PIX_FMT_YUVJ420P;
 215         output_codec_ctx->codec_id   = AV_CODEC_ID_MJPEG;
 216         output_codec_ctx->codec_type = AVMEDIA_TYPE_VIDEO;
 217
 218         /* Set quality and other VBR settings */
 219
 220         /* @note: 'quality' is expected to be between 1 and 100, but a value
 221          * between 0 to 99 has to be passed when calculating qmin and qmax.
 222          * This way qmin and qmax will cover the range 1-FF_QUALITY_SCALE, and
 223          * in particular they won't be 0, this is needed because they are used
 224          * as divisor somewhere in the encoding process */
 225         output_codec_ctx->qmin       = output_codec_ctx->qmax = ((100 - (quality - 1)) * FF_QUALITY_SCALE) / 100;
 226         output_codec_ctx->mb_lmin    = output_codec_ctx->qmin * FF_QP2LAMBDA;
 227         output_codec_ctx->mb_lmax    = output_codec_ctx->qmax * FF_QP2LAMBDA;
 228         output_codec_ctx->flags      |= AV_CODEC_FLAG_QSCALE;
 229         output_codec_ctx->global_quality = output_codec_ctx->qmin * FF_QP2LAMBDA;
 230
 231         /* find the encoder */
 232         output_codec = avcodec_find_encoder(output_codec_ctx->codec_id);
 233         if (output_codec == NULL) {
 234                 fprintf(stderr, "cannot find output codec!\n");
 235                 ret = -EINVAL;
 236                 goto cleanup;
 237         }
 238
 239         /* open the codec */
 240         ret = avcodec_open2(output_codec_ctx, output_codec, NULL);
 241         if (ret < 0) {
 242                 fprintf(stderr, "could not open output codec!\n");
 243                 goto cleanup;
 244         }
 245
 246         output_ctx->codec_ctx = output_codec_ctx;
 247         output_ctx->raw_output = 0;
 248
 249         ret = 0;
 250         goto out;
 251
 252 cleanup:
 253         avcodec_free_context(&output_codec_ctx);
 254 out:
 255         return ret;
 256 }
 257
 258
 259 /*
 260  * Wrap the new avcodec API from FFMpeg 3.1 to minimize the changes in the
 261  * user code.
 262  *
 263  * If the use of the wrappers were to be made conditional, a check like the
 264  * following could be used:
 265  *
 266  *      #if (LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 48, 101))
 267  *
 268  * As derived from the APIchanges document:
 269  * https://github.com/FFmpeg/FFmpeg/blob/master/doc/APIchanges
 270  *
 271  * The wrapper implementation has been taken from:
 272  * https://blogs.gentoo.org/lu_zero/2016/03/29/new-avcodec-api/
 273  */
 274 static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
 275 {
 276         int ret;
 277
 278         *got_frame = 0;
 279
 280         if (pkt) {
 281                 ret = avcodec_send_packet(avctx, pkt);
 282                 /*
 283                  * In particular, we don't expect AVERROR(EAGAIN), because we
 284                  * read all decoded frames with avcodec_receive_frame() until
 285                  * done.
 286                  */
 287                 if (ret < 0)
 288                         return ret == AVERROR_EOF ? 0 : ret;
 289         }
 290
 291         ret = avcodec_receive_frame(avctx, frame);
 292         if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
 293                 return ret;
 294         if (ret >= 0)
 295                 *got_frame = 1;
 296
 297         return 0;
 298 }
 299
 300 static int encode(AVCodecContext *avctx, AVPacket *pkt, int *got_packet, AVFrame *frame)
 301 {
 302         int ret;
 303
 304         *got_packet = 0;
 305
 306         ret = avcodec_send_frame(avctx, frame);
 307         if (ret < 0)
 308                 return ret;
 309
 310         ret = avcodec_receive_packet(avctx, pkt);
 311         if (!ret)
 312                 *got_packet = 1;
 313         if (ret == AVERROR(EAGAIN))
 314                 return 0;
 315
 316         return ret;
 317 }
 318
 319
 320 static int am7xxx_play(const char *input_format_string,
 321                        AVDictionary **input_options,
 322                        const char *input_path,
 323                        unsigned int rescale_method,
 324                        unsigned int upscale,
 325                        unsigned int quality,
 326                        am7xxx_image_format image_format,
 327                        am7xxx_device *dev,
 328                        int dump_frame)
 329 {
 330         struct video_input_ctx input_ctx;
 331         struct video_output_ctx output_ctx;
 332         AVFrame *frame_raw;
 333         AVFrame *frame_scaled;
 334         int out_buf_size;
 335         uint8_t *out_buf;
 336         int out_frame_size;
 337         uint8_t *out_frame;
 338         struct SwsContext *sw_scale_ctx;
 339         AVPacket in_packet;
 340         AVPacket out_packet;
 341         int got_frame;
 342         int got_packet;
 343         int ret;
 344
 345         ret = video_input_init(&input_ctx, input_format_string, input_path, input_options);
 346         if (ret < 0) {
 347                 fprintf(stderr, "cannot initialize input\n");
 348                 goto out;
 349         }
 350
 351         ret = video_output_init(&output_ctx, &input_ctx, upscale, quality, image_format, dev);
 352         if (ret < 0) {
 353                 fprintf(stderr, "cannot initialize input\n");
 354                 goto cleanup_input;
 355         }
 356
 357         /* allocate an input frame */
 358         frame_raw = av_frame_alloc();
 359         if (frame_raw == NULL) {
 360                 fprintf(stderr, "cannot allocate the raw frame!\n");
 361                 ret = -ENOMEM;
 362                 goto cleanup_output;
 363         }
 364
 365         /* allocate output frame */
 366         frame_scaled = av_frame_alloc();
 367         if (frame_scaled == NULL) {
 368                 fprintf(stderr, "cannot allocate the scaled frame!\n");
 369                 ret = -ENOMEM;
 370                 goto cleanup_frame_raw;
 371         }
 372         frame_scaled->format = (output_ctx.codec_ctx)->pix_fmt;
 373         frame_scaled->width = (output_ctx.codec_ctx)->width;
 374         frame_scaled->height = (output_ctx.codec_ctx)->height;
 375
 376         /* calculate the bytes needed for the output image and create buffer for the output image */
 377         out_buf_size = av_image_get_buffer_size((output_ctx.codec_ctx)->pix_fmt,
 378                                                 (output_ctx.codec_ctx)->width,
 379                                                 (output_ctx.codec_ctx)->height,
 380                                                 1);
 381         out_buf = av_malloc(out_buf_size * sizeof(uint8_t));
 382         if (out_buf == NULL) {
 383                 fprintf(stderr, "cannot allocate output data buffer!\n");
 384                 ret = -ENOMEM;
 385                 goto cleanup_frame_scaled;
 386         }
 387
 388         /* assign appropriate parts of buffer to image planes in frame_scaled */
 389         av_image_fill_arrays(frame_scaled->data,
 390                              frame_scaled->linesize,
 391                              out_buf,
 392                              (output_ctx.codec_ctx)->pix_fmt,
 393                              (output_ctx.codec_ctx)->width,
 394                              (output_ctx.codec_ctx)->height,
 395                              1);
 396
 397         sw_scale_ctx = sws_getCachedContext(NULL,
 398                                             (input_ctx.codec_ctx)->width,
 399                                             (input_ctx.codec_ctx)->height,
 400                                             (input_ctx.codec_ctx)->pix_fmt,
 401                                             (output_ctx.codec_ctx)->width,
 402                                             (output_ctx.codec_ctx)->height,
 403                                             (output_ctx.codec_ctx)->pix_fmt,
 404                                             rescale_method,
 405                                             NULL, NULL, NULL);
 406         if (sw_scale_ctx == NULL) {
 407                 fprintf(stderr, "cannot set up the rescaling context!\n");
 408                 ret = -EINVAL;
 409                 goto cleanup_out_buf;
 410         }
 411
 412         got_packet = 0;
 413         while (run) {
 414                 /* read packet */
 415                 ret = av_read_frame(input_ctx.format_ctx, &in_packet);
 416                 if (ret < 0) {
 417                         if (ret == (int)AVERROR_EOF || input_ctx.format_ctx->pb->eof_reached)
 418                                 ret = 0;
 419                         else
 420                                 fprintf(stderr, "av_read_frame failed, EOF?\n");
 421                         run = 0;
 422                         goto end_while;
 423                 }
 424
 425                 if (in_packet.stream_index != input_ctx.video_stream_index) {
 426                         /* that is more or less a "continue", but there is
 427                          * still the packet to free */
 428                         goto end_while;
 429                 }
 430
 431                 /* decode */
 432                 got_frame = 0;
 433                 ret = decode(input_ctx.codec_ctx, frame_raw, &got_frame, &in_packet);
 434                 if (ret < 0) {
 435                         fprintf(stderr, "cannot decode video\n");
 436                         run = 0;
 437                         goto end_while;
 438                 }
 439
 440                 /* if we got the complete frame */
 441                 if (got_frame) {
 442                         /*
 443                          * Rescaling the frame also changes its pixel format
 444                          * to the raw format supported by the projector if
 445                          * this was set in video_output_init()
 446                          */
 447                         sws_scale(sw_scale_ctx,
 448                                   (const uint8_t * const *)frame_raw->data,
 449                                   frame_raw->linesize,
 450                                   0,
 451                                   (input_ctx.codec_ctx)->height,
 452                                   frame_scaled->data,
 453                                   frame_scaled->linesize);
 454
 455                         if (output_ctx.raw_output) {
 456                                 out_frame = out_buf;
 457                                 out_frame_size = out_buf_size;
 458                         } else {
 459                                 frame_scaled->quality = (output_ctx.codec_ctx)->global_quality;
 460                                 av_init_packet(&out_packet);
 461                                 out_packet.data = NULL;
 462                                 out_packet.size = 0;
 463                                 got_packet = 0;
 464                                 ret = encode(output_ctx.codec_ctx,
 465                                              &out_packet,
 466                                              &got_packet,
 467                                              frame_scaled);
 468                                 if (ret < 0 || !got_packet) {
 469                                         fprintf(stderr, "cannot encode video\n");
 470                                         run = 0;
 471                                         goto end_while;
 472                                 }
 473
 474                                 out_frame = out_packet.data;
 475                                 out_frame_size = out_packet.size;
 476                         }
 477
 478 #ifdef DEBUG
 479                         if (dump_frame) {
 480                                 char filename[NAME_MAX];
 481                                 FILE *file;
 482                                 if (!output_ctx.raw_output)
 483                                         snprintf(filename, NAME_MAX, "out_q%03d.jpg", quality);
 484                                 else
 485                                         snprintf(filename, NAME_MAX, "out.raw");
 486                                 file = fopen(filename, "wb");
 487                                 fwrite(out_frame, 1, out_frame_size, file);
 488                                 fclose(file);
 489                         }
 490 #else
 491                         (void) dump_frame;
 492 #endif
 493
 494                         ret = am7xxx_send_image_async(dev,
 495                                                       image_format,
 496                                                       (output_ctx.codec_ctx)->width,
 497                                                       (output_ctx.codec_ctx)->height,
 498                                                       out_frame,
 499                                                       out_frame_size);
 500                         if (ret < 0) {
 501                                 perror("am7xxx_send_image_async");
 502                                 run = 0;
 503                                 goto end_while;
 504                         }
 505                 }
 506 end_while:
 507                 if (!output_ctx.raw_output && got_packet)
 508                         av_packet_unref(&out_packet);
 509                 av_packet_unref(&in_packet);
 510         }
 511
 512         sws_freeContext(sw_scale_ctx);
 513 cleanup_out_buf:
 514         av_free(out_buf);
 515 cleanup_frame_scaled:
 516         av_frame_free(&frame_scaled);
 517 cleanup_frame_raw:
 518         av_frame_free(&frame_raw);
 519
 520 cleanup_output:
 521         /* Freeing the codec context is needed as well,
 522          * see https://libav.org/documentation/doxygen/master/group__lavc__core.html#gaf4daa92361efb3523ef5afeb0b54077f
 523          */
 524         avcodec_close(output_ctx.codec_ctx);
 525         avcodec_free_context(&(output_ctx.codec_ctx));
 526
 527 cleanup_input:
 528         avcodec_close(input_ctx.codec_ctx);
 529         avcodec_free_context(&(input_ctx.codec_ctx));
 530         avformat_close_input(&(input_ctx.format_ctx));
 531
 532 out:
 533         return ret;
 534 }
 535
 536 #ifdef HAVE_XCB
 537 #include <xcb/xcb.h>
 538 static int x_get_screen_dimensions(const char *displayname, int *width, int *height)
 539 {
 540         int i, screen_number;
 541         xcb_connection_t *connection;
 542         const xcb_setup_t *setup;
 543         xcb_screen_iterator_t iter;
 544
 545         connection = xcb_connect(displayname, &screen_number);
 546         if (xcb_connection_has_error(connection)) {
 547                 fprintf(stderr, "Cannot open a connection to %s\n", displayname);
 548                 return -EINVAL;
 549         }
 550
 551         setup = xcb_get_setup(connection);
 552         if (setup == NULL) {
 553                 fprintf(stderr, "Cannot get setup for %s\n", displayname);
 554                 xcb_disconnect(connection);
 555                 return -EINVAL;
 556         }
 557
 558         iter = xcb_setup_roots_iterator(setup);
 559         for (i = 0; i < screen_number; ++i) {
 560                 xcb_screen_next(&iter);
 561         }
 562
 563         xcb_screen_t *screen = iter.data;
 564
 565         *width = screen->width_in_pixels;
 566         *height = screen->height_in_pixels;
 567
 568         xcb_disconnect(connection);
 569
 570         return 0;
 571 }
 572
 573 static char *get_x_screen_size(const char *input_path)
 574 {
 575         int len;
 576         int width;
 577         int height;
 578         char *screen_size;
 579         int ret;
 580
 581         ret = x_get_screen_dimensions(input_path, &width, &height);
 582         if (ret < 0) {
 583                 fprintf(stderr, "Cannot get screen dimensions for %s\n", input_path);
 584                 return NULL;
 585         }
 586
 587         len = snprintf(NULL, 0, "%dx%d", width, height);
 588
 589         screen_size = malloc((len + 1) * sizeof(char));
 590         if (screen_size == NULL) {
 591                 perror("malloc");
 592                 return NULL;
 593         }
 594
 595         len = snprintf(screen_size, len + 1, "%dx%d", width, height);
 596         if (len < 0) {
 597                 free(screen_size);
 598                 screen_size = NULL;
 599                 return NULL;
 600         }
 601         return screen_size;
 602 }
 603 #else
 604 static char *get_x_screen_size(const char *input_path)
 605 {
 606         (void) input_path;
 607         fprintf(stderr, "%s: fallback implementation, assuming a vga screen\n", __func__);
 608         return strdup("vga");
 609 }
 610 #endif
 611
 612 static void unset_run(int signo)
 613 {
 614         (void) signo;
 615         run = 0;
 616 }
 617
 618 #ifdef HAVE_SIGACTION
 619 static int set_signal_handler(void (*signal_handler)(int))
 620 {
 621         struct sigaction new_action;
 622         struct sigaction old_action;
 623         int ret;
 624
 625         new_action.sa_handler = signal_handler;
 626         sigemptyset(&new_action.sa_mask);
 627         new_action.sa_flags = 0;
 628
 629         ret = sigaction(SIGINT, NULL, &old_action);
 630         if (ret < 0) {
 631                 perror("sigaction on old_action");
 632                 goto out;
 633         }
 634
 635         if (old_action.sa_handler != SIG_IGN) {
 636                 ret = sigaction(SIGINT, &new_action, NULL);
 637                 if (ret < 0) {
 638                         perror("sigaction on new_action");
 639                         goto out;
 640                 }
 641         }
 642
 643 out:
 644         return ret;
 645 }
 646 #else
 647 static int set_signal_handler(void (*signal_handler)(int))
 648 {
 649         (void)signal_handler;
 650         fprintf(stderr, "set_signal_handler() not implemented, sigaction not available\n");
 651         return 0;
 652 }
 653 #endif
 654
 655
 656 static void usage(char *name)
 657 {
 658         printf("usage: %s [OPTIONS]\n\n", name);
 659         printf("OPTIONS:\n");
 660         printf("\t-d <index>\t\tthe device index (default is 0)\n");
 661 #ifdef DEBUG
 662         printf("\t-D \t\t\tdump the last frame to a file (only active in DEBUG mode)\n");
 663 #endif
 664         printf("\t-f <input format>\tthe input device format\n");
 665         printf("\t-i <input path>\t\tthe input path\n");
 666         printf("\t-o <options>\t\ta comma separated list of input format options\n");
 667         printf("\t\t\t\tEXAMPLE:\n");
 668         printf("\t\t\t\t\t-o draw_mouse=1,framerate=100,video_size=800x480\n");
 669         printf("\t-s <scaling method>\tthe rescaling method (see swscale.h)\n");
 670         printf("\t-u \t\t\tupscale the image if smaller than the display dimensions\n");
 671         printf("\t-F <format>\t\tthe image format to use (default is JPEG)\n");
 672         printf("\t\t\t\tSUPPORTED FORMATS:\n");
 673         printf("\t\t\t\t\t1 - JPEG\n");
 674         printf("\t\t\t\t\t2 - NV12\n");
 675         printf("\t-q <quality>\t\tquality of jpeg sent to the device, between 1 and 100\n");
 676         printf("\t-l <log level>\t\tthe verbosity level of libam7xxx output (0-5)\n");
 677         printf("\t-p <power mode>\t\tthe power mode of device, between %d (off) and %d (turbo)\n",
 678                AM7XXX_POWER_OFF, AM7XXX_POWER_TURBO);
 679         printf("\t\t\t\tWARNING: Level 2 and greater require the master AND\n");
 680         printf("\t\t\t\t         the slave connector to be plugged in.\n");
 681         printf("\t-z <zoom mode>\t\tthe display zoom mode, between %d (original) and %d (tele)\n",
 682                AM7XXX_ZOOM_ORIGINAL, AM7XXX_ZOOM_TELE);
 683         printf("\t-h \t\t\tthis help message\n");
 684         printf("\n\nEXAMPLES OF USE:\n");
 685         printf("\t%s -f x11grab -i :0.0 -o video_size=800x480\n", name);
 686         printf("\t%s -f fbdev -i /dev/fb0\n", name);
 687         printf("\t%s -f video4linux2 -i /dev/video0 -o video_size=320x240,frame_rate=100 -u -q 90\n", name);
 688         printf("\t%s -i http://download.blender.org/peach/bigbuckbunny_movies/BigBuckBunny_640x360.m4v\n", name);
 689 }
 690
 691 int main(int argc, char *argv[])
 692 {
 693         int ret;
 694         int opt;
 695         char *subopts;
 696         char *subopts_saved;
 697         char *subopt;
 698         char *input_format_string = NULL;
 699         AVDictionary *options = NULL;
 700         char *input_path = NULL;
 701         unsigned int rescale_method = SWS_BICUBIC;
 702         unsigned int upscale = 0;
 703         unsigned int quality = 95;
 704         int log_level = AM7XXX_LOG_INFO;
 705         int device_index = 0;
 706         int power_mode = AM7XXX_POWER_LOW;
 707         int zoom = AM7XXX_ZOOM_ORIGINAL;
 708         int format = AM7XXX_IMAGE_FORMAT_JPEG;
 709         am7xxx_context *ctx;
 710         am7xxx_device *dev;
 711         int dump_frame = 0;
 712
 713         while ((opt = getopt(argc, argv, "d:Df:i:o:s:uF:q:l:p:z:h")) != -1) {
 714                 switch (opt) {
 715                 case 'd':
 716                         device_index = atoi(optarg);
 717                         if (device_index < 0) {
 718                                 fprintf(stderr, "Unsupported device index\n");
 719                                 ret = -EINVAL;
 720                                 goto out;
 721                         }
 722                         break;
 723                 case 'D':
 724                         dump_frame = 1;
 725 #ifndef DEBUG
 726                         fprintf(stderr, "Warning: the -D option is only active in DEBUG mode.\n");
 727 #endif
 728                         break;
 729                 case 'f':
 730                         input_format_string = strdup(optarg);
 731                         break;
 732                 case 'i':
 733                         input_path = strdup(optarg);
 734                         break;
 735                 case 'o':
 736 #ifdef HAVE_STRTOK_R
 737                         /*
 738                          * parse suboptions, the expected format is something
 739                          * like:
 740                          *   draw_mouse=1,framerate=100,video_size=800x480
 741                          */
 742                         subopts = subopts_saved = strdup(optarg);
 743                         while ((subopt = strtok_r(subopts, ",", &subopts))) {
 744                                 char *subopt_name = strtok_r(subopt, "=", &subopt);
 745                                 char *subopt_value = strtok_r(NULL, "", &subopt);
 746                                 if (subopt_value == NULL) {
 747                                         fprintf(stderr, "invalid suboption: %s\n", subopt_name);
 748                                         continue;
 749                                 }
 750                                 av_dict_set(&options, subopt_name, subopt_value, 0);
 751                         }
 752                         free(subopts_saved);
 753 #else
 754                         fprintf(stderr, "Option '-o' not implemented\n");
 755 #endif
 756                         break;
 757                 case 's':
 758                         rescale_method = atoi(optarg);
 759                         switch(rescale_method) {
 760                         case SWS_FAST_BILINEAR:
 761                         case SWS_BILINEAR:
 762                         case SWS_BICUBIC:
 763                         case SWS_X:
 764                         case SWS_POINT:
 765                         case SWS_AREA:
 766                         case SWS_BICUBLIN:
 767                         case SWS_GAUSS:
 768                         case SWS_SINC:
 769                         case SWS_LANCZOS:
 770                         case SWS_SPLINE:
 771                                 break;
 772                         default:
 773                                 fprintf(stderr, "Unsupported rescale method\n");
 774                                 ret = -EINVAL;
 775                                 goto out;
 776                         }
 777                         break;
 778                 case 'u':
 779                         upscale = 1;
 780                         break;
 781                 case 'F':
 782                         format = atoi(optarg);
 783                         switch(format) {
 784                         case AM7XXX_IMAGE_FORMAT_JPEG:
 785                                 fprintf(stdout, "JPEG format\n");
 786                                 break;
 787                         case AM7XXX_IMAGE_FORMAT_NV12:
 788                                 fprintf(stdout, "NV12 format\n");
 789                                 break;
 790                         default:
 791                                 fprintf(stderr, "Unsupported format\n");
 792                                 ret = -EINVAL;
 793                                 goto out;
 794                         }
 795                         break;
 796                 case 'q':
 797                         quality = atoi(optarg);
 798                         if (quality < 1 || quality > 100) {
 799                                 fprintf(stderr, "Invalid quality value, must be between 1 and 100\n");
 800                                 ret = -EINVAL;
 801                                 goto out;
 802                         }
 803                         break;
 804                 case 'l':
 805                         log_level = atoi(optarg);
 806                         if (log_level < AM7XXX_LOG_FATAL || log_level > AM7XXX_LOG_TRACE) {
 807                                 fprintf(stderr, "Unsupported log level, falling back to AM7XXX_LOG_ERROR\n");
 808                                 log_level = AM7XXX_LOG_ERROR;
 809                         }
 810                         break;
 811                 case 'p':
 812                         power_mode = atoi(optarg);
 813                         switch(power_mode) {
 814                         case AM7XXX_POWER_OFF:
 815                         case AM7XXX_POWER_LOW:
 816                         case AM7XXX_POWER_MIDDLE:
 817                         case AM7XXX_POWER_HIGH:
 818                         case AM7XXX_POWER_TURBO:
 819                                 fprintf(stdout, "Power mode: %d\n", power_mode);
 820                                 break;
 821                         default:
 822                                 fprintf(stderr, "Invalid power mode value, must be between %d and %d\n",
 823                                         AM7XXX_POWER_OFF, AM7XXX_POWER_TURBO);
 824                                 ret = -EINVAL;
 825                                 goto out;
 826                         }
 827                         break;
 828                 case 'z':
 829                         zoom = atoi(optarg);
 830                         switch(zoom) {
 831                         case AM7XXX_ZOOM_ORIGINAL:
 832                         case AM7XXX_ZOOM_H:
 833                         case AM7XXX_ZOOM_H_V:
 834                         case AM7XXX_ZOOM_TEST:
 835                         case AM7XXX_ZOOM_TELE:
 836                                 fprintf(stdout, "Zoom: %d\n", zoom);
 837                                 break;
 838                         default:
 839                                 fprintf(stderr, "Invalid zoom mode value, must be between %d and %d\n",
 840                                         AM7XXX_ZOOM_ORIGINAL, AM7XXX_ZOOM_TELE);
 841                                 ret = -EINVAL;
 842                                 goto out;
 843                         }
 844                         break;
 845                 case 'h':
 846                         usage(argv[0]);
 847                         ret = 0;
 848                         goto out;
 849                 default: /* '?' */
 850                         usage(argv[0]);
 851                         ret = -EINVAL;
 852                         goto out;
 853                 }
 854         }
 855
 856         if (input_path == NULL) {
 857                 fprintf(stderr, "The -i option must always be passed\n\n");
 858                 usage(argv[0]);
 859                 ret = -EINVAL;
 860                 goto out;
 861         }
 862
 863         /*
 864          * When the input format is 'x11grab' set some useful fallback options
 865          * if not supplied by the user, in particular grab full screen
 866          */
 867         if (input_format_string && strcmp(input_format_string, "x11grab") == 0) {
 868                 char *video_size;
 869
 870                 video_size = get_x_screen_size(input_path);
 871
 872                 if (!av_dict_get(options, "video_size", NULL, 0))
 873                         av_dict_set(&options, "video_size", video_size, 0);
 874
 875                 if (!av_dict_get(options, "framerate", NULL, 0))
 876                         av_dict_set(&options, "framerate", "60", 0);
 877
 878                 if (!av_dict_get(options, "draw_mouse", NULL, 0))
 879                         av_dict_set(&options, "draw_mouse",  "1", 0);
 880
 881                 free(video_size);
 882         }
 883
 884         ret = set_signal_handler(unset_run);
 885         if (ret < 0) {
 886                 perror("sigaction");
 887                 goto out;
 888         }
 889
 890         ret = am7xxx_init(&ctx);
 891         if (ret < 0) {
 892                 perror("am7xxx_init");
 893                 goto out;
 894         }
 895
 896         am7xxx_set_log_level(ctx, log_level);
 897
 898         ret = am7xxx_open_device(ctx, &dev, device_index);
 899         if (ret < 0) {
 900                 perror("am7xxx_open_device");
 901                 goto cleanup;
 902         }
 903
 904         ret = am7xxx_set_zoom_mode(dev, zoom);
 905         if (ret < 0) {
 906                 perror("am7xxx_set_zoom_mode");
 907                 goto cleanup;
 908         }
 909
 910         ret = am7xxx_set_power_mode(dev, power_mode);
 911         if (ret < 0) {
 912                 perror("am7xxx_set_power_mode");
 913                 goto cleanup;
 914         }
 915
 916         /* When setting AM7XXX_ZOOM_TEST don't display the actual image */
 917         if (zoom == AM7XXX_ZOOM_TEST)
 918                 goto cleanup;
 919
 920         ret = am7xxx_play(input_format_string,
 921                           &options,
 922                           input_path,
 923                           rescale_method,
 924                           upscale,
 925                           quality,
 926                           format,
 927                           dev,
 928                           dump_frame);
 929         if (ret < 0) {
 930                 fprintf(stderr, "am7xxx_play failed\n");
 931                 goto cleanup;
 932         }
 933
 934 cleanup:
 935         am7xxx_shutdown(ctx);
 936 out:
 937         av_dict_free(&options);
 938         free(input_path);
 939         free(input_format_string);
 940         return ret;
 941 }