/* GStreamer * Copyright (C) <1999> Erik Walthinsen * Copyright (C) <2005> Jan Schmidt * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /* Element-Checklist-Version: TODO */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include "gstdvdlpcmdec.h" #include GST_DEBUG_CATEGORY_STATIC (dvdlpcm_debug); #define GST_CAT_DEFAULT dvdlpcm_debug static GstStaticPadTemplate gst_dvdlpcmdec_sink_template = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-private1-lpcm; " "audio/x-private2-lpcm; " "audio/x-private-ts-lpcm; " "audio/x-lpcm, " "width = (int) { 16, 20, 24 }, " "rate = (int) { 32000, 44100, 48000, 96000 }, " "channels = (int) [ 1, 8 ], " "dynamic_range = (int) [ 0, 255 ], " "emphasis = (boolean) { TRUE, FALSE }, " "mute = (boolean) { TRUE, FALSE } ") ); static GstStaticPadTemplate gst_dvdlpcmdec_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw, " "format = (string) { S16BE, S24BE }, " "layout = (string) interleaved, " "rate = (int) { 32000, 44100, 48000, 96000 }, " "channels = (int) [ 1, 8 ]") ); #define gst_dvdlpcmdec_parent_class parent_class G_DEFINE_TYPE (GstDvdLpcmDec, gst_dvdlpcmdec, GST_TYPE_AUDIO_DECODER); static gboolean gst_dvdlpcmdec_set_format (GstAudioDecoder * bdec, GstCaps * caps); static GstFlowReturn gst_dvdlpcmdec_parse (GstAudioDecoder * bdec, GstAdapter * adapter, gint * offset, gint * len); static GstFlowReturn gst_dvdlpcmdec_handle_frame (GstAudioDecoder * bdec, GstBuffer * buffer); static GstFlowReturn gst_dvdlpcmdec_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer); static void gst_dvdlpcmdec_class_init (GstDvdLpcmDecClass * klass) { GstElementClass *element_class; GstAudioDecoderClass *gstbase_class; element_class = (GstElementClass *) klass; gstbase_class = (GstAudioDecoderClass *) klass; gstbase_class->set_format = GST_DEBUG_FUNCPTR (gst_dvdlpcmdec_set_format); gstbase_class->parse = GST_DEBUG_FUNCPTR (gst_dvdlpcmdec_parse); gstbase_class->handle_frame = GST_DEBUG_FUNCPTR (gst_dvdlpcmdec_handle_frame); gst_element_class_add_static_pad_template (element_class, &gst_dvdlpcmdec_sink_template); gst_element_class_add_static_pad_template (element_class, &gst_dvdlpcmdec_src_template); gst_element_class_set_static_metadata (element_class, "DVD LPCM Audio decoder", "Codec/Decoder/Audio", "Decode DVD LPCM frames into standard PCM audio", "Jan Schmidt , Michael Smith "); GST_DEBUG_CATEGORY_INIT (dvdlpcm_debug, "dvdlpcmdec", 0, "DVD LPCM Decoder"); } static void gst_dvdlpcm_reset (GstDvdLpcmDec * dvdlpcmdec) { gst_audio_info_init (&dvdlpcmdec->info); dvdlpcmdec->dynamic_range = 0; dvdlpcmdec->emphasis = FALSE; dvdlpcmdec->mute = FALSE; dvdlpcmdec->header = 0; dvdlpcmdec->mode = GST_LPCM_UNKNOWN; } static void gst_dvdlpcmdec_init (GstDvdLpcmDec * dvdlpcmdec) { gst_dvdlpcm_reset (dvdlpcmdec); gst_audio_decoder_set_use_default_pad_acceptcaps (GST_AUDIO_DECODER_CAST (dvdlpcmdec), TRUE); GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_DECODER_SINK_PAD (dvdlpcmdec)); /* retrieve and intercept base class chain. * Quite HACKish, but that's dvd specs/caps for you, * since one buffer needs to be split into 2 frames */ dvdlpcmdec->base_chain = GST_PAD_CHAINFUNC (GST_AUDIO_DECODER_SINK_PAD (dvdlpcmdec)); gst_pad_set_chain_function (GST_AUDIO_DECODER_SINK_PAD (dvdlpcmdec), GST_DEBUG_FUNCPTR (gst_dvdlpcmdec_chain)); } static const GstAudioChannelPosition channel_positions[][8] = { {GST_AUDIO_CHANNEL_POSITION_MONO}, {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, {GST_AUDIO_CHANNEL_POSITION_INVALID}, {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT, GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, {GST_AUDIO_CHANNEL_POSITION_INVALID}, {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, GST_AUDIO_CHANNEL_POSITION_LFE1, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT, GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, {GST_AUDIO_CHANNEL_POSITION_INVALID}, {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, GST_AUDIO_CHANNEL_POSITION_LFE1, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT, GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT, GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT, GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT}, {GST_AUDIO_CHANNEL_POSITION_INVALID} }; static const GstAudioChannelPosition bluray_channel_positions[][8] = { /* invalid */ {GST_AUDIO_CHANNEL_POSITION_INVALID}, /* mono */ {GST_AUDIO_CHANNEL_POSITION_MONO}, /* invalid */ {GST_AUDIO_CHANNEL_POSITION_INVALID}, /* stereo */ {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT}, /* surround */ {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER}, /* 2.1 */ {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}, /* 4.0 */ {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, GST_AUDIO_CHANNEL_POSITION_REAR_CENTER}, /* 2.2 */ {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT, GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT}, /* 5.0 */ {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT, GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT}, /* 5.1 */ {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT, GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT, GST_AUDIO_CHANNEL_POSITION_LFE1}, /* 7.0 */ {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT, GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT, GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT}, /* 7.1 */ {GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT, GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT, GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER, GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT, GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT, GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT, GST_AUDIO_CHANNEL_POSITION_LFE1}, /* invalid */ {GST_AUDIO_CHANNEL_POSITION_INVALID}, /* invalid */ {GST_AUDIO_CHANNEL_POSITION_INVALID}, /* invalid */ {GST_AUDIO_CHANNEL_POSITION_INVALID}, /* invalid */ {GST_AUDIO_CHANNEL_POSITION_INVALID} }; static void gst_dvdlpcmdec_send_tags (GstDvdLpcmDec * dvdlpcmdec) { GstTagList *taglist; guint bitrate; gint bpf, rate; bpf = GST_AUDIO_INFO_BPF (&dvdlpcmdec->info); rate = GST_AUDIO_INFO_RATE (&dvdlpcmdec->info); bitrate = bpf * 8 * rate; taglist = gst_tag_list_new (GST_TAG_AUDIO_CODEC, "LPCM Audio", GST_TAG_BITRATE, bitrate, NULL); gst_audio_decoder_merge_tags (GST_AUDIO_DECODER (dvdlpcmdec), taglist, GST_TAG_MERGE_REPLACE); gst_tag_list_unref (taglist); } static gboolean gst_dvdlpcmdec_set_output_format (GstDvdLpcmDec * dvdlpcmdec) { gboolean res = TRUE; res = gst_audio_decoder_set_output_format (GST_AUDIO_DECODER (dvdlpcmdec), &dvdlpcmdec->info); if (res) { GST_DEBUG_OBJECT (dvdlpcmdec, "Successfully set output format"); gst_dvdlpcmdec_send_tags (dvdlpcmdec); } else { GST_DEBUG_OBJECT (dvdlpcmdec, "Failed to set output format"); } return res; } static void gst_dvdlpcmdec_update_audio_formats (GstDvdLpcmDec * dec, gint channels, gint rate, GstAudioFormat format, guint8 channel_indicator, const GstAudioChannelPosition positions[][8]) { GST_DEBUG_OBJECT (dec, "got channels = %d, rate = %d, format = %d", channels, rate, format); /* Reorder the channel positions and set the default into for the audio */ if (channels < 9 && positions[channel_indicator][0] != GST_AUDIO_CHANNEL_POSITION_INVALID) { const GstAudioChannelPosition *position; GstAudioChannelPosition sorted_position[8]; guint c; position = positions[channel_indicator]; for (c = 0; c < channels; ++c) sorted_position[c] = position[c]; gst_audio_channel_positions_to_valid_order (sorted_position, channels); gst_audio_info_set_format (&dec->info, format, rate, channels, sorted_position); if (memcmp (position, sorted_position, channels * sizeof (position[0])) != 0) dec->lpcm_layout = position; else dec->lpcm_layout = NULL; } else { gst_audio_info_set_format (&dec->info, format, rate, channels, NULL); } } static gboolean gst_dvdlpcmdec_set_format (GstAudioDecoder * bdec, GstCaps * caps) { GstDvdLpcmDec *dvdlpcmdec = GST_DVDLPCMDEC (bdec); GstStructure *structure; gboolean res = TRUE; GstAudioFormat format; gint rate, channels, width; gst_dvdlpcm_reset (dvdlpcmdec); structure = gst_caps_get_structure (caps, 0); /* If we have the DVD structured LPCM (including header) then we wait * for incoming data before creating the output pad caps */ if (gst_structure_has_name (structure, "audio/x-private1-lpcm")) { dvdlpcmdec->mode = GST_LPCM_DVD; goto done; } if (gst_structure_has_name (structure, "audio/x-private2-lpcm")) { dvdlpcmdec->mode = GST_LPCM_1394; goto done; } if (gst_structure_has_name (structure, "audio/x-private-ts-lpcm")) { dvdlpcmdec->mode = GST_LPCM_BLURAY; goto done; } dvdlpcmdec->mode = GST_LPCM_RAW; res &= gst_structure_get_int (structure, "rate", &rate); res &= gst_structure_get_int (structure, "channels", &channels); res &= gst_structure_get_int (structure, "width", &width); res &= gst_structure_get_int (structure, "dynamic_range", &dvdlpcmdec->dynamic_range); res &= gst_structure_get_boolean (structure, "emphasis", &dvdlpcmdec->emphasis); res &= gst_structure_get_boolean (structure, "mute", &dvdlpcmdec->mute); if (!res) goto caps_parse_error; switch (width) { case 24: case 20: format = GST_AUDIO_FORMAT_S24BE; break; case 16: format = GST_AUDIO_FORMAT_S16BE; break; default: format = GST_AUDIO_FORMAT_UNKNOWN; break; } gst_dvdlpcmdec_update_audio_formats (dvdlpcmdec, channels, rate, format, channels - 1, channel_positions); dvdlpcmdec->width = width; res = gst_dvdlpcmdec_set_output_format (dvdlpcmdec); done: return res; /* ERRORS */ caps_parse_error: { GST_DEBUG_OBJECT (dvdlpcmdec, "Couldn't get parameters; missing caps?"); return FALSE; } } static void parse_header (GstDvdLpcmDec * dec, guint32 header) { GstAudioFormat format; gint rate, channels, width; /* We don't actually use 'dynamic range', 'mute', or 'emphasis' currently, * but parse them out */ dec->dynamic_range = header & 0xff; dec->mute = (header & 0x400000) != 0; dec->emphasis = (header & 0x800000) != 0; /* These two bits tell us the bit depth */ switch (header & 0xC000) { case 0x8000: /* 24 bits in 3 bytes */ format = GST_AUDIO_FORMAT_S24BE; width = 24; break; case 0x4000: /* 20 bits in 3 bytes */ format = GST_AUDIO_FORMAT_S24BE; width = 20; break; default: format = GST_AUDIO_FORMAT_S16BE; width = 16; break; } dec->width = width; /* Only four sample rates supported */ switch (header & 0x3000) { case 0x0000: rate = 48000; break; case 0x1000: rate = 96000; break; case 0x2000: rate = 44100; break; case 0x3000: rate = 32000; break; default: rate = 0; break; } /* And, of course, the number of channels (up to 8) */ channels = ((header >> 8) & 0x7) + 1; gst_dvdlpcmdec_update_audio_formats (dec, channels, rate, format, channels - 1, channel_positions); } static GstFlowReturn gst_dvdlpcmdec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf) { GstDvdLpcmDec *dvdlpcmdec = GST_DVDLPCMDEC (parent); guint8 data[2]; gsize size; guint first_access; GstBuffer *subbuf; GstFlowReturn ret = GST_FLOW_OK; gint off, len; if (dvdlpcmdec->mode != GST_LPCM_DVD) return dvdlpcmdec->base_chain (pad, parent, buf); size = gst_buffer_get_size (buf); if (size < 5) goto too_small; gst_buffer_extract (buf, 0, data, 2); first_access = (data[0] << 8) | data[1]; if (first_access > size) goto invalid_data; /* After first_access, we have an additional 3 bytes of header data; this * is included within the value of first_access. * So a first_access value of between 1 and 3 is just broken, we treat that * the same as zero. first_access == 4 means we only need to create a single * sub-buffer, greater than that we need to create two. */ /* skip access unit bytes */ off = 2; if (first_access > 4) { /* length of first buffer */ len = first_access - 1; GST_LOG_OBJECT (dvdlpcmdec, "Creating first sub-buffer off %d, len %d", off, len); /* see if we need a subbuffer without timestamp */ if (off + len > size) goto bad_first_access; subbuf = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, off, len); GST_BUFFER_TIMESTAMP (subbuf) = GST_CLOCK_TIME_NONE; ret = dvdlpcmdec->base_chain (pad, parent, subbuf); if (ret != GST_FLOW_OK) goto done; /* then the buffer with new timestamp */ off += len; len = size - off; GST_LOG_OBJECT (dvdlpcmdec, "Creating next sub-buffer off %d, len %d", off, len); if (len > 0) { GstMemory *header, *tmp; subbuf = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, off, len); tmp = gst_buffer_peek_memory (buf, 0); header = gst_memory_copy (tmp, 2, 3); gst_buffer_prepend_memory (subbuf, header); GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf); ret = dvdlpcmdec->base_chain (pad, parent, subbuf); } } else { GST_LOG_OBJECT (dvdlpcmdec, "Creating single sub-buffer off %d, len %" G_GSIZE_FORMAT, off, size - off); subbuf = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, off, size - off); GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf); ret = dvdlpcmdec->base_chain (pad, parent, subbuf); } done: gst_buffer_unref (buf); return ret; /* ERRORS */ too_small: { /* Buffer is too small */ GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE, ("Invalid data found parsing LPCM packet"), ("LPCM packet was too small. Dropping")); ret = GST_FLOW_OK; goto done; } invalid_data: { GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE, ("Invalid data found parsing LPCM packet"), ("LPCM packet contained invalid first access. Dropping")); ret = GST_FLOW_OK; goto done; } bad_first_access: { GST_WARNING_OBJECT (pad, "Bad first_access parameter in buffer"); GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, DECODE, (NULL), ("first_access parameter out of range: bad buffer from demuxer")); ret = GST_FLOW_ERROR; goto done; } } static GstFlowReturn gst_dvdlpcmdec_parse_dvd (GstDvdLpcmDec * dvdlpcmdec, GstAdapter * adapter, gint * offset, gint * len) { guint32 header; const guint8 *data; data = (const guint8 *) gst_adapter_map (adapter, 3); if (!data) goto too_small; /* Don't keep the 'frame number' low 5 bits of the first byte */ header = ((data[0] & 0xC0) << 16) | (data[1] << 8) | data[2]; gst_adapter_unmap (adapter); /* see if we have a new header */ if (header != dvdlpcmdec->header) { parse_header (dvdlpcmdec, header); if (!gst_dvdlpcmdec_set_output_format (dvdlpcmdec)) goto negotiation_failed; dvdlpcmdec->header = header; } *offset = 3; *len = gst_adapter_available (adapter) - 3; return GST_FLOW_OK; /* ERRORS */ too_small: { /* Buffer is too small */ GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE, ("Invalid data found parsing LPCM packet"), ("LPCM packet was too small. Dropping")); *offset = gst_adapter_available (adapter); return GST_FLOW_EOS; } negotiation_failed: { GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL), ("Failed to configure output format")); return GST_FLOW_NOT_NEGOTIATED; } } static GstFlowReturn gst_dvdlpcmdec_parse_bluray (GstDvdLpcmDec * dvdlpcmdec, GstAdapter * adapter, gint * offset, gint * len) { guint32 header; const guint8 *data; guint8 channel_indicator; data = (const guint8 *) gst_adapter_map (adapter, 4); if (!data) goto too_small; header = GST_READ_UINT32_BE (data); gst_adapter_unmap (adapter); /* see if we have a new header */ if (header != dvdlpcmdec->header) { GstAudioFormat format; gint rate, channels; switch ((header >> 6) & 0x3) { case 0x1: format = GST_AUDIO_FORMAT_S16BE; dvdlpcmdec->width = 16; break; case 0x2: format = GST_AUDIO_FORMAT_S24BE; dvdlpcmdec->width = 20; break; case 0x3: format = GST_AUDIO_FORMAT_S24BE; dvdlpcmdec->width = 24; break; default: format = GST_AUDIO_FORMAT_UNKNOWN; dvdlpcmdec->width = 0; GST_WARNING ("Invalid sample depth!"); break; } switch ((header >> 8) & 0xf) { case 0x1: rate = 48000; break; case 0x4: rate = 96000; break; case 0x5: rate = 192000; break; default: rate = 0; GST_WARNING ("Invalid audio sampling frequency!"); break; } channel_indicator = (header >> 12) & 0xf; switch (channel_indicator) { case 0x1: channels = 1; break; case 0x3: channels = 2; break; case 0x4: case 0x5: channels = 3; break; case 0x6: case 0x7: channels = 4; break; case 0x8: channels = 5; break; case 0x9: channels = 6; break; case 0xa: channels = 7; break; case 0xb: channels = 8; break; default: channels = 0; GST_WARNING ("Invalid number of audio channels!"); goto negotiation_failed; } GST_DEBUG_OBJECT (dvdlpcmdec, "got channels %d rate %d format %s", channels, rate, gst_audio_format_to_string (format)); gst_dvdlpcmdec_update_audio_formats (dvdlpcmdec, channels, rate, format, channel_indicator, bluray_channel_positions); if (!gst_dvdlpcmdec_set_output_format (dvdlpcmdec)) goto negotiation_failed; dvdlpcmdec->header = header; } *offset = 4; *len = gst_adapter_available (adapter) - 4; return GST_FLOW_OK; /* ERRORS */ too_small: { /* Buffer is too small */ GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE, ("Invalid data found parsing LPCM packet"), ("LPCM packet was too small. Dropping")); *offset = gst_adapter_available (adapter); return GST_FLOW_EOS; } negotiation_failed: { GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL), ("Failed to configure output format")); return GST_FLOW_NOT_NEGOTIATED; } } static GstFlowReturn gst_dvdlpcmdec_parse_1394 (GstDvdLpcmDec * dvdlpcmdec, GstAdapter * adapter, gint * offset, gint * len) { guint32 header; const guint8 *data; data = (const guint8 *) gst_adapter_map (adapter, 4); if (!data) goto too_small; header = GST_READ_UINT32_BE (data); gst_adapter_unmap (adapter); /* see if we have a new header */ if (header != dvdlpcmdec->header) { GstAudioFormat format; gint rate, channels; if (header >> 24 != 0xa0) goto invalid_data; switch ((header >> 6) & 0x3) { case 0x0: format = GST_AUDIO_FORMAT_S16BE; dvdlpcmdec->width = 16; break; default: format = GST_AUDIO_FORMAT_UNKNOWN; dvdlpcmdec->width = 0; GST_WARNING ("Invalid quantization word length!"); break; } switch ((header >> 3) & 0x7) { case 0x1: rate = 44100; break; case 0x2: rate = 48000; break; default: rate = 0; GST_WARNING ("Invalid audio sampling frequency!"); break; } switch (header & 0x7) { case 0x0: /* 2 channels dual-mono */ case 0x1: /* 2 channles stereo */ channels = 2; break; default: channels = 0; GST_WARNING ("Invalid number of audio channels!"); goto negotiation_failed; } gst_dvdlpcmdec_update_audio_formats (dvdlpcmdec, channels, rate, format, channels - 1, channel_positions); if (!gst_dvdlpcmdec_set_output_format (dvdlpcmdec)) goto negotiation_failed; dvdlpcmdec->header = header; } *offset = 4; *len = gst_adapter_available (adapter) - 4; return GST_FLOW_OK; /* ERRORS */ too_small: { /* Buffer is too small */ GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE, ("Invalid data found parsing LPCM packet"), ("LPCM packet was too small. Dropping")); *offset = gst_adapter_available (adapter); return GST_FLOW_EOS; } invalid_data: { GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE, ("Invalid data found parsing LPCM packet"), ("LPCM packet contains invalid sub_stream_id.")); return GST_FLOW_ERROR; } negotiation_failed: { GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL), ("Failed to configure output format")); return GST_FLOW_NOT_NEGOTIATED; } } static GstFlowReturn gst_dvdlpcmdec_parse (GstAudioDecoder * bdec, GstAdapter * adapter, gint * offset, gint * len) { GstDvdLpcmDec *dvdlpcmdec = GST_DVDLPCMDEC (bdec); switch (dvdlpcmdec->mode) { case GST_LPCM_UNKNOWN: return GST_FLOW_NOT_NEGOTIATED; case GST_LPCM_RAW: *offset = 0; *len = gst_adapter_available (adapter); return GST_FLOW_OK; case GST_LPCM_DVD: return gst_dvdlpcmdec_parse_dvd (dvdlpcmdec, adapter, offset, len); case GST_LPCM_1394: return gst_dvdlpcmdec_parse_1394 (dvdlpcmdec, adapter, offset, len); case GST_LPCM_BLURAY: return gst_dvdlpcmdec_parse_bluray (dvdlpcmdec, adapter, offset, len); } return GST_FLOW_ERROR; } static GstFlowReturn gst_dvdlpcmdec_handle_frame (GstAudioDecoder * bdec, GstBuffer * buf) { GstDvdLpcmDec *dvdlpcmdec = GST_DVDLPCMDEC (bdec); gsize size; GstFlowReturn ret; guint samples = 0; gint rate, channels; /* no fancy draining */ if (G_UNLIKELY (!buf)) return GST_FLOW_OK; size = gst_buffer_get_size (buf); GST_LOG_OBJECT (dvdlpcmdec, "got buffer %p of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT, buf, size, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf))); rate = GST_AUDIO_INFO_RATE (&dvdlpcmdec->info); channels = GST_AUDIO_INFO_CHANNELS (&dvdlpcmdec->info); if (rate == 0) goto not_negotiated; /* We don't currently do anything at all regarding emphasis, mute or * dynamic_range - I'm not sure what they're for */ switch (dvdlpcmdec->width) { case 16: { /* We can just pass 16-bits straight through intact, once we set * appropriate things on the buffer */ samples = size / channels / 2; if (samples < 1) goto drop; gst_buffer_ref (buf); break; } case 20: { /* Allocate a new buffer and copy 20-bit width to 24-bit */ gint64 samples = size * 8 / 20; gint64 count = size / 10; gint64 i; GstMapInfo srcmap, destmap; guint8 *src; guint8 *dest; GstBuffer *outbuf; if (samples < 1) goto drop; outbuf = gst_buffer_new_allocate (NULL, samples * 3, NULL); gst_buffer_copy_into (outbuf, buf, GST_BUFFER_COPY_TIMESTAMPS, 0, -1); /* adjust samples so we can calc the new timestamp */ samples = samples / channels; gst_buffer_map (buf, &srcmap, GST_MAP_READ); gst_buffer_map (outbuf, &destmap, GST_MAP_WRITE); src = srcmap.data; dest = destmap.data; /* Copy 20-bit LPCM format to 24-bit buffers, with 0x00 in the lowest * nibble. Note that the first 2 bytes are already correct */ for (i = 0; i < count; i++) { dest[0] = src[0]; dest[1] = src[1]; dest[2] = src[8] & 0xf0; dest[3] = src[2]; dest[4] = src[3]; dest[5] = (src[8] & 0x0f) << 4; dest[6] = src[4]; dest[7] = src[5]; dest[8] = src[9] & 0x0f; dest[9] = src[6]; dest[10] = src[7]; dest[11] = (src[9] & 0x0f) << 4; src += 10; dest += 12; } gst_buffer_unmap (outbuf, &destmap); gst_buffer_unmap (buf, &srcmap); buf = outbuf; break; } case 24: { /* Rearrange 24-bit LPCM format in-place. Note that the first 2 * and last byte are already correct */ guint count = size / 12; gint i; GstMapInfo srcmap, destmap; guint8 *src, *dest; GstBuffer *outbuf; samples = size / channels / 3; if (samples < 1) goto drop; outbuf = gst_buffer_new_allocate (NULL, size, NULL); gst_buffer_copy_into (outbuf, buf, GST_BUFFER_COPY_TIMESTAMPS, 0, -1); gst_buffer_map (buf, &srcmap, GST_MAP_READ); gst_buffer_map (outbuf, &destmap, GST_MAP_READWRITE); src = srcmap.data; dest = destmap.data; for (i = 0; i < count; i++) { dest[0] = src[0]; dest[1] = src[1]; dest[11] = src[11]; dest[10] = src[7]; dest[7] = src[5]; dest[5] = src[9]; dest[9] = src[6]; dest[6] = src[4]; dest[4] = src[3]; dest[3] = src[2]; dest[2] = src[8]; dest[8] = src[10]; src += 12; dest += 12; } gst_buffer_unmap (outbuf, &destmap); gst_buffer_unmap (buf, &srcmap); buf = outbuf; break; } default: goto invalid_width; } if (dvdlpcmdec->lpcm_layout) { buf = gst_buffer_make_writable (buf); gst_audio_buffer_reorder_channels (buf, dvdlpcmdec->info.finfo->format, dvdlpcmdec->info.channels, dvdlpcmdec->lpcm_layout, dvdlpcmdec->info.position); } ret = gst_audio_decoder_finish_frame (bdec, buf, 1); done: return ret; /* ERRORS */ drop: { GST_DEBUG_OBJECT (dvdlpcmdec, "Buffer of size %" G_GSIZE_FORMAT " is too small. Dropping", size); ret = GST_FLOW_OK; goto done; } not_negotiated: { GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL), ("Buffer pushed before negotiation")); ret = GST_FLOW_NOT_NEGOTIATED; goto done; } invalid_width: { GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, WRONG_TYPE, (NULL), ("Invalid sample width configured")); ret = GST_FLOW_NOT_NEGOTIATED; goto done; } } static gboolean plugin_init (GstPlugin * plugin) { if (!gst_element_register (plugin, "dvdlpcmdec", GST_RANK_PRIMARY, GST_TYPE_DVDLPCMDEC)) { return FALSE; } return TRUE; } GST_PLUGIN_DEFINE (GST_VERSION_MAJOR, GST_VERSION_MINOR, dvdlpcmdec, "Decode DVD LPCM frames into standard PCM", plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);