diff options
| -rw-r--r-- | softhddev.c | 144 |
1 files changed, 137 insertions, 7 deletions
diff --git a/softhddev.c b/softhddev.c index 02e6674..d608d04 100644 --- a/softhddev.c +++ b/softhddev.c @@ -1,7 +1,7 @@ /// /// @file softhddev.c @brief A software HD device plugin for VDR. /// -/// Copyright (c) 2011 by Johns. All Rights Reserved. +/// Copyright (c) 2011, 2012 by Johns. All Rights Reserved. /// /// Contributor(s): /// @@ -60,6 +60,122 @@ static enum CodecID AudioCodecID; ///< current codec id extern void AudioTest(void); // FIXME: /** +** mpeg bitrate table. +** +** BitRateTable[Version][Layer][Index] +*/ +static const uint16_t BitRateTable[2][4][16] = { + // MPEG Version 1 + {{}, + {0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, + 0}, + {0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0}, + {0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0}}, + // MPEG Version 2 & 2.5 + {{}, + {0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0}, + {0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0}, + {0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0} + } +}; + +/** +** mpeg samperate table. +*/ +static const uint16_t SampleRateTable[4] = { + 44100, 48000, 32000, 0 +}; + +/** +** Find sync in audio packet. +** +** @param avpkt audio packet +** +** From: http://www.mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm +** +** AAAAAAAA AAABBCCD EEEEFFGH IIJJKLMM +** +** o a 11x frame sync +** o b 2x mpeg audio version (2.5, reserved, 2, 1) +** o c 2x layer (reserved, III, II, I) +** o e 2x BitRate index +** o f 2x SampleRate index +** o g 1x Paddding bit +** o .. doesn't care +** +** frame length: +** Layer I: +** FrameLengthInBytes = (12 * BitRate / SampleRate + Padding) * 4 +** Layer II & III: +** FrameLengthInBytes = 144 * BitRate / SampleRate + Padding +*/ +static int FindAudioSync(const AVPacket * avpkt) +{ + int i; + const uint8_t *data; + + i = 0; + data = avpkt->data; + while (i < avpkt->size - 4) { + if (data[i] == 0xFF && (data[i + 1] & 0xFC) == 0xFC) { + int mpeg2; + int mpeg25; + int layer; + int bit_rate_index; + int sample_rate_index; + int padding; + int bit_rate; + int sample_rate; + int frame_size; + + mpeg2 = !(data[i + 1] & 0x08) && (data[i + 1] & 0x10); + mpeg25 = !(data[i + 1] & 0x08) && !(data[i + 1] & 0x10); + layer = 4 - ((data[i + 1] >> 1) & 0x03); + bit_rate_index = (data[i + 2] >> 4) & 0x0F; + sample_rate_index = (data[i + 2] >> 2) & 0x03; + padding = (data[i + 2] >> 1) & 0x01; + + sample_rate = SampleRateTable[sample_rate_index]; + if (!sample_rate) { // no valid sample rate try next + i++; + continue; + } + sample_rate >>= mpeg2; // mpeg 2 half rate + sample_rate >>= mpeg25; // mpeg 2.5 quarter rate + + bit_rate = BitRateTable[mpeg2 | mpeg25][layer][bit_rate_index]; + bit_rate *= 1000; + switch (layer) { + case 1: + frame_size = (12 * bit_rate) / sample_rate; + frame_size = (frame_size + padding) * 4; + break; + case 2: + case 3: + default: + frame_size = (144 * bit_rate) / sample_rate; + frame_size = frame_size + padding; + break; + } + Debug(3, + "audio: mpeg%s layer%d bitrate=%d samplerate=%d %d bytes\n", + mpeg25 ? "2.5" : mpeg2 ? "2" : "1", layer, bit_rate, + sample_rate, frame_size); + if (i + frame_size < avpkt->size - 4) { + if (data[i + frame_size] == 0xFF + && (data[i + frame_size + 1] & 0xFC) == 0xFC) { + Debug(3, "audio: mpeg1/2 found at %d\n", i); + return i; + } + } + // no valid frame size or no continuation, try next + } + i++; + } + return -1; +} + +/** ** Play audio packet. ** ** @param data data of exactly one complete PES packet @@ -74,13 +190,10 @@ void PlayAudio(const uint8_t * data, int size, uint8_t id) if (BrokenThreadsAndPlugins) { return; } - // PES header 0x00 0x00 0x01 ID - // ID 0xBD 0xC0-0xCF - // channel switch: SetAudioChannelDevice: SetDigitalAudioDevice: - // Detect audio code - // MPEG-PS mp2 MPEG1, MPEG2, AC3 + // PES header 0x00 0x00 0x01 ID + // ID 0xBD 0xC0-0xCF if (size < 9) { Error(_("[softhddev] invalid audio packet\n")); @@ -111,6 +224,9 @@ void PlayAudio(const uint8_t * data, int size, uint8_t id) Error(_("[softhddev] invalid audio packet\n")); return; } + // Detect audio code + // MPEG-PS mp2 MPEG1, MPEG2, AC3 + // Syncword - 0x0B77 if (data[0] == 0x0B && data[1] == 0x77) { if (!MyAudioDecoder) { @@ -141,9 +257,23 @@ void PlayAudio(const uint8_t * data, int size, uint8_t id) // no start package // FIXME: Nick/Viva sends this shit, need to find sync in packet // FIXME: otherwise it takes too long until sound appears + if (AudioCodecID == CODEC_ID_NONE) { Debug(3, "[softhddev]%s: ??? %d\n", __FUNCTION__, id); - return; + avpkt->data = (void *)data; + avpkt->size = size; + n = FindAudioSync(avpkt); + if (n < 0) { + return; + } + if (!MyAudioDecoder) { + MyAudioDecoder = CodecAudioNewDecoder(); + } + + CodecAudioOpen(MyAudioDecoder, NULL, CODEC_ID_MP2); + AudioCodecID = CODEC_ID_MP2; + data += n; + size -= n; } } |