diff options
Diffstat (limited to 'ffmpeg/libavcodec/libschroedingerdec.c')
| -rw-r--r-- | ffmpeg/libavcodec/libschroedingerdec.c | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/libschroedingerdec.c b/ffmpeg/libavcodec/libschroedingerdec.c new file mode 100644 index 0000000..2e0ce5d --- /dev/null +++ b/ffmpeg/libavcodec/libschroedingerdec.c @@ -0,0 +1,386 @@ +/* + * Dirac decoder support via Schroedinger libraries + * Copyright (c) 2008 BBC, Anuradha Suraparaju <asuraparaju at gmail dot com > + * + * 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 + */ + +/** +* @file +* Dirac decoder support via libschroedinger-1.0 libraries. More details about +* the Schroedinger project can be found at http://www.diracvideo.org/. +* The library implements Dirac Specification Version 2.2. +* (http://dirac.sourceforge.net/specification.html). +*/ + +#include <string.h> + +#include "libavutil/imgutils.h" +#include "libavutil/internal.h" +#include "libavutil/intreadwrite.h" +#include "libavutil/mem.h" +#include "avcodec.h" +#include "internal.h" +#include "libschroedinger.h" + +#include <schroedinger/schro.h> +#include <schroedinger/schrodebug.h> +#include <schroedinger/schrovideoformat.h> + +/** SchroFrame and Pts relation */ +typedef struct LibSchroFrameContext { + SchroFrame *frame; + int64_t pts; +} LibSchroFrameContext; + +/** libschroedinger decoder private data */ +typedef struct SchroDecoderParams { + /** Schroedinger video format */ + SchroVideoFormat *format; + + /** Schroedinger frame format */ + SchroFrameFormat frame_format; + + /** decoder handle */ + SchroDecoder* decoder; + + /** queue storing decoded frames */ + FFSchroQueue dec_frame_queue; + + /** end of sequence signalled */ + int eos_signalled; + + /** end of sequence pulled */ + int eos_pulled; +} SchroDecoderParams; + +typedef struct SchroParseUnitContext { + const uint8_t *buf; + int buf_size; +} SchroParseUnitContext; + + +static void libschroedinger_decode_buffer_free(SchroBuffer *schro_buf, + void *priv) +{ + av_freep(&priv); +} + +static void parse_context_init(SchroParseUnitContext *parse_ctx, + const uint8_t *buf, int buf_size) +{ + parse_ctx->buf = buf; + parse_ctx->buf_size = buf_size; +} + +static SchroBuffer *find_next_parse_unit(SchroParseUnitContext *parse_ctx) +{ + SchroBuffer *enc_buf = NULL; + int next_pu_offset = 0; + unsigned char *in_buf; + + if (parse_ctx->buf_size < 13 || + parse_ctx->buf[0] != 'B' || + parse_ctx->buf[1] != 'B' || + parse_ctx->buf[2] != 'C' || + parse_ctx->buf[3] != 'D') + return NULL; + + next_pu_offset = (parse_ctx->buf[5] << 24) + + (parse_ctx->buf[6] << 16) + + (parse_ctx->buf[7] << 8) + + parse_ctx->buf[8]; + + if (next_pu_offset == 0 && + SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE(parse_ctx->buf[4])) + next_pu_offset = 13; + + if (next_pu_offset <= 0 || parse_ctx->buf_size < next_pu_offset) + return NULL; + + in_buf = av_malloc(next_pu_offset); + if (!in_buf) { + av_log(parse_ctx, AV_LOG_ERROR, "Unable to allocate input buffer\n"); + return NULL; + } + + memcpy(in_buf, parse_ctx->buf, next_pu_offset); + enc_buf = schro_buffer_new_with_data(in_buf, next_pu_offset); + enc_buf->free = libschroedinger_decode_buffer_free; + enc_buf->priv = in_buf; + + parse_ctx->buf += next_pu_offset; + parse_ctx->buf_size -= next_pu_offset; + + return enc_buf; +} + +/** +* Returns FFmpeg chroma format. +*/ +static enum AVPixelFormat get_chroma_format(SchroChromaFormat schro_pix_fmt) +{ + int num_formats = sizeof(schro_pixel_format_map) / + sizeof(schro_pixel_format_map[0]); + int idx; + + for (idx = 0; idx < num_formats; ++idx) + if (schro_pixel_format_map[idx].schro_pix_fmt == schro_pix_fmt) + return schro_pixel_format_map[idx].ff_pix_fmt; + return AV_PIX_FMT_NONE; +} + +static av_cold int libschroedinger_decode_init(AVCodecContext *avctx) +{ + + SchroDecoderParams *p_schro_params = avctx->priv_data; + /* First of all, initialize our supporting libraries. */ + schro_init(); + + schro_debug_set_level(avctx->debug); + p_schro_params->decoder = schro_decoder_new(); + schro_decoder_set_skip_ratio(p_schro_params->decoder, 1); + + if (!p_schro_params->decoder) + return -1; + + /* Initialize the decoded frame queue. */ + ff_schro_queue_init(&p_schro_params->dec_frame_queue); + return 0; +} + +static void libschroedinger_decode_frame_free(void *frame) +{ + schro_frame_unref(frame); +} + +static void libschroedinger_handle_first_access_unit(AVCodecContext *avctx) +{ + SchroDecoderParams *p_schro_params = avctx->priv_data; + SchroDecoder *decoder = p_schro_params->decoder; + + p_schro_params->format = schro_decoder_get_video_format(decoder); + + /* Tell FFmpeg about sequence details. */ + if (av_image_check_size(p_schro_params->format->width, + p_schro_params->format->height, 0, avctx) < 0) { + av_log(avctx, AV_LOG_ERROR, "invalid dimensions (%dx%d)\n", + p_schro_params->format->width, p_schro_params->format->height); + avctx->height = avctx->width = 0; + return; + } + avctx->height = p_schro_params->format->height; + avctx->width = p_schro_params->format->width; + avctx->pix_fmt = get_chroma_format(p_schro_params->format->chroma_format); + + if (ff_get_schro_frame_format(p_schro_params->format->chroma_format, + &p_schro_params->frame_format) == -1) { + av_log(avctx, AV_LOG_ERROR, + "This codec currently only supports planar YUV 4:2:0, 4:2:2 " + "and 4:4:4 formats.\n"); + return; + } + + avctx->time_base.den = p_schro_params->format->frame_rate_numerator; + avctx->time_base.num = p_schro_params->format->frame_rate_denominator; +} + +static int libschroedinger_decode_frame(AVCodecContext *avctx, + void *data, int *got_frame, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + int64_t pts = avpkt->pts; + SchroTag *tag; + + SchroDecoderParams *p_schro_params = avctx->priv_data; + SchroDecoder *decoder = p_schro_params->decoder; + SchroBuffer *enc_buf; + SchroFrame* frame; + AVFrame *avframe = data; + int state; + int go = 1; + int outer = 1; + SchroParseUnitContext parse_ctx; + LibSchroFrameContext *framewithpts = NULL; + + *got_frame = 0; + + parse_context_init(&parse_ctx, buf, buf_size); + if (!buf_size) { + if (!p_schro_params->eos_signalled) { + state = schro_decoder_push_end_of_stream(decoder); + p_schro_params->eos_signalled = 1; + } + } + + /* Loop through all the individual parse units in the input buffer */ + do { + if ((enc_buf = find_next_parse_unit(&parse_ctx))) { + /* Set Schrotag with the pts to be recovered after decoding*/ + enc_buf->tag = schro_tag_new(av_malloc(sizeof(int64_t)), av_free); + if (!enc_buf->tag->value) { + av_log(avctx, AV_LOG_ERROR, "Unable to allocate SchroTag\n"); + return AVERROR(ENOMEM); + } + AV_WN(64, enc_buf->tag->value, pts); + /* Push buffer into decoder. */ + if (SCHRO_PARSE_CODE_IS_PICTURE(enc_buf->data[4]) && + SCHRO_PARSE_CODE_NUM_REFS(enc_buf->data[4]) > 0) + avctx->has_b_frames = 1; + state = schro_decoder_push(decoder, enc_buf); + if (state == SCHRO_DECODER_FIRST_ACCESS_UNIT) + libschroedinger_handle_first_access_unit(avctx); + go = 1; + } else + outer = 0; + + while (go) { + /* Parse data and process result. */ + state = schro_decoder_wait(decoder); + switch (state) { + case SCHRO_DECODER_FIRST_ACCESS_UNIT: + libschroedinger_handle_first_access_unit(avctx); + break; + + case SCHRO_DECODER_NEED_BITS: + /* Need more input data - stop iterating over what we have. */ + go = 0; + break; + + case SCHRO_DECODER_NEED_FRAME: + /* Decoder needs a frame - create one and push it in. */ + frame = ff_create_schro_frame(avctx, + p_schro_params->frame_format); + schro_decoder_add_output_picture(decoder, frame); + break; + + case SCHRO_DECODER_OK: + /* Pull a frame out of the decoder. */ + tag = schro_decoder_get_picture_tag(decoder); + frame = schro_decoder_pull(decoder); + + if (frame) { + /* Add relation between schroframe and pts. */ + framewithpts = av_malloc(sizeof(LibSchroFrameContext)); + if (!framewithpts) { + av_log(avctx, AV_LOG_ERROR, "Unable to allocate FrameWithPts\n"); + return AVERROR(ENOMEM); + } + framewithpts->frame = frame; + framewithpts->pts = AV_RN64(tag->value); + ff_schro_queue_push_back(&p_schro_params->dec_frame_queue, + framewithpts); + } + break; + case SCHRO_DECODER_EOS: + go = 0; + p_schro_params->eos_pulled = 1; + schro_decoder_reset(decoder); + outer = 0; + break; + + case SCHRO_DECODER_ERROR: + return -1; + break; + } + } + } while (outer); + + /* Grab next frame to be returned from the top of the queue. */ + framewithpts = ff_schro_queue_pop(&p_schro_params->dec_frame_queue); + + if (framewithpts && framewithpts->frame) { + int ret; + + if ((ret = ff_get_buffer(avctx, avframe, 0)) < 0) + return ret; + + memcpy(avframe->data[0], + framewithpts->frame->components[0].data, + framewithpts->frame->components[0].length); + + memcpy(avframe->data[1], + framewithpts->frame->components[1].data, + framewithpts->frame->components[1].length); + + memcpy(avframe->data[2], + framewithpts->frame->components[2].data, + framewithpts->frame->components[2].length); + + /* Fill frame with current buffer data from Schroedinger. */ + avframe->pkt_pts = framewithpts->pts; + avframe->linesize[0] = framewithpts->frame->components[0].stride; + avframe->linesize[1] = framewithpts->frame->components[1].stride; + avframe->linesize[2] = framewithpts->frame->components[2].stride; + + *got_frame = 1; + + /* Now free the frame resources. */ + libschroedinger_decode_frame_free(framewithpts->frame); + av_free(framewithpts); + } else { + data = NULL; + *got_frame = 0; + } + return buf_size; +} + + +static av_cold int libschroedinger_decode_close(AVCodecContext *avctx) +{ + SchroDecoderParams *p_schro_params = avctx->priv_data; + /* Free the decoder. */ + schro_decoder_free(p_schro_params->decoder); + av_freep(&p_schro_params->format); + + /* Free data in the output frame queue. */ + ff_schro_queue_free(&p_schro_params->dec_frame_queue, + libschroedinger_decode_frame_free); + + return 0; +} + +static void libschroedinger_flush(AVCodecContext *avctx) +{ + /* Got a seek request. Free the decoded frames queue and then reset + * the decoder */ + SchroDecoderParams *p_schro_params = avctx->priv_data; + + /* Free data in the output frame queue. */ + ff_schro_queue_free(&p_schro_params->dec_frame_queue, + libschroedinger_decode_frame_free); + + ff_schro_queue_init(&p_schro_params->dec_frame_queue); + schro_decoder_reset(p_schro_params->decoder); + p_schro_params->eos_pulled = 0; + p_schro_params->eos_signalled = 0; +} + +AVCodec ff_libschroedinger_decoder = { + .name = "libschroedinger", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_DIRAC, + .priv_data_size = sizeof(SchroDecoderParams), + .init = libschroedinger_decode_init, + .close = libschroedinger_decode_close, + .decode = libschroedinger_decode_frame, + .capabilities = CODEC_CAP_DELAY, + .flush = libschroedinger_flush, + .long_name = NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"), +}; |