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added format publishing

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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5426 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
beveloper
2003-11-21 15:28:22 +00:00
parent 5ccadc29e6
commit 9a74184e35
1 changed files with 37 additions and 9 deletions
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src/add-ons/media/plugins/mp3_reader/MP3ReaderPlugin.cpp
+37 -9
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@@ -4,6 +4,7 @@
#include <DataIO.h>
#include <ByteOrder.h>
#include <InterfaceDefs.h>
#include <MediaFormats.h>
#include "MP3ReaderPlugin.h"
#define TRACE_THIS 1
@@ -14,6 +15,7 @@
#endif
/* see
* http://www.dv.co.yu/mpgscript/mpeghdr.htm
* http://www.multiweb.cz/twoinches/MP3inside.htm
* http://www.id3.org/id3v2.3.0.txt
* http://www.id3.org/lyrics3.html
@@ -49,6 +51,15 @@ static const int bit_rate_table[4][4][16] =
}
};
// b_mpeg_id_table[mpeg_version_index][layer_index]
static const int32 b_mpeg_id_table[4][4] =
{
{ 0, B_MPEG_2_5_AUDIO_LAYER_3, B_MPEG_2_5_AUDIO_LAYER_2, B_MPEG_2_5_AUDIO_LAYER_1 },
{ 0, 0, 0, 0 },
{ 0, B_MPEG_2_AUDIO_LAYER_3, B_MPEG_2_AUDIO_LAYER_2, B_MPEG_2_AUDIO_LAYER_1 },
{ 0, B_MPEG_1_AUDIO_LAYER_3, B_MPEG_1_AUDIO_LAYER_2, B_MPEG_1_AUDIO_LAYER_1 },
};
// frame_rate_table[mpeg_version_index][sampling_rate_index]
static const int frame_rate_table[4][4] =
{
@@ -153,30 +164,47 @@ mp3Reader::AllocateCookie(int32 streamNumber, void **cookie)
data->chunkBuffer = new char[MAX_CHUNK_SIZE];
data->position = 0;
uint8 header[4];
Source()->ReadAt(fDataStart, header, sizeof(header));
int mpeg_version_index = (header[1] >> 3) & 0x03;
int layer_index = (header[1] >> 1) & 0x03;
int bit_rate;
int frame_size;
if (fXingVbrInfo && fXingVbrInfo->frameCount != -1 && fXingVbrInfo->duration != -1) {
TRACE("mp3Reader::AllocateCookie: using timing info from VBR header\n");
bit_rate = (fXingVbrInfo->byteCount * 8 * 1000000) / fXingVbrInfo->duration; // average bit rate
frame_size = fXingVbrInfo->byteCount / fXingVbrInfo->encodedFramesCount; // average frame size
data->duration = fXingVbrInfo->duration;
data->frameCount = fXingVbrInfo->frameCount;
data->frameRate = fXingVbrInfo->frameRate;
} else {
TRACE("mp3Reader::AllocateCookie: assuming CBR, calculating timing info from file\n");
uint8 header[4];
Source()->ReadAt(fDataStart, header, sizeof(header));
int mpeg_version_index = (header[1] >> 3) & 0x03;
int layer_index = (header[1] >> 1) & 0x03;
int sampling_rate_index = (header[2] >> 2) & 0x03;
int bitrate_index = (header[2] >> 4) & 0x0f;
int samples_per_chunk = frame_sample_count_table[layer_index];
bit_rate = 1000 * bit_rate_table[mpeg_version_index][layer_index][bitrate_index];
frame_size = GetFrameLength(header);
data->frameRate = frame_rate_table[mpeg_version_index][sampling_rate_index];
data->frameCount = samples_per_chunk * (fDataSize / GetFrameLength(header));
data->frameCount = samples_per_chunk * (fDataSize / frame_size);
data->duration = (data->frameCount * 1000000) / data->frameRate;
}
TRACE("mp3Reader::AllocateCookie: frameRate %ld, frameCount %Ld, duration %.6f\n",
data->frameRate, data->frameCount, data->duration / 1000000.0);
memset(&data->format, 0, sizeof(data->format));
data->format.type = B_MEDIA_ENCODED_AUDIO;
// XXX fix this
BMediaFormats formats;
media_format_description description;
description.family = B_MPEG_FORMAT_FAMILY;
description.u.mpeg.id = b_mpeg_id_table[mpeg_version_index][layer_index];
formats.GetFormatFor(description, &data->format);
data->format.u.encoded_audio.encoding = media_encoded_audio_format::B_ANY;
data->format.u.encoded_audio.bit_rate = bit_rate;
data->format.u.encoded_audio.frame_size = frame_size;
// data->format.u.encoded_audio.output.frame_rate = data->frameRate;
// data->format.u.encoded_audio.output.channel_count = 2;
// store the cookie
*cookie = data;
@@ -608,7 +636,7 @@ mp3Reader::XingSeekPoint(float percent)
fx = fa + (fb - fa) * (percent - a);
point = (int64)((1.0f / 256.0f) * fx * fXingVbrInfo->byteCount);
TRACE("mp3Reader::XingSeekPoint for %.2f%% is %Ld\n", percent, point);
TRACE("mp3Reader::XingSeekPoint for %.8f%% is %Ld\n", percent, point);
return point;
}