Head

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/mpegaudio_parser.c	Lines:	54	61	88.5 %
Date:	2020-01-28 04:56:05	Branches:	41	44	93.2 %


/*
 * MPEG Audio parser
 * Copyright (c) 2003 Fabrice Bellard
 * Copyright (c) 2003 Michael Niedermayer
 *
 * 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
 */

#include "parser.h"
#include "mpegaudiodecheader.h"
#include "libavutil/common.h"
#include "libavformat/apetag.h" // for APE tag.
#include "libavformat/id3v1.h" // for ID3v1_TAG_SIZE

typedef struct MpegAudioParseContext {
    ParseContext pc;
    int frame_size;
    uint32_t header;
    int header_count;
    int no_bitrate;
} MpegAudioParseContext;

#define MPA_HEADER_SIZE 4

/* header + layer + freq + lsf/mpeg25 */
#define SAME_HEADER_MASK \
   (0xffe00000 | (3 << 17) | (3 << 10) | (3 << 19))

static int mpegaudio_parse(AVCodecParserContext *s1,
                           AVCodecContext *avctx,
                           const uint8_t **poutbuf, int *poutbuf_size,
                           const uint8_t *buf, int buf_size)
{
    MpegAudioParseContext *s = s1->priv_data;
    ParseContext *pc = &s->pc;
    uint32_t state= pc->state;
    int i;
    int next= END_NOT_FOUND;
    int flush = !buf_size;

    for(i=0; i<buf_size; ){
        if(s->frame_size){
            int inc= FFMIN(buf_size - i, s->frame_size);
            i += inc;
            s->frame_size -= inc;
            state = 0;

            if(!s->frame_size){
                next= i;
                break;
            }
        }else{
            while(i<buf_size){
                int ret, sr, channels, bit_rate, frame_size;
                enum AVCodecID codec_id = avctx->codec_id;

                state= (state<<8) + buf[i++];

                ret = ff_mpa_decode_header(state, &sr, &channels, &frame_size, &bit_rate, &codec_id);
                if (ret < 4) {
                    if (i > 4)
                        s->header_count = -2;
                } else {
                    int header_threshold = avctx->codec_id != AV_CODEC_ID_NONE && avctx->codec_id != codec_id;
                    if((state&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
                        s->header_count= -3;
                    s->header= state;
                    s->header_count++;
                    s->frame_size = ret-4;

                    if (s->header_count > header_threshold) {
                        avctx->sample_rate= sr;
                        avctx->channels   = channels;
                        s1->duration      = frame_size;
                        avctx->codec_id   = codec_id;
                        if (s->no_bitrate || !avctx->bit_rate) {
                            s->no_bitrate = 1;
                            avctx->bit_rate += (bit_rate - avctx->bit_rate) / (s->header_count - header_threshold);
                        }
                    }

                    if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
                        s->frame_size = 0;
                        next = buf_size;
                    } else if (codec_id == AV_CODEC_ID_MP3ADU) {
                        avpriv_report_missing_feature(avctx,
                            "MP3ADU full parser");
                        *poutbuf = NULL;
                        *poutbuf_size = 0;
                        return buf_size; /* parsers must not return error codes */
                    }

                    break;
                }
            }
        }
    }

    pc->state= state;
    if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
        *poutbuf = NULL;
        *poutbuf_size = 0;
        return buf_size;
    }

    if (flush && buf_size >= ID3v1_TAG_SIZE && memcmp(buf, "TAG", 3) == 0) {
        *poutbuf = NULL;
        *poutbuf_size = 0;
        return next;
    }

    if (flush && buf_size >= APE_TAG_FOOTER_BYTES && memcmp(buf, APE_TAG_PREAMBLE, 8) == 0) {
        *poutbuf = NULL;
        *poutbuf_size = 0;
        return next;
    }

    *poutbuf = buf;
    *poutbuf_size = buf_size;
    return next;
}


AVCodecParser ff_mpegaudio_parser = {
    .codec_ids      = { AV_CODEC_ID_MP1, AV_CODEC_ID_MP2, AV_CODEC_ID_MP3, AV_CODEC_ID_MP3ADU },
    .priv_data_size = sizeof(MpegAudioParseContext),
    .parser_parse   = mpegaudio_parse,
    .parser_close   = ff_parse_close,
};


Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/*
2			* MPEG Audio parser
3			* Copyright (c) 2003 Fabrice Bellard
4			* Copyright (c) 2003 Michael Niedermayer
5			*
6			* This file is part of FFmpeg.
7			*
8			* FFmpeg is free software; you can redistribute it and/or
9			* modify it under the terms of the GNU Lesser General Public
10			* License as published by the Free Software Foundation; either
11			* version 2.1 of the License, or (at your option) any later version.
12			*
13			* FFmpeg is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16			* Lesser General Public License for more details.
17			*
18			* You should have received a copy of the GNU Lesser General Public
19			* License along with FFmpeg; if not, write to the Free Software
20			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21			*/
22
23			#include "parser.h"
24			#include "mpegaudiodecheader.h"
25			#include "libavutil/common.h"
26			#include "libavformat/apetag.h" // for APE tag.
27			#include "libavformat/id3v1.h" // for ID3v1_TAG_SIZE
28
29			typedef struct MpegAudioParseContext {
30			ParseContext pc;
31			int frame_size;
32			uint32_t header;
33			int header_count;
34			int no_bitrate;
35			} MpegAudioParseContext;
36
37			#define MPA_HEADER_SIZE 4
38
39			/* header + layer + freq + lsf/mpeg25 */
40			#define SAME_HEADER_MASK \
41			(0xffe00000 \| (3 << 17) \| (3 << 10) \| (3 << 19))
42
43		19126	static int mpegaudio_parse(AVCodecParserContext *s1,
44			AVCodecContext *avctx,
45			const uint8_t *poutbuf, int poutbuf_size,
46			const uint8_t *buf, int buf_size)
47			{
48		19126	MpegAudioParseContext *s = s1->priv_data;
49		19126	ParseContext *pc = &s->pc;
50		19126	uint32_t state= pc->state;
51			int i;
52		19126	int next= END_NOT_FOUND;
53		19126	int flush = !buf_size;
54
55	✓✓	38526	for(i=0; i<buf_size; ){
56	✓✓	35255	if(s->frame_size){
57		18777	int inc= FFMIN(buf_size - i, s->frame_size);
58		18777	i += inc;
59		18777	s->frame_size -= inc;
60		18777	state = 0;
61
62	✓✓	18777	if(!s->frame_size){
63		15855	next= i;
64		15855	break;
65			}
66			}else{
67	✓✓	199426	while(i<buf_size){
68			int ret, sr, channels, bit_rate, frame_size;
69		199178	enum AVCodecID codec_id = avctx->codec_id;
70
71		199178	state= (state<<8) + buf[i++];
72
73		199178	ret = ff_mpa_decode_header(state, &sr, &channels, &frame_size, &bit_rate, &codec_id);
74	✓✓	199178	if (ret < 4) {
75	✓✓	182948	if (i > 4)
76		134251	s->header_count = -2;
77			} else {
78	✓✗✓✓	16230	int header_threshold = avctx->codec_id != AV_CODEC_ID_NONE && avctx->codec_id != codec_id;
79	✓✓✓✓	16230	if((state&SAME_HEADER_MASK) != (s->header&SAME_HEADER_MASK) && s->header)
80		17	s->header_count= -3;
81		16230	s->header= state;
82		16230	s->header_count++;
83		16230	s->frame_size = ret-4;
84
85	✓✓	16230	if (s->header_count > header_threshold) {
86		15942	avctx->sample_rate= sr;
87		15942	avctx->channels = channels;
88		15942	s1->duration = frame_size;
89		15942	avctx->codec_id = codec_id;
90	✓✓✓✓	15942	if (s->no_bitrate \|\| !avctx->bit_rate) {
91		11075	s->no_bitrate = 1;
92		11075	avctx->bit_rate += (bit_rate - avctx->bit_rate) / (s->header_count - header_threshold);
93			}
94			}
95
96	✓✓	16230	if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
97		251	s->frame_size = 0;
98		251	next = buf_size;
99	✗✓	15979	} else if (codec_id == AV_CODEC_ID_MP3ADU) {
100			avpriv_report_missing_feature(avctx,
101			"MP3ADU full parser");
102			*poutbuf = NULL;
103			*poutbuf_size = 0;
104			return buf_size; /* parsers must not return error codes */
105			}
106
107		16230	break;
108			}
109			}
110			}
111			}
112
113		19126	pc->state= state;
114	✓✓	19126	if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
115		2932	*poutbuf = NULL;
116		2932	*poutbuf_size = 0;
117		2932	return buf_size;
118			}
119
120	✓✓✓✓ ✓✓	16194	if (flush && buf_size >= ID3v1_TAG_SIZE && memcmp(buf, "TAG", 3) == 0) {
121		5	*poutbuf = NULL;
122		5	*poutbuf_size = 0;
123		5	return next;
124			}
125
126	✓✓✓✓ ✗✓	16189	if (flush && buf_size >= APE_TAG_FOOTER_BYTES && memcmp(buf, APE_TAG_PREAMBLE, 8) == 0) {
127			*poutbuf = NULL;
128			*poutbuf_size = 0;
129			return next;
130			}
131
132		16189	*poutbuf = buf;
133		16189	*poutbuf_size = buf_size;
134		16189	return next;
135			}
136
137
138			AVCodecParser ff_mpegaudio_parser = {
139			.codec_ids = { AV_CODEC_ID_MP1, AV_CODEC_ID_MP2, AV_CODEC_ID_MP3, AV_CODEC_ID_MP3ADU },
140			.priv_data_size = sizeof(MpegAudioParseContext),
141			.parser_parse = mpegaudio_parse,
142			.parser_close = ff_parse_close,
143			};