FFmpeg: libavformat/uncodedframecrcenc.c Source File

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libavformat

uncodedframecrcenc.c

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1 /*

3 *

4 * This file is part of FFmpeg.

5 *

6 * FFmpeg is free software; you can redistribute it and/or

7 * modify it under the terms of the GNU Lesser General Public License

8 * as published by the Free Software Foundation; either

9 * version 2.1 of the License, or (at your option) any later version.

10 *

11 * FFmpeg is distributed in the hope that it will be useful,

12 * but WITHOUT ANY WARRANTY; without even the implied warranty of

13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

14 * GNU Lesser General Public License for more details.

15 *

16 * You should have received a copy of the GNU Lesser General Public License

17 * along with FFmpeg; if not, write to the Free Software Foundation, Inc.,

18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

19 */

21 #include "libavutil/adler32.h"

22 #include "libavutil/avassert.h"

23 #include "libavutil/bprint.h"

24 #include "libavutil/imgutils.h"

25 #include "libavutil/pixdesc.h"

26 #include "avformat.h"

27 #include "internal.h"

29 /* Identical to Adler32 when the type is uint8_t. */

30 #define DEFINE_CKSUM_LINE(name, type, conv) \

31 static void cksum_line_ ## name(unsigned *cksum, void *data, unsigned size) \

32 { \

33 type *p = data; \

34 unsigned a = *cksum & 0xFFFF, b = *cksum >> 16; \

35 for (; size > 0; size--, p++) { \

36 a = (a + (unsigned)(conv)) % 65521; \

37 b = (b + a) % 65521; \

38 } \

39 *cksum = a | (b << 16); \

40 }

42 DEFINE_CKSUM_LINE(u8, uint8_t, *p)

43 DEFINE_CKSUM_LINE(s16, int16_t, *p + 0x8000)

44 DEFINE_CKSUM_LINE(s32, int32_t, *p + 0x80000000)

45 DEFINE_CKSUM_LINE(flt, float, *p * 0x80000000 + 0x80000000)

46 DEFINE_CKSUM_LINE(dbl, double, *p * 0x80000000 + 0x80000000)

48 static void video_frame_cksum(AVBPrint *bp, AVFrame *frame)

49 {

50 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(frame->format);

51 int i, y;

52 uint8_t *data;

53 int linesize[5] = { 0 };

55 av_bprintf(bp, ", %d x %d", frame->width, frame->height);

56 if (!desc) {

57 av_bprintf(bp, ", unknown");

58 return;

59 }

60 if (av_image_fill_linesizes(linesize, frame->format, frame->width) < 0)

61 return;

62 av_bprintf(bp, ", %s", desc->name);

63 for (i = 0; linesize[i]; i++) {

64 unsigned cksum = 0;

65 int h = frame->height;

66 if ((i == 1 || i == 2) && desc->nb_components >= 3)

67 h = -((-h) >> desc->log2_chroma_h);

68 data = frame->data[i];

69 for (y = 0; y < h; y++) {

70 cksum = av_adler32_update(cksum, data, linesize[i]);

71 data += frame->linesize[i];

72 }

73 av_bprintf(bp, ", 0x%08x", cksum);

74 }

75 }

77 static void audio_frame_cksum(AVBPrint *bp, AVFrame *frame)

78 {

79 int nb_planes, nb_samples, p;

80 const char *name;

82 nb_planes = av_frame_get_channels(frame);

83 nb_samples = frame->nb_samples;

84 if (!av_sample_fmt_is_planar(frame->format)) {

85 nb_samples *= nb_planes;

86 nb_planes = 1;

87 }

88 name = av_get_sample_fmt_name(frame->format);

89 av_bprintf(bp, ", %d samples", frame->nb_samples);

90 av_bprintf(bp, ", %s", name ? name : "unknown");

91 for (p = 0; p < nb_planes; p++) {

92 uint32_t cksum = 0;

93 void *d = frame->extended_data[p];

94 switch (frame->format) {

95 case AV_SAMPLE_FMT_U8:

96 case AV_SAMPLE_FMT_U8P:

97 cksum_line_u8(&cksum, d, nb_samples);

98 break;

99 case AV_SAMPLE_FMT_S16:

100 case AV_SAMPLE_FMT_S16P:

101 cksum_line_s16(&cksum, d, nb_samples);

102 break;

103 case AV_SAMPLE_FMT_S32:

104 case AV_SAMPLE_FMT_S32P:

105 cksum_line_s32(&cksum, d, nb_samples);

106 break;

107 case AV_SAMPLE_FMT_FLT:

108 case AV_SAMPLE_FMT_FLTP:

109 cksum_line_flt(&cksum, d, nb_samples);

110 break;

111 case AV_SAMPLE_FMT_DBL:

112 case AV_SAMPLE_FMT_DBLP:

113 cksum_line_dbl(&cksum, d, nb_samples);

114 break;

115 default:

116 av_assert0(!"reached");

117 }

118 av_bprintf(bp, ", 0x%08x", cksum);

119 }

120 }

121

122 static int write_frame(struct AVFormatContext *s, int stream_index,

123 AVFrame **frame, unsigned flags)

124 {

125 AVBPrint bp;

126 int ret = 0;

127 enum AVMediaType type;

128 const char *type_name;

129

130 if ((flags & AV_WRITE_UNCODED_FRAME_QUERY))

131 return 0;

132

133 av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);

134 av_bprintf(&bp, "%d, %10"PRId64"",

135 stream_index, (*frame)->pts);

136 type = s->streams[stream_index]->codec->codec_type;

137 type_name = av_get_media_type_string(type);

138 av_bprintf(&bp, ", %s", type_name ? type_name : "unknown");

139 switch (type) {

140 case AVMEDIA_TYPE_VIDEO:

141 video_frame_cksum(&bp, *frame);

142 break;

143 case AVMEDIA_TYPE_AUDIO:

144 audio_frame_cksum(&bp, *frame);

145 break;

146 }

147

148 av_bprint_chars(&bp, '\n', 1);

149 if (av_bprint_is_complete(&bp))

150 avio_write(s->pb, bp.str, bp.len);

151 else

152 ret = AVERROR(ENOMEM);

153 av_bprint_finalize(&bp, NULL);

154 return ret;

155 }

156

157 static int write_packet(struct AVFormatContext *s, AVPacket *pkt)

158 {

159 return AVERROR(ENOSYS);

160 }

161

162 AVOutputFormat ff_uncodedframecrc_muxer = {

163 .name = "uncodedframecrc",

164 .long_name = NULL_IF_CONFIG_SMALL("uncoded framecrc testing"),

165 .audio_codec = AV_CODEC_ID_PCM_S16LE,

166 .video_codec = AV_CODEC_ID_RAWVIDEO,

167 .write_header = ff_framehash_write_header,

168 .write_packet = write_packet,

169 .write_uncoded_frame = write_frame,

170 .flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |

171 AVFMT_TS_NEGATIVE,

172 };

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