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Diffstat (limited to 'ffmpeg/libavcodec/mjpegbdec.c')
-rw-r--r--ffmpeg/libavcodec/mjpegbdec.c167
1 files changed, 0 insertions, 167 deletions
diff --git a/ffmpeg/libavcodec/mjpegbdec.c b/ffmpeg/libavcodec/mjpegbdec.c
deleted file mode 100644
index f061f0b..0000000
--- a/ffmpeg/libavcodec/mjpegbdec.c
+++ /dev/null
@@ -1,167 +0,0 @@
-/*
- * Apple MJPEG-B decoder
- * Copyright (c) 2002 Alex Beregszaszi
- *
- * 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
- * Apple MJPEG-B decoder.
- */
-
-#include "avcodec.h"
-#include "mjpeg.h"
-#include "mjpegdec.h"
-
-static uint32_t read_offs(AVCodecContext *avctx, GetBitContext *gb, uint32_t size, const char *err_msg){
- uint32_t offs= get_bits_long(gb, 32);
- if(offs >= size){
- av_log(avctx, AV_LOG_WARNING, err_msg, offs, size);
- return 0;
- }
- return offs;
-}
-
-static int mjpegb_decode_frame(AVCodecContext *avctx,
- void *data, int *got_frame,
- AVPacket *avpkt)
-{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- MJpegDecodeContext *s = avctx->priv_data;
- const uint8_t *buf_end, *buf_ptr;
- GetBitContext hgb; /* for the header */
- uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;
- uint32_t field_size, sod_offs;
- int ret;
-
- buf_ptr = buf;
- buf_end = buf + buf_size;
- s->got_picture = 0;
-
-read_header:
- /* reset on every SOI */
- s->restart_interval = 0;
- s->restart_count = 0;
- s->mjpb_skiptosod = 0;
-
- if (buf_end - buf_ptr >= 1 << 28)
- return AVERROR_INVALIDDATA;
-
- init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);
-
- skip_bits(&hgb, 32); /* reserved zeros */
-
- if (get_bits_long(&hgb, 32) != MKBETAG('m','j','p','g'))
- {
- av_log(avctx, AV_LOG_WARNING, "not mjpeg-b (bad fourcc)\n");
- return AVERROR_INVALIDDATA;
- }
-
- field_size = get_bits_long(&hgb, 32); /* field size */
- av_log(avctx, AV_LOG_DEBUG, "field size: 0x%x\n", field_size);
- skip_bits(&hgb, 32); /* padded field size */
- second_field_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "second_field_offs is %d and size is %d\n");
- av_log(avctx, AV_LOG_DEBUG, "second field offs: 0x%x\n", second_field_offs);
-
- dqt_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "dqt is %d and size is %d\n");
- av_log(avctx, AV_LOG_DEBUG, "dqt offs: 0x%x\n", dqt_offs);
- if (dqt_offs)
- {
- init_get_bits(&s->gb, buf_ptr+dqt_offs, (buf_end - (buf_ptr+dqt_offs))*8);
- s->start_code = DQT;
- if (ff_mjpeg_decode_dqt(s) < 0 &&
- (avctx->err_recognition & AV_EF_EXPLODE))
- return AVERROR_INVALIDDATA;
- }
-
- dht_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "dht is %d and size is %d\n");
- av_log(avctx, AV_LOG_DEBUG, "dht offs: 0x%x\n", dht_offs);
- if (dht_offs)
- {
- init_get_bits(&s->gb, buf_ptr+dht_offs, (buf_end - (buf_ptr+dht_offs))*8);
- s->start_code = DHT;
- ff_mjpeg_decode_dht(s);
- }
-
- sof_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "sof is %d and size is %d\n");
- av_log(avctx, AV_LOG_DEBUG, "sof offs: 0x%x\n", sof_offs);
- if (sof_offs)
- {
- init_get_bits(&s->gb, buf_ptr+sof_offs, (buf_end - (buf_ptr+sof_offs))*8);
- s->start_code = SOF0;
- if (ff_mjpeg_decode_sof(s) < 0)
- return -1;
- }
-
- sos_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "sos is %d and size is %d\n");
- av_log(avctx, AV_LOG_DEBUG, "sos offs: 0x%x\n", sos_offs);
- sod_offs = read_offs(avctx, &hgb, buf_end - buf_ptr, "sof is %d and size is %d\n");
- av_log(avctx, AV_LOG_DEBUG, "sod offs: 0x%x\n", sod_offs);
- if (sos_offs)
- {
- init_get_bits(&s->gb, buf_ptr + sos_offs,
- 8 * FFMIN(field_size, buf_end - buf_ptr - sos_offs));
- s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));
- s->start_code = SOS;
- if (ff_mjpeg_decode_sos(s, NULL, NULL) < 0 &&
- (avctx->err_recognition & AV_EF_EXPLODE))
- return AVERROR_INVALIDDATA;
- }
-
- if (s->interlaced) {
- s->bottom_field ^= 1;
- /* if not bottom field, do not output image yet */
- if (s->bottom_field != s->interlace_polarity && second_field_offs)
- {
- buf_ptr = buf + second_field_offs;
- goto read_header;
- }
- }
-
- //XXX FIXME factorize, this looks very similar to the EOI code
-
- if(!s->got_picture) {
- av_log(avctx, AV_LOG_WARNING, "no picture\n");
- return buf_size;
- }
-
- if ((ret = av_frame_ref(data, s->picture_ptr)) < 0)
- return ret;
- *got_frame = 1;
-
- if (!s->lossless && avctx->debug & FF_DEBUG_QP) {
- av_log(avctx, AV_LOG_DEBUG, "QP: %d\n",
- FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]));
- }
-
- return buf_size;
-}
-
-AVCodec ff_mjpegb_decoder = {
- .name = "mjpegb",
- .long_name = NULL_IF_CONFIG_SMALL("Apple MJPEG-B"),
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_MJPEGB,
- .priv_data_size = sizeof(MJpegDecodeContext),
- .init = ff_mjpeg_decode_init,
- .close = ff_mjpeg_decode_end,
- .decode = mjpegb_decode_frame,
- .capabilities = CODEC_CAP_DR1,
- .max_lowres = 3,
-};
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