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  1. /*
  2.  * Dirac decoder support via Schroedinger libraries
  3.  * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com >
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23. * @file
  24. * Dirac decoder support via libschroedinger-1.0 libraries. More details about
  25. * the Schroedinger project can be found at http://www.diracvideo.org/.
  26. * The library implements Dirac Specification Version 2.2.
  27. * (http://dirac.sourceforge.net/specification.html).
  28. */
  29.  
  30. #include <string.h>
  31.  
  32. #include "libavutil/imgutils.h"
  33. #include "libavutil/internal.h"
  34. #include "libavutil/intreadwrite.h"
  35. #include "libavutil/mem.h"
  36. #include "avcodec.h"
  37. #include "internal.h"
  38. #include "libschroedinger.h"
  39.  
  40. #include <schroedinger/schro.h>
  41. #include <schroedinger/schrodebug.h>
  42. #include <schroedinger/schrovideoformat.h>
  43.  
  44. /** SchroFrame and Pts relation */
  45. typedef struct LibSchroFrameContext {
  46.      SchroFrame *frame;
  47.      int64_t pts;
  48. } LibSchroFrameContext;
  49.  
  50. /** libschroedinger decoder private data */
  51. typedef struct SchroDecoderParams {
  52.     /** Schroedinger video format */
  53.     SchroVideoFormat *format;
  54.  
  55.     /** Schroedinger frame format */
  56.     SchroFrameFormat frame_format;
  57.  
  58.     /** decoder handle */
  59.     SchroDecoder* decoder;
  60.  
  61.     /** queue storing decoded frames */
  62.     FFSchroQueue dec_frame_queue;
  63.  
  64.     /** end of sequence signalled */
  65.     int eos_signalled;
  66.  
  67.     /** end of sequence pulled */
  68.     int eos_pulled;
  69. } SchroDecoderParams;
  70.  
  71. typedef struct SchroParseUnitContext {
  72.     const uint8_t *buf;
  73.     int           buf_size;
  74. } SchroParseUnitContext;
  75.  
  76.  
  77. static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf,
  78.                                                void *priv)
  79. {
  80.     av_freep(&priv);
  81. }
  82.  
  83. static void parse_context_init(SchroParseUnitContext *parse_ctx,
  84.                                const uint8_t *buf, int buf_size)
  85. {
  86.     parse_ctx->buf           = buf;
  87.     parse_ctx->buf_size      = buf_size;
  88. }
  89.  
  90. static SchroBuffer *find_next_parse_unit(SchroParseUnitContext *parse_ctx)
  91. {
  92.     SchroBuffer *enc_buf = NULL;
  93.     int next_pu_offset = 0;
  94.     unsigned char *in_buf;
  95.  
  96.     if (parse_ctx->buf_size < 13 ||
  97.         parse_ctx->buf[0] != 'B' ||
  98.         parse_ctx->buf[1] != 'B' ||
  99.         parse_ctx->buf[2] != 'C' ||
  100.         parse_ctx->buf[3] != 'D')
  101.         return NULL;
  102.  
  103.     next_pu_offset = (parse_ctx->buf[5] << 24) +
  104.                      (parse_ctx->buf[6] << 16) +
  105.                      (parse_ctx->buf[7] <<  8) +
  106.                       parse_ctx->buf[8];
  107.  
  108.     if (next_pu_offset == 0 &&
  109.         SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4]))
  110.         next_pu_offset = 13;
  111.  
  112.     if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset)
  113.         return NULL;
  114.  
  115.     in_buf = av_malloc(next_pu_offset);
  116.     if (!in_buf) {
  117.         av_log(parse_ctx, AV_LOG_ERROR, "Unable to allocate input buffer\n");
  118.         return NULL;
  119.     }
  120.  
  121.     memcpy(in_buf, parse_ctx->buf, next_pu_offset);
  122.     enc_buf       = schro_buffer_new_with_data(in_buf, next_pu_offset);
  123.     enc_buf->free = libschroedinger_decode_buffer_free;
  124.     enc_buf->priv = in_buf;
  125.  
  126.     parse_ctx->buf      += next_pu_offset;
  127.     parse_ctx->buf_size -= next_pu_offset;
  128.  
  129.     return enc_buf;
  130. }
  131.  
  132. /**
  133. * Returns FFmpeg chroma format.
  134. */
  135. static enum AVPixelFormat get_chroma_format(SchroChromaFormat schro_pix_fmt)
  136. {
  137.     int num_formats = sizeof(schro_pixel_format_map) /
  138.                       sizeof(schro_pixel_format_map[0]);
  139.     int idx;
  140.  
  141.     for (idx = 0; idx < num_formats; ++idx)
  142.         if (schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt)
  143.             return schro_pixel_format_map[idx].ff_pix_fmt;
  144.     return AV_PIX_FMT_NONE;
  145. }
  146.  
  147. static av_cold int libschroedinger_decode_init(AVCodecContext *avctx)
  148. {
  149.  
  150.     SchroDecoderParams *p_schro_params = avctx->priv_data;
  151.     /* First of all, initialize our supporting libraries. */
  152.     schro_init();
  153.  
  154.     schro_debug_set_level(avctx->debug);
  155.     p_schro_params->decoder = schro_decoder_new();
  156.     schro_decoder_set_skip_ratio(p_schro_params->decoder, 1);
  157.  
  158.     if (!p_schro_params->decoder)
  159.         return -1;
  160.  
  161.     /* Initialize the decoded frame queue. */
  162.     ff_schro_queue_init(&p_schro_params->dec_frame_queue);
  163.     return 0;
  164. }
  165.  
  166. static void libschroedinger_decode_frame_free(void *frame)
  167. {
  168.     schro_frame_unref(frame);
  169. }
  170.  
  171. static void libschroedinger_handle_first_access_unit(AVCodecContext *avctx)
  172. {
  173.     SchroDecoderParams *p_schro_params = avctx->priv_data;
  174.     SchroDecoder *decoder = p_schro_params->decoder;
  175.  
  176.     p_schro_params->format = schro_decoder_get_video_format(decoder);
  177.  
  178.     /* Tell FFmpeg about sequence details. */
  179.     if (av_image_check_size(p_schro_params->format->width,
  180.                             p_schro_params->format->height, 0, avctx) < 0) {
  181.         av_log(avctx, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n",
  182.                p_schro_params->format->width, p_schro_params->format->height);
  183.         avctx->height = avctx->width = 0;
  184.         return;
  185.     }
  186.     avctx->height  = p_schro_params->format->height;
  187.     avctx->width   = p_schro_params->format->width;
  188.     avctx->pix_fmt = get_chroma_format(p_schro_params->format->chroma_format);
  189.  
  190.     if (ff_get_schro_frame_format(p_schro_params->format->chroma_format,
  191.                                   &p_schro_params->frame_format) == -1) {
  192.         av_log(avctx, AV_LOG_ERROR,
  193.                "This codec currently only supports planar YUV 4:2:0, 4:2:2 "
  194.                "and 4:4:4 formats.\n");
  195.         return;
  196.     }
  197.  
  198.     avctx->time_base.den = p_schro_params->format->frame_rate_numerator;
  199.     avctx->time_base.num = p_schro_params->format->frame_rate_denominator;
  200. }
  201.  
  202. static int libschroedinger_decode_frame(AVCodecContext *avctx,
  203.                                         void *data, int *got_frame,
  204.                                         AVPacket *avpkt)
  205. {
  206.     const uint8_t *buf = avpkt->data;
  207.     int buf_size = avpkt->size;
  208.     int64_t pts  = avpkt->pts;
  209.     SchroTag *tag;
  210.  
  211.     SchroDecoderParams *p_schro_params = avctx->priv_data;
  212.     SchroDecoder *decoder = p_schro_params->decoder;
  213.     SchroBuffer *enc_buf;
  214.     SchroFrame* frame;
  215.     AVFrame *avframe = data;
  216.     int state;
  217.     int go = 1;
  218.     int outer = 1;
  219.     SchroParseUnitContext parse_ctx;
  220.     LibSchroFrameContext *framewithpts = NULL;
  221.  
  222.     *got_frame = 0;
  223.  
  224.     parse_context_init(&parse_ctx, buf, buf_size);
  225.     if (!buf_size) {
  226.         if (!p_schro_params->eos_signalled) {
  227.             state = schro_decoder_push_end_of_stream(decoder);
  228.             p_schro_params->eos_signalled = 1;
  229.         }
  230.     }
  231.  
  232.     /* Loop through all the individual parse units in the input buffer */
  233.     do {
  234.         if ((enc_buf = find_next_parse_unit(&parse_ctx))) {
  235.             /* Set Schrotag with the pts to be recovered after decoding*/
  236.             enc_buf->tag = schro_tag_new(av_malloc(sizeof(int64_t)), av_free);
  237.             if (!enc_buf->tag->value) {
  238.                 av_log(avctx, AV_LOG_ERROR, "Unable to allocate SchroTag\n");
  239.                 return AVERROR(ENOMEM);
  240.             }
  241.             AV_WN(64, enc_buf->tag->value, pts);
  242.             /* Push buffer into decoder. */
  243.             if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) &&
  244.                 SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0)
  245.                 avctx->has_b_frames = 1;
  246.             state = schro_decoder_push(decoder, enc_buf);
  247.             if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT)
  248.                 libschroedinger_handle_first_access_unit(avctx);
  249.             go = 1;
  250.         } else
  251.             outer = 0;
  252.  
  253.         while (go) {
  254.             /* Parse data and process result. */
  255.             state = schro_decoder_wait(decoder);
  256.             switch (state) {
  257.             case SCHRO_DECODER_FIRST_ACCESS_UNIT:
  258.                 libschroedinger_handle_first_access_unit(avctx);
  259.                 break;
  260.  
  261.             case SCHRO_DECODER_NEED_BITS:
  262.                 /* Need more input data - stop iterating over what we have. */
  263.                 go = 0;
  264.                 break;
  265.  
  266.             case SCHRO_DECODER_NEED_FRAME:
  267.                 /* Decoder needs a frame - create one and push it in. */
  268.                 frame = ff_create_schro_frame(avctx,
  269.                                               p_schro_params->frame_format);
  270.                 schro_decoder_add_output_picture(decoder, frame);
  271.                 break;
  272.  
  273.             case SCHRO_DECODER_OK:
  274.                 /* Pull a frame out of the decoder. */
  275.                 tag   = schro_decoder_get_picture_tag(decoder);
  276.                 frame = schro_decoder_pull(decoder);
  277.  
  278.                 if (frame) {
  279.                     /* Add relation between schroframe and pts. */
  280.                     framewithpts = av_malloc(sizeof(LibSchroFrameContext));
  281.                     if (!framewithpts) {
  282.                         av_log(avctx, AV_LOG_ERROR, "Unable to allocate FrameWithPts\n");
  283.                         return AVERROR(ENOMEM);
  284.                     }
  285.                     framewithpts->frame = frame;
  286.                     framewithpts->pts   = AV_RN64(tag->value);
  287.                     ff_schro_queue_push_back(&p_schro_params->dec_frame_queue,
  288.                                              framewithpts);
  289.                 }
  290.                 break;
  291.             case SCHRO_DECODER_EOS:
  292.                 go = 0;
  293.                 p_schro_params->eos_pulled = 1;
  294.                 schro_decoder_reset(decoder);
  295.                 outer = 0;
  296.                 break;
  297.  
  298.             case SCHRO_DECODER_ERROR:
  299.                 return -1;
  300.                 break;
  301.             }
  302.         }
  303.     } while (outer);
  304.  
  305.     /* Grab next frame to be returned from the top of the queue. */
  306.     framewithpts = ff_schro_queue_pop(&p_schro_params->dec_frame_queue);
  307.  
  308.     if (framewithpts && framewithpts->frame) {
  309.         int ret;
  310.  
  311.         if ((ret = ff_get_buffer(avctx, avframe, 0)) < 0)
  312.             return ret;
  313.  
  314.         memcpy(avframe->data[0],
  315.                framewithpts->frame->components[0].data,
  316.                framewithpts->frame->components[0].length);
  317.  
  318.         memcpy(avframe->data[1],
  319.                framewithpts->frame->components[1].data,
  320.                framewithpts->frame->components[1].length);
  321.  
  322.         memcpy(avframe->data[2],
  323.                framewithpts->frame->components[2].data,
  324.                framewithpts->frame->components[2].length);
  325.  
  326.         /* Fill frame with current buffer data from Schroedinger. */
  327.         avframe->pkt_pts = framewithpts->pts;
  328.         avframe->linesize[0] = framewithpts->frame->components[0].stride;
  329.         avframe->linesize[1] = framewithpts->frame->components[1].stride;
  330.         avframe->linesize[2] = framewithpts->frame->components[2].stride;
  331.  
  332.         *got_frame      = 1;
  333.  
  334.         /* Now free the frame resources. */
  335.         libschroedinger_decode_frame_free(framewithpts->frame);
  336.         av_free(framewithpts);
  337.     } else {
  338.         data       = NULL;
  339.         *got_frame = 0;
  340.     }
  341.     return buf_size;
  342. }
  343.  
  344.  
  345. static av_cold int libschroedinger_decode_close(AVCodecContext *avctx)
  346. {
  347.     SchroDecoderParams *p_schro_params = avctx->priv_data;
  348.     /* Free the decoder. */
  349.     schro_decoder_free(p_schro_params->decoder);
  350.     av_freep(&p_schro_params->format);
  351.  
  352.     /* Free data in the output frame queue. */
  353.     ff_schro_queue_free(&p_schro_params->dec_frame_queue,
  354.                         libschroedinger_decode_frame_free);
  355.  
  356.     return 0;
  357. }
  358.  
  359. static void libschroedinger_flush(AVCodecContext *avctx)
  360. {
  361.     /* Got a seek request. Free the decoded frames queue and then reset
  362.      * the decoder */
  363.     SchroDecoderParams *p_schro_params = avctx->priv_data;
  364.  
  365.     /* Free data in the output frame queue. */
  366.     ff_schro_queue_free(&p_schro_params->dec_frame_queue,
  367.                         libschroedinger_decode_frame_free);
  368.  
  369.     ff_schro_queue_init(&p_schro_params->dec_frame_queue);
  370.     schro_decoder_reset(p_schro_params->decoder);
  371.     p_schro_params->eos_pulled = 0;
  372.     p_schro_params->eos_signalled = 0;
  373. }
  374.  
  375. AVCodec ff_libschroedinger_decoder = {
  376.     .name           = "libschroedinger",
  377.     .long_name      = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
  378.     .type           = AVMEDIA_TYPE_VIDEO,
  379.     .id             = AV_CODEC_ID_DIRAC,
  380.     .priv_data_size = sizeof(SchroDecoderParams),
  381.     .init           = libschroedinger_decode_init,
  382.     .close          = libschroedinger_decode_close,
  383.     .decode         = libschroedinger_decode_frame,
  384.     .capabilities   = CODEC_CAP_DELAY,
  385.     .flush          = libschroedinger_flush,
  386. };
  387.