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/* |
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* TAK parser |
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* Copyright (c) 2012 Michael Niedermayer |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* TAK parser |
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**/ |
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#define BITSTREAM_READER_LE |
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#include "parser.h" |
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#include "tak.h" |
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typedef struct TAKParseContext { |
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ParseContext pc; |
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TAKStreamInfo ti; |
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int index; |
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} TAKParseContext; |
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1026 |
static int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx, |
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const uint8_t **poutbuf, int *poutbuf_size, |
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const uint8_t *buf, int buf_size) |
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{ |
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TAKParseContext *t = s->priv_data; |
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ParseContext *pc = &t->pc; |
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int next = END_NOT_FOUND; |
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GetBitContext gb; |
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int consumed = 0; |
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✓✓ |
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int needed = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8; |
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int ret; |
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*poutbuf = buf; |
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*poutbuf_size = buf_size; |
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✗✓ |
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if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
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TAKStreamInfo ti; |
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if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0) |
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return buf_size; |
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if (!ff_tak_decode_frame_header(avctx, &gb, &ti, 127)) |
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s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples |
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: t->ti.frame_samples; |
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return buf_size; |
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} |
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✓✓✓✓
|
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while (buf_size || t->index + needed <= pc->index) { |
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✓✓✓✗
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if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) { |
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int tmp_buf_size = FFMIN(TAK_MAX_FRAME_HEADER_BYTES, |
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buf_size); |
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const uint8_t *tmp_buf = buf; |
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✗✓ |
27687 |
if (ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size) != -1) |
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goto fail; |
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consumed += tmp_buf_size; |
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27687 |
buf += tmp_buf_size; |
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buf_size -= tmp_buf_size; |
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} |
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✓✓ |
1037901 |
for (; t->index + needed <= pc->index; t->index++) { |
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✓✓ |
1010250 |
if (pc->buffer[ t->index ] == 0xFF && |
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✓✓ |
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pc->buffer[ t->index + 1 ] == 0xA0) { |
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TAKStreamInfo ti; |
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✗✓ |
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if ((ret = init_get_bits8(&gb, pc->buffer + t->index, |
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pc->index - t->index)) < 0) |
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goto fail; |
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✓✓ |
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if (!ff_tak_decode_frame_header(avctx, &gb, |
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✓✓✓✓
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pc->frame_start_found ? &ti : &t->ti, 127) && |
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!ff_tak_check_crc(pc->buffer + t->index, |
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get_bits_count(&gb) / 8)) { |
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✓✓ |
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if (!pc->frame_start_found) { |
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pc->frame_start_found = 1; |
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s->duration = t->ti.last_frame_samples ? |
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✓✓ |
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t->ti.last_frame_samples : |
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t->ti.frame_samples; |
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s->key_frame = !!(t->ti.flags & TAK_FRAME_FLAG_HAS_INFO); |
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} else { |
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pc->frame_start_found = 0; |
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next = t->index - pc->index; |
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t->index = 0; |
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goto found; |
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} |
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} |
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} |
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} |
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} |
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found: |
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✓✓✓✓
✓✓✗✓
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if (consumed && !buf_size && next == END_NOT_FOUND || |
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ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
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goto fail; |
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} |
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✓✓ |
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if (next != END_NOT_FOUND) { |
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next += consumed; |
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✗✓ |
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pc->overread = FFMAX(0, -next); |
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} |
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*poutbuf = buf; |
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*poutbuf_size = buf_size; |
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return next; |
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fail: |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size + consumed; |
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} |
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AVCodecParser ff_tak_parser = { |
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.codec_ids = { AV_CODEC_ID_TAK }, |
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.priv_data_size = sizeof(TAKParseContext), |
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.parser_parse = tak_parse, |
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.parser_close = ff_parse_close, |
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}; |